IOTA/IOTA-ES occultation update for (51921) 2001 QU90 / UCAC4 467-041596 event on 2024 Oct 14, 23:21 UT Visible from Summary ------- On 2024 Oct 14 UT, the 12.37 km diameter asteroid (51921) 2001 QU90 will occult a 11.0 mag star in the constellation Hydra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.46 mag to 18.41 mag (the magnitude of the asteroid) for at most 0.390 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 14, 23:18 - 2024 Oct 14, 23:24 * geocentric midpoint of event [JD]: 2460598.47334404 * magnitude of target star: 10.95 * magnitude drop [mag]: 7.46 * estimated maximum duration [s]: 0.390 * Moon: 91 % sunlit, 150° distance * Sun: 63° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.012) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.003", 131°) * approx speed of asteroid's shadow [km/s]: 32.0615 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 467-041596 by 51921 2001 QU90 on 2024 Oct 14 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 30 0 0 53 53 22 23 18 23.1 0 85 -41 .. .. .. 53 56 47 .. .. .. 53 59 33 .... 31 0 0 53 56 27 23 18 23.1 1 85 -41 53 53 1 53 59 53 53 50 16 54 2 38 -0.15 32 0 0 53 59 7 23 18 23.1 1 86 -40 53 55 42 54 2 33 53 52 57 54 5 17 -0.18 33 0 0 54 1 22 23 18 23.2 2 87 -40 53 57 56 54 4 47 53 55 12 54 7 32 -0.19 34 0 0 54 3 11 23 18 23.3 2 88 -40 53 59 46 54 6 36 53 57 2 54 9 21 -0.20 35 0 0 54 4 35 23 18 23.4 3 89 -39 54 1 10 54 8 0 53 58 26 54 10 45 -0.20 36 0 0 54 5 34 23 18 23.5 4 90 -39 54 2 9 54 8 59 53 59 25 54 11 44 -0.20 37 0 0 54 6 8 23 18 23.6 4 90 -39 54 2 43 54 9 33 53 59 59 54 12 18 -0.21 38 0 0 54 6 17 23 18 23.8 5 91 -38 54 2 52 54 9 42 54 0 8 54 12 27 -0.21 39 0 0 54 6 1 23 18 24.0 5 92 -38 54 2 36 54 9 26 53 59 52 54 12 10 -0.21 40 0 0 54 5 19 23 18 24.2 6 93 -37 54 1 54 54 8 44 53 59 10 54 11 29 -0.21 41 0 0 54 4 13 23 18 24.4 6 94 -37 54 0 48 54 7 38 53 58 3 54 10 22 -0.21 42 0 0 54 2 41 23 18 24.7 7 94 -37 53 59 16 54 6 6 53 56 31 54 8 51 -0.21 43 0 0 54 0 44 23 18 24.9 8 95 -36 53 57 18 54 4 9 53 54 34 54 6 54 -0.21 44 0 0 53 58 21 23 18 25.2 8 96 -36 53 54 56 54 1 47 53 52 11 54 4 32 -0.21 45 0 0 53 55 33 23 18 25.5 9 97 -35 53 52 8 53 58 59 53 49 23 54 1 44 -0.21 46 0 0 53 52 20 23 18 25.9 9 98 -35 53 48 54 53 55 46 53 46 9 53 58 31 -0.21 47 0 0 53 48 40 23 18 26.2 10 98 -35 53 45 14 53 52 7 53 42 29 53 54 52 -0.21 48 0 0 53 44 35 23 18 26.6 11 99 -34 53 41 9 53 48 2 53 38 23 53 50 47 -0.21 49 0 0 53 40 4 23 18 27.0 11 100 -34 53 36 38 53 43 31 53 33 52 53 46 17 -0.21 50 0 0 53 35 7 23 18 27.4 12 101 -33 53 31 40 53 38 34 53 28 54 53 41 20 -0.21 51 0 0 53 29 43 23 18 27.9 12 102 -33 53 26 16 53 33 11 53 23 30 53 35 57 -0.21 52 0 0 53 