IOTA/IOTA-ES occultation update for (20899) 2000 XB3 / UCAC4 323-090587 event on 2024 Oct 04, 16:18 UT Visible from Summary ------- On 2024 Oct 04 UT, the 11.5228157854494 km diameter asteroid (20899) 2000 XB3 will occult a 11.7 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.13 mag to 17.83 mag (the magnitude of the asteroid) for at most 0.350 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: 98 * date and approx. time of event: 2024 Oct 04, 16:14 - 2024 Oct 04, 16:21 * geocentric midpoint of event [JD]: 2460588.17927900 * magnitude of target star: 11.70 * magnitude drop [mag]: 6.13 * estimated maximum duration [s]: 0.350 * Moon: 3 % sunlit, 42° distance * Sun: 62° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.002", 83°) * approx speed of asteroid's shadow [km/s]: 33.2492 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 323-090587 by 20899 2000 XB3 on 2024 Oct 4 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 - 98 0 0 - 6 2 48 16 14 58.5 0 116 59 - 6 6 20 - 5 59 17 - 6 8 54 - 5 56 42 .... - 97 0 0 - 6 31 32 16 14 58.5 1 115 60 - 6 35 4 - 6 28 1 - 6 37 38 - 6 25 27 0.15 - 96 0 0 - 7 0 13 16 14 58.6 2 115 61 - 7 3 44 - 6 56 41 - 7 6 18 - 6 54 7 0.12 - 95 0 0 - 7 28 48 16 14 58.8 4 115 62 - 7 32 20 - 7 25 17 - 7 34 54 - 7 22 43 0.11 - 94 0 0 - 7 57 19 16 14 59.1 5 115 63 - 8 0 50 - 7 53 47 - 8 3 24 - 7 51 13 0.10 - 93 0 0 - 8 25 43 16 14 59.4 6 115 64 - 8 29 14 - 8 22 12 - 8 31 48 - 8 19 38 0.10 - 92 0 0 - 8 54 0 16 14 59.8 7 115 64 - 8 57 31 - 8 50 29 - 9 0 5 - 8 47 55 0.09 - 91 0 0 - 9 22 10 16 15 0.3 8 115 65 - 9 25 41 - 9 18 39 - 9 28 14 - 9 16 5 0.09 - 90 0 0 - 9 50 11 16 15 0.9 9 114 66 - 9 53 42 - 9 46 40 - 9 56 16 - 9 44 7 0.09 - 89 0 0 -10 18 4 16 15 1.5 10 114 67 -10 21 34 -10 14 33 -10 24 8 -10 11 59 0.09 - 88 0 0 -10 45 46 16 15 2.2 11 114 68 -10 49 17 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42 37 16 21 21.1 1 245 -61 - 1 46 8 - 1 39 6 - 1 48 42 - 1 36 32 0.36 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 323-090587 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 47 03.6485 DE: -25 24 12.305 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 47 03.6485 DE: -25 24 12.305 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * B mag [mag]: 12.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (20899) 2000 XB3 asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.22240 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#42 date of fit: 2023 Apr 25 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): 0.017", 0.002", 83.451° remarks: * orbital elements for (20899)2000 XB3 : Mean anomaly = 332.3096097483 deg Arg. of pericenter = 34.4260019794 deg Long. of node = 296.6441402475 deg Inclination = 11.9346521724 deg Eccentricity = 0.3032444475 Semimajor axis = 2.5735620553 AU Perihelion dist = 1.7931436517 AU Mag: H = 13.43, G = 0.15 Epoch of elements : MJD 60587.67927883 TDT (2024 Oct 04.6793) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#422023Apr25,0.35,2024,10,4,16.302696,0.002547,-0.070334,18.749164,0.812890,0.004583,-0.000694,-0.000001,0.000000 -6.2458,-25.4485,-67.41,-4.72,False UCAC4 323-090587,16.78434687,-25.4034182,12.48,11.70,11.28,0.1,0,,16.80936194,-25.4484845,6.14,6.11,0,0,0 20899,2000 XB3,17.83,11.684,2.2224,0,0,5.478,3.22,,1.0,0 0,332.1474,2024,10,4,34.4260,296.6441,11.9347,0.30324,2.57356,1.79314,13.43,5.0,0.15 1.365,0.0170,0.0023,83,0.0026,Known errors,1.03,0,-1,-1 20241004_090587,60140.61 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org