IOTA/IOTA-ES occultation update for (951) Gaspra / UCAC4 346-125740 event on 2024 Oct 15, 23:21 UT Visible from Summary ------- On 2024 Oct 15 UT, the 12.1321296476326 km diameter asteroid (951) Gaspra will occult a 11.4 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 4.73 mag to 16.08 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: 94 * date and approx. time of event: 2024 Oct 15, 23:17 - 2024 Oct 15, 23:24 * geocentric midpoint of event [JD]: 2460599.47308641 * magnitude of target star: 11.36 * magnitude drop [mag]: 4.73 * estimated maximum duration [s]: 0.430 * Moon: 97 % sunlit, 91° distance * Sun: 68° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.003", 83°) * approx speed of asteroid's shadow [km/s]: 28.8140 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 346-125740 by 951 Gaspra on 2024 Oct 15 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 158 0 0 -21 52 13 23 17 50.3 0 112 59 -21 56 12 -21 48 15 -21 59 47 -21 44 40 .... 159 0 0 -22 15 28 23 17 50.4 1 112 60 -22 19 26 -22 11 30 -22 23 2 -22 7 54 0.38 160 0 0 -22 38 42 23 17 50.6 2 112 61 -22 42 40 -22 34 44 -22 46 16 -22 31 8 0.39 161 0 0 -23 1 54 23 17 50.8 3 111 61 -23 5 53 -22 57 56 -23 9 29 -22 54 20 0.40 162 0 0 -23 25 5 23 17 51.1 4 111 62 -23 29 3 -23 21 6 -23 32 39 -23 17 31 0.41 163 0 0 -23 48 13 23 17 51.4 5 110 63 -23 52 11 -23 44 14 -23 55 47 -23 40 39 0.41 164 0 0 -24 11 18 23 17 51.9 6 110 63 -24 15 16 -24 7 19 -24 18 52 -24 3 44 0.41 165 0 0 -24 34 19 23 17 52.4 7 110 64 -24 38 18 -24 30 21 -24 41 54 -24 26 45 0.41 166 0 0 -24 57 16 23 17 53.0 8 109 64 -25 1 15 -24 53 18 -25 4 51 -24 49 42 0.41 167 0 0 -25 20 9 23 17 53.6 9 109 65 -25 24 7 -25 16 10 -25 27 43 -25 12 34 0.41 168 0 0 -25 42 56 23 17 54.3 10 108 65 -25 46 54 -25 38 57 -25 50 30 -25 35 22 0.41 169 0 0 -26 5 37 23 17 55.1 11 108 66 -26 9 35 -26 1 39 -26 13 11 -25 58 3 0.41 170 0 0 -26 28 12 23 17 55.9 12 107 66 -26 32 10 -26 24 14 -26 35 46 -26 20 38 0.42 171 0 0 -26 50 40 23 17 56.8 13 107 67 -26 54 38 -26 46 42 -26 58 14 -26 43 6 0.42 172 0 0 -27 13 1 23 17 57.8 14 106 67 -27 16 59 -27 9 3 -27 20 34 -27 5 27 0.42 173 0 0 -27 35 13 23 17 58.8 15 106 67 -27 39 11 -27 31 16 -27 42 47 -27 27 40 0.42 174 0 0 -27 57 18 23 17 59.9 16 105 67 -28 1 16 -27 53 20 -28 4 51 -27 49 45 0.42 175 0 0 -28 19 14 23 18 1.1 17 105 68 -28 23 11 -28 15 16 -28 26 47 -28 11 41 0.42 176 0 0 -28 41 0 23 18 2.3 18 104 68 -28 44 58 -28 37 3 -28 48 33 -28 33 28 0.42 177 0 0 -29 2 37 23 18 3.6 19 104 68 -29 6 34 -28 58 39 -29 10 9 -28 55 5 0.42 178 0 0 -29 24 3 23 18 4.9 20 103 68 -29 28 0 -29 20 6 -29 31 35 -29 16 31 0.42 179 0 0 -29 45 19 23 18 6.3 21 103 68 -29 49 16 -29 41 22 -29 52 51 -29 37 48 0.42 -180 0 0 -30 6 24 23 18 7.7 22 102 68 -30 10 21 -30 2 27 -30 13 55 -29 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-45 -26 30 11 -26 22 14 -26 33 47 -26 18 39 0.44 - 22 0 0 -26 3 36 23 24 31.5 15 254 -46 -26 7 34 -25 59 37 -26 11 10 -25 56 2 0.44 - 21 0 0 -25 40 52 23 24 32.5 14 253 -47 -25 44 51 -25 36 54 -25 48 27 -25 33 18 0.45 - 20 0 0 -25 18 4 23 24 33.4 13 253 -48 -25 22 2 -25 14 5 -25 25 38 -25 10 29 0.45 - 19 0 0 -24 55 9 23 24 34.3 12 252 -49 -24 59 8 -24 51 11 -25 2 44 -24 47 35 0.45 - 18 0 0 -24 32 11 23 24 35.1 11 252 -50 -24 36 9 -24 28 12 -24 39 45 -24 24 36 0.45 - 17 0 0 -24 9 8 23 24 35.8 10 251 -50 -24 13 6 -24 5 9 -24 16 42 -24 1 33 0.46 - 16 0 0 -23 46 1 23 24 36.5 9 251 -51 -23 49 59 -23 42 3 -23 53 36 -23 38 27 0.46 - 15 0 0 -23 22 51 23 24 37.1 8 251 -52 -23 26 50 -23 18 53 -23 30 26 -23 15 17 0.47 - 14 0 0 -22 59 39 23 24 37.6 7 250 -53 -23 3 38 -22 55 41 -23 7 14 -22 52 5 0.47 - 13 0 0 -22 36 25 23 24 38.0 6 250 -54 -22 40 24 -22 32 27 -22 44 0 -22 28 51 0.48 - 12 0 0 -22 13 10 23 24 38.4 5 249 -55 -22 17 8 -22 9 12 -22 20 44 -22 5 36 0.50 - 11 0 0 -21 49 54 23 24 38.7 4 249 -55 -21 53 52 -21 45 56 -21 57 28 -21 42 20 0.52 - 10 0 0 -21 26 37 23 24 39.0 3 249 -56 -21 30 36 -21 22 39 -21 34 11 -21 19 4 0.56 - 9 0 0 -21 3 22 23 24 39.1 2 248 -57 -21 7 20 -20 59 24 -21 10 55 -20 55 48 0.65 - 8 0 0 -20 40 7 23 24 39.2 1 248 -58 -20 44 5 -20 36 9 -20 47 40 -20 32 34 1.03 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 346-125740 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 01 01.6783 DE: -20 50 42.248 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 01 01.6782 DE: -20 50 42.248 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.4 * B mag [mag]: 12.7 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (951) Gaspra asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.29480 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#142 date of fit: 2023 Apr 24 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): 0.010", 0.003", 83.371° remarks: * orbital elements for (951)Gaspra : Mean anomaly = 292.6935155907 deg Arg. of pericenter = 129.9545372391 deg Long. of node = 252.9889809317 deg Inclination = 4.1061112877 deg Eccentricity = 0.1732497229 Semimajor axis = 2.2098791513 AU Perihelion dist = 1.8270182008 AU Mag: H = 11.48, G = 0.15 Epoch of elements : MJD 60598.97308638 TDT (2024 Oct 15.9731) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1422023Apr24,0.43,2024,10,15,23.354074,0.003991,-0.382202,16.262305,0.190572,0.004982,0.000116,-0.000001,0.000000 -104.6647,-20.8464,-173.92,-8.98,False UCAC4 346-125740,18.01713289,-20.8450689,12.71,11.36,10.63,0.2,0,,18.04159426,-20.8464429,4.74,5.01,0,0,0 951,Gaspra,16.08,12.465,2.2948,0,0,4.446,0.73,,0.0,0 0,292.4016,2024,10,15,129.9545,252.9890,4.1061,0.17325,2.20988,1.82702,11.47,5.0,0.15 1.453,0.0100,0.0032,83,0.0034,Known errors,0.88,0,-1,-1 20241015_125740,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org