23 53 23 18 28.4 13 102 -32 53 20 25 53 27 21 53 17 39 53 30 8 -0.21 53 0 0 53 17 36 23 18 28.9 14 103 -32 53 14 8 53 21 4 53 11 21 53 23 51 -0.21 54 0 0 53 10 52 23 18 29.4 14 104 -32 53 7 23 53 14 21 53 4 36 53 17 8 -0.21 55 0 0 53 3 40 23 18 29.9 15 105 -31 53 0 11 53 7 10 52 57 24 53 9 57 -0.21 56 0 0 52 56 1 23 18 30.5 15 106 -31 52 52 32 52 59 31 52 49 44 53 2 19 -0.21 57 0 0 52 47 55 23 18 31.1 16 106 -30 52 44 24 52 51 25 52 41 36 52 54 14 -0.21 58 0 0 52 39 20 23 18 31.7 17 107 -30 52 35 49 52 42 50 52 33 0 52 45 39 -0.21 59 0 0 52 30 16 23 18 32.4 17 108 -29 52 26 45 52 33 47 52 23 55 52 36 37 -0.21 60 0 0 52 20 44 23 18 33.1 18 109 -29 52 17 12 52 24 16 52 14 22 52 27 6 -0.21 61 0 0 52 10 42 23 18 33.8 19 110 -28 52 7 9 52 14 15 52 4 19 52 17 5 -0.21 62 0 0 52 0 11 23 18 34.5 19 111 -28 51 56 37 52 3 44 51 53 46 52 6 35 -0.21 63 0 0 51 49 10 23 18 35.3 20 111 -27 51 45 35 51 52 44 51 42 44 51 55 35 -0.21 64 0 0 51 37 38 23 18 36.1 21 112 -27 51 34 3 51 41 13 51 31 11 51 44 5 -0.21 65 0 0 51 25 36 23 18 36.9 21 113 -26 51 22 0 51 29 11 51 19 7 51 32 4 -0.21 66 0 0 51 13 2 23 18 37.8 22 114 -26 51 9 25 51 16 38 51 6 32 51 19 32 -0.21 67 0 0 50 59 57 23 18 38.7 23 115 -25 50 56 19 51 3 34 50 53 25 51 6 28 -0.21 68 0 0 50 46 19 23 18 39.6 23 115 -25 50 42 41 50 49 57 50 39 46 50 52 52 -0.21 69 0 0 50 32 9 23 18 40.6 24 116 -24 50 28 30 50 35 48 50 25 34 50 38 44 -0.21 70 0 0 50 17 25 23 18 41.6 25 117 -24 50 13 45 50 21 5 50 10 49 50 24 2 -0.21 71 0 0 50 2 8 23 18 42.6 25 118 -23 49 58 27 50 5 49 49 55 30 50 8 46 -0.21 72 0 0 49 46 17 23 18 43.7 26 119 -22 49 42 35 49 49 59 49 39 37 49 52 57 -0.21 73 0 0 49 29 51 23 18 44.8 27 119 -22 49 26 8 49 33 34 49 23 9 49 36 32 -0.21 74 0 0 49 12 49 23 18 46.0 27 120 -21 49 9 5 49 16 33 49 6 6 49 19 33 -0.21 75 0 0 48 55 12 23 18 47.2 28 121 -21 48 51 27 48 58 57 48 48 26 49 1 57 -0.21 76 0 0 48 36 58 23 18 48.4 29 122 -20 48 33 12 48 40 44 48 30 10 48 43 45 -0.21 77 0 0 48 18 7 23 18 49.7 30 123 -20 48 14 19 48 21 54 48 11 17 48 24 56 -0.21 78 0 0 47 58 38 23 18 51.0 30 123 -19 47 54 50 48 2 26 47 51 46 48 5 30 -0.21 79 0 0 47 38 31 23 18 52.4 31 124 -18 47 34 41 47 42 20 47 31 37 47 45 25 -0.21 80 0 0 47 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-0.23 -167 0 0 -26 28 23 23 24 43.2 16 282 71 -26 31 57 -26 24 50 -26 34 48 -26 21 58 -0.23 -166 0 0 -26 43 7 23 24 44.1 15 281 70 -26 46 40 -26 39 34 -26 49 31 -26 36 43 -0.23 -165 0 0 -26 57 9 23 24 44.9 14 281 70 -27 0 42 -26 53 37 -27 3 32 -26 50 47 -0.23 -164 0 0 -27 10 30 23 24 45.7 13 281 69 -27 14 2 -27 6 58 -27 16 52 -27 4 9 -0.24 -163 0 0 -27 23 10 23 24 46.4 12 280 68 -27 26 41 -27 19 39 -27 29 30 -27 16 50 -0.24 -162 0 0 -27 35 10 23 24 47.1 11 280 68 -27 38 40 -27 31 39 -27 41 29 -27 28 50 -0.24 -161 0 0 -27 46 29 23 24 47.7 11 279 67 -27 49 59 -27 42 59 -27 52 47 -27 40 10 -0.24 -160 0 0 -27 57 8 23 24 48.3 10 279 66 -28 0 37 -27 53 38 -28 3 25 -27 50 50 -0.24 -159 0 0 -28 7 7 23 24 48.8 9 278 66 -28 10 36 -28 3 38 -28 13 24 -28 0 51 -0.24 -158 0 0 -28 16 27 23 24 49.2 8 278 65 -28 19 56 -28 12 59 -28 22 43 -28 10 12 -0.24 -157 0 0 -28 25 8 23 24 49.6 7 277 64 -28 28 36 -28 21 40 -28 31 23 -28 18 53 -0.24 -156 0 0 -28 33 10 23 24 50.0 6 277 63 -28 36 38 -28 29 42 -28 39 25 -28 26 56 -0.24 -155 0 0 -28 40 33 23 24 50.3 5 276 63 -28 44 1 -28 37 6 -28 46 47 -28 34 19 -0.25 -154 0 0 -28 47 18 23 24 50.6 4 276 62 -28 50 45 -28 43 51 -28 53 31 -28 41 5 -0.25 -153 0 0 -28 53 24 23 24 50.8 3 275 61 -28 56 51 -28 49 57 -28 59 37 -28 47 12 -0.26 -152 0 0 -28 58 52 23 24 50.9 3 275 60 -29 2 19 -28 55 26 -29 5 5 -28 52 40 -0.27 -151 0 0 -29 3 43 23 24 51.1 2 275 60 -29 7 9 -29 0 16 -29 9 54 -28 57 31 -0.29 -150 0 0 -29 7 55 23 24 51.1 1 274 59 -29 11 21 -29 4 29 -29 14 6 -29 1 43 -0.37 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 467-041596 * constellation : Hydra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 09 10 13.4170 DE: +03 14 56.913 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 09 10 13.4172 DE: +03 14 56.912 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.0 * B mag [mag]: 11.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (51921) 2001 QU90 asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.63460 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#35 date of fit: 2023 Apr 27 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): 0.019", 0.003", 130.675° remarks: * orbital elements for (51921)2001 QU90 : Mean anomaly = 47.8504926150 deg Arg. of pericenter = 140.1916088720 deg Long. of node = 269.2372620917 deg Inclination = 28.6375574435 deg Eccentricity = 0.2185544750 Semimajor axis = 2.6684474707 AU Perihelion dist = 2.0852463347 AU Mag: H = 13.37, G = 0.15 Epoch of elements : MJD 60597.97334401 TDT (2024 Oct 14.9733) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#352023Apr27,0.39,2024,10,14,23.360257,0.141423,0.160631,13.566196,-11.976602,-0.004899,0.000981,-0.000001,0.000000 123.4800,3.1509,-173.96,-8.61,False UCAC4 467-041596,9.17039356,3.2491427,11.31,10.95,10.76,0.0,0,,9.19173503,3.1508719,7.46,7.21,0,0,0 51921,2001 QU90,18.41,12.370,2.6346,0,0,3.023,-39.98,,0.8,0 0,47.6304,2024,10,14,140.1916,269.2373,28.6376,0.21855,2.66845,2.08525,13.37,5.0,0.15 1.401,0.0187,0.0026,131,0.0026,Known errors,0.86,0,-1,-1 20241014_041596,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org