https://www.danreichart.com/news daily 1.0 2019-07-29 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1548003196104-JRL189DNMAKMOHSC8OR7/d1.gif Recent News https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1547403825026-9XSMJZKVO0AJTCH8GEZI/me.jpg Recent News https://www.danreichart.com/biography daily 0.75 2019-02-11 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1547937761552-OR70N8DNFV5G5I5ZSCSC/basketball.jpg Short Biography https://www.danreichart.com/skynet daily 0.75 2019-02-11 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1548006197492-BPT1KYLUJXAB310A58U6/237108472_Nm4Cp-O.jpg Skynet and PROMPT https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549519224971-Q7CTYOIAGV01RQSDOFHN/chariklo_3.png Skynet and PROMPT Skynet telescopes can be sequenced such that one, or multiple, telescopes expose while others read out and save, permitting high-cadence observing without data gaps. This has proven particularly useful for occultation observations. PROMPT observations from May 4, 2013, in combination with observations from other sites, were used to measure the temperature profile of Pluto’s atmosphere. PROMPT observations from June 3, 2013 (center chord, left), again in combination with observations from other sites, resulted in the discovery of two rings around the Centaur Chariklo. https://www.danreichart.com/polarimeter daily 0.75 2019-02-11 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1548124364180-MQPLBGOJVGCB5CBP65F7/polarimeter-1.png PROMPT Polarimeter https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1548476129317-9L4D7563B1P9SJCF90U6/b3.jpg PROMPT Polarimeter Graduate student Justin Moore and the 24-inch diameter PROMPT-8 telescope at Cerro Tololo Inter-American Observatory, Chile. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1548124710001-7AZBU4FASLO8VXTDAWM4/polarimeter-2.png PROMPT Polarimeter The Skynet/PROMPT polarimeter consists of two rotating half-wave plate/beam-splitter cube assemblies (V- and I-optimized, respectively) on a linear actuator so either can be moved into the optical path, and two cameras that simultaneously image the resulting orthogonal polarizations through a set sequence of wave-plate rotation angles. This instrument will be used to measure the polarizations of gamma-ray burst afterglows more rapidly than has been achieved to date, within tens of seconds of spacecraft detection, when some afterglows are expected to be significantly polarized (and simultaneously significantly bright). https://www.danreichart.com/gwcounterparts daily 0.75 2019-02-11 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1548176046214-2RLJEO8X7JDYLDXEDDR2/prompt-ath.jpg Gravitational-Wave Counterparts https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1548176653553-2SYIAB5FIKBWMBJ59XBO/nsf_aag_18_fig3.png Gravitational-Wave Counterparts DLT40 discovery of the first optical counterpart to a gravitational-wave event. From left to right: Last non-detection, discovery image, and difference image. DLT40 was the second of six groups to co-discover the kilonova, associated with GW 170817. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1548424980384-MHPD78JHW8N7HXWPXZAW/meincanada.jpg Gravitational-Wave Counterparts Construction of PROMPT-Athabasca in mid-latitude Alberta, Canada. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1548265719366-MVYWZVPHUF0BIIBKPJBJ/dlt40.png Gravitational-Wave Counterparts Absolute magnitude reached for a survey of depth V = 19 mag as a function of distance. The DLT40 SN search extends to 40 Mpc; DLT40+ GW searches will extend to 65 Mpc, corresponding to 4.3 times the volume. The peak absolute magnitude of the kilonova associated with GW 170817 is shown in red. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549242373848-9Z3W7VURANV6EIGL6B8W/combined_plan.png Gravitational-Wave Counterparts Combined observing plan. LIGO/Virgo localization and updates, Evryscope candidates (especially those proximal to galaxies in the (3D) LIGO/Virgo localization), and ultimately DLT40 imaging are used to identify the counterpart quickly and automatically. Non-DLT40 Skynet telescopes will additionally collect low-density, unfiltered observations pre-identification, and Skynet’s Campaign Manager will semi-autonomously collect high-density, multi-wavelength light curves post-identification. For southern-hemisphere targets, SOAR will additionally collect spectra post-identification. Dashed arrows are for manual operations. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1548176746947-6HRMHNZTQU8NJR93MWVH/nsf_aag_18_fig10.png Gravitational-Wave Counterparts The densely sampled, X-ray, optical (including many Skynet/PROMPT observations), and NIR light curve of long-duration GRB 080710, and an example (but not yet formally fitted) off-axis, structured-jet model, at ≈10^16 Hz. In this particular model, the jet has a nearly classical profile, but is viewed 6º off axis. The model flux is obtained by integrating over the 3D emitting region, for each desired equal-arrival-time surface. The full model includes spectral evolution, such as synchrotron cooling. Although GRB 080710 is not an sGRB, we will use these data to determine what can be inferred, how accurately it can be inferred, correlations between fitted parameter values, and dependences on model assumptions (such as the density distribution of the external medium, energy injection, etc.), as fewer and fewer measurements are fitted to. https://www.danreichart.com/afterglow daily 0.75 2019-02-10 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1548906715740-4I9SAWN73WEVB1LRRH9D/afterglow1a.png Afterglow https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1548906618029-XWF7WATE91JUAZNTJB8H/movie1.gif Afterglow Afterglow 1.0’s aligning and movie-making capabilities are used to animate images of Jupiter. Both its red spot and a shadow of one of its moons can be seen. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1548908278288-UDI20NWB75P1BYSRIA54/eris.png Afterglow Afterglow 1.0’s marking and labeling capabilities are used to help identity Eris in a student’s image (left), compared to an archival, Digitized Sky Survey (DSS) image (right). https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1548908316477-B4OWJ4H6U4EW4BWSK3NE/rrl_lc.png Afterglow Afterglow 1.0’s bulk photometry, light-curve plotting, periodogram, and period-folding capabilities are used to make a period-folded light curve of an RR Lyrae star in globular cluster M28. Students use this to calculate the distance to the cluster. https://www.danreichart.com/radio daily 0.75 2019-02-11 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549031439246-NS5TCKCC0Q2XYE93PB7W/20m_wide.jpg Radio Skynet https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549031549568-0K9WVLKJF5WO9W7REMR4/20m.jpg Radio Skynet Skynet’s 20-meter diameter radio telescope at Green Bank Observatory, West Virginia. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549031131864-2IB9BA4MT6J5DUYYG0CU/20m_conference.jpg Radio Skynet Attendees of the first workshop for science and education with Skynet. