IOTA/IOTA-ES occultation update for (173) Ino / UCAC4 476-049637 event on 2024 Nov 21, 18:10 UT Visible from Summary ------- On 2024 Nov 21 UT, the 140.69 km diameter asteroid (173) Ino will occult a 10.8 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.21 mag to 13.94 mag (the magnitude of the asteroid) for at most 5.880 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: 100 * date and approx. time of event: 2024 Nov 21, 18:06 - 2024 Nov 21, 18:14 * geocentric midpoint of event [JD]: 2460636.25717750 * magnitude of target star: 10.79 * magnitude drop [mag]: 3.21 * estimated maximum duration [s]: 5.880 * Moon: 62 % sunlit, 34° distance * Sun: 70° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 150 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.003", 102°) * approx speed of asteroid's shadow [km/s]: 23.9403 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 476-049637 by 173 Ino on 2024 Nov 21 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 109 0 0 - 7 46 1 18 6 11.4 0 85 -53 - 8 27 4 - 7 5 9 - 8 30 58 - 7 1 17 .... 110 0 0 - 7 41 3 18 6 11.5 1 85 -53 - 8 22 5 - 7 0 11 - 8 25 59 - 6 56 19 0.19 111 0 0 - 7 36 19 18 6 11.6 2 85 -52 - 8 17 21 - 6 55 29 - 8 21 15 - 6 51 37 0.28 112 0 0 - 7 31 52 18 6 11.9 3 85 -52 - 8 12 53 - 6 51 2 - 8 16 47 - 6 47 10 0.31 113 0 0 - 7 27 40 18 6 12.2 4 85 -51 - 8 8 40 - 6 46 50 - 8 12 34 - 6 42 59 0.33 114 0 0 - 7 23 43 18 6 12.6 5 84 -50 - 8 4 42 - 6 42 54 - 8 8 36 - 6 39 3 0.34 115 0 0 - 7 20 2 18 6 13.1 6 84 -50 - 8 1 1 - 6 39 14 - 8 4 55 - 6 35 22 0.34 116 0 0 - 7 16 37 18 6 13.7 7 84 -49 - 7 57 35 - 6 35 49 - 8 1 29 - 6 31 58 0.35 117 0 0 - 7 13 27 18 6 14.3 8 84 -48 - 7 54 25 - 6 32 40 - 7 58 19 - 6 28 49 0.35 118 0 0 - 7 10 34 18 6 15.1 9 84 -48 - 7 51 31 - 6 29 47 - 7 55 25 - 6 25 56 0.36 119 0 0 - 7 7 56 18 6 15.9 10 84 -47 - 7 48 53 - 6 27 10 - 7 52 47 - 6 23 19 0.36 120 0 0 - 7 5 34 18 6 16.8 11 84 -46 - 7 46 31 - 6 24 49 - 7 50 25 - 6 20 57 0.36 121 0 0 - 7 3 29 18 6 17.8 12 83 -45 - 7 44 25 - 6 22 43 - 7 48 19 - 6 18 52 0.36 122 0 0 - 7 1 39 18 6 18.9 13 83 -45 - 7 42 36 - 6 20 54 - 7 46 29 - 6 17 3 0.36 123 0 0 - 7 0 6 18 6 20.1 14 83 -44 - 7 41 2 - 6 19 21 - 7 44 55 - 6 15 30 0.37 124 0 0 - 6 58 49 18 6 21.3 15 83 -43 - 7 39 45 - 6 18 4 - 7 43 38 - 6 14 13 0.37 125 0 0 - 6 57 48 18 6 22.7 16 83 -42 - 7 38 44 - 6 17 3 - 7 42 37 - 6 13 12 0.37 126 0 0 - 6 57 3 18 6 24.1 17 83 -41 - 7 37 59 - 6 16 19 - 7 41 52 - 6 12 28 0.37 127 0 0 - 6 56 35 18 6 25.6 18 83 -41 - 7 37 31 - 6 15 51 - 7 41 24 - 6 11 59 0.37 128 0 0 - 6 56 23 18 6 27.2 19 82 -40 - 7 37 19 - 6 15 39 - 7 41 12 - 6 11 47 0.37 129 0 0 - 6 56 28 18 6 28.8 20 82 -39 - 7 37 23 - 6 15 43 - 7 41 17 - 6 11 52 0.37 130 0 0 - 6 56 48 18 6 30.6 21 82 -38 - 7 37 44 - 6 16 4 - 7 41 38 - 6 12 12 0.37 131 0 0 - 6 57 26 18 6 32.4 22 82 -37 - 7 38 22 - 6 16 41 - 7 42 15 - 6 12 49 0.37 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33 18 13 36.1 35 299 69 -28 16 33 -26 52 45 -28 20 33 -26 48 47 0.38 -117 0 0 -27 47 22 18 13 38.7 34 298 70 -28 29 21 -27 5 35 -28 33 20 -27 1 38 0.38 -116 0 0 -28 0 2 18 13 41.2 34 298 71 -28 42 0 -27 18 16 -28 45 59 -27 14 19 0.38 -115 0 0 -28 12 33 18 13 43.7 33 297 72 -28 54 29 -27 30 49 -28 58 28 -27 26 52 0.38 -114 0 0 -28 24 55 18 13 46.1 32 296 72 -29 6 50 -27 43 12 -29 10 49 -27 39 15 0.38 -113 0 0 -28 37 7 18 13 48.5 31 296 73 -29 19 1 -27 55 26 -29 22 59 -27 51 29 0.38 -112 0 0 -28 49 10 18 13 50.8 30 295 74 -29 31 2 -28 7 30 -29 