IOTA/IOTA-ES occultation update for (87) Sylvia / UCAC4-295-230688 event on 2023 Oct 17, 01:50 UT Visible from South America Summary ------- On 2023 Oct 17 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 South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.99 mag to 12.80 mag (the magnitude of the asteroid) for at most 17.600 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 Oct 17, 01:44 - 2023 Oct 17, 01:56 * geocentric midpoint of event [JD]: 2460234.57658088 * magnitude of target star: 12.36 * magnitude drop [mag]: 0.99 * estimated maximum duration [s]: 17.600 * Moon: 5 % sunlit, 64° distance * Sun: 91° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 312 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.005", 87°) * approx speed of asteroid's shadow [km/s]: 16.2538 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-295-230688 by 87 Sylvia #1 on 2023 Oct 17 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 0 0 0 .. .. .... .. .. .. .. .. .. -37 52 12 .. .. .. -37 55 47 .. .. .. .... 131 0 0 -36 40 53 1 44 17.4 0 130 57 -38 32 37 .. .. .. -38 36 12 .. .. .. .... 132 0 0 -37 20 59 1 44 17.5 1 129 57 -39 12 30 -35 31 31 -39 16 4 .. .. .. 0.43 133 0 0 -38 0 33 1 44 17.7 2 129 57 -39 51 48 -36 11 19 -39 55 22 -36 7 53 0.44 134 0 0 -38 39 33 1 44 18.1 3 128 57 -40 30 31 -36 50 34 -40 34 4 -36 47 9 0.44 135 0 0 -39 17 58 1 44 18.6 4 127 57 -41 8 38 -37 29 16 -41 12 10 -37 25 51 0.45 136 0 0 -39 55 47 1 44 19.3 5 127 57 -41 46 8 -38 7 24 -41 49 40 -38 3 59 0.45 137 0 0 -40 33 0 1 44 20.0 6 126 56 -42 23 0 -38 44 56 -42 26 31 -38 41 32 0.45 138 0 0 -41 9 36 1 44 20.9 7 125 56 -42 59 14 -39 21 52 -43 2 45 -39 18 29 0.45 139 0 0 -41 45 34 1 44 21.9 8 125 56 -43 34 50 -39 58 12 -43 38 20 -39 54 49 0.45 140 0 0 -42 20 54 1 44 22.9 9 124 56 -44 9 46 -40 33 54 -44 13 15 -40 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- 2 15 40 - 5 39 42 - 2 12 32 0.66 - 25 0 0 - 3 18 1 1 56 16.5 1 239 -75 - 4 58 39 - 1 38 54 - 5 1 52 - 1 35 47 0.89 0 0 0 .. .. .... .. .. .. .. .. .. - 4 21 31 .. .. .. - 4 24 43 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: UCAC4-295-230688 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 52 51.8768 DE: -31 05 58.763 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 52 51.8768 DE: -31 05 58.763 * 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 ["]: 0.132 distance from Earth [AU]: 2.99400 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#113 date of fit: 2023 Oct 09 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): 0.006", 0.001", 88.173° remarks: * orbital elements for (87)Sylvia : Mean anomaly = 339.9808815670 deg Arg. of pericenter = 264.4234362192 deg Long. of node = 73.0125017204 deg Inclination = 10.8803341478 deg Eccentricity = 0.0938635660 Semimajor axis = 3.4768864166 AU Perihelion dist = 3.1505334591 AU Mag: H = 6.97, G = 0.15 Epoch of elements : MJD 60234.07666667 TDT (2023 Oct 17.0767) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1132023Oct09 Binary solution 1 : Kepler,17.60,2023,10,17,1.837941,0.138055,-0.374316,8.604477,3.182332,0.005789,0.001160,0.000000,0.000000 -114.2964,-31.0402,148.81,-9.10,False UCAC4-295-230688,19.88107693,-31.0996563,0.00,12.36,0.00,0.0,0,,19.90596210,-31.0401863,1.00,0.00,0,0,0 87,Sylvia #1,12.80,286.000,2.9940,0,2,1.967,9.35,,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, 0,339.8172,2023,10,16,264.4234,73.0125,10.8803,0.09386,3.47689,3.15053,6.97,5.0,0.15 1.016,0.0057,0.0011,88,0.0058,Known errors + binary orbit,-1.00,0,-1,-1 20231017_230688_Ma1,60232.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 20:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org