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549158510053-SOE7UTQ8MSNCI6GN93RO/rtsre2018_radio_2.png Radio Skynet Left: Raw map of Virgo A (top), 3C 270 (center right), and 3C 273 (bottom), acquired with the 20-meter in L band, using a 1/10-beamwidth horizontal raster. Left and right linear polarization channels have been summed, partially symmetrizing the beam pattern. All three signal contaminants are demonstrated: (1) en-route drift, the low-level variations along the horizontal scans, (2) RFI, both long-duration, during the scan that passes through 3C 273, and short-duration, near Virgo A, and (3) elevation-dependent signal, toward the upper right, which was only ≈11º above the horizon. Middle: After background subtraction, with a 7-beamwidth scales (the map is 24 beamwidths across). Hyperbolic-arcsine scaling is used to emphasize fainter structures. Right: After RFI subtraction, with a 0.9-beamwidth scale. RFI, both long-duration intersecting 3C 273 and short-duration near Virgo A, as well as en-route drift across the entire image, are successfully eliminated. Locally modeled surface haa been applied for visualization, with a minimum weighting scale of 2/3 beamwidths. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549158597228-KDB2VPUL5U5LX497IAFM/rtsre2018_radio_3.png Radio Skynet Top left: (Time-delay corrected) raw maps of Andromeda, acquired with GBO’s 40-foot diameter radio telescope in L band, using a maximum slew speed nodding pattern. Instrumental signal drift dominates each map. Bottom left: Data from the top row background-subtracted, with a 5-beamwidth scale (larger than the minimum recommended scale, given the size of the source). Similar maps are extracted, despite the large systematics. Right: After appending and then jointly RFI-subtracting, with a 0.7-beamwidth scale. Locally modeled surface has been applied for visualization, with a minimum weighting scale of 1/3 beamwidths. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549158766362-2Z3YS9VZFO5HZP6VQZU3/rtsre2018_radio_4.png Radio Skynet Left: Background-subtracted mapping of, from right to left, 3C 84, NRAO 1560/1650, 3C 111, 3C 123, 3C 139.1, and 3C 147, as well as fainter sources, acquired with the 40-foot in L band, using a maximum slew speed nodding pattern. The data are heavily contaminated by linearly polarized, broadband RFI, affecting only one of the receiver’s two polarization channels. Middle: Data from the left panel time-delay corrected and RFI-subtracted, with a 0.7-beamwidth scale. Right: Identically processed data from the receiver’s other, relatively uncontaminated polarization channel, for comparison. The RFI-subtraction algorithm is not perfect, but performs very well given the original, extreme level of contamination. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549159032167-QGI6V2WNEL00ZAA7OI39/rtsre2018_radio_1.png Radio Skynet Top: On-the-fly mapping patterns: horizontal raster (left), nodding (middle), and daisy (right). Bottom: Weighted modeling of 20-meter data from the horizontal raster mapping of Virgo A from above, at two representative points. Modeled surfaces span two beamwidths, but are most strongly weighted to fit the data over only the central, typically, 1/3 – 2/3 beamwidths. Only the central point (red) is retained. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549158844158-KKJ8SXYHRL0SVYB99GB8/rtsre2018_radio_2b.png Radio Skynet Bottom right: Mapping of Virgo A from above processed in Galactic coordinates, vs. its original, equatorial coordinate system. This field is at high Galactic latitude, and consequently serves as a good example of the equal-areas and equal-distances properties of our sinusoidal projection. Equal areas means that sources cover the same number of pixels, and consequently should yield approximately the same photometry: The three sources in this map yields the same photometry as in the bottom-left panel to within 3%, despite the greater (diagonal) distortion that these sources can experience at high Galactic latitudes. Equal distances refers to distances along horizontal lines, as well as along the central vertical axis, being distortion-free. https://www.danreichart.com/statistics daily 0.75 2019-02-11 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549204861389-MUP2F8YT8DO9RR7AKXYC/stat0.PNG New Statistical Techniques https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549207921734-4KUZ4KQBFQCDGS4EBVN3/stat2.PNG New Statistical Techniques Illustration of the geometry of the TRK statistic. Data point centroid is at (x_n, y_n) (point O), with convolved widths (Sigma_{x,n},Sigma_{y,n}). Model curve y_c(x; theta_m) is tangent to the convolved error ellipse at tangent point (x_{t,n}, y_{t,n}) (point T). Red line is the linear approximation of the model curve, with slope m_{t,n} = tan theta_{t,n}. Blue line indicates the direction du_n of path integration for the TRK statistic, perpendicular to the segment OT. TRK is geometrically equivalent to a 1D chi^2-like statistic measured in the direction of the tangent point. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549208433547-IS2A7JDD17VE3GN9CJQG/stat3.png New Statistical Techniques Left: Linear fits to a slop-dominated Gaussian random cloud of N = 100 points with zero intrinsic error bars. Point coordinates generated with zero mean, sigma = 1 Gaussian random variables in both dimensions. Solid red line shows fit with D05 statistic; dotted red line is fit with inverted D05* statistic. Blue line shows fit and inverted fit with TRK statistic; for an invertible statistic, the two are the same. Right: Histogram of fitted slope theta for an ensemble of 1000 zero-mean, sigma = 1 Gaussian random clouds of N = 100 points each, for both D05 and TRK statistics. Solid lines indicate expected theoretical distribution. For TRK, p(theta) is a constant; for D05, p(theta) is biased towards theta = 0 by a factor (cos theta)^N. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549209131269-GCOSD67JAVPCZTWSUMWO/stat4.png New Statistical Techniques Left: Linear fits to slop-dominated data. Data points generated by adding independent zero-mean Gaussian random variables with standard deviation sigma_x = sigma_y = 0.5 to N = 100 points randomly distributed between (-1,-1) and (1, 1) along the line y_c(x) = x. Data points are assigned zero intrinsic uncertainties sigma_{x,n) = sigma_{y,n} = 0. Dash-dotted lines: uninverted D05 fit/TRK fit as scale s goes to 0 (shallow line), and inverted D05* fit/TRK fit as scale s goes to 1 (steeper line). Solid blue line: TRK fit at optimum scale. Right: Linear fits to data with both slop and intrinsic uncertainties. The coordinates of each point are the same as on the left. Each point was assigned symmetric intrinsic uncertainties sigma_{x,n) = sigma_{y,n} = 0.25. Dotted red lines: uninverted D05 fit (shallow line), and inverted D05* fit (steeper line); these fits are identical to those on the left. Dashed blue lines: TRK fits at scale s_{min} at which fitted slop sigma_x goes to 0 (shallower line), and at scale s_{max} at which slop sigma_y goes to 0 (steeper line). Solid blue line: TRK fit at optimum scale. