IOTA/IOTA-ES occultation update for (943) Begonia / UCAC4 355-154983 event on 2023 Jul 05, 19:18 UT Visible from Africa Summary ------- On 2023 Jul 05 UT, the 67.1 km diameter asteroid (943) Begonia will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.68 mag to 15.05 mag (the magnitude of the asteroid) for at most 4.200 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: 2023 Jul 05, 19:11 - 2023 Jul 05, 19:24 * geocentric midpoint of event [JD]: 2460131.30428196 * magnitude of target star: 11.41 * magnitude drop [mag]: 3.68 * estimated maximum duration [s]: 4.200 * Moon: 91 % sunlit, 39° distance * Sun: 174° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 68 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.002", 99°) * approx speed of asteroid's shadow [km/s]: 15.9849 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 355-154983 by 943 Begonia on 2023 Jul 5 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 - 33 0 0 -23 14 29 19 24 42.9 0 111 2 -22 54 47 -23 34 13 -22 44 48 -23 44 13 .... - 32 0 0 -23 35 24 19 24 42.8 1 110 1 -23 15 43 -23 55 5 -23 5 45 -24 5 5 0.20 - 31 0 0 -23 55 59 19 24 42.5 2 110 0 -23 36 20 -24 15 38 -23 26 23 -24 25 37 0.18 - 30 0 0 -24 16 15 19 24 42.2 3 110 -1 -23 56 38 -24 35 52 -23 46 42 -24 45 50 0.18 - 29 0 0 -24 36 11 19 24 41.7 4 109 -2 -24 16 37 -24 55 47 -24 6 41 -25 5 44 0.17 - 28 0 0 -24 55 48 19 24 41.2 5 109 -3 -24 36 16 -25 15 22 -24 26 21 -25 25 18 0.17 - 27 0 0 -25 15 6 19 24 40.5 6 108 -4 -24 55 35 -25 34 38 -24 45 41 -25 44 33 0.17 - 26 0 0 -25 34 3 19 24 39.7 7 108 -5 -25 14 34 -25 53 33 -25 4 41 -26 3 27 0.17 - 25 0 0 -25 52 40 19 24 38.8 8 107 -5 -25 33 13 -26 12 8 -25 23 21 -26 22 1 0.17 - 24 0 0 -26 10 57 19 24 37.8 9 107 -6 -25 51 31 -26 30 23 -25 41 41 -26 40 15 0.17 - 23 0 0 -26 28 53 19 24 36.7 10 107 -7 -26 9 30 -26 48 17 -25 59 40 -26 58 8 0.17 - 22 0 0 -26 46 28 19 24 35.5 11 106 -8 -26 27 7 -27 5 51 -26 17 18 -27 15 41 0.17 - 21 0 0 -27 3 43 19 24 34.2 12 106 -9 -26 44 24 -27 23 4 -26 34 36 -27 32 53 0.17 - 20 0 0 -27 20 37 19 24 32.8 13 105 -10 -27 1 20 -27 39 56 -26 51 33 -27 49 44 0.17 - 19 0 0 -27 37 11 19 24 31.3 14 105 -11 -27 17 55 -27 56 27 -27 8 9 -28 6 15 0.17 - 18 0 0 -27 53 23 19 24 29.7 15 104 -12 -27 34 9 -28 12 37 -27 24 24 -28 22 24 0.17 - 17 0 0 -28 9 14 19 24 28.0 16 104 -13 -27 50 2 -28 28 27 -27 40 18 -28 38 12 0.17 - 16 0 0 -28 24 44 19 24 26.2 16 103 -14 -28 5 34 -28 43 55 -27 55 51 -28 53 39 0.17 - 15 0 0 -28 39 52 19 24 24.4 17 103 -15 -28 20 44 -28 59 2 -28 11 2 -29 8 45 0.17 - 14 0 0 -28 54 40 19 24 22.4 18 102 -16 -28 35 33 -29 13 47 -28 25 52 -29 23 30 0.17 - 13 0 0 -29 9 6 19 24 20.4 19 102 -17 -28 50 1 -29 28 11 -28 40 21 -29 37 53 0.17 - 12 0 0 -29 23 10 19 24 18.2 20 101 -17 -29 4 8 -29 42 14 -28 54 28 -29 51 55 0.17 - 11 0 0 -29 36 54 19 24 16.0 21 101 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0.17 136 0 0 - 3 43 31 19 12 7.0 22 251 -26 - 3 23 29 - 4 3 34 - 3 13 20 - 4 13 45 0.17 137 0 0 - 3 17 59 19 12 4.2 21 251 -25 - 2 57 58 - 3 38 1 - 2 47 50 - 3 48 11 0.17 138 0 