IOTA/IOTA-ES occultation update for (784) Pickeringia / UCAC4 273-142550 event on 2024 Oct 06, 21:14 UT Visible from Summary ------- On 2024 Oct 06 UT, the 79.9473849029625 km diameter asteroid (784) Pickeringia will occult a 11.7 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.81 mag to 14.37 mag (the magnitude of the asteroid) for at most 2.850 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2024 Oct 06, 21:11 - 2024 Oct 06, 21:18 * geocentric midpoint of event [JD]: 2460590.38541529 * magnitude of target star: 11.65 * magnitude drop [mag]: 2.81 * estimated maximum duration [s]: 2.850 * Moon: 14 % sunlit, 33° distance * Sun: 76° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 83 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.001", 94°) * approx speed of asteroid's shadow [km/s]: 28.1000 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 273-142550 by 784 Pickeringia on 2024 Oct 6 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude -150 0 0 4 20 35 21 11 21.4 0 126 77 3 52 58 4 48 16 3 44 55 4 56 22 .... -149 0 0 3 37 54 21 11 21.5 2 126 78 3 10 23 4 5 29 3 2 21 4 13 34 -0.06 -148 0 0 2 55 36 21 11 21.7 3 126 79 2 28 10 3 23 6 2 20 10 3 31 9 -0.15 -147 0 0 2 13 43 21 11 22.0 4 126 80 1 46 23 2 41 7 1 38 25 2 49 9 -0.19 -146 0 0 1 32 16 21 11 22.4 5 126 81 1 5 2 1 59 35 0 57 5 2 7 34 -0.21 -145 0 0 0 51 16 21 11 22.9 7 126 82 0 24 8 1 18 29 0 16 13 1 26 27 -0.22 -144 0 0 0 10 45 21 11 23.6 8 126 83 - 0 16 17 0 37 51 - 0 24 11 0 45 47 -0.23 -143 0 0 - 0 29 17 21 11 24.3 9 126 84 - 0 56 13 - 0 2 17 - 1 4 5 0 5 38 -0.23 -142 0 0 - 1 8 48 21 11 25.1 10 126 85 - 1 35 38 - 0 41 54 - 1 43 28 - 0 34 2 -0.24 -141 0 0 - 1 47 48 21 11 26.0 11 126 86 - 2 14 31 - 1 21 0 - 2 22 19 - 1 13 9 -0.24 -140 0 0 - 2 26 15 21 11 27.0 13 126 87 - 2 52 52 - 1 59 33 - 3 0 38 - 1 51 45 -0.25 -139 0 0 - 3 4 8 21 11 28.1 14 126 87 - 3 30 39 - 2 37 33 - 3 38 23 - 2 29 47 -0.25 -138 0 0 - 3 41 27 21 11 29.3 15 126 87 - 4 7 51 - 3 14 59 - 4 15 34 - 3 7 14 -0.25 -137 0 0 - 4 18 11 21 11 30.6 16 126 86 - 4 44 29 - 3 51 50 - 4 52 9 - 3 44 7 -0.25 -136 0 0 - 4 54 19 21 11 32.0 17 126 85 - 5 20 30 - 4 28 4 - 5 28 9 - 4 20 23 -0.25 -135 0 0 - 5 29 51 21 11 33.5 18 126 84 - 5 55 56 - 5 3 43 - 6 3 32 - 4 56 4 -0.26 -134 0 0 - 6 4 46 21 11 35.0 20 125 83 - 6 30 44 - 5 38 44 - 6 38 18 - 5 31 7 -0.26 -133 0 0 - 6 39 3 21 11 36.7 21 125 82 - 7 4 54 - 6 13 8 - 7 12 27 - 6 5 32 -0.26 -132 0 0 - 7 12 41 21 11 38.4 22 125 81 - 7 38 26 - 6 46 53 - 7 45 57 - 6 39 20 -0.26 -131 0 0 - 7 45 41 21 11 40.1 23 125 80 - 8 11 20 - 7 20 0 - 8 18 48 - 7 12 28 -0.26 -130 0 0 - 8 18 3 21 11 42.0 24 125 79 - 8 43 34 - 7 52 27 - 8 51 1 - 7 44 58 -0.26 -129 0 0 - 8 49 44 21 11 43.9 25 125 78 - 9 15 9 - 8 24 16 - 9 22 34 - 8 16 48 -0.26 -128 0 0 - 9 20 46 21 11 45.9 26 125 77 - 9 46 5 - 8 55 24 - 9 53 28 - 8 47 59 -0.26 -127 0 0 - 9 51 8 21 11 48.0 27 125 75 -10 16 20 - 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Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 273-142550 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 59 06.8440 DE: -35 24 10.477 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 59 06.8440 DE: -35 24 10.477 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * B mag [mag]: 12.6 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (784) Pickeringia asteroid class: approx. diameter [km]: 80 approx. diameter ["]: 0.044 distance from Earth [AU]: 2.50410 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#63 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.026", 0.001", 94.058° remarks: * orbital elements for (784)Pickeringia : Mean anomaly = 24.8812242289 deg Arg. of pericenter = 237.8627128824 deg Long. of node = 14.8949876699 deg Inclination = 12.2785151566 deg Eccentricity = 0.2410202871 Semimajor axis = 3.0993436200 AU Perihelion dist = 2.3523389309 AU Mag: H = 9.32, G = 0.15 Epoch of elements : MJD 60589.88541508 TDT (2024 Oct 06.8854) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#632023Apr24,2.85,2024,10,6,21.249967,-0.047323,0.265789,15.618285,2.760757,0.005480,-0.000278,0.000000,0.000000 -64.5787,-35.4067,-141.78,-5.56,False UCAC4 273-142550,17.98523449,-35.4029103,12.60,11.65,11.14,0.1,0,,18.01273790,-35.4067266,2.81,2.87,0,0,0 784,Pickeringia,14.37,80.129,2.5041,0,0,4.487,9.70,,4.0,0 0,24.7213,2024,10,6,237.8627,14.8950,12.2785,0.24102,3.09934,2.35234,9.32,5.0,0.15 1.146,0.0260,0.0012,94,0.0064,Known errors,0.68,0,-1,-1 20241006_142550,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org