IOTA/IOTA-ES occultation update for (48462) 1991 RT6 / UCAC4 287-166797 event on 2024 Nov 04, 11:41 UT Visible from Summary ------- On 2024 Nov 04 UT, the 15.708 km diameter asteroid (48462) 1991 RT6 will occult a 11.5 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 7.41 mag to 18.86 mag (the magnitude of the asteroid) for at most 0.430 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 04, 11:38 - 2024 Nov 04, 11:43 * geocentric midpoint of event [JD]: 2460618.98685054 * magnitude of target star: 11.45 * magnitude drop [mag]: 7.41 * estimated maximum duration [s]: 0.430 * Moon: 9 % sunlit, 18° distance * Sun: 52° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.002", 74°) * approx speed of asteroid's shadow [km/s]: 36.8973 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 287-166797 by 48462 1991 RT6 on 2024 Nov 4 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 - 37 0 0 - 5 56 11 11 38 12.9 1 123 51 - 6 1 18 - 5 51 4 - 6 3 53 - 5 48 29 .... - 36 0 0 - 6 34 37 11 38 13.0 2 123 52 - 6 39 43 - 6 29 31 - 6 42 17 - 6 26 57 -0.01 - 35 0 0 - 7 12 36 11 38 13.2 3 123 53 - 7 17 41 - 7 7 31 - 7 20 14 - 7 4 57 -0.06 - 34 0 0 - 7 50 6 11 38 13.4 4 123 55 - 7 55 10 - 7 45 2 - 7 57 43 - 7 42 28 -0.08 - 33 0 0 - 8 27 7 11 38 13.7 5 122 56 - 8 32 10 - 8 22 4 - 8 34 43 - 8 19 31 -0.09 - 32 0 0 - 9 3 38 11 38 14.1 7 122 57 - 9 8 40 - 8 58 36 - 9 11 12 - 8 56 3 -0.10 - 31 0 0 - 9 39 38 11 38 14.5 8 122 58 - 9 44 39 - 9 34 37 - 9 47 11 - 9 32 5 -0.11 - 30 0 0 -10 15 6 11 38 15.0 9 122 59 -10 20 6 -10 10 6 -10 22 37 -10 7 35 -0.11 - 29 0 0 -10 50 3 11 38 15.6 10 122 60 -10 55 1 -10 45 4 -10 57 32 -10 42 33 -0.11 - 28 0 0 -11 24 26 11 38 16.3 11 122 61 -11 29 24 -11 19 28 -11 31 54 -11 16 58 -0.12 - 27 0 0 -11 58 16 11 38 17.0 12 121 62 -12 3 13 -11 53 19 -12 5 42 -11 50 49 -0.12 - 26 0 0 -12 31 32 11 38 17.7 13 121 63 -12 36 27 -12 26 36 -12 38 57 -12 24 7 -0.12 - 25 0 0 -13 4 13 11 38 18.6 15 121 64 -13 9 8 -12 59 19 -13 11 36 -12 56 50 -0.12 - 24 0 0 -13 36 20 11 38 19.5 16 121 65 -13 41 13 -13 31 26 -13 43 41 -13 28 58 -0.12 - 23 0 0 -14 7 51 11 38 20.4 17 120 66 -14 12 43 -14 2 59 -14 15 11 -14 0 31 -0.13 - 22 0 0 -14 38 46 11 38 21.4 18 120 67 -14 43 38 -14 33 55 -14 46 5 -14 31 28 -0.13 - 21 0 0 -15 9 6 11 38 22.5 19 120 68 -15 13 56 -15 4 16 -15 16 22 -15 1 49 -0.13 - 20 0 0 -15 38 49 11 38 23.6 20 120 69 -15 43 38 -15 34 0 -15 46 4 -15 31 34 -0.13 - 19 0 0 -16 7 55 11 38 24.7 21 120 70 -16 12 43 -16 3 7 -16 15 9 -16 0 42 -0.13 - 18 0 0 -16 36 25 11 38 26.0 22 119 71 -16 41 12 -16 31 38 -16 43 37 -16 29 13 -0.13 - 17 0 0 -17 4 18 11 38 27.2 23 119 72 -17 9 4 -16 59 32 -17 11 28 -16 57 8 -0.13 - 16 0 0 -17 31 34 11 38 28.5 24 119 73 -17 36 18 -17 26 49 -17 38 42 -17 24 25 -0.13 - 15 0 0 -17 58 12 11 38 29.9 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53 47 -0.14 95 0 0 - 6 22 58 11 43 5.5 44 229 -3 - 6 28 5 - 6 17 51 - 6 30 40 - 6 15 16 -0.14 96 0 0 - 5 44 1 11 43 8.0 43 229 -4 - 5 49 9 - 5 38 52 - 5 51 44 - 5 36 17 -0.14 97 0 0 - 5 4 36 11 43 10.5 42 229 -5 - 5 9 45 - 4 59 27 - 5 12 21 - 4 56 51 -0.14 98 0 0 - 4 24 45 11 43 12.9 41 230 -6 - 4 29 55 - 4 19 35 - 4 32 32 - 4 16 59 -0.14 99 0 0 - 3 44 30 11 43 15.3 39 230 -8 - 3 49 41 - 3 39 19 - 3 52 18 - 3 36 42 -0.14 100 0 0 - 3 3 52 11 43 17.6 38 230 -9 - 3 9 3 - 2 58 40 - 3 11 41 - 2 56 2 -0.14 101 0 0 - 2 22 51 11 43 19.9 37 230 -10 - 2 28 3 - 2 17 38 - 2 30 41 - 2 15 0 -0.14 102 0 0 - 1 41 29 11 43 22.1 36 230 -11 - 1 46 42 - 1 36 16 - 1 49 20 - 1 33 38 -0.14 103 0 0 - 0 59 48 11 43 24.2 35 230 -12 - 1 5 2 - 0 54 34 - 1 7 40 - 0 51 55 -0.14 104 0 0 - 0 17 48 