IOTA/IOTA-ES occultation update for (943) Begonia / UCAC4 348-135977 event on 2023 Aug 03, 08:17 UT Visible from E Australia Summary ------- On 2023 Aug 03 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 E Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.20 mag to 15.57 mag (the magnitude of the asteroid) for at most 6.220 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 Aug 03, 08:07 - 2023 Aug 03, 08:27 * geocentric midpoint of event [JD]: 2460159.84549508 * magnitude of target star: 12.43 * magnitude drop [mag]: 3.20 * estimated maximum duration [s]: 6.220 * Moon: 96 % sunlit, 58° distance * Sun: 144° distance * rough path description: E Australia The occultation path -------------------- * approximate projected width [km]: 68 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.002", 101°) * approx speed of asteroid's shadow [km/s]: 10.7873 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 348-135977 by 943 Begonia on 2023 Aug 3 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 101 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. -14 27 22 .... 102 0 0 -14 17 11 8 27 18.0 1 111 34 -13 57 33 -14 36 49 -13 44 32 -14 49 48 .... 103 0 0 -14 39 14 8 27 17.8 2 111 33 -14 19 38 -14 58 48 -14 6 39 -15 11 46 -0.03 104 0 0 -15 0 47 8 27 17.3 3 110 32 -14 41 15 -15 20 18 -14 28 17 -15 33 14 -0.07 105 0 0 -15 21 51 8 27 16.7 4 110 31 -15 2 22 -15 41 19 -14 49 26 -15 54 13 -0.08 106 0 0 -15 42 26 8 27 15.8 5 110 30 -15 23 0 -16 1 51 -15 10 6 -16 14 43 -0.09 107 0 0 -16 2 32 8 27 14.8 6 110 29 -15 43 8 -16 21 54 -15 30 17 -16 34 44 -0.10 108 0 0 -16 22 8 8 27 13.6 7 109 28 -16 2 47 -16 41 27 -15 49 58 -16 54 15 -0.10 109 0 0 -16 41 15 8 27 12.2 8 109 27 -16 21 57 -17 0 32 -16 9 9 -17 13 18 -0.11 110 0 0 -16 59 53 8 27 10.7 9 109 26 -16 40 38 -17 19 7 -16 27 52 -17 31 51 -0.11 111 0 0 -17 18 1 8 27 9.0 10 109 25 -16 58 49 -17 37 12 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Uncertainty in time = +/- 4 secs Prediction of 2023 Jun 15.2 Data for the target star ------------------------ * name: UCAC4 348-135977 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 18 25.2300 DE: -20 31 42.845 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 18 25.2300 DE: -20 31 42.845 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * 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 ["]: 0.032 distance from Earth [AU]: 2.88290 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): 0.019", 0.002", 101.354° remarks: * orbital elements for (943)Begonia : Mean anomaly = 158.4821038194 deg Arg. of pericenter = 3.8757570544 deg Long. of node = 113.7481273077 deg Inclination = 12.1105004324 deg Eccentricity = 0.2139260334 Semimajor axis = 3.1152126529 AU Perihelion dist = 2.4487875668 AU Mag: H = 9.80, G = 0.15 Epoch of elements : MJD 60159.34534722 TDT (2023 Aug 03.3453) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,6.22,2023,8,3,8.291882,-0.041954,0.107002,-5.667209,-2.225817,0.003354,-0.000110,0.000001,0.000000 -161.0777,-20.5196,57.19,17.53,False UCAC4 348-135977,18.30700835,-20.5285680,0.00,12.43,0.00,0.0,0,,18.33061369,-20.5195799,3.20,0.00,0,0,0 943,Begonia,15.57,67.100,2.8829,0,0,-1.230,-6.79,,3.4,0 0,158.4202,2023,8,3,3.8758,113.7481,12.1105,0.21393,3.11521,2.44879,9.79,5.0,0.15 1.331,0.0193,0.0022,101,0.0106,Known errors,-1.00,-1,-1,-1 20230803_135977,60110.21 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jun 15, 05:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org