IOTA/IOTA-ES occultation update for (943) Begonia / UCAC4 361-178154 event on 2023 Jun 06, 20:34 UT Visible from Australia Summary ------- On 2023 Jun 06 UT, the 67.1 km diameter asteroid (943) Begonia will occult a 12.5 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.04 mag to 15.43 mag (the magnitude of the asteroid) for at most 5.350 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: 99 * date and approx. time of event: 2023 Jun 06, 20:26 - 2023 Jun 06, 20:42 * geocentric midpoint of event [JD]: 2460102.35725037 * magnitude of target star: 12.46 * magnitude drop [mag]: 3.04 * estimated maximum duration [s]: 5.350 * Moon: 89 % sunlit, 14° distance * Sun: 151° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 76 * 1 sigma uncertainty interval [path widths]: +/- 0.23 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.002", 98°) * approx speed of asteroid's shadow [km/s]: 12.5317 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 361-178154 by 943 Begonia on 2023 Jun 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 - 25 0 0 -39 53 58 20 41 55.7 1 113 -26 -39 31 45 -40 16 15 -39 21 39 -40 26 26 .... - 24 0 0 -40 13 44 20 41 55.6 1 112 -27 -39 51 34 -40 36 0 -39 41 29 -40 46 10 0.47 - 23 0 0 -40 33 13 20 41 55.3 2 112 -28 -40 11 5 -40 55 26 -40 1 1 -41 5 36 0.49 - 22 0 0 -40 52 24 20 41 54.9 3 111 -28 -40 30 18 -41 14 35 -40 20 15 -41 24 43 0.49 - 21 0 0 -41 11 16 20 41 54.4 4 110 -29 -40 49 12 -41 33 25 -40 39 10 -41 43 33 0.50 - 20 0 0 -41 29 51 20 41 53.8 5 110 -30 -41 7 49 -41 51 57 -40 57 48 -42 2 4 0.50 - 19 0 0 -41 48 6 20 41 53.0 5 109 -31 -41 26 7 -42 10 11 -41 16 7 -42 20 16 0.50 - 18 0 0 -42 6 4 20 41 52.2 6 108 -32 -41 44 6 -42 28 6 -41 34 7 -42 38 10 0.51 - 17 0 0 -42 23 42 20 41 51.3 7 108 -32 -42 1 47 -42 45 42 -41 51 49 -42 55 45 0.51 - 16 0 0 -42 41 2 20 41 50.2 8 107 -33 -42 19 9 -43 3 0 -42 9 12 -43 13 2 0.51 - 15 0 0 -42 58 3 20 41 49.1 9 106 -34 -42 36 12 -43 19 58 -42 26 16 -43 29 59 0.51 - 14 0 0 -43 14 45 20 41 47.8 9 106 -34 -42 52 56 -43 36 38 -42 43 2 -43 46 38 0.51 - 13 0 0 -43 31 8 20 41 46.5 10 105 -35 -43 9 22 -43 52 59 -42 59 28 -44 2 58 0.51 - 12 0 0 -43 47 12 20 41 45.1 11 104 -36 -43 25 28 -44 9 0 -43 15 35 -44 18 58 0.51 - 11 0 0 -44 2 57 20 41 43.5 12 104 -37 -43 41 16 -44 24 43 -43 31 24 -44 34 40 0.51 - 10 0 0 -44 18 23 20 41 41.9 12 103 -37 -43 56 44 -44 40 7 -43 46 53 -44 50 2 0.51 - 9 0 0 -44 33 30 20 41 40.2 13 102 -38 -44 11 53 -44 55 11 -44 2 4 -45 5 6 0.51 - 8 0 0 -44 48 18 20 41 38.5 14 101 -39 -44 26 43 -45 9 57 -44 16 55 -45 19 51 0.51 - 7 0 0 -45 2 47 20 41 36.6 15 101 -39 -44 41 14 -45 24 24 -44 31 27 -45 34 16 0.51 - 6 0 0 -45 16 57 20 41 34.7 15 100 -40 -44 55 27 -45 38 31 -44 45 40 -45 48 22 0.52 - 5 0 0 -45 30 47 20 41 32.6 16 99 -41 -45 9 20 -45 52 19 -44 59 34 -46 2 10 0.52 - 4 0 0 -45 44 19 20 41 30.5 17 99 -41 -45 22 54 -46 5 49 -45 13 9 -46 15 38 0.52 - 3 0 0 -45 57 32 20 41 28.4 18 98 -42 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-17 7 17 0.55 169 0 0 -16 13 8 20 27 3.5 9 254 16 -15 51 17 -16 35 4 -15 41 20 -16 45 5 0.56 170 0 0 -15 51 14 20 27 1.9 8 254 17 -15 29 25 -16 13 8 -15 19 30 -16 23 9 0.56 171 0 0 -15 29 36 20 27 0.6 7 253 18 -15 7 49 -15 51 28 -14 57 54 -16 1 27 0.57 172 0 0 -15 8 13 20 26 59.4 6 253 19 -14 46 28 -15 30 3 -14 36 35 -15 40 1 0.58 173 0 0 -14 47 7 20 26 58.5 5 253 20 -14 25 24 -15 8 55 -14 15 32 -15 18 52 0.60 174 0 0 -14 26 18 20 26 57.7 4 253 21 -14 4 37 -14 48 3 -13 54 46 -14 57 59 0.62 175 0 0 -14 5 46 20 26 57.1 3 252 22 -13 44 7 -14 27 29 -13 34 17 -14 37 24 0.65 176 0 0 -13 45 31 20 26 56.7 2 252 23 -13 23 55 -14 7 12 -13 14 6 -14 17 7 0.73 177 0 0 -13 25 36 20 26 56.4 1 252 24 -13 4 1 -13 47 14 -12 54 13 -13 57 8 1.02 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 361-178154 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 59 22.8276 DE: -17 54 18.996 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 59 22.8276 DE: -17 54 18.996 * position source: Gaia DR3 * 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: (943) Begonia asteroid class: approx. diameter [km]: 67 approx. diameter ["]: 0.033 distance from Earth [AU]: 2.79170 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): 0.020", 0.002", 97.875° remarks: * orbital elements for (943)Begonia : Mean anomaly = 148.1652427605 deg Arg. of pericenter = 3.8855534873 deg Long. of node = 113.7486878354 deg Inclination = 12.1100236760 deg Eccentricity = 0.2138650268 Semimajor axis = 3.1154008656 AU Perihelion dist = 2.4491255759 AU Mag: H = 9.80, G = 0.15 Epoch of elements : MJD 60101.85715278 TDT (2023 Jun 06.8572) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,5.35,2023,6,6,20.574009,0.113323,-0.452692,-6.861485,-1.717790,-0.002690,-0.000700,0.000001,0.000000 81.5836,-17.8734,-128.92,22.69,False UCAC4 361-178154,18.98967433,-17.9052768,0.00,12.46,0.00,0.0,0,,19.01257241,-17.8733921,3.04,0.00,0,0,0 943,Begonia,15.43,67.1,2.7917,0,0,-1.513,-5.41,,3.4,0 0,148.0116,2023,6,6,3.8856,113.7487,12.1100,0.21387,3.11540,2.44913,9.81,5.0,0.15 1.228,0.0197,0.0019,98,0.0076,Known errors,-1.00,-1,-1,-1 20230606_178154,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org