IOTA/IOTA-ES occultation update for (15518) 1999 VY153 / TYC 6849-01345-1 event on 2024 Oct 12, 00:26 UT Visible from Summary ------- On 2024 Oct 12 UT, the 10.661 km diameter asteroid (15518) 1999 VY153 will occult a 11.8 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 7.30 mag to 19.09 mag (the magnitude of the asteroid) for at most 0.390 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: 98 * date and approx. time of event: 2024 Oct 12, 00:23 - 2024 Oct 12, 00:29 * geocentric midpoint of event [JD]: 2460595.51862804 * magnitude of target star: 11.79 * magnitude drop [mag]: 7.30 * estimated maximum duration [s]: 0.390 * Moon: 62 % sunlit, 34° distance * Sun: 71° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.001", 99°) * approx speed of asteroid's shadow [km/s]: 27.1516 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6849-01345-1 by 15518 1999 VY153 on 2024 Oct 12 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 132 0 0 -35 35 8 0 23 54.6 1 124 45 -35 39 52 -35 30 23 -35 43 6 -35 27 10 .... 133 0 0 -36 9 2 0 23 54.7 2 123 45 -36 13 48 -36 4 17 -36 17 3 -36 1 3 0.78 134 0 0 -36 43 6 0 23 54.9 3 123 46 -36 47 53 -36 38 20 -36 51 8 -36 35 5 0.83 135 0 0 -37 17 17 0 23 55.2 4 122 46 -37 22 4 -37 12 29 -37 25 21 -37 9 14 0.85 136 0 0 -37 51 33 0 23 55.6 5 122 46 -37 56 22 -37 46 45 -37 59 39 -37 43 29 0.86 137 0 0 -38 25 55 0 23 56.1 6 121 47 -38 30 45 -38 21 6 -38 34 2 -38 17 49 0.87 138 0 0 -39 0 20 0 23 56.7 6 120 47 -39 5 11 -38 55 30 -39 8 29 -38 52 12 0.88 139 0 0 -39 34 47 0 23 57.3 7 120 47 -39 39 39 -39 29 56 -39 42 57 -39 26 38 0.88 140 0 0 -40 9 15 0 23 58.1 8 119 47 -40 14 7 -40 4 23 -40 17 27 -40 1 4 0.89 141 0 0 -40 43 42 0 23 58.9 9 118 48 -40 48 35 -40 38 49 -40 51 55 -40 35 30 0.89 142 0 0 -41 18 7 0 23 59.8 10 118 48 -41 23 1 -41 13 14 -41 26 22 -41 9 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0 0 -39 58 22 0 29 43.3 4 237 -43 -40 3 14 -39 53 31 -40 6 33 -39 50 12 1.09 - 8 0 0 -39 23 58 0 29 43.6 3 236 -43 -39 28 49 -39 19 7 -39 32 7 -39 15 49 1.15 - 7 0 0 -38 49 35 0 29 43.8 2 236 -44 -38 54 25 -38 44 45 -38 57 43 -38 41 28 1.28 - 6 0 0 -38 15 14 0 29 44.0 1 235 -44 -38 20 3 -38 10 25 -38 23 21 -38 7 9 1.67 - 5 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -37 49 2 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6849-01345-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 57 55.0993 DE: -27 29 16.094 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 57 55.0990 DE: -27 29 16.094 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (15518) 1999 VY153 asteroid class: approx. diameter [km]: 11 approx. diameter ["]: 0.005 distance from Earth [AU]: 3.05320 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#48 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): 0.012", 0.001", 98.817° remarks: * orbital elements for (15518)1999 VY153 : Mean anomaly = 92.0567686003 deg Arg. of pericenter = 99.3795922547 deg Long. of node = 79.4069932901 deg Inclination = 8.7267500521 deg Eccentricity = 0.1619952775 Semimajor axis = 2.7948545152 AU Perihelion dist = 2.3421012825 AU Mag: H = 13.40, G = 0.15 Epoch of elements : MJD 60595.01862804 TDT (2024 Oct 12.0186) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482023Apr25,0.39,2024,10,12,0.447073,-0.016977,-0.666463,15.319818,-0.403693,0.005452,-0.000140,-0.000001,0.000000 -117.9201,-27.4916,169.92,-7.51,False TYC 6849-01345-1,17.96530539,-27.4878039,12.21,11.79,11.56,0.0,0,,17.99105486,-27.4915914,7.30,7.08,0,0,0 15518,1999 VY153,19.09,10.661,3.0532,0,0,3.317,-1.16,,1.2,0 0,91.8419,2024,10,11,99.3796,79.4070,8.7268,0.16200,2.79485,2.34210,13.40,5.0,0.15 1.341,0.0120,0.0006,99,0.0016,Known errors,0.94,0,-1,-1 20241012_1345-1,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org