IOTA/IOTA-ES occultation update for (25270) 1998 VR27 / TYC 6287-01595-1 event on 2024 Nov 13, 00:34 UT Visible from Summary ------- On 2024 Nov 13 UT, the 16.69 km diameter asteroid (25270) 1998 VR27 will occult a 11.0 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 8.06 mag to 19.05 mag (the magnitude of the asteroid) for at most 0.520 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 Nov 13, 00:31 - 2024 Nov 13, 00:37 * geocentric midpoint of event [JD]: 2460627.52378350 * magnitude of target star: 10.99 * magnitude drop [mag]: 8.06 * estimated maximum duration [s]: 0.520 * Moon: 88 % sunlit, 83° distance * Sun: 56° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 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", 79°) * approx speed of asteroid's shadow [km/s]: 32.1497 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6287-01595-1 by 25270 1998 VR27 on 2024 Nov 13 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 126 0 0 -32 36 24 0 31 20.7 0 112 49 -32 41 58 -32 30 51 -32 44 36 -32 28 13 .... 127 0 0 -32 56 35 0 31 20.8 1 111 50 -33 2 8 -32 51 2 -33 4 46 -32 48 24 0.46 128 0 0 -33 16 39 0 31 20.9 2 110 51 -33 22 12 -33 11 6 -33 24 50 -33 8 28 0.50 129 0 0 -33 36 35 0 31 21.0 3 110 52 -33 42 8 -33 31 2 -33 44 46 -33 28 25 0.52 130 0 0 -33 56 23 0 31 21.3 4 109 52 -34 1 56 -33 50 50 -34 4 34 -33 48 13 0.52 131 0 0 -34 16 2 0 31 21.5 5 109 53 -34 21 35 -34 10 30 -34 24 13 -34 7 53 0.53 132 0 0 -34 35 33 0 31 21.8 6 108 54 -34 41 5 -34 30 0 -34 43 43 -34 27 23 0.53 133 0 0 -34 54 54 0 31 22.2 6 108 54 -35 0 27 -34 49 22 -35 3 4 -34 46 45 0.53 134 0 0 -35 14 6 0 31 22.6 7 107 55 -35 19 38 -35 8 34 -35 22 15 -35 5 57 0.54 135 0 0 -35 33 7 0 31 23.1 8 107 56 -35 38 39 -35 27 36 -35 41 17 -35 24 59 0.54 136 0 0 -35 51 59 0 31 23.6 9 106 56 -35 57 30 -35 46 27 -36 0 7 -35 43 50 0.54 137 0 0 -36 10 39 0 31 24.2 10 105 57 -36 16 11 -36 5 8 -36 18 48 -36 2 31 0.54 138 0 0 -36 29 9 0 31 24.8 11 105 58 -36 34 40 -36 23 38 -36 37 17 -36 21 2 0.54 139 0 0 -36 47 27 0 31 25.5 12 104 58 -36 52 58 -36 41 57 -36 55 35 -36 39 20 0.54 140 0 0 -37 5 34 0 31 26.2 12 103 59 -37 11 5 -37 0 4 -37 13 41 -36 57 27 0.54 141 0 0 -37 23 29 0 31 26.9 13 103 59 -37 28 59 -37 17 59 -37 31 35 -37 15 23 0.54 142 0 0 -37 41 11 0 31 27.7 14 102 60 -37 46 41 -37 35 42 -37 49 17 -37 33 6 0.54 143 0 0 -37 58 41 0 31 28.6 15 102 60 -38 4 11 -37 53 12 -38 6 47 -37 50 36 0.54 144 0 0 -38 15 59 0 31 29.5 16 101 61 -38 21 28 -38 10 30 -38 24 4 -38 7 54 0.54 145 0 0 -38 33 3 0 31 30.4 17 100 61 -38 38 32 -38 27 35 -38 41 8 -38 24 59 0.54 146 0 0 -38 49 54 0 31 31.4 17 100 62 -38 55 23 -38 44 26 -38 57 59 -38 41 51 0.54 147 0 0 -39 6 32 0 31 32.4 18 99 62 -39 12 0 -39 1 4 -39 14 36 -38 58 29 0.54 148 0 0 -39 22 56 0 31 33.4 19 98 62 -39 28 24 -39 17 29 -39 30 59 -39 14 54 0.54 149 0 0 -39 39 7 0 31 34.5 20 98 63 -39 44 34 -39 33 40 -39 47 9 -39 31 5 0.54 150 0 0 -39 55 3 0 31 35.6 21 97 63 -40 0 30 -39 49 36 -40 3 5 -39 47 2 0.55 151 0 0 -40 10 45 0 31 36.8 22 96 63 -40 16 12 -40 5 19 -40 18 46 -40 2 44 0.55 152 0 0 -40 26 13 0 31 38.0 22 95 64 -40 31 39 -40 20 47 -40 34 13 -40 18 13 0.55 153 0 0 -40 41 26 0 31 39.2 23 95 64 -40 46 51 -40 36 0 -40 49 26 -40 33 26 0.55 154 0 0 -40 56 24 0 31 40.5 24 94 64 -41 1 49 -40 50 59 -41 4 23 -40 48 25 0.55 155 0 0 -41 11 7 0 31 41.8 25 93 64 -41 16 32 -41 5 43 -41 19 6 -41 3 9 0.55 156 0 0 -41 25 36 0 31 43.1 25 92 64 -41 31 0 -41 20 11 -41 33 34 -41 17 38 0.55 157 0 0 -41 39 49 0 31 44.5 26 92 65 -41 45 13 -41 34 25 -41 47 46 -41 31 52 0.55 158 0 0 -41 53 47 0 31 45.9 27 91 65 -41 59 10 -41 48 24 -42 1 44 -41 45 51 0.55 159 0 0 -42 7 29 0 31 47.3 28 90 65 -42 12 53 -42 2 7 -42 15 26 -41 59 34 0.55 160 0 0 -42 20 57 0 31 48.7 28 89 65 -42 26 19 -42 15 34 -42 28 52 -42 13 2 0.55 161 0 0 -42 34 8 0 31 50.2 29 89 65 -42 39 30 -42 28 46 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-27 24 37 -27 13 30 -27 27 15 -27 10 52 0.58 - 51 0 0 -26 57 49 0 37 1.6 14 257 -32 -27 3 22 -26 52 16 -27 6 0 -26 49 38 0.58 - 50 0 0 -26 36 35 0 37 2.5 14 256 -33 -26 42 8 -26 31 2 -26 44 46 -26 28 25 0.58 - 49 0 0 -26 15 23 0 37 3.4 13 256 -34 -26 20 56 -26 9 51 -26 23 34 -26 7 13 0.58 - 48 0 0 -25 54 13 0 37 4.2 12 255 -35 -25 59 46 -25 48 41 -26 2 24 -25 46 4 0.59 - 47 0 0 -25 33 6 0 37 5.0 11 255 -35 -25 38 39 -25 27 34 -25 41 16 -25 24 57 0.59 - 46 0 0 -25 12 2 0 37 5.6 10 254 -36 -25 17 34 -25 6 30 -25 20 11 -25 3 53 0.59 - 45 0 0 -24 51 1 0 37 6.3 9 254 -37 -24 56 33 -24 45 29 -24 59 10 -24 42 52 0.60 - 44 0 0 -24 30 5 0 37 6.8 8 253 -38 -24 35 37 -24 24 33 -24 38 14 -24 21 56 0.60 - 43 0 0 -24 9 13 0 37 7.3 7 253 -39 -24 14 44 -24 3 42 -24 17 21 -24 1 5 0.61 - 42 0 0 -23 48 26 0 37 7.7 6 253 -40 -23 53 58 -23 42 55 -23 56 34 -23 40 19 0.62 - 41 0 0 -23 27 45 0 37 8.1 5 252 -41 -23 33 16 -23 22 15 -23 35 53 -23 19 38 0.64 - 40 0 0 -23 7 11 0 37 8.4 4 252 -41 -23 12 42 -23 1 41 -23 15 18 -22 59 4 0.66 - 39 0 0 -22 46 43 0 37 8.6 3 251 -42 -22 52 13 -22 41 13 -22 54 50 -22 38 37 0.69 - 38 0 0 -22 26 22 0 37 8.8 2 251 -43 -22 31 52 -22 20 53 -22 34 29 -22 18 17 0.77 - 37 0 0 -22 6 10 0 37 8.9 1 251 -44 -22 11 39 -22 0 40 -22 14 15 -21 58 4 1.02 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 6287-01595-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 11 45.6544 DE: -18 14 25.120 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 11 45.6541 DE: -18 14 25.121 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.0 * B mag [mag]: 11.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (25270) 1998 VR27 asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.006 distance from Earth [AU]: 3.86020 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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", 78.885° remarks: * orbital elements for (25270)1998 VR27 : Mean anomaly = 145.4276519515 deg Arg. of pericenter = 270.4709563210 deg Long. of node = 239.3360756635 deg Inclination = 5.3171907505 deg Eccentricity = 0.1008639898 Semimajor axis = 3.1430052999 AU Perihelion dist = 2.8259892456 AU Mag: H = 12.65, G = 0.15 Epoch of elements : MJD 60627.02378354 TDT (2024 Nov 13.0238) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr25,0.52,2024,11,13,0.570804,0.048188,-0.475748,18.056298,1.803803,0.004885,0.000859,-0.000001,0.000000 -132.8895,-18.1998,167.51,-18.04,False TYC 6287-01595-1,19.19601514,-18.2403110,11.29,10.99,10.83,0.0,0,,19.21987721,-18.1998131,8.06,7.77,0,0,0 25270,1998 VR27,19.05,16.690,3.8602,0,0,2.887,4.11,,1.2,0 0,145.2466,2024,11,12,270.4710,239.3361,5.3172,0.10086,3.14301,2.82599,12.65,5.0,0.15 1.237,0.0120,0.0009,79,0.0014,Known errors,0.79,0,-1,-1 20241113_1595-1,60140.70 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org