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549213477784-7FTEL4MAB2X722TODD3S/rcr1.png New Statistical Techniques Left: 1000 measurements, with fraction f_1 = 1 - f_2 drawn from a Gaussian distribution of mean mu_1 = 0 and standard deviation sigma_1 = 1, and fraction f_2 = 0.15 (top) and 0.85 (bottom), representing contaminated measurements, drawn from the positive side of a Gaussian distribution of mean mu_2 = 0 and standard deviation simga_2 = 10, and added to uncontaminated measurements, drawn as above. Mode (black line) and 68.3-percentile deviations, measured both below and above the mode, using technique 1 from §2.2 (red lines), using technique 2 from §2.2 (green lines), and using technique 3 from §2.2 (blue lines). The mode performs better than the median or the mean, especially in the limit of large f_2. The 68.3-percentile deviation performs better when paired with the mode, and when measured in the opposite direction as the contaminants. Right: After iterated Chauvenet rejection, using the smaller of the below- and above-measured 68.3-percentile deviations, in this case as measured by technique 1 from §2.2. Techniques 2 and 3 from §2.2 yield similar post-rejection samples and mu and sigma measurements. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549213986340-PF6ZMW6F8YZG6POX8CTP/fig28_dense.png New Statistical Techniques Flowchart of our algorithm, without bulk pre-rejection (see Figure 30). The most discrepant outlier is rejected each iteration, and one iterates until no outliers remain before moving on to the next step. mu and sigma (or sigma_- and sigma_+, depending on whether the uncontaminated distribution is symmetric or asymmetric, and on the contaminant type; Figure 19) are recalculated after each iteration, and the latter is multiplied by the appropriate correction factor (see Figure 29) before being used to reject the next outlier. mu and sigma (or sigma_- and sigma_+) may be calculated in different ways in different steps, but how they are used to reject outliers depends on whether the uncontaminated distribution is symmetric or asymmetric, and on the contaminant type, and consequently does not change from step to step (Figure 19). https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549218263097-N472GHHU1YIJV5DQ6HCH/stat5.png New Statistical Techniques Left: Equally weighted measurements, drawn from a Gaussian distribution of mean y(x) = x and standard deviation 1, where half of the measurements have been contaminated, in the positive direction. Right: Model solutions, calculated from each pair of measurements in the left panel, for the model y(x) = b + m(x - xbar), where xbar = (Sum_i^N w_ix_i) / (Sum_i^N w_i) = (Sum_i^N w_ix_i) / N ≈ 0. Each calculated parameter value is weighted, as prescribed in §2.1, and darker points correspond to model solutions where the combination of these weights, (w_b^{-1} + w_m^{-1})^{-1}, is in the top 50%. The purple circle corresponds to the original, underlying model, and in both panels, red, green, and blue correspond to the weighted mean, median, and mode, respectively, of the calculated parameter values, as defined in §2 and §3. Red also corresponds to least-squares regression, applied to the measurements in the left panel (see §2). The weighted mode performs the best. The weighted mean/least-squares regression performs the worst. https://www.danreichart.com/team daily 0.75 2019-02-11 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549233183217-2HVV9WHA2CL8Q1ITCU6Y/team1.jpg R & D Team https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549230606165-N2Y7J4D91966JFH1B5XC/haislip.jpg R & D Team https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549231493574-TJ3K0I5N1X6EN7MJPZBD/kouprianov.jpg R & D Team https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549232613320-LCWXAZ6QG1WRVSGTQO7A/dutton.jpg R & D Team https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549240573443-JK9RP0LFIHPLBR8FPS5O/frank.png R & D Team https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549240210065-V6LZH5QSR95FP20JEQ4S/roark.jpg R & D Team https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549238032920-0Y656D2DTKZUDCP1TKA1/konz.jpg R & D Team https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549240227323-ZCMIWSA8ACDJALVBOQ19/xu.png R & D Team https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549238066602-40MCULJQNLCGK8PT2C6M/trotter.jpg R & D Team https://www.danreichart.com/erira daily 0.75 2026-03-14 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549252718341-ZVLABXWOYV9IHVL600BF/erira3.jpg ERIRA https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549254017640-XRVVYQXXV90RSCPJU2ZH/erira6.jpg ERIRA GBO’s fully manual 40-foot diameter teaching radio telescope. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549252440445-EGXGD8I7WUTRDGT2FLUC/erira_2.jpg ERIRA Students taking a break at the historic Jansky antenna on Reichart’s “Famous Backwards Walking Tour”. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549260740459-X32NKNKAX0XKJYA1NQKB/20m.jpg ERIRA GBO’s 20-meter diameter research-grade radio telescope, which was fully automated in partnership with UNC-Chapel Hill in 2013. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549258077243-29CDIOJLKX7EVVULSRPL/erira15.jpg ERIRA Crunch night, before final presentations the next day. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549254351694-MCR8L4Y4PBITXJIP0CB6/40ft_sick.jpg ERIRA The 40-foot diameter telescope, up close https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549257362576-GD3QL8RA0ZKLL0340DFD/erira9.jpg ERIRA Students observing with the 40-foot, from inside “Bunker 40” https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549254554843-HGUZDH8QIPOI01YOPRWW/20m_wide.jpg ERIRA The 20-meter diameter telescope is on the right https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549254273369-VZHNRY5IZZH522HGYNSI/erira_1.jpg ERIRA Students learning how to use “Radio Cartographer”, which they use to map the invisible sky https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549257375888-3WCRRIL7RTLYAZGEXNYK/erira11.jpg ERIRA Processing collected data, in the Science Center https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549257377841-G3HFK4KCIF6YXI70VIY6/erira12.jpg ERIRA The Green Bank Telescope https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549257374972-4P0E4NX9N3V0K7I03Z1B/erira10.jpg ERIRA Students participating in a workshop on SETI, in the Drake Lounge https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549254327130-ABCCT8QVUVTNB8MUVNBM/erira_5.jpg ERIRA Before a group hike https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549257392786-X3I1WHERR1P9IRCAW5BR/erira14.jpg ERIRA Photo day, at the 40-foot https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549254309007-XGHKN15TUGEV4V3CVIHP/erira_4.jpg ERIRA Group photo, at the Science Center https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549387934609-UCJ2Z2XX8G0RW05MYVI7/erira_a.jpg ERIRA Final presentations, in the Drake Lounge https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549257395644-QWUWSKAJFYG8GO9OZKC3/erira16.jpg ERIRA End-of-week movie night, with Reichart’s “Heart-Attack Popcorn” https://www.danreichart.com/application daily 0.75 2026-03-14 https://www.danreichart.com/curricula daily 0.75 2019-02-11 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549468117091-G2SXQIEQNO5SGR4HL9FK/skynet2.jpg Skynet-Based Curricula https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549481845973-2BVM7QTTZVHXU9OXKO02/image-asset.jpeg Skynet-Based Curricula Mosaic of images of NEO 2001 FE90 obtained simultaneously from Skynet telescopes at Cerro Tololo Inter-American Observatory in Chile and Dark Sky Observatory in North Carolina. A parallactic shift of ≈8’ and a rotational period of ≈30 minutes can be measured from the images. