IOTA/IOTA-ES occultation update for (48462) 1991 RT6 / UCAC4 275-112104 event on 2024 Oct 09, 11:45 UT Visible from Summary ------- On 2024 Oct 09 UT, the 15.689 km diameter asteroid (48462) 1991 RT6 will occult a 10.2 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.51 mag to 18.74 mag (the magnitude of the asteroid) for at most 0.530 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 Oct 09, 11:42 - 2024 Oct 09, 11:49 * geocentric midpoint of event [JD]: 2460592.99025296 * magnitude of target star: 10.23 * magnitude drop [mag]: 8.51 * estimated maximum duration [s]: 0.530 * Moon: 37 % sunlit, 9° distance * Sun: 69° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.42 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.002", 80°) * approx speed of asteroid's shadow [km/s]: 29.6273 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 275-112104 by 48462 1991 RT6 on 2024 Oct 9 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 - 43 0 0 -31 5 18 11 42 38.1 1 131 42 -31 11 27 -30 59 9 -31 16 35 -30 54 1 .... - 42 0 0 -31 51 2 11 42 38.2 2 131 43 -31 57 11 -31 44 54 -32 2 19 -31 39 46 0.40 - 41 0 0 -32 36 18 11 42 38.4 3 130 43 -32 42 26 -32 30 10 -32 47 34 -32 25 3 0.40 - 40 0 0 -33 21 4 11 42 38.7 4 130 43 -33 27 12 -33 14 57 -33 32 19 -33 9 50 0.41 - 39 0 0 -34 5 18 11 42 39.1 5 129 44 -34 11 26 -33 59 12 -34 16 33 -33 54 6 0.41 - 38 0 0 -34 49 0 11 42 39.6 7 128 44 -34 55 7 -34 42 54 -35 0 13 -34 37 48 0.41 - 37 0 0 -35 32 8 11 42 40.1 8 128 45 -35 38 13 -35 26 2 -35 43 19 -35 20 57 0.41 - 36 0 0 -36 14 40 11 42 40.8 9 127 45 -36 20 44 -36 8 35 -36 25 49 -36 3 31 0.41 - 35 0 0 -36 56 35 11 42 41.5 10 127 45 -37 2 39 -36 50 31 -37 7 43 -36 45 28 0.41 - 34 0 0 -37 37 53 11 42 42.2 11 126 46 -37 43 55 -37 31 50 -37 48 59 -37 26 47 0.41 - 33 0 0 -38 18 32 11 42 43.1 12 125 46 -38 24 33 -38 12 30 -38 29 36 -38 7 29 0.41 - 32 0 0 -38 58 31 11 42 44.0 13 125 46 -39 4 32 -38 52 31 -39 9 33 -38 47 30 0.41 - 31 0 0 -39 37 50 11 42 44.9 14 124 46 -39 43 50 -39 31 51 -39 48 50 -39 26 52 0.41 - 30 0 0 -40 16 29 11 42 45.9 15 123 46 -40 22 27 -40 10 31 -40 27 26 -40 5 32 0.41 - 29 0 0 -40 54 26 11 42 47.0 16 123 46 -41 0 22 -40 48 29 -41 5 21 -40 43 32 0.41 - 28 0 0 -41 31 41 11 42 48.1 17 122 47 -41 37 36 -41 25 45 -41 42 33 -41 20 49 0.41 - 27 0 0 -42 8 13 11 42 49.3 18 121 47 -42 14 7 -42 2 19 -42 19 3 -41 57 24 0.41 - 26 0 0 -42 44 3 11 42 50.5 19 121 47 -42 49 55 -42 38 11 -42 54 50 -42 33 17 0.41 - 25 0 0 -43 19 9 11 42 51.8 20 120 47 -43 25 0 -43 13 19 -43 29 54 -43 8 26 0.41 - 24 0 0 -43 53 33 11 42 53.1 21 119 47 -43 59 22 -43 47 44 -44 4 14 -43 42 53 0.41 - 23 0 0 -44 27 13 11 42 54.4 21 118 47 -44 33 1 -44 21 26 -44 37 52 -44 16 36 0.41 - 22 0 0 -45 0 11 11 42 55.8 22 118 47 -45 5 57 -44 54 25 -45 10 46 -44 49 36 0.41 - 21 0 0 -45 32 25 11 42 57.2 23 117 47 -45 38 9 -45 26 41 -45 42 57 -45 21 53 0.41 - 20 0 0 -46 3 56 11 42 58.6 24 116 47 -46 9 38 -45 58 13 -46 14 25 -45 53 27 0.41 - 19 0 0 -46 34 43 11 43 0.1 25 115 46 -46 40 24 -46 29 3 -46 45 10 -46 24 18 0.41 - 18 0 0 -47 4 49 11 43 1.6 26 115 46 -47 10 28 -46 59 10 -47 15 12 -46 54 27 0.41 - 17 0 0 -47 34 11 11 43 3.1 27 114 46 -47 39 49 -47 28 34 -47 44 31 -47 23 53 0.41 - 16 0 0 -48 2 52 11 43 4.6 27 113 46 -48 8 28 -47 57 16 -48 13 8 -47 52 36 0.41 - 15 0 0 -48 30 50 11 43 6.2 28 112 46 -48 36 24 -48 25 17 -48 41 4 -48 20 38 0.41 - 14 0 0 -48 58 8 11 43 7.7 29 111 46 -49 3 40 -48 52 36 -49 8 18 -48 47 59 0.41 - 13 0 0 -49 24 44 11 43 9.3 30 110 46 -49 30 14 -49 19 14 -49 34 51 -49 14 38 0.41 - 12 0 0 -49 50 39 11 43 10.9 31 109 45 -49 56 8 -49 45 11 -50 0 43 -49 40 37 0.41 - 11 0 0 -50 15 55 11 43 12.5 31 109 45 -50 21 21 -50 10 28 -50 25 55 -50 5 55 0.41 - 10 0 0 -50 40 30 11 43 14.2 32 108 45 -50 45 55 -50 35 5 -50 50 27 -50 30 34 0.41 - 9 0 0 -51 4 26 11 43 15.8 33 107 45 -51 9 50 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-31 28 42 11 48 18.6 41 249 -28 -31 34 53 -31 22 32 -31 40 3 -31 17 23 0.42 129 0 0 -30 42 10 11 48 21.7 40 248 -29 -30 48 21 -30 36 0 -30 53 31 -30 30 51 0.42 130 0 0 -29 55 11 11 48 24.7 39 247 -30 -30 1 23 -29 49 1 -30 6 33 -29 43 51 0.42 131 0 0 -29 7 47 11 48 27.7 38 246 -31 -29 13 59 -29 1 36 -29 19 9 -28 56 27 0.42 132 0 0 -28 20 0 11 48 30.6 37 246 -32 -28 26 11 -28 13 49 -28 31 22 -28 8 39 0.42 133 0 0 -27 31 52 11 48 33.5 36 245 -34 -27 38 3 -27 25 41 -27 43 14 -27 20 31 0.42 134 0 0 -26 43 24 11 48 36.3 34 244 -35 -26 49 36 -26 37 14 -26 54 46 -26 32 4 0.42 135 0 0 -25 54 40 11 48 39.0 33 244 -36 -26 0 51 -25 48 30 -26 6 1 -25 43 20 0.42 136 0 0 -25 5 41 11 48 41.7 32 243 -37 -25 11 52 -24 59 31 -25 17 2 -24 54 22 0.42 137 0 0 -24 16 30 11 48 44.3 31 242 -38 -24 22 41 -24 10 21 -24 27 50 -24 5 12 0.42 138 0 0 -23 27 9 11 48 46.8 30 242 -40 -23 33 19 -23 21 0 -23 38 28 -23 15 52 0.42 139 0 0 -22 37 41 11 48 49.3 28 241 -41 -22 43 50 -22 31 32 -22 48 59 -22 26 24 0.42 140 0 0 -21 48 7 11 48 51.6 27 241 -42 -21 54 15 -21 41 59 -21 59 23 -21 36 51 0.42 141 0 0 -20 58 30 11 48 53.9 26 240 -43 -21 4 37 -20 52 23 -21 9 45 -20 47 16 0.43 142 0 0 -20 8 52 11 48 56.1 25 240 -44 -20 14 59 -20 2 46 -20 20 6 -19 57 40 0.43 143 0 0 -19 19 16 11 48 58.2 24 239 -46 -19 25 22 -19 13 11 -19 30 28 -19 8 6 0.43 144 0 0 -18 29 45 11 49 0.2 22 239 -47 -18 35 49 -18 23 40 -18 40 54 -18 18 36 0.43 145 0 0 -17 40 19 11 49 2.0 21 238 -48 -17 46 23 -17 34 16 -17 51 27 -17 29 12 0.43 146 0 0 -16 51 2 11 49 3.8 20 238 -49 -16 57 5 -16 45 0 -17 2 8 -16 39 58 0.43 147 0 0 -16 1 57 11 49 5.5 19 238 -51 -16 7 58 -15 55 56 -16 13 0 -15 50 54 0.43 148 0 0 -15 13 4 11 49 7.1 17 237 -52 -15 19 4 -15 7 4 -15 24 5 -15 2 4 0.44 149 0 0 -14 24 26 11 49 8.6 16 237 -53 -14 30 25 -14 18 28 -14 35 25 -14 13 29 0.44 150 0 0 -13 36 6 11 49 9.9 15 237 -54 -13 42 3 -13 30 9 -13 47 2 -13 25 11 0.44 151 0 0 -12 48 5 11 49 11.2 14 237 -56 -12 54 1 -12 42 9 -12 58 58 -12 37 13 0.44 152 0 0 -12 0 25 11 49 12.3 12 236 -57 -12 6 19 -11 54 31 -12 11 16 -11 49 36 0.45 153 0 0 -11 13 8 11 49 13.3 11 236 -58 -11 19 1 -11 7 16 -11 23 56 -11 2 22 0.45 154 0 0 -10 26 16 11 49 14.3 10 236 -59 -10 32 7 -10 20 25 -10 37 1 -10 15 33 0.46 155 0 0 - 9 39 51 11 49 15.1 9 236 -61 - 9 45 40 - 9 34 2 - 9 50 33 - 9 29 10 0.46 156 0 0 - 8 53 54 11 49 15.8 7 236 -62 - 8 59 42 - 8 48 6 - 9 4 32 - 8 43 16 0.47 157 0 0 - 8 8 26 11 49 16.4 6 235 -63 - 8 14 13 - 8 2 41 - 8 19 2 - 7 57 52 0.48 158 0 0 - 7 23 30 11 49 16.8 5 235 -64 - 7 29 15 - 7 17 46 - 7 34 3 - 7 12 59 0.50 159 0 0 - 6 39 7 11 49 17.2 4 235 -66 - 6 44 50 - 6 33 24 - 6 49 36 - 6 28 38 0.54 160 0 0 - 5 55 17 11 49 17.5 2 235 -67 - 6 0 58 - 5 49 36 - 6 5 43 - 5 44 52 0.60 161 0 0 - 5 12 2 11 49 17.6 1 235 -68 - 5 17 42 - 5 6 24 - 5 22 25 - 5 1 40 0.81 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 275-112104 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 36 50.2508 DE: -35 00 07.804 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 36 50.2506 DE: -35 00 07.803 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.200) * V mag [mag]: 10.2 * B mag [mag]: 10.4 * 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 ["]: 0.007 distance from Earth [AU]: 3.16940 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): 0.020", 0.002", 80.337° remarks: * orbital elements for (48462)1991 RT6 : Mean anomaly = 37.1212843119 deg Arg. of pericenter = 277.8256855739 deg Long. of node = 320.7958809593 deg Inclination = 20.2249012191 deg Eccentricity = 0.0850108222 Semimajor axis = 3.1727142098 AU Perihelion dist = 2.9029991663 AU Mag: H = 12.93, G = 0.15 Epoch of elements : MJD 60592.49025266 TDT (2024 Oct 09.4903) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr25,0.53,2024,10,9,11.766071,0.104268,-0.356057,16.055465,4.675885,0.005394,-0.000634,-0.000001,0.000000 69.5404,-35.0191,0.29,-6.56,False UCAC4 275-112104,17.61395861,-35.0021677,10.43,10.23,10.12,0.0,0,,17.64127809,-35.0191457,8.51,8.17,0,0,0 48462,1991 RT6,18.74,15.689,3.1694,0,0,3.627,12.98,,1.4,0 0,37.0358,2024,10,9,277.8257,320.7959,20.2249,0.08501,3.17271,2.90300,12.93,5.0,0.15 1.418,0.0203,0.0017,80,0.0029,Known errors,0.90,0,-1,-1 20241009_112104,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org