IOTA/IOTA-ES occultation update for (943) Begonia / UCAC4 359-172061 event on 2023 Jun 18, 13:28 UT Visible from Australia Summary ------- On 2023 Jun 18 UT, the 67.1 km diameter asteroid (943) Begonia will occult a 11.2 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 4.09 mag to 15.23 mag (the magnitude of the asteroid) for at most 4.470 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 18, 13:21 - 2023 Jun 18, 13:36 * geocentric midpoint of event [JD]: 2460114.06168175 * magnitude of target star: 11.17 * magnitude drop [mag]: 4.09 * estimated maximum duration [s]: 4.470 * Moon: 0 % sunlit, 165° distance * Sun: 164° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 67 * 1 sigma uncertainty interval [path widths]: +/- 0.23 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.002", 98°) * approx speed of asteroid's shadow [km/s]: 15.0178 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 359-172061 by 943 Begonia on 2023 Jun 18 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 80 0 0 -10 30 3 13 35 53.3 1 109 -17 -10 10 49 -10 49 16 -10 1 48 -10 58 17 .... 81 0 0 -10 49 44 13 35 53.1 2 108 -18 -10 30 32 -11 8 55 -10 21 31 -11 17 55 0.02 82 0 0 -11 9 6 13 35 52.8 3 108 -19 -10 49 55 -11 28 15 -10 40 56 -11 37 14 -0.01 83 0 0 -11 28 8 13 35 52.3 4 108 -20 -11 9 0 -11 47 17 -11 0 1 -11 56 15 -0.03 84 0 0 -11 46 52 13 35 51.7 5 108 -21 -11 27 45 -12 5 59 -11 18 48 -12 14 56 -0.04 85 0 0 -12 5 16 13 35 51.0 6 108 -22 -11 46 11 -12 24 21 -11 37 14 -12 33 18 -0.04 86 0 0 -12 23 21 13 35 50.2 7 107 -23 -12 4 18 -12 42 24 -11 55 21 -12 51 20 -0.04 87 0 0 -12 41 6 13 35 49.2 8 107 -24 -12 22 4 -13 0 7 -12 13 9 -13 9 2 -0.05 88 0 0 -12 58 30 13 35 48.1 9 107 -25 -12 39 30 -13 17 30 -12 30 36 -13 26 24 -0.05 89 0 0 -13 15 35 13 35 46.9 10 107 -26 -12 56 36 -13 34 33 -12 47 43 -13 43 26 -0.05 90 0 0 -13 32 19 13 35 45.5 11 106 -27 -13 13 22 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3 11 58 51 11 19 42 12 8 2 11 10 32 -0.06 -111 0 0 12 2 15 13 21 54.7 12 248 4 12 21 49 11 42 42 12 30 59 11 33 32 -0.06 -110 0 0 12 25 2 13 21 53.2 11 248 5 12 44 34 12 5 30 12 53 44 11 56 20 -0.06 -109 0 0 12 47 37 13 21 51.7 10 248 6 13 7 8 12 28 6 13 16 17 12 18 57 -0.06 -108 0 0 13 9 59 13 21 50.5 9 249 7 13 29 29 12 50 29 13 38 38 12 41 21 -0.06 -107 0 0 13 32 8 13 21 49.4 8 249 8 13 51 37 13 12 39 14 0 45 13 3 32 -0.05 -106 0 0 13 54 4 13 21 48.4 7 249 9 14 13 31 13 34 36 14 22 39 13 25 29 -0.05 -105 0 0 14 15 45 13 21 47.5 6 249 10 14 35 12 13 56 19 14 44 18 13 47 13 -0.05 -104 0 0 14 37 13 13 21 46.8 5 250 11 14 56 38 14 17 48 15 5 44 14 8 42 -0.05 -103 0 0 14 58 25 13 21 46.3 4 250 12 15 17 49 14 39 2 15 26 54 14 29 57 -0.04 -102 0 0 15 19 23 13 21 45.8 3 250 13 15 38 45 15 0 1 15 47 50 14 50 57 -0.03 -101 0 0 15 40 5 13 21 45.5 2 250 14 15 59 25 15 20 44 16 8 29 15 11 41 -0.02 -100 0 0 16 0 31 13 21 45.4 1 251 15 16 19 50 15 41 12 16 28 53 15 32 9 0.05 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 359-172061 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 51 24.7686 DE: -18 22 13.657 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 51 24.7686 DE: -18 22 13.657 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.2 * 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]: 2.73420 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", 98.394° remarks: * orbital elements for (943)Begonia : Mean anomaly = 150.2655823178 deg Arg. of pericenter = 3.8835922729 deg Long. of node = 113.7485629663 deg Inclination = 12.1101107105 deg Eccentricity = 0.2138760133 Semimajor axis = 3.1153654847 AU Perihelion dist = 2.4490635347 AU Mag: H = 9.80, G = 0.15 Epoch of elements : MJD 60113.56159722 TDT (2023 Jun 18.5616) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,4.47,2023,6,18,13.480362,-0.013204,0.053291,-8.228544,-2.035070,-0.001485,-0.000577,0.000001,0.000000 174.4624,-18.3428,-21.92,23.41,False UCAC4 359-172061,18.85688017,-18.3704603,0.00,11.17,0.00,0.0,0,,18.87995162,-18.3428107,4.09,0.00,0,0,0 943,Begonia,15.23,67.1,2.7342,0,0,-1.858,-6.54,,3.4,0 0,150.1649,2023,6,18,3.8836,113.7486,12.1101,0.21388,3.11537,2.44906,9.81,5.0,0.15 1.234,0.0203,0.0020,98,0.0079,Known errors,-1.00,-1,-1,-1 20230618_172061,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org