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549482050541-JBI607UNS5U4I8GVW29N/skynet6.gif Skynet-Based Curricula OPIS! is a series of eight, interconnected labs that teach the evolution of our understanding of Earth’s place in the universe, and the cosmic distance ladder. Lab 6 makes use of what was learned in Lab 5 to teach the Great Debate. In Lab 7, students will use Skynet to collect 21-cm spectroscopy from Green Bank Observatory’s (GBO’s) 20-meter diameter radio telescope to measure the Galaxy’s rotation curve and mass distribution; currently archival data from GBO’s 40-foot diameter telescope are used. A ninth, capstone experience on multi-messenger astronomy has been proposed to NSF, in which students will use Skynet to collect comparison images to identify the optical counterpart to a gravitational-wave (GW) event, and then use the GW event as a standard siren, and a provided spectrum of the counterpart, to measure Hubble’s Constant (Skynet was the second of six groups to co-discover the first optical counterpart to a GW event.) https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549482092587-IXNHIRMQHNDLV5YBAF2K/skynet8.png Skynet-Based Curricula UNC-Chapel Hill’s astronomy-track majors and minors recruitment and retention pyramid, which has resulted in an ≈300% increase in majors and minors since our introduction of OPIS! and ERIRA. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549482268549-9H8JCL0QO18CS9V0VT68/cena3.PNG Skynet-Based Curricula Centaurus A: PROMPT image (left) and GBO 20-meter X-band image (right). This capstone experience pairs regular field-of-view optical imaging with the 20-meter’s greater resolution (≈0.12°) in X band, to explore different facets of this unusual (and nearby/bright) object. Consisting of an elliptical galaxy that recently merged with a smaller spiral galaxy, the influx of new gas resulted in a burst of star formation. Students will image in LRGB (old and new stellar populations, dust lanes) and H-alpha (new star-forming regions), and in HI (cool gas) using the 20-meter in L band. The elliptical also features a 55-million-solar-mass black hole, which is now active, producing galaxy-scale jets (synchrotron emission), which the 20-meter can (at least partially) resolve in X band. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549494460153-R98CWY8X0HQGIASJ9UIF/skynet12.jpg Skynet-Based Curricula IDATA students and educators. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549515823552-Z74MBAL8WY9MOQKY6PUB/skynet11.jpg Skynet-Based Curricula IDATA student demonstrating Afterglow 2.0, also called “Afterglow Access”, for its accessibility features. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549471027377-4C91382W9WM7GPNNDIFB/skynet1.jpg Skynet-Based Curricula Skynet Junior Scholars using Afterglow 1.0. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549482737793-I3QVJOKURQBXOX9CYP81/skynet4.jpg Skynet-Based Curricula SJS educators, training at Green Bank Observatory, in West Virginia. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549516122749-PY7PNQ6YN9DQFNTKMDN5/556.JPG Skynet-Based Curricula Morehead Planetarium and Science Center at the University of North Carolina at Chapel Hill. https://www.danreichart.com/introastro daily 0.75 2019-02-22 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1549907911022-IGE9Z7PDWOIS8ILXOUTW/lab4_proc_a_02.gif Project Intro Astro https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550615915621-M2KWFDLNC36A9E5G4IO2/ASTRO+101+cover.png Project Intro Astro https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550615922267-AWI8K6U600KDVIIRJHFP/TSO+cover.png Project Intro Astro https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550615915428-SRET11KE5HYITW5D9CTU/ASTRO+101+w+TSO+cover.png Project Intro Astro https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550615921442-M5O8AR2NU7JM3NT1O0VD/ASTRO+102+cover.png Project Intro Astro https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550615920082-G9X16CBOMHM2MN87A97H/ASTRO+101L+cover.png Project Intro Astro https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550615924980-EIB6Q9F5XTU9H2XTXOMH/ASTRO+102L+cover.png Project Intro Astro https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550671867947-AH6TJTT3I76W1X7B03N6/epolling.png Project Intro Astro Our freely available, math-oriented e-polling interface. Students enter values using their phones or laptops. Values may be either positive or negative, decimal or fraction, or in scientific notation. All submitted values can be displayed simultaneously, or hidden from the students, as can be a histogram of these values. The histogram can be plotted linearly or logarithmically (useful in the event of exponential outliers), over an instructor-adjustable range. The median of each bin’s value is displayed, and both the number of bins and the displayed precision are also instructor-adjustable. Finally, the interface also supports slow-reveal (for suspense!) class medians (e.g., we use this feature during our interactive lecture on Drake’s Equation). https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550582640747-6F9GDVYSNH6JYT7S4D0O/graph.png Project Intro Astro UNC-Chapel Hill’s introductory astronomy credit hours (primarily ASTRO 101, ASTRO 102, and OPIS!). https://www.danreichart.com/sphere daily 0.75 2019-02-21 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550786852205-0P5HTDCLJZ6Q36FF59ZK/sphere0.jpg Celestial Sphere Lab https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550787156798-WKRRX211C8Q1MVERT1W6/sphere1.jpg Celestial Sphere Lab https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550787162745-W4D17WNRBO3B5JVC0B85/sphere2.jpg Celestial Sphere Lab https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550787171254-KP6S2QAGAXWU7CUNP3M4/sphere3.jpg Celestial Sphere Lab https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550787181273-UYOXZ614PHG6OUQEPIZT/sphere4.jpg Celestial Sphere Lab https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550787190410-5CMJUXSSV0HUNB1WR20T/sphere5.jpg Celestial Sphere Lab https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550787240725-G5S6FKR9DV4FOZOKGMDV/sphere6.jpg Celestial Sphere Lab https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550787298710-VLZYYNKY7Y0I1Q3LJL08/sphere7.jpg Celestial Sphere Lab https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550787302659-350ZEVVJH9YNGY209FHD/sphere8.jpg Celestial Sphere Lab https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550787308027-1AFEJ4CCOROLG1CMMVPW/sphere9.jpg Celestial Sphere Lab