IOTA/IOTA-ES occultation update for (87) Sylvia / UCAC4 323-214686 event on 2023 Apr 08, 14:12 UT Visible from New Zealand Summary ------- On 2023 Apr 08 UT, the 286 km diameter asteroid (87) Sylvia will occult a 12.4 mag star in the constellation Sagittarius for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.16 mag to 13.08 mag (the magnitude of the asteroid) for at most 13.140 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: 100 * date and approx. time of event: 2023 Apr 08, 14:08 - 2023 Apr 08, 14:16 * geocentric midpoint of event [JD]: 2460043.09200421 * magnitude of target star: 12.38 * magnitude drop [mag]: 1.16 * estimated maximum duration [s]: 13.140 * Moon: 94 % sunlit, 70° distance * Sun: 81° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 347 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.004", 84°) * approx speed of asteroid's shadow [km/s]: 21.7665 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 323-214686 by 87 Sylvia #1 on 2023 Apr 8 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 145 0 0 .. .. .... .. .. .. .. .. .. -31 6 27 .. .. .. -31 12 3 .. .. .. .... 146 0 0 -29 46 10 14 8 27.9 0 120 -67 -31 36 32 .. .. .. -31 42 9 .. .. .. .... 147 0 0 -30 16 7 14 8 28.0 1 119 -67 -32 6 43 -28 28 17 -32 12 21 -28 22 57 0.58 148 0 0 -30 46 9 14 8 28.2 2 119 -67 -32 36 58 -28 58 7 -32 42 36 -28 52 46 0.63 149 0 0 -31 16 16 14 8 28.5 3 118 -66 -33 7 17 -29 28 2 -33 12 56 -29 22 41 0.65 150 0 0 -31 46 25 14 8 28.9 4 117 -65 -33 37 38 -29 58 1 -33 43 17 -29 52 39 0.67 151 0 0 -32 16 37 14 8 29.4 5 117 -65 -34 8 1 -30 28 2 -34 13 41 -30 22 40 0.67 152 0 0 -32 46 50 14 8 30.0 6 116 -64 -34 38 24 -30 58 6 -34 44 5 -30 52 43 0.68 153 0 0 -33 17 3 14 8 30.8 7 116 -64 -35 8 47 -31 28 10 -35 14 28 -31 22 47 0.68 154 0 0 -33 47 16 14 8 31.6 8 115 -63 -35 39 8 -31 58 14 -35 44 50 -31 52 50 0.68 155 0 0 -34 17 26 14 8 32.5 9 115 -62 -36 9 27 -32 28 17 -36 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-36 5 43 14 16 27.2 8 244 42 -37 58 3 -34 16 16 -38 3 46 -34 10 50 0.77 - 10 0 0 -35 35 50 14 16 28.0 7 243 42 -37 28 5 -33 46 28 -37 33 48 -33 41 3 0.78 - 9 0 0 -35 5 52 14 16 28.6 6 243 42 -36 58 1 -33 16 36 -37 3 43 -33 11 11 0.80 - 8 0 0 -34 35 50 14 16 29.1 5 242 42 -36 27 52 -32 46 40 -36 33 34 -32 41 16 0.82 - 7 0 0 -34 5 45 14 16 29.6 4 242 42 -35 57 39 -32 16 42 -36 3 21 -32 11 18 0.85 - 6 0 0 -33 35 37 14 16 29.9 3 241 42 -35 27 23 -31 46 43 -35 33 4 -31 41 19 0.90 - 5 0 0 -33 5 29 14 16 30.2 2 240 41 -34 57 5 -31 16 42 -35 2 46 -31 11 19 1.01 - 4 0 0 -32 35 19 14 16 30.3 1 240 41 -34 26 46 .. .. .. -34 32 26 .. .. .. 1.42 - 3 0 0 .. .. .... .. .. .. .. .. .. -33 56 27 .. .. .. -34 2 6 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 323-214686 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 59 10.0584 DE: -25 33 25.543 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 59 10.0585 DE: -25 33 25.542 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (87) Sylvia asteroid class: ShapeModel asteroid system: multiple bodies approx. diameter [km]: 286 approx. diameter ["]: 0.120 distance from Earth [AU]: 3.27820 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#109 date of fit: 2023 Feb 07 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): 0.011", 0.003", 83.829° remarks: * orbital elements for (87)Sylvia : Mean anomaly = 310.9741301094 deg Arg. of pericenter = 264.3151467232 deg Long. of node = 73.0106845929 deg Inclination = 10.8799767234 deg Eccentricity = 0.0939434124 Semimajor axis = 3.4775152909 AU Perihelion dist = 3.1508256377 AU Mag: H = 6.98, G = 0.15 Epoch of elements : MJD 60042.59208333 TDT (2023 Apr 08.5921) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1092023Feb07 Binary solution 1 : Kepler,13.14,2023,4,8,14.208101,-0.014379,-0.566007,12.281648,-0.311743,-0.005612,-0.001223,0.000000,0.000000 -109.5617,-25.4946,-32.65,7.25,False UCAC4 323-214686,19.98612731,-25.5570952,0.00,12.38,0.00,0.0,0,,20.00931954,-25.4946222,1.16,0.00,0,0,0 87,Sylvia #1,13.08,286.0,3.2782,0,2,2.434,-0.83,,12.0,0 Romulus,10.8,1351.350,3.654000,0.0069,1.70,2453249.50,167.000,175.00,193.17, Remus,10.6,701.640,1.373000,0.0930,2.00,2453249.50,281.000,135.00,194.28, 0,310.8841,2023,4,8,264.3151,73.0107,10.8800,0.09394,3.47752,3.15083,7.00,5.0,0.15 1.025,0.0113,0.0026,84,0.0030,Known errors + binary orbit,-1.00,-1,-1,-1 20230408_214686_Ma1,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org