IOTA/IOTA-ES occultation update for (90) Antiope / UCAC4 347-186402 event on 2022 Oct 26, 10:30 UT Visible from E Australia Summary ------- On 2022 Oct 26 UT, the 120.1 km diameter asteroid (90) Antiope will occult a 12.5 mag star in the constellation Capricornus for observers along a path across E Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.39 mag to 13.53 mag (the magnitude of the asteroid) for at most 7.340 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: 100 * date and approx. time of event: 2022 Oct 26, 10:24 - 2022 Oct 26, 10:37 * geocentric midpoint of event [JD]: 2459878.93807245 * magnitude of target star: 12.50 * magnitude drop [mag]: 1.39 * estimated maximum duration [s]: 7.340 * Moon: 1 % sunlit, 82° distance * Sun: 95° distance * rough path description: E Australia The occultation path -------------------- * approximate projected width [km]: 125 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 77°) * approx speed of asteroid's shadow [km/s]: 16.3733 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 347-186402 by 90 Antiope on 2022 Oct 26 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 17 0 0 -32 1 57 10 24 35.1 0 114 70 -32 39 19 .. .. .. -32 41 32 .. .. .. .... 18 0 0 -32 24 59 10 24 35.2 1 114 70 -33 2 15 -31 47 50 -33 4 28 -31 45 38 0.30 19 0 0 -32 47 38 10 24 35.4 2 113 70 -33 24 50 -32 10 34 -33 27 2 -32 8 22 0.30 20 0 0 -33 9 54 10 24 35.7 3 113 69 -33 47 1 -32 32 55 -33 49 14 -32 30 44 0.30 21 0 0 -33 31 48 10 24 36.0 4 112 69 -34 8 51 -32 54 54 -34 11 3 -32 52 43 0.30 22 0 0 -33 53 20 10 24 36.5 5 112 69 -34 30 17 -33 16 30 -34 32 28 -33 14 19 0.30 23 0 0 -34 14 28 10 24 37.1 6 111 68 -34 51 20 -33 37 43 -34 53 31 -33 35 32 0.30 24 0 0 -34 35 12 10 24 37.8 6 111 68 -35 12 0 -33 58 33 -35 14 11 -33 56 22 0.30 25 0 0 -34 55 34 10 24 38.6 7 110 67 -35 32 16 -34 18 59 -35 34 27 -34 16 49 0.30 26 0 0 -35 15 32 10 24 39.4 8 109 67 -35 52 9 -34 39 2 -35 54 19 -34 36 52 0.30 27 0 0 -35 35 6 10 24 40.4 9 109 66 -36 11 38 -34 58 41 -36 13 48 -34 56 32 0.30 28 0 0 -35 54 16 10 24 41.4 10 108 65 -36 30 43 -35 17 56 -36 32 53 -35 15 47 0.30 29 0 0 -36 13 3 10 24 42.5 11 108 65 -36 49 25 -35 36 48 -36 51 34 -35 34 39 0.30 30 0 0 -36 31 26 10 24 43.8 12 107 64 -37 7 42 -35 55 16 -37 9 52 -35 53 7 0.30 31 0 0 -36 49 24 10 24 45.0 13 106 64 -37 25 36 -36 13 19 -37 27 45 -36 11 11 0.30 32 0 0 -37 6 59 10 24 46.4 13 106 63 -37 43 5 -36 30 59 -37 45 14 -36 28 51 0.30 33 0 0 -37 24 9 10 24 47.9 14 105 62 -38 0 11 -36 48 15 -38 2 19 -36 46 7 0.30 34 0 0 -37 40 56 10 24 49.4 15 105 62 -38 16 52 -37 5 6 -38 19 0 -37 2 59 0.30 35 0 0 -37 57 18 10 24 51.0 16 104 61 -38 33 10 -37 21 33 -38 35 17 -37 19 26 0.30 36 0 0 -38 13 16 10 24 52.7 17 103 61 -38 49 3 -37 37 36 -38 51 10 -37 35 30 0.30 37 0 0 -38 28 50 10 24 54.5 18 103 60 -39 4 32 -37 53 15 -39 6 39 -37 51 9 0.30 38 0 0 -38 44 0 10 24 56.3 18 102 59 -39 19 37 -38 8 30 -39 21 44 -38 6 24 0.30 39 0 0 -38 58 46 10 24 58.2 19 101 59 -39 34 18 -38 23 20 -39 36 25 -38 21 15 0.30 40 0 0 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10 36 35.1 21 250 -68 - 7 23 28 - 6 7 33 - 7 25 44 - 6 5 18 0.32 -172 0 0 - 6 15 57 10 36 37.9 20 250 -69 - 6 53 54 - 5 38 8 - 6 