IOTA/IOTA-ES occultation update for (23) Thalia / UCAC4 404-000917 event on 2022 Oct 10, 20:34 UT Visible from S Africa Summary ------- On 2022 Oct 10 UT, the 103.9 km diameter asteroid (23) Thalia will occult a 12.4 mag star in the constellation Cetus for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.31 mag to 11.17 mag (the magnitude of the asteroid) for at most 8.020 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: 2022 Oct 10, 20:26 - 2022 Oct 10, 20:42 * geocentric midpoint of event [JD]: 2459863.35741216 * magnitude of target star: 12.38 * magnitude drop [mag]: 0.31 * estimated maximum duration [s]: 8.020 * Moon: 99 % sunlit, 26° distance * Sun: 163° distance * rough path description: S Africa Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 111 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.021) * 1 sigma uncertainty ellipse (major, minor, PA): (0.028", 0.019", 62°) * approx speed of asteroid's shadow [km/s]: 12.9622 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 404-000917 by 23 Thalia on 2022 Oct 10 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 - 54 0 0 -32 30 32 20 42 22.6 0 101 12 -32 0 10 -33 0 59 -31 45 9 -33 16 8 .... - 53 0 0 -32 40 4 20 42 22.6 1 100 11 -32 9 43 -33 10 30 -31 54 43 -33 25 38 0.28 - 52 0 0 -32 49 22 20 42 22.3 2 100 11 -32 19 3 -33 19 47 -32 4 3 -33 34 54 0.31 - 51 0 0 -32 58 27 20 42 22.0 3 99 10 -32 28 9 -33 28 51 -32 13 10 -33 43 57 0.33 - 50 0 0 -33 7 18 20 42 21.6 4 99 9 -32 37 1 -33 37 40 -32 22 3 -33 52 46 0.33 - 49 0 0 -33 15 55 20 42 21.0 4 98 8 -32 45 40 -33 46 16 -32 30 42 -34 1 21 0.34 - 48 0 0 -33 24 18 20 42 20.4 5 97 7 -32 54 4 -33 54 38 -32 39 7 -34 9 43 0.34 - 47 0 0 -33 32 27 20 42 19.6 6 97 6 -33 2 14 -34 2 46 -32 47 18 -34 17 50 0.34 - 46 0 0 -33 40 23 20 42 18.7 7 96 6 -33 10 11 -34 10 40 -32 55 15 -34 25 44 0.35 - 45 0 0 -33 48 4 20 42 17.7 8 96 5 -33 17 53 -34 18 20 -33 2 57 -34 33 23 0.35 - 44 0 0 -33 55 31 20 42 16.6 9 95 4 -33 25 21 -34 25 46 -33 10 26 -34 40 49 0.35 - 43 0 0 -34 2 44 20 42 15.4 9 95 3 -33 32 35 -34 32 58 -33 17 41 -34 48 0 0.35 - 42 0 0 -34 9 43 20 42 14.1 10 94 2 -33 39 35 -34 39 56 -33 24 41 -34 54 57 0.35 - 41 0 0 -34 16 27 20 42 12.7 11 94 2 -33 46 21 -34 46 40 -33 31 27 -35 1 40 0.35 - 40 0 0 -34 22 58 20 42 11.2 12 93 1 -33 52 53 -34 53 9 -33 37 59 -35 8 9 0.35 - 39 0 0 -34 29 14 20 42 9.6 13 92 0 -33 59 10 -34 59 24 -33 44 17 -35 14 24 0.35 - 38 0 0 -34 35 16 20 42 7.8 14 92 -1 -34 5 13 -35 5 25 -33 50 21 -35 20 25 0.35 - 37 0 0 -34 41 4 20 42 6.0 14 91 -2 -34 11 1 -35 11 12 -33 56 10 -35 26 11 0.35 - 36 0 0 -34 46 37 20 42 4.1 15 91 -2 -34 16 36 -35 16 45 -34 1 44 -35 31 43 0.35 - 35 0 0 -34 51 57 20 42 2.1 16 90 -3 -34 21 56 -35 22 3 -34 7 5 -35 37 1 0.35 - 34 0 0 -34 57 1 20 41 59.9 17 89 -4 -34 27 1 -35 27 7 -34 12 11 -35 42 5 0.35 - 33 0 0 -35 1 52 20 41 57.7 18 89 -5 -34 31 53 -35 31 57 -34 17 3 -35 46 54 0.35 - 32 0 0 -35 6 28 20 41 55.4 18 88 -6 -34 36 30 -35 36 33 -34 21 40 -35 51 29 0.35 - 31 0 0 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265 -23 -10 55 38 -11 57 9 -10 40 26 -12 12 27 0.37 116 0 0 -11 12 15 20 27 31.5 21 264 -22 -10 41 34 -11 43 3 -10 26 23 -11 58 21 0.37 117 0 0 -10 58 20 20 27 28.4 20 264 -21 -10 27 40 -11 29 6 -10 12 30 -11 44 24 0.37 118 0 0 -10 44 35 20 27 25.4 19 264 -20 -10 13 57 -11 15 20 - 9 58 47 -11 30 37 0.37 119 0 0 -10 31 1 20 27 22.6 18 264 -19 -10 0 23 -11 1 45 - 9 45 14 -11 17 1 0.37 120 0 0 -10 17 37 20 27 19.9 17 263 -18 - 9 47 1 -10 48 20 - 9 31 52 -11 3 35 0.37 121 0 0 -10 4 25 20 27 17.4 16 263 -17 - 9 33 49 -10 35 6 - 9 18 42 -10 50 21 0.37 122 0 0 - 9 51 23 20 27 15.0 15 263 -16 - 9 20 49 -10 22 3 - 9 5 42 -10 37 18 0.37 123 0 0 - 9 38 33 20 27 12.8 14 263 -15 - 9 8 0 -10 9 12 - 8 52 54 -10 24 26 0.37 124 0 0 - 9 25 55 20 27 10.7 13 263 -14 - 8 55 24 - 9 56 33 - 8 40 18 -10 11 46 0.38 125 0 0 - 9 13 29 20 27 8.8 12 263 -14 - 8 42 59 - 9 44 5 - 8 27 54 - 9 59 18 0.38 126 0 0 - 9 1 16 20 27 7.0 11 262 -13 - 8 30 47 - 9 31 50 - 8 15 42 - 9 47 3 0.38 127 0 0 - 8 49 15 20 27 5.4 10 262 -12 - 8 18 47 - 9 19 48 - 8 3 43 - 9 35 0 0.38 128 0 0 - 8 37 26 20 27 4.0 9 262 -11 - 8 7 0 - 9 7 59 - 7 51 56 - 9 23 10 0.38 129 0 0 - 8 25 51 20 27 2.7 8 262 -10 - 7 55 26 - 8 56 23 - 7 40 23 - 9 11 33 0.39 130 0 0 - 8 14 30 20 27 1.5 7 262 -9 - 7 44 5 - 8 45 0 - 7 29 3 - 9 0 9 0.39 131 0 0 - 8 3 21 20 27 0.6 6 262 -8 - 7 32 58 - 8 33 50 - 7 17 57 - 8 48 59 0.40 132 0 0 - 7 52 27 20 26 59.7 5 261 -7 - 7 22 5 - 8 22 55 - 7 7 4 - 8 38 3 0.41 133 0 0 - 7 41 47 20 26 59.1 4 261 -6 - 7 11 26 - 8 12 13 - 6 56 26 - 8 27 21 0.43 134 0 0 - 7 31 21 20 26 58.6 3 261 -5 - 7 1 1 - 8 1 46 - 6 46 1 - 8 16 53 0.45 135 0 0 - 7 21 9 20 26 58.3 2 261 -4 - 6 50 51 - 7 51 33 - 6 35 51 - 8 6 40 0.51 136 0 0 - 7 11 12 20 26 58.1 1 261 -3 - 6 40 55 - 7 41 35 - 6 25 56 - 7 56 41 0.77 Uncertainty in time = +/- 3 secs Prediction of 2022 Aug 20.1 Data for the target star ------------------------ * name: UCAC4 404-000917 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 00 45 18.9605 DE: -09 13 31.789 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 00 45 18.9605 DE: -09 13 31.790 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (23) Thalia asteroid class: approx. diameter [km]: 104 approx. diameter ["]: 0.079 distance from Earth [AU]: 1.81870 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#108 date of fit: 2022 Aug 03 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): 0.028", 0.019", 61.588° remarks: * orbital elements for (23)Thalia : Mean anomaly = 267.6046606985 deg Arg. of pericenter = 61.2863488276 deg Long. of node = 66.5241574825 deg Inclination = 10.1023542845 deg Eccentricity = 0.2313863727 Semimajor axis = 2.6307179531 AU Perihelion dist = 2.0220056683 AU Mag: H = 7.18, G = 0.15 Epoch of elements : MJD 59862.85729167 TDT (2022 Oct 10.8573) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1082022Aug03,8.02,2022,10,10,20.577892,0.075910,-0.332465,-7.134283,-1.621527,0.000444,0.001574,0.000001,0.000000 43.5262,-9.1002,-131.94,-6.88,False UCAC4 404-000917,0.75526681,-9.2254970,0.00,12.38,0.00,0.0,0,,0.77460517,-9.1002489,0.31,0.00,0,0,0 23,Thalia,11.17,103.9,1.8187,0,0,-2.329,-7.84,,6.4,0 0,267.4066,2022,10,10,61.2863,66.5242,10.1024,0.23139,2.63072,2.02201,7.18,5.0,0.15 1.248,0.0283,0.0187,62,0.0195,Known errors,-1.00,-1,-1,-1 20221010_000917,59811.11 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Aug 20, 02:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org