0 - 2 52 35 19 12 1.5 20 251 -24 - 2 32 36 - 3 12 36 - 2 22 27 - 3 22 46 0.17 139 0 0 - 2 27 20 19 11 58.9 19 251 -23 - 2 7 22 - 2 47 20 - 1 57 14 - 2 57 29 0.17 140 0 0 - 2 2 14 19 11 56.5 18 251 -22 - 1 42 17 - 2 22 13 - 1 32 10 - 2 32 21 0.17 141 0 0 - 1 37 18 19 11 54.3 17 250 -21 - 1 17 22 - 1 57 16 - 1 7 16 - 2 7 24 0.18 142 0 0 - 1 12 33 19 11 52.1 16 250 -20 - 0 52 38 - 1 32 29 - 0 42 32 - 1 42 36 0.18 143 0 0 - 0 47 58 19 11 50.1 15 250 -19 - 0 28 5 - 1 7 53 - 0 18 0 - 1 18 0 0.18 144 0 0 - 0 23 35 19 11 48.3 14 250 -18 - 0 3 43 - 0 43 29 0 6 21 - 0 53 35 0.18 145 0 0 0 0 35 19 11 46.6 13 250 -17 0 20 26 - 0 19 17 0 30 30 - 0 29 22 0.18 146 0 0 0 24 33 19 11 45.0 12 250 -16 0 44 23 0 4 43 0 54 25 - 0 5 22 0.18 147 0 0 0 48 18 19 11 43.6 10 250 -15 1 8 6 0 28 29 1 18 8 0 18 25 0.18 148 0 0 1 11 49 19 11 42.3 9 250 -14 1 31 35 0 52 1 1 41 36 0 41 58 0.19 149 0 0 1 35 5 19 11 41.1 8 250 -12 1 54 50 1 15 19 2 4 51 1 5 17 0.19 150 0 0 1 58 7 19 11 40.1 7 250 -11 2 17 50 1 38 23 2 27 50 1 28 22 0.19 151 0 0 2 20 54 19 11 39.2 6 250 -10 2 40 35 2 1 11 2 50 34 1 51 10 0.20 152 0 0 2 43 24 19 11 38.5 5 250 -9 3 3 4 2 23 43 3 13 2 2 13 44 0.20 153 0 0 3 5 39 19 11 37.8 4 251 -8 3 25 17 2 45 59 3 35 14 2 36 1 0.22 154 0 0 3 27 36 19 11 37.4 3 251 -7 3 47 13 3 7 59 3 57 9 2 58 1 0.23 155 0 0 3 49 17 19 11 37.1 2 251 -6 4 8 52 3 29 41 4 18 47 3 19 44 0.27 156 0 0 4 10 40 19 11 36.9 1 251 -5 4 30 13 3 51 6 4 40 7 3 41 10 0.40 Uncertainty in time = +/- 3 secs Prediction of 2023 May 14.2 Data for the target star ------------------------ * name: UCAC4 355-154983 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 37 50.7432 DE: -19 10 14.564 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 37 50.7432 DE: -19 10 14.564 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (943) Begonia asteroid class: approx. diameter [km]: 67 approx. diameter ["]: 0.034 distance from Earth [AU]: 2.72010 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 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): 0.021", 0.002", 99.447° remarks: * orbital elements for (943)Begonia : Mean anomaly = 153.3597455380 deg Arg. of pericenter = 3.8807498270 deg Long. of node = 113.7483815266 deg Inclination = 12.1102529707 deg Eccentricity = 0.2138936221 Semimajor axis = 3.1153107522 AU Perihelion dist = 2.4489656514 AU Mag: H = 9.80, G = 0.15 Epoch of elements : MJD 60130.80416667 TDT (2023 Jul 05.8042) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,4.20,2023,7,5,19.302767,0.042974,-0.165542,-8.732882,-2.266946,0.000426,-0.000361,0.000001,0.000000 66.7428,-19.1506,-108.38,22.75,False UCAC4 355-154983,18.63076200,-19.1707123,0.00,11.41,0.00,0.0,0,,18.65408221,-19.1505675,3.68,0.00,0,0,0 943,Begonia,15.05,67.1,2.7201,0,0,-1.992,-7.33,,3.4,0 0,153.2156,2023,7,5,3.8807,113.7484,12.1103,0.21389,3.11531,2.44897,9.81,5.0,0.15 1.254,0.0207,0.0021,99,0.0086,Known errors,-1.00,-1,-1,-1 20230705_154983,60078.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 14, 03:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org