56 10 - 5 35 53 0.32 -171 0 0 - 5 46 43 10 36 40.6 19 250 -70 - 6 24 36 - 5 8 59 - 6 26 51 - 5 6 45 0.32 -170 0 0 - 5 17 47 10 36 43.1 18 250 -71 - 5 55 35 - 4 40 7 - 5 57 50 - 4 37 53 0.32 -169 0 0 - 4 49 8 10 36 45.5 17 250 -72 - 5 26 52 - 4 11 32 - 5 29 6 - 4 9 19 0.32 -168 0 0 - 4 20 47 10 36 47.7 16 250 -73 - 4 58 26 - 3 43 17 - 5 0 40 - 3 41 4 0.32 -167 0 0 - 3 52 46 10 36 49.8 15 250 -73 - 4 30 20 - 3 15 20 - 4 32 34 - 3 13 7 0.32 -166 0 0 - 3 25 4 10 36 51.7 14 250 -74 - 4 2 33 - 2 47 43 - 4 4 46 - 2 45 30 0.32 -165 0 0 - 2 57 42 10 36 53.4 13 250 -74 - 3 35 6 - 2 20 26 - 3 37 19 - 2 18 14 0.33 -164 0 0 - 2 30 41 10 36 55.1 11 250 -75 - 3 8 0 - 1 53 30 - 3 10 13 - 1 51 18 0.33 -163 0 0 - 2 4 1 10 36 56.5 10 249 -75 - 2 41 15 - 1 26 55 - 2 43 28 - 1 24 44 0.33 -162 0 0 - 1 37 43 10 36 57.8 9 249 -76 - 2 14 52 - 1 0 43 - 2 17 4 - 0 58 31 0.33 -161 0 0 - 1 11 48 10 36 59.0 8 249 -76 - 1 48 51 - 0 34 52 - 1 51 3 - 0 32 41 0.34 -160 0 0 - 0 46 15 10 37 0.0 7 249 -76 - 1 23 14 - 0 9 25 - 1 25 25 - 0 7 14 0.34 -159 0 0 - 0 21 6 10 37 0.9 6 249 -76 - 0 57 59 0 15 39 - 1 0 10 0 17 50 0.35 -158 0 0 0 3 39 10 37 1.6 5 249 -77 - 0 33 8 0 40 19 - 0 35 19 0 42 30 0.36 -157 0 0 0 28 1 10 37 2.2 4 249 -76 - 0 8 42 1 4 36 - 0 10 52 1 6 45 0.38 -156 0 0 0 51 58 10 37 2.6 3 249 -76 0 15 21 1 28 27 0 13 10 1 30 37 0.41 -155 0 0 1 15 30 10 37 2.9 2 249 -76 0 38 58 1 51 54 0 36 48 1 54 3 0.48 -154 0 0 1 38 36 10 37 3.1 1 249 -76 1 2 10 2 14 56 1 0 0 2 17 5 0.80 Uncertainty in time = +/- 2 secs Prediction of 2022 Oct 17.0 Data for the target star ------------------------ * name: UCAC4 347-186402 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 43 49.1424 DE: -20 39 05.928 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 43 49.1420 DE: -20 39 05.930 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (90) Antiope asteroid class: asteroid system: multiple bodies approx. diameter [km]: 120 approx. diameter ["]: 0.070 distance from Earth [AU]: 2.35100 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#119 date of fit: 2022 Sep 23 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): 0.016", 0.002", 76.519° remarks: * orbital elements for (90)Antiope : Mean anomaly = 10.4635979292 deg Arg. of pericenter = 245.2006488593 deg Long. of node = 69.9463111962 deg Inclination = 2.2069128387 deg Eccentricity = 0.1672616960 Semimajor axis = 3.1483673237 AU Perihelion dist = 2.6217660654 AU Mag: H = 8.51, G = 0.15 Epoch of elements : MJD 59878.43805555 TDT (2022 Oct 26.4381) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1192022Sep23,7.34,2022,10,26,10.513739,0.087694,-0.263921,8.783737,2.872578,0.005571,0.001539,0.000000,0.000000 118.7928,-20.5706,18.29,-12.51,False UCAC4 347-186402,20.73031724,-20.6516470,0.00,12.50,0.00,0.0,0,,20.75201649,-20.5706456,1.39,0.00,0,0,0 90,Antiope,13.53,120.1,2.3510,0,1,2.340,10.75,,7.2,0 S/2000 (90) 1,83.8,171,0.687700,0.0030,63.70,,,, 0,10.3863,2022,10,26,245.2006,69.9463,2.2069,0.16726,3.14837,2.62177,8.51,5.0,0.15 1.030,0.0157,0.0017,77,0.0021,Known errors,-1.00,-1,-1,-1 20221026_186402,59868.96 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Oct 16, 23:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org