https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550787327456-Y22L4OIK2IEHGKC3PXBV/sphere10.jpg Celestial Sphere Lab https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550789265899-WRZPT6P3KKBH57XJWQH7/sphere11.jpg Celestial Sphere Lab https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550789268776-ZSBQSV5GQ8S725YZNQ28/sphere13.jpg Celestial Sphere Lab https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550789372950-G93N6I47M5DGFIPVMXGZ/a2.jpg Celestial Sphere Lab Before removing the radio signatures of the earth, the city of Chicago, and other instrumental effects https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550788792182-HW23ZYP2F484NPAQY1LS/a.jpg Celestial Sphere Lab After: The sun and the 4.5-m telescope's interference pattern https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550789499260-N43T91SRF1G1H20EQQ9L/sphere17.jpg Celestial Sphere Lab The corresponding portion of the sphere https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550789379010-GS2D187DECEDTAPDWMPA/b2.jpg Celestial Sphere Lab Before removing the radio signatures of the earth, the city of Chicago, and other instrumental effects https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550788798021-PU0ZTK1UV6I4G7CJDROL/b.jpg Celestial Sphere Lab After: The Crab Nebula and IC 443 supernova remnants, and the Orion and Rosette Nebulae stellar nurseries https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550789519399-OOSHVJ0S60M9KO0A8U8H/sphere15.jpg Celestial Sphere Lab The corresponding portion of the sphere https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550789385928-DNF8CIWONQKICGX0N0PU/c2.jpg Celestial Sphere Lab Before removing the radio signatures of the earth, the city of Chicago, and other instrumental effects https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550788804426-B9DFJ18HK629E66YFJGX/c.jpg Celestial Sphere Lab After: The moon, the elliptical galaxy Virgo A, the quasar 3C 273, and the North Polar Spur https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550789522870-SIJ14BNJ26T0SSDVW54W/sphere18.jpg Celestial Sphere Lab The corresponding portion of the sphere https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550789395504-8CW2VM4A0HVC15NEN7WG/d2.jpg Celestial Sphere Lab Before removing the radio signatures of the earth, the city of Chicago, and other instrumental effects https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550788813263-WWB7R9XN73A9JWJD3LMO/d.jpg Celestial Sphere Lab After: The Galactic plane near the Galactic center, supernova remnant 3C 400, and the North Polar Spur https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550789526231-B1165P3ZT0PD38RFPR1T/sphere16.jpg Celestial Sphere Lab The corresponding portion of the sphere https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550790075647-1G9D2L4YPYJXQCJCMOWZ/sphere14.jpg Celestial Sphere Lab Completed celestial sphere and three-dimensional radio map of the northern sky https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550790079582-CTO1HMRUXRI891631XAG/sphere12.jpg Celestial Sphere Lab The Space Explorers in front of their completed celestial sphere and three-dimensional radio map of the northern sky https://www.danreichart.com/stonehenge daily 0.75 2019-02-26 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550988565308-JWMS4UY579HGAG800QL1/sh7.jpg Stonehenge Observatory https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550844689226-9U6OG0A4XJEPACT38QH2/sh2.png Stonehenge Observatory The summer solstice sunrise as viewed from the center of Stonehenge's first phase of construction, circa 3100 B.C. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550844742660-Q25CE6X5LEHLVPXMRQ7C/sh3.png Stonehenge Observatory The winter solstice sunset as viewed from atop the lintel opposite to the Great Trilithon of Stonehenge's third phase of construction, circa 2000 B.C. This alignment was not previously known when I first discovered it using The Stonehenge Observatory, in 1996. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550844865291-73UX55JG3IR3FOPLHOQX/sh5.png Stonehenge Observatory The moon over Stonehenge's second phase of construction, circa 2150 B.C. https://www.danreichart.com/talks daily 0.75 2023-10-20 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550876204999-L1PXLIXZQJQPPXF3DLK4/maxresdefault.jpg Public Talks and Courses https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550988249271-JAKRM1FBUDNRF32ONH1L/telescope.jpg Public Talks and Courses One of Skynet’s original, 16-inch diameter PROMPT telescopes at Cerro Tololo Inter-American Observatory in the Chilean Andes. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1551063485377-4AK397UB1BKZWMPTUD9Q/ligo_dlt40.png Public Talks and Courses Skynet/PROMPT/DLT40’s discovery of the first optical counterpart to a gravitational-wave event, caused by the merger of binary neutron stars. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1550988759756-AD6GNO2UAJZXZP1EBVQ4/sh1.png Public Talks and Courses Screenshot from The Stonehenge Observatory: A bird's-eye view of Stonehenge's third phase of construction, circa 2000 B.C. The outlying stones, statistically, are the most astronomically significant. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1551063393825-HQKL8N19D2KAISACO82D/radio_140.jpg Public Talks and Courses The 140-foot diameter radio telescope at Green Bank Observatory, caught during a rare receiver change. Built in the 1960s, the 140-foot is still in use today. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1551119976259-XEK1NBZ755ESEEKIJIKZ/2620bd.JPG Public Talks and Courses The Big Bang was not an explosion in space, but rather an explosion of space. https://www.danreichart.com/morehead daily 0.75 2019-07-14 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1551156812617-S4J7HZDEHT4FZDQZ9BF1/transit.jpg Morehead Observatory https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1551152056114-FPRJJQNCWNUL41MEC4RE/557.jpg Morehead Observatory Morehead Observatory’s 24-inch diameter telescope. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1551678032501-CFXEOZ7U2398FOBBQ09P/IMG_2678.JPG Morehead Observatory My wife Lois welcoming Jupiter Ball patrons to the observatory level after dinner and drinks. https://www.danreichart.com/social daily 0.75 2019-04-08 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1551241401813-13D2O1LPAEK7EKS7QVNM/xkcd_20m.jpg Skynet on Social Media https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1552368074755-JYPPSJUWVHLG86SG76IQ/logo_srtn.jpeg Skynet on Social Media This 6-hour observation of the Great Barred Spiral Galaxy (NGC 1365), taken by the Star Shadows Remote Observatory astrophotography group with one of our 16-inch diameter PROMPT telescopes at Cerro Tololo Inter-American Observatory in the Chilean Andes, serves as the logo of our social media sites. This image was selected as NASA’s Astronomy Picture of the Day in 2007. https://www.danreichart.com/radiophoto daily 0.75 2019-03-30 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553189134480-M0YNCQDLU3Y3CGUYGJ7R/orion.png Radio Astrophotography https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553188948266-NV2WNZCTFI0NXI8QL1CM/ha-radio-animated.gif