IOTA/IOTA-ES occultation update for (87) Sylvia / UCAC4-289-208205 event on 2023 Jul 30, 02:19 UT Visible from Africa Summary ------- On 2023 Jul 30 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 Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.43 mag to 11.66 mag (the magnitude of the asteroid) for at most 24.210 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 Jul 30, 02:11 - 2023 Jul 30, 02:28 * geocentric midpoint of event [JD]: 2460155.59726734 * magnitude of target star: 12.43 * magnitude drop [mag]: 0.43 * estimated maximum duration [s]: 24.210 * Moon: 89 % sunlit, 28° distance * Sun: 164° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 322 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.027, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.007", 86°) * approx speed of asteroid's shadow [km/s]: 11.8132 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-289-208205 by 87 Sylvia #1 on 2023 Jul 30 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 -164 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -38 40 21 .. .. .. -38 49 22 .... -163 0 0 -37 26 10 2 28 3.3 0 132 15 .. .. .. -39 23 29 .. .. .. -39 32 29 .... -162 0 0 -38 8 54 2 28 3.1 1 131 14 -36 14 21 -40 6 3 -36 5 46 -40 15 3 0.46 -161 0 0 -38 51 4 2 28 2.8 2 130 13 -36 56 42 -40 48 3 -36 48 8 -40 57 2 0.47 -160 0 0 -39 32 40 2 28 2.2 3 130 12 -37 38 30 -41 29 26 -37 29 57 -41 38 24 0.48 -159 0 0 -40 13 41 2 28 1.4 4 129 11 -38 19 45 -42 10 13 -38 11 12 -42 19 10 0.48 -158 0 0 -40 54 5 2 28 0.5 5 129 10 -39 0 24 -42 50 22 -38 51 53 -42 59 17 0.49 -157 0 0 -41 33 53 2 27 59.3 6 128 9 -39 40 27 -43 29 52 -39 31 57 -43 38 46 0.49 -156 0 0 -42 13 2 2 27 58.0 7 127 8 -40 19 53 -44 8 43 -40 11 24 -44 17 36 0.49 -155 0 0 -42 51 32 2 27 56.6 8 127 7 -40 58 42 -44 46 54 -40 50 15 -44 55 45 0.49 -154 0 0 -43 29 23 2 27 55.0 9 126 6 -41 36 52 -45 24 24 -41 28 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45 6 -18 39 19 0.52 42 0 0 -15 56 50 2 12 22.6 14 240 -20 -14 9 30 -17 46 18 -14 1 26 -17 54 41 0.52 43 0 0 -15 13 3 2 12 19.6 13 240 -19 -13 26 9 -17 2 3 -13 18 8 -17 10 24 0.53 44 0 0 -14 29 38 2 12 16.9 12 239 -18 -12 43 11 -16 18 9 -12 35 12 -16 26 28 0.53 45 0 0 -13 46 37 2 12 14.4 11 239 -17 -12 0 37 -15 34 38 -11 52 40 -15 42 55 0.54 46 0 0 -13 4 1 2 12 12.1 9 239 -16 -11 18 29 -14 51 33 -11 10 34 -14 59 47 0.54 47 0 0 -12 21 51 2 12 10.2 8 239 -15 -10 36 47 -14 8 53 -10 28 54 -14 17 5 0.55 48 0 0 -11 40 9 2 12 8.5 7 238 -14 - 9 55 34 -13 26 41 - 9 47 43 -13 34 50 0.56 49 0 0 -10 58 56 2 12 7.0 6 238 -12 - 9 14 50 -12 44 57 - 9 7 1 -12 53 4 0.57 50 0 0 -10 18 13 2 12 5.9 5 238 -11 - 8 34 36 -12 3 45 - 8 26 49 -12 11 49 0.59 51 0 0 - 9 38 3 2 12 4.9 4 238 -10 - 7 54 54 -11 23 3 - 7 47 10 -11 31 5 0.63 52 0 0 - 8 58 25 2 12 4.3 2 238 -9 - 7 15 45 -10 42 54 - 7 8 3 -10 50 54 0.69 53 0 0 - 8 19 20 2 12 3.9 1 238 -8 - 6 37 10 -10 3 19 - 6 29 30 -10 11 17 0.90 54 0 0 - 7 40 51 2 12 3.8 0 237 -7 .. .. .. - 9 24 19 .. .. .. - 9 32 14 81.44 Uncertainty in time = +/- 3 secs Prediction of 2023 May 29.0 Data for the target star ------------------------ * name: UCAC4-289-208205 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 57 04.6887 DE: -32 16 04.818 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 57 04.6887 DE: -32 16 04.818 * 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 ["]: 0.177 distance from Earth [AU]: 2.22190 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#110 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", 0.005", 86.272° remarks: * orbital elements for (87)Sylvia : Mean anomaly = 328.0214040931 deg Arg. of pericenter = 264.3724323072 deg Long. of node = 73.0115793610 deg Inclination = 10.8801999596 deg Eccentricity = 0.0939161553 Semimajor axis = 3.4772099844 AU Perihelion dist = 3.1506437914 AU Mag: H = 6.98, G = 0.15 Epoch of elements : MJD 60155.09708333 TDT (2023 Jul 30.0971) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1102023Apr24 Binary solution 1 : Kepler,24.21,2023,7,30,2.334416,0.142686,-0.434390,-6.334687,-2.080866,0.000898,0.001293,0.000001,0.000000 -42.8391,-32.2048,146.61,18.59,False UCAC4-289-208205,19.95130241,-32.2680050,0.00,12.43,0.00,0.0,0,,19.97656492,-32.2048354,0.43,0.00,0,0,0 87,Sylvia #1,11.66,286.0,2.2219,0,2,-1.974,-8.23,,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, 0,328.0066,2023,7,30,264.3724,73.0116,10.8802,0.09392,3.47721,3.15064,6.97,5.0,0.15 1.038,0.0187,0.0050,86,0.0067,Known errors + binary orbit,-1.00,-1,-1,-1 20230730_208205_Ma1,60092.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 28, 23:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org