11 43 26.3 33 230 -13 - 0 23 3 - 0 12 33 - 0 25 42 - 0 9 54 -0.14 105 0 0 0 24 28 11 43 28.3 32 230 -15 0 19 13 0 29 44 0 16 34 0 32 23 -0.14 106 0 0 1 7 0 11 43 30.3 31 230 -16 1 1 44 1 12 16 0 59 4 1 14 55 -0.14 107 0 0 1 49 45 11 43 32.2 30 230 -17 1 44 29 1 55 2 1 41 49 1 57 41 -0.14 108 0 0 2 32 43 11 43 34.0 28 230 -18 2 27 25 2 38 0 2 24 46 2 40 40 -0.13 109 0 0 3 15 51 11 43 35.7 27 230 -19 3 10 33 3 21 8 3 7 53 3 23 49 -0.13 110 0 0 3 59 8 11 43 37.4 26 230 -20 3 53 50 4 4 26 3 51 9 4 7 6 -0.13 111 0 0 4 42 32 11 43 39.0 25 231 -21 4 37 14 4 47 51 4 34 33 4 50 31 -0.13 112 0 0 5 26 3 11 43 40.6 23 231 -23 5 20 44 5 31 21 5 18 3 5 34 2 -0.13 113 0 0 6 9 37 11 43 42.0 22 231 -24 6 4 18 6 14 56 6 1 37 6 17 37 -0.13 114 0 0 6 53 14 11 43 43.4 21 231 -25 6 47 55 6 58 33 6 45 13 7 1 14 -0.13 115 0 0 7 36 51 11 43 44.7 20 231 -26 7 31 32 7 42 10 7 28 51 7 44 52 -0.13 116 0 0 8 20 28 11 43 46.0 19 231 -27 8 15 8 8 25 47 8 12 27 8 28 28 -0.13 117 0 0 9 4 2 11 43 47.1 17 231 -28 8 58 42 9 9 21 8 56 1 9 12 2 -0.13 118 0 0 9 47 31 11 43 48.2 16 232 -29 9 42 12 9 52 51 9 39 31 9 55 32 -0.13 119 0 0 10 30 55 11 43 49.2 15 232 -31 10 25 36 10 36 15 10 22 55 10 38 56 -0.13 120 0 0 11 14 11 11 43 50.1 14 232 -32 11 8 52 11 19 31 11 6 11 11 22 12 -0.13 121 0 0 11 57 19 11 43 50.9 12 232 -33 11 51 59 12 2 38 11 49 18 12 5 19 -0.13 122 0 0 12 40 15 11 43 51.7 11 232 -34 12 34 56 12 45 34 12 32 15 12 48 15 -0.13 123 0 0 13 22 59 11 43 52.4 10 233 -35 13 17 41 13 28 18 13 15 0 13 30 59 -0.13 124 0 0 14 5 30 11 43 53.0 9 233 -36 14 0 11 14 10 48 13 57 31 14 13 29 -0.13 125 0 0 14 47 45 11 43 53.5 8 233 -37 14 42 27 14 53 3 14 39 47 14 55 44 -0.12 126 0 0 15 29 44 11 43 53.9 6 233 -38 15 24 26 15 35 1 15 21 46 15 37 42 -0.12 127 0 0 16 11 24 11 43 54.3 5 234 -39 16 6 7 16 16 42 16 3 27 16 19 22 -0.12 128 0 0 16 52 45 11 43 54.6 4 234 -40 16 47 29 16 58 2 16 44 49 17 0 42 -0.11 129 0 0 17 33 46 11 43 54.8 3 234 -41 17 28 30 17 39 2 17 25 50 17 41 42 -0.10 130 0 0 18 14 24 11 43 54.9 2 235 -42 18 9 9 18 19 40 18 6 30 18 22 19 -0.08 131 0 0 18 54 40 11 43 55.0 1 235 -43 18 49 25 18 59 55 18 46 46 19 2 34 0.03 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 287-166797 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 16 52.6332 DE: -32 46 34.114 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 16 52.6332 DE: -32 46 34.114 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.5 * B mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (48462) 1991 RT6 asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.006 distance from Earth [AU]: 3.48870 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", 74.257° remarks: * orbital elements for (48462)1991 RT6 : Mean anomaly = 41.6695844018 deg Arg. of pericenter = 277.8111583701 deg Long. of node = 320.7952235447 deg Inclination = 20.2252139457 deg Eccentricity = 0.0849985099 Semimajor axis = 3.1726333942 AU Perihelion dist = 2.9029642834 AU Mag: H = 12.93, G = 0.15 Epoch of elements : MJD 60618.48685026 TDT (2024 Nov 04.4869) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr25,0.43,2024,11,4,11.684413,-0.036910,0.138150,20.141895,5.293371,0.004638,-0.000453,-0.000001,0.000000 55.1439,-32.7688,0.63,-15.60,False UCAC4 287-166797,18.28128706,-32.7761429,12.04,11.45,11.13,0.0,0,,18.30808220,-32.7688439,7.41,7.28,0,0,0 48462,1991 RT6,18.86,15.708,3.4887,0,0,4.026,13.35,,1.4,0 0,41.5847,2024,11,4,277.8112,320.7952,20.2252,0.08500,3.17263,2.90296,12.93,5.0,0.15 1.252,0.0183,0.0015,74,0.0016,Known errors,0.72,0,-1,-1 20241104_166797,60140.68 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org