Radio Astrophotography Optical, H-alpha data (black-and-white layer) taken by Steven Christensen and processed by Steven and Tim Christensen. Radio data (false-color layer) taken with Green Bank Observatory’s 20-meter diameter radio telescope, using Skynet (Dan Reichart, John Martin, Dylan Dutton, Michael Maples, Travis Berger, Joshua Haislip, Frank Ghigo). https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553188195837-7T3HE4BY9HNQI8XUQ0ZH/eclipse_radio.png Radio Astrophotography https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553189488667-KKPUGK6AEZ34AKTWFGQB/40ft-pol.png Radio Astrophotography https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553205259594-B7PJMVIUOE07M04FH24F/40ft-cascyg.png Radio Astrophotography https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553488595065-YSL8VNFT6O17OQ7P7DUO/cas.png Radio Astrophotography https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553189773022-YZSO9MS0O9TQTBHOP2AC/40ft-cygnus.png Radio Astrophotography https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553189828337-59RPDEK0AXZR80GRI2Y4/40ft-and.png Radio Astrophotography https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553205602797-KG2J0NLMGLXNEPAUIMH1/ERIRA2012.png Radio Astrophotography https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553195971675-BBTQ8XOI91AXVTSNV6A6/40foot.jpg Radio Astrophotography https://www.danreichart.com/zoomin daily 0.75 2019-03-30 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1551241864945-Z9OEOT94B3WT09CW7HEN/ex1.jpg Zoom In! Exhibit https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553897489028-25W23CNDGO21RDTU88A8/ex2.jpg Zoom In! Exhibit https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553897491450-D51UPQ0MXX95LOXVL4XS/ex3.jpg Zoom In! Exhibit https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553897491495-2D8C2RK38K7PZPID3TDM/ex4.jpg Zoom In! Exhibit https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553897493603-EACEIFP0136E5AB5MAF9/ex5.jpg Zoom In! Exhibit https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553897547241-24VE5QGOUYNI87BKRUD2/ex6.jpg Zoom In! Exhibit https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553897493021-GPXOU8E5E1Q32SRNFH4P/ex7.jpg Zoom In! Exhibit https://www.danreichart.com/astrophoto daily 0.75 2022-08-17 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553093113229-O4XYQ6WY65BCIDID5T5R/100e.jpg PROMPT Astrophotography Me standing next to one of our 16-inch diameter telescopes at Cerro Tololo Inter-American Observatory in the Chilean Andes. SSRO is using an identical scope, but with an upgraded, PlaneWave Instruments Ascension 200HR mount. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1660746767200-SPTRKTZ4GFEXQ1HH3V7K/NGC1532-final3_4096r.jpg PROMPT Astrophotography - Galaxies in the River https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1660746708863-3GVPDJ5XPXQL5YNKEL71/Horsehead_Hanson_2604.jpg PROMPT Astrophotography - The Horsehead Nebula https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553094194293-DFX7YH05HPH27ZWL3OL8/NGC2023master2_1024.jpg PROMPT Astrophotography - NGC 2023 in the Horsehead's Shadow https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553094878926-1N2ZVPL7KS44JGTZGWE9/NGC1316_MazlinKellerMenaker1024d.jpg PROMPT Astrophotography - NGC 1316: After Galaxies Collide https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553095225782-VVWAFZZ146MVVP81XU33/StatLibNeb_Mazlin_960.jpg PROMPT Astrophotography - NGC 3576: The Statue of Liberty Nebula https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553095339250-5SEVXOZ6GU7ODIEHFU6Z/n3169n3166_orig.jpg PROMPT Astrophotography - Unraveling NGC 3169 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553095497476-SGE8VIO8UYZTJNY2OWMF/NGC1097_newmaster3starshadows1024.jpg PROMPT Astrophotography - In the Arms of NGC 1097 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553095598392-6FN8XLESP7MP6XCP4DLL/NGC4945_Master23h600.jpg PROMPT Astrophotography - Nearby Spiral Galaxy NGC 4945 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553095697096-VEKCJ7PHNQ6KJWB7QI0L/ngc7424_ssro_960.jpg PROMPT Astrophotography - Grand Spiral Galaxy NGC 7424 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553095857964-8D6SCYGSV90O99Y0MTC6/NGC5128_starshadows900.jpg PROMPT Astrophotography - Centaurus A https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553098543536-VPGCRPU1TAW136OUH4IE/Lagoon_ssro900.jpg PROMPT Astrophotography - M8: The Lagoon Nebula https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553098601844-G0Q4UHBM8CI8P6SGH68R/n2359Thor_mazlin900.jpg PROMPT Astrophotography - Thor's Helmet https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553098654041-SLO3LMVTUAXA86Y88GNZ/NGC4038_ssro900.jpg PROMPT Astrophotography - The Antennae https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553098727235-0IJ4IPBRNTTPETMRSLQU/NGC253_SSRO_900.jpg PROMPT Astrophotography - NGC 253: Dusty Island Universe https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553098777743-3AQ350RAU92Z4QCNG8HL/NGC1365_master650.jpg PROMPT Astrophotography - NGC 1365: Majestic Island Universe https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553096021093-5WLEPDCNU8EM5CN8VYWB/NGC2442_ssroGoldman720.jpg PROMPT Astrophotography - NGC 2442: Galaxy in Volans https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1660747141571-FQB7F9FG4DKL9QZB2T9U/NGC7814withSN2021rhuChart32.jpg PROMPT Astrophotography - NGC 7814: Little Sombrero with Supernova https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1660746968911-CAYL4FGFYNG3VYUJ7NBI/NGC3242haloChart32.jpg PROMPT Astrophotography - The Ghost of Jupiter's Halo https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553099464194-JPBW67ML0KNL5AIE9IWF/NGC4567_70chart32_1024.jpg PROMPT Astrophotography - Twin Galaxies in Virgo https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553106955993-MEELKJ1P902ZEAIB5TM9/NGC247_70mosSchedler1024.jpg PROMPT Astrophotography - NGC 247 and Friends https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553107015041-PL8PDRX1AK4F5XZ76QUG/NGC7814Chart32_c40.jpg PROMPT Astrophotography - NGC 7814: The Little Sombrero in Pegasus https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553107067202-NDKCQC47YFY4XTWABGV6/NGC660_80Chart32_1024.jpg PROMPT Astrophotography - Polar Ring Galaxy NGC 660 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553107116477-WX4675NP5TKLOHJSRVRR/NGC5566_70chart32_1024c0.jpg PROMPT Astrophotography - Arp 286: Trio in Virgo https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553107158433-QLS7ODNTM60JJPQIKJBY/NGC7214_70_1024c.jpg PROMPT Astrophotography - Hickson 91 in Piscis Austrinus https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1553107200068-D8HIHEXT8UY0PAQR0Z6P/NGC134_70wendel1024.jpg PROMPT Astrophotography - Sculptor Galaxy NGC 134 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Lecture https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1554126665656-EX8FY1WQCXHNMJ39GQNL/last1.jpg Last Lecture https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1554126686184-9NZQ7NSIWFI2YPB756K5/last3.jpg Last Lecture