IOTA/IOTA-ES occultation update for (8499) 1990 SC13 / G193037.0-210800 event on 2024 Oct 18, 23:15 UT Visible from Summary ------- On 2024 Oct 18 UT, the 8.59750546395387 km diameter asteroid (8499) 1990 SC13 will occult a 9.2 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 9.53 mag to 18.72 mag (the magnitude of the asteroid) for at most 1.070 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: 2024 Oct 18, 23:09 - 2024 Oct 18, 23:20 * geocentric midpoint of event [JD]: 2460602.46885120 * magnitude of target star: 9.19 * magnitude drop [mag]: 0.74 * estimated maximum duration [s]: 1.070 * Moon: 96 % sunlit, 116° distance * Sun: 85° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 80°) * approx speed of asteroid's shadow [km/s]: 19.4069 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of G193037.0-210800 by 8499 1990 SC13 on 2024 Oct 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 -174 0 0 - 6 48 58 23 9 40.4 1 111 86 - 6 55 1 - 6 42 55 - 6 56 55 - 6 41 1 - 6 47 51 - 6 50 5 .... -173 0 0 - 7 12 1 23 9 40.5 2 111 87 - 7 18 4 - 7 5 58 - 7 19 58 - 7 4 5 - 7 10 55 - 7 13 8 0.05 -172 0 0 - 7 34 53 23 9 40.8 3 111 87 - 7 40 55 - 7 28 50 - 7 42 49 - 7 26 56 - 7 33 46 - 7 35 59 0.02 -171 0 0 - 7 57 32 23 9 41.2 4 111 88 - 8 3 34 - 7 51 29 - 8 5 27 - 7 49 36 - 7 56 25 - 7 58 38 0.01 -170 0 0 - 8 19 58 23 9 41.6 5 111 88 - 8 25 59 - 8 13 56 - 8 27 53 - 8 12 2 - 8 18 51 - 8 21 4 0.00 -169 0 0 - 8 42 10 23 9 42.2 6 110 87 - 8 48 12 - 8 36 9 - 8 50 5 - 8 34 16 - 8 41 4 - 8 43 17 0.00 -168 0 0 - 9 4 9 23 9 43.0 7 110 87 - 9 10 10 - 8 58 8 - 9 12 3 - 8 56 15 - 9 3 3 - 9 5 15 0.00 -167 0 0 - 9 25 54 23 9 43.8 8 110 86 - 9 31 54 - 9 19 53 - 9 33 47 - 9 18 0 - 9 24 48 - 9 27 0 -0.01 -166 0 0 - 9 47 24 23 9 44.7 9 110 85 - 9 53 24 - 9 41 24 - 9 55 16 - 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1 43 17 - 1 57 27 - 1 41 22 - 1 48 17 - 1 50 32 -0.02 - 26 0 0 - 1 24 5 23 19 55.0 29 246 -56 - 1 30 13 - 1 17 58 - 1 32 8 - 1 16 2 - 1 22 58 - 1 25 13 -0.02 - 25 0 0 - 0 58 42 23 19 58.0 28 246 -57 - 1 4 50 - 0 52 34 - 1 6 45 - 0 50 39 - 0 57 34 - 0 59 49 -0.02 - 24 0 0 - 0 33 15 23 20 1.0 27 246 -58 - 0 39 23 - 0 27 7 - 0 41 18 - 0 25 12 - 0 32 8 - 0 34 23 -0.02 - 23 0 0 - 0 7 46 23 20 3.8 26 246 -59 - 0 13 54 - 0 1 38 - 0 15 49 0 0 17 - 0 6 38 - 0 8 53 -0.02 - 22 0 0 0 17 46 23 20 6.5 25 246 -60 0 11 38 0 23 54 0 9 43 0 25 49 0 18 53 0 16 38 -0.02 - 21 0 0 0 43 19 23 20 9.1 24 246 -61 0 37 11 0 49 27 0 35 15 0 51 22 0 44 26 0 42 11 -0.02 - 20 0 0 1 8 53 23 20 11.6 23 247 -62 1 2 45 1 15 1 1 0 49 1 16 56 1 10 0 1 7 45 -0.02 - 19 0 0 1 34 27 23 20 14.0 22 247 -64 1 28 18 1 40 35 1 26 23 1 42 30 1 35 34 1 33 19 -0.02 - 18 0 0 2 0 0 23 20 16.2 21 247 -65 1 53 52 2 6 8 1 51 57 2 8 3 2 1 7 1 58 52 -0.02 - 17 0 0 2 25 32 23 20 18.4 20 247 -66 2 19 24 2 31 40 2 17 29 2 33 35 2 26 40 2 24 25 -0.02 - 16 0 0 2 51 3 23 20 20.4 18 247 -67 2 44 55 2 57 11 2 42 59 2 59 6 2 52 10 2 49 55 -0.02 - 15 0 0 3 16 31 23 20 22.3 17 247 -68 3 10 23 3 22 38 3 8 27 3 24 34 3 17 38 3 15 23 -0.02 - 14 0 0 3 41 