IOTA/IOTA-ES occultation update for (48462) 1991 RT6 / UCAC4 290-189245 event on 2024 Nov 12, 12:42 UT Visible from Summary ------- On 2024 Nov 12 UT, the 15.4715850888208 km diameter asteroid (48462) 1991 RT6 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 7.06 mag to 18.87 mag (the magnitude of the asteroid) for at most 0.410 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 12, 12:40 - 2024 Nov 12, 12:44 * geocentric midpoint of event [JD]: 2460627.02966508 * magnitude of target star: 11.81 * magnitude drop [mag]: 7.06 * estimated maximum duration [s]: 0.410 * Moon: 85 % sunlit, 88° distance * Sun: 47° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.29 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.002", 72°) * approx speed of asteroid's shadow [km/s]: 38.8231 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 290-189245 by 48462 1991 RT6 on 2024 Nov 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 - 88 0 0 -41 44 19 12 40 31.5 0 135 24 -41 51 53 .. .. .. -41 56 15 .. .. .. .... - 87 0 0 -42 29 27 12 40 31.5 1 134 24 -42 37 2 -42 21 53 -42 41 24 -42 17 32 0.62 - 86 0 0 -43 14 13 12 40 31.6 2 134 25 -43 21 49 -43 6 39 -43 26 12 -43 2 17 0.68 - 85 0 0 -43 58 36 12 40 31.8 3 133 26 -44 6 12 -43 51 1 -44 10 35 -43 46 39 0.71 - 84 0 0 -44 42 32 12 40 32.0 4 132 27 -44 50 9 -44 34 57 -44 54 33 -44 30 35 0.72 - 83 0 0 -45 26 2 12 40 32.3 5 132 27 -45 33 39 -45 18 26 -45 38 3 -45 14 4 0.73 - 82 0 0 -46 9 2 12 40 32.7 6 131 28 -46 16 39 -46 1 26 -46 21 3 -45 57 3 0.73 - 81 0 0 -46 51 31 12 40 33.1 7 130 29 -46 59 8 -46 43 55 -47 3 32 -46 39 32 0.73 - 80 0 0 -47 33 27 12 40 33.6 8 129 29 -47 41 4 -47 25 51 -47 45 28 -47 21 28 0.74 - 79 0 0 -48 14 49 12 40 34.1 9 129 30 -48 22 26 -48 7 13 -48 26 50 -48 2 51 0.74 - 78 0 0 -48 55 36 12 40 34.7 10 128 30 -49 3 12 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39 -41 15 9 -40 51 18 0.76 107 0 0 -40 17 4 12 44 21.0 33 253 -11 -40 24 37 -40 9 32 -40 28 59 -40 5 12 0.76 108 0 0 -39 30 40 12 44 23.0 32 252 -12 -39 38 12 -39 23 9 -39 42 33 -39 18 50 0.77 109 0 0 -38 44 2 12 44 25.1 31 252 -13 -38 51 33 -38 36 33 -38 55 53 -38 32 14 0.77 110 0 0 -37 57 13 12 44 27.1 30 251 -14 -38 4 42 -37 49 45 -38 9 1 -37 45 27 0.77 111 0 0 -37 10 15 12 44 29.0 29 250 -15 -37 17 42 -37 2 48 -37 22 0 -36 58 32 0.77 112 0 0 -36 23 10 12 44 30.9 28 249 -16 -36 30 36 -36 15 46 -36 34 53 -36 11 30 0.77 113 0 0 -35 36 1 12 44 32.8 26 248 -17 -35 43 25 -35 28 39 -35 47 41 -35 24 24 0.77 114 0 0 -34 48 51 12 44 34.6 25 247 -19 -34 56 12 -34 41 30 -35 0 28 -34 37 16 0.77 115 0 0 -34 1 41 12 44 36.3 24 247 -20 -34 9 0 -33 54 22 -34 13 14 -33 50 9 0.77 116 0 0 -33 14 34 12 44 37.9 23 246 -21 -33 21 51 -33 7 17 -33 26 4 -33 3 6 0.78 117 0 0 -32 27 32 12 44 39.5 22 245 -22 -32 34 47 -32 20 18 -32 38 59 -32 16 8 0.78 118 0 0 -31 40 38 12 44 41.1 21 245 -23 -31 47 51 -31 33 26 -31 52 1 -31 29 17 0.78 119 0 0 -30 53 54 12 44 42.5 20 244 -24 -31 1 5 -30 46 44 -31 5 14 -30 42 37 0.78 120 0 0 -30 7 23 12 44 43.9 19 243 -25 -30 14 31 -30 0 15 -30 18 38 -29 56 9 0.78 121 0 0 -29 21 5 12 44 45.2 18 243 -27 -29 28 11 -29 14 0 -29 32 17 -29 9 55 0.79 122 0 0 -28 35 4 12 44 46.5 17 242 -28 -28 42 7 -28 28 1 -28 46 12 -28 23 58 0.79 123 0 0 -27 49 21 12 44 47.6 15 242 -29 -27 56 22 -27 42 21 -28 0 25 -27 38 19 0.79 124 0 0 -27 3 59 12 44 48.7 14 241 -30 -27 10 57 -26 57 1 -27 14 58 -26 53 1 0.80 125 0 0 -26 18 58 12 44 49.7 13 241 -31 -26 25 54 -26 12 3 -26 29 54 -26 8 4 0.80 126 0 0 -25 34 22 12 44 50.6 12 240 -32 -25 41 15 -25 27 30 -25 45 14 -25 23 32 0.80 127 0 0 -24 50 12 12 44 51.4 11 240 -34 -24 57 2 -24 43 22 -25 0 59 -24 39 26 0.81 128 0 0 -24 6 29 12 44 52.2 10 239 -35 -24 13 16 -23 59 41 -24 17 12 -23 55 47 0.82 129 0 0 -23 23 14 12 44 52.9 9 239 -36 -23 30 0 -23 16 30 -23 33 54 -23 12 37 0.83 130 0 0 -22 40 31 12 44 53.4 7 238 -37 -22 47 13 -22 33 49 -22 51 6 -22 29 57 0.84 131 0 0 -21 58 19 12 44 53.9 6 238 -38 -22 4 59 -21 51 39 -22 8 50 -21 47 49 0.86 132 0 0 -21 16 40 12 44 54.4 5 238 -39 -21 23 18 -21 10 3 -21 27 7 -21 6 15 0.88 133 0 0 -20 35 36 12 44 54.7 4 237 -41 -20 42 11 -20 29 2 -20 45 59 -20 25 15 0.92 134 0 0 -19 55 7 12 44 54.9 3 237 -42 -20 1 40 -19 48 36 -20 5 26 -19 44 50 0.99 135 0 0 -19 15 15 12 44 55.1 2 237 -43 -19 21 45 -19 8 46 -19 25 30 -19 5 2 1.15 136 0 0 -18 36 1 12 44 55.2 0 236 -44 -18 42 28 -18 29 34 -18 46 12 -18 25 52 2.14 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 290-189245 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 29 57.4377 DE: -32 03 19.687 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 29 57.4377 DE: -32 03 19.687 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.6 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (48462) 1991 RT6 asteroid class: approx. diameter [km]: 15 approx. diameter ["]: 0.006 distance from Earth [AU]: 3.57680 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 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", 0.002", 72.373° remarks: * orbital elements for (48462)1991 RT6 : Mean anomaly = 43.0775350144 deg Arg. of pericenter = 277.8058799613 deg Long. of node = 320.7950178913 deg Inclination = 20.2253246510 deg Eccentricity = 0.0849944637 Semimajor axis = 3.1726047401 AU Perihelion dist = 2.9029509016 AU Mag: H = 12.93, G = 0.15 Epoch of elements : MJD 60626.52966479 TDT (2024 Nov 12.5297) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr25,0.41,2024,11,12,12.711962,0.151934,-0.575228,21.178397,5.625750,0.004264,-0.000393,-0.000001,0.000000 35.0704,-32.0403,-14.62,-17.91,False UCAC4 290-189245,18.49928831,-32.0554687,12.60,11.81,11.38,0.1,0,,18.52589429,-32.0403325,7.06,7.04,0,0,0 48462,1991 RT6,18.87,15.731,3.5768,0,0,4.095,13.84,,1.4,0 0,42.9852,2024,11,12,277.8059,320.7950,20.2253,0.08499,3.17260,2.90295,12.93,5.0,0.15 1.288,0.0180,0.0015,72,0.0017,Known errors,0.69,0,-1,-1 20241112_189245,60140.69 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org