https://www.danreichart.com/tree daily 0.75 2019-11-02 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1551243265337-T8A83MDZBZ2EPENF7WOW/tree.jpg Davie Poplar Tree https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1554520592818-2M242S0ZGX007LX4JNNF/DNqf6g9UEAAASWu.jpg Davie Poplar Tree https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1554520592698-I9J5R0KV4M27VH373KAI/2597204_110217-wtvd-explosion-real-vid.jpg Davie Poplar Tree https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1554518078318-0985FKRJ6FKUBKG89QPW/110217wtvdUNCexplosionimg02.jpg Davie Poplar Tree 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Time Model and Projections https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1588629038120-QAX19CXZPJV9OVZSGWTN/doubling1.png COVID-19 Doubling Time Model and Projections The low, open circles are excluded from the fit because testing was ramping up in the United States during this period, resulting in fewer cases being missed than even the day before. This was of course good news, but it also meant that artificially low doubling times were measured during these days (dashed curve). These measurements also meet Chauvenet’s criterion for being outlying, and consequently are rejectable on purely statistical grounds as well. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1588629054629-MU00V6CN60A2L182MQR9/doubling2.png COVID-19 Doubling Time Model and Projections These projections are similar to what the professionals are finding under different mitigation scenarios. Our projection model is simpler, but has the advantage of assuming nothing. Rather, we are simply extrapolating current changes in behavior, as reflected in the daily doubling-time measurements. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1587838224650-CFT6191ZWJPAMGJOA4A7/doubling3.png COVID-19 Doubling Time Model and Projections The sudden drop corresponds to when the testing ramp-up phase leveled off in late March, which allowed new data to begin to inform our model again. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1587838240667-LEVKW7VUITKK6UEVW8Q2/doubling6.png COVID-19 Doubling Time Model and Projections The uncertainty increased in late March, when we learned of the large, asymptomatic population of carriers. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1588629071528-U6L76I1DKGEZV1QFAWLB/doubling4.png COVID-19 Doubling Time Model and Projections https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1588629087358-FG405T3YIT4CVHFX3842/doubling5.png COVID-19 Doubling Time Model and Projections The sudden drop corresponds to when the testing ramp-up phase leveled off in late March, which allowed new data to begin to inform our model again. https://www.danreichart.com/covid19-reports daily 0.75 2020-09-07 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1584468929971-JD4LL979MCMO4TJV600B/covid19.jpg COVID-19 Reports https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1599492948732-A66NZV09SVNJPU7HAODU/doubling7.png COVID-19 Reports https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1597813019670-EBOZHQNYDTRD40AC660Q/doubling7.png COVID-19 Reports https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1596656183490-GGRERG4CL2LOXGWEGAVL/doubling7.png COVID-19 Reports https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1593662885580-S1DYZQ29QGB434VK77R1/doubling7.png COVID-19 Reports 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https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1669733263255-TKNDNECYREJWDK5EVG1U/m42.fits+%285%29.jpg Afterglow Astrophotography - A https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1669734084191-O71BAF49FF3DJETLAX86/m42.fits+%285a%29.jpg Afterglow Astrophotography - B https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1669734089768-Q5HI2O0GHKQCA9IZUKG4/m42.fits+%285b%29.jpg Afterglow Astrophotography - C https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1669734093991-PBVLTENTJXMF17X0S2DI/m42.fits+%285c%29.jpg Afterglow Astrophotography - D https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/eb88bc85-dd78-4a4f-90fd-c7667958204d/ngc_253.fits+%2828b%29.jpg Afterglow Astrophotography - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1669731959278-HZ9ZLNL5RY0MNF1VX0ZK/ngc_253.fits+%2828%29.jpg Afterglow Astrophotography - A https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1669731969551-FI0SVSKNKMJUWSUEAHPL/ngc_253.fits+%2828a%29.jpg Afterglow Astrophotography - B https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1669731979871-CQR8KVZCI8CP5YFBASVK/ngc_253.fits+%2828b%29.jpg Afterglow Astrophotography - C https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1669731987008-QVV89VHV30CGG1CI65YP/ngc_253.fits+%2828c%29.jpg Afterglow Astrophotography - D https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/2d97077d-261d-47bf-8191-a49490750c23/ngc_1316.fits+%285%29.jpg Afterglow Astrophotography - Make it stand out This is NGC 1316 (also known as Fornax A) and its smaller companion, NGC 1317. 1316 is a lenticular galaxy — something between an elliptical and a spiral. 1317 is a barred spiral. First, I collected 6.6 hours of LRGB data with Skynet's 16-inch diameter PROMPT-6 telescope in Chile, and combined it, correcting for the reddening effects of dust. Then, I supplemented it with mid-infrared data from NASA's Spitzer spacecraft. Here pinker colors highlight warm dust (about 300 Kelvin) and bluer colors highlight cool dust (about 100 Kelvin). Also notice all the pink/purple/blue background points. Each one is a galaxy like these two, with its own warm/cool dust, just much farther way. For the details: https://www.danreichart.com/afterglow-astrophotography/#ngc1316 https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1668356215598-5EOYSJ1PRZ7EFTRYT1SE/ngc_1316.fits+-+group.fits+%280%29.jpg Afterglow Astrophotography - A https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1668363423225-GYGM0U6CAJXNP20NFPEB/ngc_1316.fits+%281%29.jpg Afterglow Astrophotography - B https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1668363428295-PHNGSF9NE6DGDSXPK7WK/ngc_1316.fits+%282%29.jpg Afterglow Astrophotography - C https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1668382032966-UDW1RGJ4LBAAPH5E9H7N/ngc_1316.fits+%283%29.jpg Afterglow Astrophotography - D https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1668382042874-7FNX8W1VOF6FZEQT7UWP/ngc_1316.fits+%284%29.jpg Afterglow Astrophotography - E https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1668383804983-ZU0GP83ELUCVP6QXYKX6/ngc_1316.fits+%285%29.jpg Afterglow Astrophotography - F https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/24a99f81-8d98-43bb-b71c-c1e1e8678ee2/m42.fits+%285%29.jpg Afterglow Astrophotography - Make it stand out I've mostly caught up on my other work, so back to testing our new (and still developing!) astrophotography software (Afterglow Access), for students. This is (of course!) the Great Nebula in Orion, which is so bright you can see it with the naked eye. For this one, I used our 32-inch diameter PROMPT-7 telescope in Chile, and acquired 16 minutes in LRGB + 1.5 hours in narrowband hydrogen (pink) and oxygen (blue-green) filters. To this I added 5.8 micron mid-infrared data from NASA's Spitzer spacecraft (orange), which shows where these stars are heating the surrounding, dusty clouds from which they formed, and 2.2 micron near-infrared data from the ground-based 2MASS survey (blue). These also reveal stars that we otherwise wouldn't be able to see, hidden by this dust at visible wavelengths, but not in the infrared. For the details: https://www.danreichart.com/afterglow-astrophotography/#messier42. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1668278131974-KE26RXRCR6IOXNX9ZJE8/m42.fits+%280%29.jpg Afterglow Astrophotography - A https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1668278137673-BN08KAPK8S22DNJ21K6V/m42.fits+%281%29.jpg Afterglow Astrophotography - B https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1668278143582-HEHGNU9EAPEC2K9B0LRR/m42.fits+%282%29.jpg Afterglow Astrophotography - C https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1668349586044-QXT4N5M97BBIOTV03J9K/m42.fits+%283%29.jpg Afterglow Astrophotography - D https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1668349594593-EGDPVDE800K4VHDJGZF9/m42.fits+%284%29.jpg Afterglow Astrophotography - E https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1668349600313-PSDQTF0H5PSZ76K2F02P/m42.fits+%285%29.jpg Afterglow Astrophotography - F https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/4ba724df-2796-4504-9ddf-2eff3878178d/messier_1.fits+%289%29.jpg Afterglow Astrophotography - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664814397462-R9RQEADL336XIFQEF6OW/messier_1.fits+%281%29.jpg Afterglow Astrophotography - A https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664814401008-QFJBAZYHDAC1ET70B402/messier_1.fits+%282%29.jpg Afterglow Astrophotography - B https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664814405407-H37F5CEI18P7YTHP6BRH/messier_1.fits+%283%29.jpg Afterglow Astrophotography - C https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664814411033-OWIODDPPUJXOGGUJL2GP/messier_1.fits+%284%29.jpg Afterglow Astrophotography - D https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664830910449-NEYLH56JUA1PAVETKVT9/messier_1.fits+%285%29.jpg Afterglow Astrophotography - 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A https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664375323524-08O1JI5O2VNULWV62FJU/ngc_604-002.fits+%281%29.jpg Afterglow Astrophotography - B https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664375915866-9I6UTWWXUNOKM9HP9KL0/ngc_604-001.fits+%282%29.jpg Afterglow Astrophotography - C https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664376344468-E70OB5J29611NGIGV3TZ/ngc_604-001.fits+%284%29.jpg Afterglow Astrophotography - D https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664375331087-KPHJ8WAE3I2RJCC5SN11/ngc_604-002.fits+%283%29.jpg Afterglow Astrophotography - E https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664375337333-4KV363D2EN723FNPZ199/ngc_604-003.fits+%284%29.jpg Afterglow Astrophotography - F https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/41d9b1ff-61d7-4e4b-b239-ecf1e7a3cfe9/ngc_253.fits+%2828%29.jpg Afterglow Astrophotography - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664338384034-4ZLLV6LUQUYAF8BCG54Z/ngc_253.fits+%2820%29.jpg Afterglow Astrophotography - A https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664338389781-PAAF4MMT6AZWRA3ROLLI/ngc_253.fits+%2821%29.jpg Afterglow Astrophotography - B https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664338394752-20ZX4XWJZB6A7R0NG5YD/ngc_253.fits+%2822%29.jpg Afterglow Astrophotography - C https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664338399938-MRZPJ3W0EJ3B7K75EIRY/ngc_253.fits+%2823%29.jpg Afterglow Astrophotography - D https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664338406222-D31INXAK24CC7MQEIF7T/ngc_253.fits+%2824%29.jpg Afterglow Astrophotography - E https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664338414604-V28NPFGSSD9Z1H6IE4KF/ngc_253.fits+%2825%29.jpg Afterglow Astrophotography - F https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664338422923-PATEG5N5P3L3A5XJU2UR/ngc_253.fits+%2827%29.jpg Afterglow Astrophotography - G https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664338428893-NVJR0QEFV9NR0K0X590H/ngc_253.fits+%2828%29.jpg Afterglow Astrophotography - H https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1935b5fa-c581-4fa2-ba46-0d45a88a6da0/helix.fits+%286%29.jpg Afterglow Astrophotography - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664389782984-AK4463Y3G7O8F8KGT63O/helix.fits+%281%29.jpg Afterglow Astrophotography - A https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664389785278-JHGJQ24VM3CCFMAPTS79/helix.fits+%282%29.jpg Afterglow Astrophotography - B https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664389787937-J8LLT7FXTDJKT2DY6KZX/helix.fits+%283%29.jpg Afterglow Astrophotography - C https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664389790651-GAZKPOKY1DHPC3CWLCHX/helix.fits+%284%29.jpg Afterglow Astrophotography - D https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664389794149-CDAUG4DLRBECDZNQSO80/helix.fits+%285%29.jpg Afterglow Astrophotography - E https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664389795425-CFUDPNYCTYQG6EQ8L6O6/helix.fits+%286%29.jpg Afterglow Astrophotography - F https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/3627ae06-b4a8-4776-8d47-b17bd5343beb/ngc_604-001.fits+%286%29.jpg Afterglow Astrophotography - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664057653884-MIRCN7UH8Q1DL3KRHW71/ngc_604-001.fits+%280%29.jpg Afterglow Astrophotography - A https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664057663864-DIO1ZCOP5Z3OREJT9W65/ngc_604-001.fits+%281%29.jpg Afterglow Astrophotography - B https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664057668123-G1CR3FB56EY02KXILTU8/ngc_604-001.fits+%282%29.jpg Afterglow Astrophotography - C https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664057672886-5K9YNUFGQL79ZAKS1ZL5/ngc_604-001.fits+%283%29.jpg Afterglow Astrophotography - D https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664057677222-S4VK74AFV268S5ZU8M11/ngc_604-001.fits+%284%29.jpg Afterglow Astrophotography - E https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664057680831-DEB8FBHHX8E52F4QCUQD/ngc_604-001.fits+%285%29.jpg Afterglow Astrophotography - F https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1664057688393-HUN1NBT9XJ96G9I1IIGH/ngc_604-001.fits+%286%29.jpg Afterglow Astrophotography - G https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/5cc3118b-efcf-41d0-936a-c779e5642166/bean+5.jpg Afterglow Astrophotography - Make it stand out Whatever it is, the way you tell your story online can make all the difference. https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1663308249546-KG741MK4EBQRKLVD1TUK/bean+1.jpg Afterglow Astrophotography - A https://images.squarespace-cdn.com/content/v1/5c3b6709506fbed3995d9723/1663308256964-LSTTNIBXIZVS31RUGF55/bean+3.jpg Afterglow Astrophotography - 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