55 23 20 24.2 16 247 -69 3 35 48 3 48 3 3 33 52 3 49 58 3 43 3 3 40 48 -0.02 - 13 0 0 4 7 17 23 20 25.8 15 247 -70 4 1 9 4 13 24 3 59 14 4 15 19 4 8 24 4 6 9 -0.01 - 12 0 0 4 32 33 23 20 27.4 14 247 -71 4 26 26 4 38 41 4 24 31 4 40 36 4 33 41 4 31 26 -0.01 - 11 0 0 4 57 45 23 20 28.9 13 247 -72 4 51 38 5 3 53 4 49 43 5 5 48 4 58 53 4 56 38 -0.01 - 10 0 0 5 22 51 23 20 30.2 12 247 -73 5 16 44 5 28 59 5 14 49 5 30 54 5 23 59 5 21 44 -0.01 - 9 0 0 5 47 51 23 20 31.4 11 247 -74 5 41 45 5 53 58 5 39 50 5 55 53 5 48 59 5 46 44 -0.01 - 8 0 0 6 12 45 23 20 32.5 10 247 -75 6 6 38 6 18 51 6 4 43 6 20 46 6 13 52 6 11 37 -0.01 - 7 0 0 6 37 31 23 20 33.5 9 247 -77 6 31 24 6 43 37 6 29 29 6 45 32 6 38 38 6 36 23 -0.01 - 6 0 0 7 2 8 23 20 34.4 8 248 -78 6 56 2 7 8 15 6 54 8 7 10 10 7 3 16 7 1 1 -0.01 - 5 0 0 7 26 38 23 20 35.2 7 248 -79 7 20 32 7 32 44 7 18 37 7 34 39 7 27 45 7 25 31 0.00 - 4 0 0 7 50 58 23 20 35.8 5 248 -80 7 44 53 7 57 4 7 42 58 7 58 59 7 52 5 7 49 51 0.00 - 3 0 0 8 15 9 23 20 36.3 4 248 -81 8 9 4 8 21 14 8 7 9 8 23 9 8 16 16 8 14 2 0.00 - 2 0 0 8 39 10 23 20 36.7 3 248 -82 8 33 5 8 45 15 8 31 10 8 47 9 8 40 16 8 38 3 0.01 - 1 0 0 9 3 0 23 20 37.0 2 248 -83 8 56 55 9 9 4 8 55 1 9 10 59 9 4 6 9 1 53 0.03 0 0 0 9 26 38 23 20 37.2 1 248 -84 9 20 34 9 32 43 9 18 40 9 34 37 9 27 45 9 25 31 0.08 1 0 0 9 50 5 23 20 37.3 0 249 -85 9 44 1 9 56 9 9 42 7 9 58 3 9 51 12 9 48 59 1.01 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: G193037.0-210800 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 30 36.9889 DE: -21 08 00.389 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 30 36.9888 DE: -21 08 00.390 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.600,0.500) * V mag [mag]: 9.2 * B mag [mag]: 12.1 * Diameter [mas]: 6.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (8499) 1990 SC13 asteroid class: approx. diameter [km]: 9 approx. diameter ["]: 0.004 distance from Earth [AU]: 2.80780 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#43 date of fit: 2023 Apr 25 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): 0.015", 0.002", 80.32° remarks: * orbital elements for (8499)1990 SC13 : Mean anomaly = 78.9181632036 deg Arg. of pericenter = 325.1336867500 deg Long. of node = 265.9747004113 deg Inclination = 0.9078620979 deg Eccentricity = 0.0092550871 Semimajor axis = 2.9067592159 AU Perihelion dist = 2.8798569063 AU Mag: H = 13.17, G = 0.15 Epoch of elements : MJD 60601.96885112 TDT (2024 Oct 18.9689) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#432023Apr25,1.07,2024,10,18,23.252429,-0.004998,0.031048,10.827159,1.660904,0.005703,0.000901,0.000000,0.000000 -83.6968,-21.0824,-172.54,-10.07,False G193037.0-210800,19.51027472,-21.1334415,12.11,9.19,7.61,6.0,4,,19.53465771,-21.0824189,0.70,0.70,0,0,0 8499,1990 SC13,18.72,20.816,2.8078,0,0,2.423,5.21,,0.8,0 0,78.7255,2024,10,18,325.1337,265.9747,0.9079,0.00926,2.90676,2.87986,13.17,5.0,0.15 1.157,0.0150,0.0016,80,0.0016,Known errors,1.39,0,-1,-1 20241018_210800,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org