IOTA/IOTA-ES occultation update for (15518) 1999 VY153 / UCAC4 344-121180 event on 2024 Apr 07, 18:29 UT Visible from Summary ------- On 2024 Apr 07 UT, the 10.6184627629044 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 6.30 mag to 18.09 mag (the magnitude of the asteroid) for at most 1.370 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: 96 * date and approx. time of event: 2024 Apr 07, 18:16 - 2024 Apr 07, 18:43 * geocentric midpoint of event [JD]: 2460408.27074575 * magnitude of target star: 11.79 * magnitude drop [mag]: 6.30 * estimated maximum duration [s]: 1.370 * Moon: 2 % sunlit, 94° distance * Sun: 108° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 3.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.003", 100°) * approx speed of asteroid's shadow [km/s]: 7.8706 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 344-121180 by 15518 1999 VY153 on 2024 Apr 7 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 79 0 0 23 13 29 18 16 34.4 0 113 -59 23 10 17 23 16 42 23 7 40 .. .. .. .... 80 0 0 22 49 28 18 16 34.6 1 114 -59 22 46 15 22 52 41 22 43 38 22 55 19 0.06 81 0 0 22 25 7 18 16 34.9 2 114 -60 22 21 53 22 28 20 22 19 16 22 30 58 -0.05 82 0 0 22 0 25 18 16 35.6 3 114 -61 21 57 11 22 3 39 21 54 33 22 6 17 -0.08 83 0 0 21 35 23 18 16 36.5 4 115 -61 21 32 9 21 38 37 21 29 31 21 41 15 -0.10 84 0 0 21 10 2 18 16 37.6 5 115 -62 21 6 47 21 13 16 21 4 9 21 15 55 -0.11 85 0 0 20 44 21 18 16 39.1 6 116 -62 20 41 6 20 47 36 20 38 28 20 50 15 -0.11 86 0 0 20 18 22 18 16 40.8 7 116 -63 20 15 7 20 21 37 20 12 28 20 24 16 -0.12 87 0 0 19 52 4 18 16 42.8 8 116 -63 19 48 49 19 55 20 19 46 10 19 57 59 -0.12 88 0 0 19 25 29 18 16 45.1 9 117 -63 19 22 13 19 28 44 19 19 34 19 31 24 -0.13 89 0 0 18 58 36 18 16 47.6 10 117 -64 18 55 20 19 1 52 18 52 40 19 4 31 -0.13 90 0 0 18 31 26 18 16 50.5 11 117 -64 18 28 9 18 34 42 18 25 29 18 37 22 -0.13 91 0 0 18 3 59 18 16 53.6 12 118 -64 18 0 43 18 7 16 17 58 3 18 9 56 -0.13 92 0 0 17 36 17 18 16 57.0 14 118 -65 17 33 0 17 39 34 17 30 20 17 42 14 -0.13 93 0 0 17 8 19 18 17 0.8 15 118 -65 17 5 2 17 11 36 17 2 22 17 14 17 -0.13 94 0 0 16 40 7 18 17 4.8 16 118 -65 16 36 50 16 43 24 16 34 9 16 46 5 -0.13 95 0 0 16 11 40 18 17 9.1 17 119 -65 16 8 23 16 14 58 16 5 42 16 17 39 -0.14 96 0 0 15 43 0 18 17 13.8 18 119 -65 15 39 43 15 46 18 15 37 2 15 48 59 -0.14 97 0 0 15 14 7 18 17 18.7 19 119 -65 15 10 50 15 17 25 15 8 8 15 20 7 -0.14 98 0 0 14 45 3 18 17 23.9 20 120 -65 14 41 45 14 48 21 14 39 3 14 51 2 -0.14 99 0 0 14 15 46 18 17 29.5 21 120 -65 14 12 28 14 19 5 14 9 47 14 21 46 -0.14 100 0 0 13 46 19 18 17 35.4 22 120 -65 13 43 1 13 49 38 13 40 19 13 52 19 -0.14 101 0 0 13 16 42 18 17 41.5 23 120 -65 13 13 24 13 20 1 13 10 42 13 22 43 -0.14 102 0 0 12 46 56 18 17 48.0 24 121 -65 12 43 38 12 50 15 12 40 56 12 52 57 -0.14 103 0 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0 59 -0.15 -123 0 0 - 7 45 55 18 43 2.7 8 249 63 - 7 49 3 - 7 42 47 - 7 51 36 - 7 40 14 -0.15 -122 0 0 - 7 24 49 18 43 4.7 7 249 64 - 7 27 57 - 7 21 40 - 7 30 30 - 7 19 7 -0.15 -121 0 0 - 7 3 20 18 43 6.4 6 249 65 - 7 6 29 - 7 0 12 - 7 9 2 - 6 57 38 -0.15 -120 0 0 - 6 41 30 18 43 7.9 5 249 66 - 6 44 39 - 6 38 21 - 6 47 13 - 6 35 47 -0.14 -119 0 0 - 6 19 19 18 43 9.1 4 249 67 - 6 22 28 - 6 16 10 - 6 25 3 - 6 13 36 -0.14 -118 0 0 - 5 56 48 18 43 10.0 3 249 68 - 5 59 57 - 5 53 38 - 6 2 32 - 5 51 4 -0.14 -117 0 0 - 5 33 56 18 43 10.6 2 249 69 - 5 37 6 - 5 30 46 - 5 39 41 - 5 28 12 -0.13 -116 0 0 - 5 10 45 18 43 10.9 1 249 70 - 5 13 55 - 5 7 35 - 5 16 30 - 5 5 0 -0.08 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 344-121180 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 58 45.3422 DE: -21 17 22.295 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 58 45.3422 DE: -21 17 22.295 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 13.1 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (15518) 1999 VY153 asteroid class: approx. diameter [km]: 11 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.07560 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): 0.018", 0.003", 100.4° remarks: * orbital elements for (15518)1999 VY153 : Mean anomaly = 52.5283617134 deg Arg. of pericenter = 99.4219960210 deg Long. of node = 79.4068225994 deg Inclination = 8.7265073458 deg Eccentricity = 0.1619241862 Semimajor axis = 2.7951228923 AU Perihelion dist = 2.3425248925 AU Mag: H = 13.40, G = 0.15 Epoch of elements : MJD 60407.77074537 TDT (2024 Apr 07.7707) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482023Apr25,1.37,2024,4,7,18.497898,0.044533,0.164717,4.289515,-1.155449,-0.005406,-0.000068,0.000000,0.000000 156.0655,-21.2926,-96.99,7.22,False UCAC4 344-121180,17.97926169,-21.2895265,13.05,11.79,11.11,0.1,0,,18.00351716,-21.2926347,6.30,6.53,0,0,0 15518,1999 VY153,18.09,10.769,2.0756,0,0,1.300,-4.90,,1.2,0 0,52.3658,2024,4,7,99.4220,79.4068,8.7265,0.16192,2.79512,2.34252,13.40,5.0,0.15 1.407,0.0177,0.0025,100,0.0029,Known errors,0.87,0,-1,-1 20240407_121180,60139.28 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org