IOTA/IOTA-ES occultation update for (943) Begonia / UCAC4-353-139072 event on 2023 Jul 14, 10:10 UT Visible from Australia Summary ------- On 2023 Jul 14 UT, the 67.1 km diameter asteroid (943) Begonia will occult a 12.4 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 2.93 mag to 15.23 mag (the magnitude of the asteroid) for at most 4.400 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 14, 10:03 - 2023 Jul 14, 10:17 * geocentric midpoint of event [JD]: 2460139.92420737 * magnitude of target star: 12.38 * magnitude drop [mag]: 2.93 * estimated maximum duration [s]: 4.400 * Moon: 11 % sunlit, 155° distance * Sun: 165° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 68 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.002", 100°) * approx speed of asteroid's shadow [km/s]: 15.2605 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-353-139072 by 943 Begonia on 2023 Jul 14 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 93 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -23 23 35 .. .. .. -23 34 6 .... 94 0 0 -23 25 22 10 17 44.1 1 111 11 -23 5 41 -23 45 5 -22 55 12 -23 55 34 .... 95 0 0 -23 46 34 10 17 43.9 2 111 10 -23 26 54 -24 6 14 -23 16 27 -24 16 43 0.17 96 0 0 -24 7 25 10 17 43.6 3 110 9 -23 47 47 -24 27 3 -23 37 21 -24 37 31 0.17 97 0 0 -24 27 56 10 17 43.1 4 110 8 -24 8 20 -24 47 32 -23 57 55 -24 57 59 0.16 98 0 0 -24 48 6 10 17 42.6 5 109 7 -24 28 32 -25 7 40 -24 18 8 -25 18 5 0.16 99 0 0 -25 7 55 10 17 41.9 6 109 6 -24 48 23 -25 27 27 -24 38 0 -25 37 51 0.16 100 0 0 -25 27 22 10 17 41.1 7 108 5 -25 7 53 -25 46 53 -24 57 31 -25 57 16 0.16 101 0 0 -25 46 29 10 17 40.2 8 108 4 -25 27 2 -26 5 57 -25 16 41 -26 16 19 0.15 102 0 0 -26 5 14 10 17 39.2 9 108 3 -25 45 49 -26 24 40 -25 35 29 -26 35 2 0.15 103 0 0 -26 23 38 10 17 38.1 10 107 2 -26 4 15 -26 43 2 -25 53 56 -26 53 22 0.15 104 0 0 -26 41 40 10 17 36.9 11 107 1 -26 22 19 -27 1 2 -26 12 1 -27 11 21 0.15 105 0 0 -26 59 20 10 17 35.6 12 106 0 -26 40 1 -27 18 40 -26 29 45 -27 28 58 0.15 106 0 0 -27 16 38 10 17 34.1 12 106 -1 -26 57 21 -27 35 56 -26 47 6 -27 46 13 0.15 107 0 0 -27 33 35 10 17 32.6 13 105 -1 -27 14 20 -27 52 51 -27 4 5 -28 3 6 0.15 108 0 0 -27 50 9 10 17 31.0 14 105 -2 -27 30 56 -28 9 23 -27 20 43 -28 19 38 0.15 109 0 0 -28 6 21 10 17 29.2 15 104 -3 -27 47 10 -28 25 33 -27 36 58 -28 35 47 0.15 110 0 0 -28 22 11 10 17 27.4 16 104 -4 -28 3 2 -28 41 21 -27 52 51 -28 51 34 0.15 111 0 0 -28 37 39 10 17 25.5 17 103 -5 -28 18 32 -28 56 47 -28 8 22 -29 6 59 0.15 112 0 0 -28 52 45 10 17 23.5 18 103 -6 -28 33 40 -29 11 51 -28 23 31 -29 22 1 0.15 113 0 0 -29 7 28 10 17 21.4 19 102 -7 -28 48 25 -29 26 32 -28 38 17 -29 36 42 0.15 114 0 0 -29 21 49 10 17 19.2 20 102 -8 -29 2 48 -29 40 52 -28 52 41 -29 51 0 0.15 115 0 0 -29 35 48 10 17 16.9 21 101 -9 -29 16 48 -29 54 48 -29 6 42 -30 4 56 0.15 116 0 0 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Uncertainty in time = +/- 3 secs Prediction of 2023 May 14.2 Data for the target star ------------------------ * name: UCAC4-353-139072 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 31 07.6540 DE: -19 35 22.697 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 31 07.6540 DE: -19 35 22.697 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.4 * 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]: 2.74570 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", 100.045° remarks: * orbital elements for (943)Begonia : Mean anomaly = 154.9066749964 deg Arg. of pericenter = 3.8793041316 deg Long. of node = 113.7483002097 deg Inclination = 12.1103245343 deg Eccentricity = 0.2139025929 Semimajor axis = 3.1152831253 AU Perihelion dist = 2.4489159873 AU Mag: H = 9.80, G = 0.15 Epoch of elements : MJD 60139.42409722 TDT (2023 Jul 14.4241) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,4.40,2023,7,14,10.180977,0.041537,-0.150321,-8.302188,-2.294665,0.001395,-0.000278,0.000001,0.000000 -166.6046,-19.5733,28.76,21.68,False UCAC4-353-139072,18.51879278,-19.5896380,0.00,12.38,0.00,0.0,0,,18.54221018,-19.5732775,2.92,0.00,0,0,0 943,Begonia,15.23,67.1,2.7457,0,0,-1.881,-7.35,,3.4,0 0,154.8307,2023,7,14,3.8793,113.7483,12.1103,0.21390,3.11528,2.44892,9.81,5.0,0.15 1.266,0.0203,0.0021,100,0.0090,Known errors,-1.00,-1,-1,-1 20230714_139072,60078.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 14, 04:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org