35 1 -28 3 33 0.38 -111 0 0 -29 1 3 18 13 53.0 29 295 74 -29 42 53 -28 19 24 -29 46 52 -28 15 28 0.38 -110 0 0 -29 12 46 18 13 55.2 28 294 75 -29 54 35 -28 31 9 -29 58 34 -28 27 13 0.38 -109 0 0 -29 24 19 18 13 57.2 27 294 76 -30 6 7 -28 42 44 -30 10 5 -28 38 48 0.38 -108 0 0 -29 35 42 18 13 59.3 26 293 76 -30 17 28 -28 54 8 -30 21 26 -28 50 12 0.38 -107 0 0 -29 46 54 18 14 1.2 26 292 77 -30 28 39 -29 5 22 -30 32 37 -29 1 26 0.38 -106 0 0 -29 57 56 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20.5 14 285 78 -32 37 12 -31 14 35 -32 41 8 -31 10 42 0.38 - 93 0 0 -32 4 22 18 14 21.6 13 285 77 -32 45 44 -31 23 10 -32 49 40 -31 19 17 0.38 - 92 0 0 -32 12 43 18 14 22.5 13 284 77 -32 54 4 -31 31 33 -32 58 0 -31 27 40 0.39 - 91 0 0 -32 20 52 18 14 23.4 12 283 77 -33 2 12 -31 39 44 -33 6 8 -31 35 51 0.39 - 90 0 0 -32 28 49 18 14 24.2 11 283 76 -33 10 7 -31 47 42 -33 14 3 -31 43 49 0.39 - 89 0 0 -32 36 34 18 14 25.0 10 282 76 -33 17 51 -31 55 28 -33 21 46 -31 51 35 0.39 - 88 0 0 -32 44 6 18 14 25.7 9 282 75 -33 25 22 -32 3 2 -33 29 17 -31 59 9 0.39 - 87 0 0 -32 51 26 18 14 26.3 8 281 74 -33 32 40 -32 10 23 -33 36 35 -32 6 30 0.39 - 86 0 0 -32 58 33 18 14 26.9 7 281 74 -33 39 46 -32 17 32 -33 43 41 -32 13 39 0.39 - 85 0 0 -33 5 28 18 14 27.4 7 280 73 -33 46 39 -32 24 28 -33 50 34 -32 20 35 0.39 - 84 0 0 -33 12 10 18 14 27.9 6 280 72 -33 53 20 -32 31 11 -33 57 15 -32 27 18 0.40 - 83 0 0 -33 18 39 18 14 28.3 5 279 72 -33 59 48 -32 37 42 -34 3 43 -32 33 49 0.40 - 82 0 0 -33 24 56 18 14 28.6 4 278 71 -34 6 3 -32 43 59 -34 9 58 -32 40 7 0.41 - 81 0 0 -33 31 0 18 14 28.8 3 278 70 -34 12 6 -32 50 4 -34 16 1 -32 46 12 0.41 - 80 0 0 -33 36 51 18 14 29.0 2 277 70 -34 17 56 -32 55 57 -34 21 50 -32 52 4 0.43 - 79 0 0 -33 42 29 18 14 29.2 1 277 69 -34 23 33 -33 1 36 -34 27 27 -32 57 44 0.46 - 78 0 0 -33 47 54 18 14 29.3 1 276 68 -34 28 57 -33 7 2 -34 32 51 -33 3 10 0.56 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 476-049637 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 11 22 18.6618 DE: +05 00 43.233 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 11 22 18.6621 DE: +05 00 43.231 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.8 * B mag [mag]: 11.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (173) Ino asteroid class: approx. diameter [km]: 141 approx. diameter ["]: 0.059 distance from Earth [AU]: 3.26970 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#116 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): 0.007", 0.003", 101.662° remarks: * orbital elements for (173)Ino : Mean anomaly = 116.2500776541 deg Arg. of pericenter = 228.5738399483 deg Long. of node = 148.1281482680 deg Inclination = 14.1965733179 deg Eccentricity = 0.2098151930 Semimajor axis = 2.7410925675 AU Perihelion dist = 2.1659697015 AU Mag: H = 8.00, G = 0.01 Epoch of elements : MJD 60635.75717758 TDT (2024 Nov 21.7572) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1162023Apr27,5.88,2024,11,21,18.172260,-0.081217,-0.345415,13.165074,-3.044674,-0.005139,0.002226,-0.000001,0.000000 -162.9212,4.8765,-96.07,-20.13,False UCAC4 476-049637,11.37185047,5.0120093,11.13,10.79,10.61,0.0,0,,11.39310163,4.8765183,3.20,2.95,0,0,0 173,Ino,13.94,140.690,3.2697,0,0,2.370,-8.19,,9.0,0 0,116.0856,2024,11,21,228.5738,148.1281,14.1966,0.20982,2.74109,2.16597,8.00,5.0,0.15 1.047,0.0067,0.0028,102,0.0028,Known errors,1.11,0,-1,-1 20241121_049637,60140.71 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org