IOTA/IOTA-ES occultation update for (951) Gaspra / UCAC4 342-075423 event on 2024 Jan 07, 01:23 UT Visible from Summary ------- On 2024 Jan 07 UT, the 12.0887000862124 km diameter asteroid (951) Gaspra will occult a 11.5 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.38 mag to 16.87 mag (the magnitude of the asteroid) for at most 0.330 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: 97 * date and approx. time of event: 2024 Jan 07, 01:21 - 2024 Jan 07, 01:26 * geocentric midpoint of event [JD]: 2460316.55822204 * magnitude of target star: 11.50 * magnitude drop [mag]: 5.38 * estimated maximum duration [s]: 0.330 * Moon: 22 % sunlit, 9° distance * Sun: 47° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 0.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.002", 97°) * approx speed of asteroid's shadow [km/s]: 37.4955 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 342-075423 by 951 Gaspra on 2024 Jan 7 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 21 0 0 - 1 25 7 1 21 4.4 1 112 -44 - 1 28 49 - 1 21 25 - 1 31 43 - 1 18 32 .... 22 0 0 - 1 49 31 1 21 4.5 2 112 -43 - 1 53 13 - 1 45 49 - 1 56 7 - 1 42 55 0.24 23 0 0 - 2 14 11 1 21 4.6 3 112 -42 - 2 17 53 - 2 10 28 - 2 20 48 - 2 7 34 0.24 24 0 0 - 2 39 6 1 21 4.8 4 112 -41 - 2 42 49 - 2 35 23 - 2 45 43 - 2 32 28 0.24 25 0 0 - 3 4 16 1 21 5.1 5 112 -40 - 3 7 59 - 3 0 32 - 3 10 54 - 2 57 38 0.23 26 0 0 - 3 29 40 1 21 5.4 6 111 -39 - 3 33 23 - 3 25 56 - 3 36 18 - 3 23 1 0.23 27 0 0 - 3 55 17 1 21 5.8 7 111 -38 - 3 59 1 - 3 51 33 - 4 1 56 - 3 48 38 0.23 28 0 0 - 4 21 8 1 21 6.3 8 111 -37 - 4 24 52 - 4 17 24 - 4 27 48 - 4 14 28 0.23 29 0 0 - 4 47 11 1 21 6.8 10 111 -36 - 4 50 55 - 4 43 26 - 4 53 51 - 4 40 30 0.23 30 0 0 - 5 13 26 1 21 7.4 11 111 -35 - 5 17 10 - 5 9 41 - 5 20 6 - 5 6 45 0.23 31 0 0 - 5 39 51 1 21 8.0 12 111 -34 - 5 43 36 - 5 36 6 - 5 46 33 - 5 33 10 0.23 32 0 0 - 6 6 28 1 21 8.7 13 111 -33 - 6 10 13 - 6 2 43 - 6 13 10 - 5 59 46 0.23 33 0 0 - 6 33 14 1 21 9.5 14 111 -32 - 6 37 0 - 6 29 29 - 6 39 57 - 6 26 32 0.23 34 0 0 - 7 0 10 1 21 10.3 15 111 -31 - 7 3 55 - 6 56 24 - 7 6 52 - 6 53 27 0.23 35 0 0 - 7 27 14 1 21 11.2 16 111 -29 - 7 31 0 - 7 23 28 - 7 33 57 - 7 20 31 0.23 36 0 0 - 7 54 25 1 21 12.2 17 110 -28 - 7 58 11 - 7 50 39 - 8 1 9 - 7 47 42 0.23 37 0 0 - 8 21 44 1 21 13.2 18 110 -27 - 8 25 30 - 8 17 58 - 8 28 28 - 8 15 0 0.23 38 0 0 - 8 49 9 1 21 14.2 19 110 -26 - 8 52 56 - 8 45 22 - 8 55 53 - 8 42 25 0.23 39 0 0 - 9 16 40 1 21 15.4 20 110 -25 - 9 20 27 - 9 12 53 - 9 23 24 - 9 9 55 0.23 40 0 0 - 9 44 15 1 21 16.6 21 110 -24 - 9 48 2 - 9 40 28 - 9 51 0 - 9 37 31 0.23 41 0 0 -10 11 55 1 21 17.8 23 109 -23 -10 15 42 -10 8 8 -10 18 40 -10 5 10 0.23 42 0 0 -10 39 38 1 21 19.1 24 109 -22 -10 43 26 -10 35 51 -10 46 24 -10 32 53 0.23 43 0 0 -11 7 24 1 21 20.5 25 109 -21 -11 11 11 -11 3 37 -11 14 10 -11 0 39 0.23 44 0 0 -11 35 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39 -28 49 38 0.25 -167 0 0 -28 36 40 1 26 29.7 15 253 59 -28 40 19 -28 33 1 -28 43 11 -28 30 10 0.25 -166 0 0 -28 16 52 1 26 30.4 14 253 59 -28 20 31 -28 13 12 -28 23 23 -28 10 20 0.25 -165 0 0 -27 56 44 1 26 31.1 14 252 58 -28 0 23 -27 53 4 -28 3 16 -27 50 11 0.25 -164 0 0 -27 36 15 1 26 31.8 13 252 57 -27 39 56 -27 32 35 -27 42 48 -27 29 43 0.25 -163 0 0 -27 15 28 1 26 32.4 12 251 56 -27 19 8 -27 11 47 -27 22 1 -27 8 54 0.25 -162 0 0 -26 54 21 1 26 33.0 11 251 55 -26 58 2 -26 50 40 -27 0 55 -26 47 47 0.25 -161 0 0 -26 32 55 1 26 33.5 10 250 54 -26 36 37 -26 29 14 -26 39 30 -26 26 21 0.26 -160 0 0 -26 11 11 1 26 34.0 9 250 53 -26 14 53 -26 7 29 -26 17 46 -26 4 36 0.26 -159 0 0 -25 49 8 1 26 34.4 8 250 52 -25 52 50 -25 45 26 -25 55 44 -25 42 32 0.26 -158 0 0 -25 26 47 1 26 34.8 7 249 51 -25 30 30 -25 23 5 -25 33 24 -25 20 11 0.27 -157 0 0 -25 4 9 1 26 35.1 6 249 51 -25 7 52 -25 0 26 -25 10 46 -24 57 32 0.28 -156 0 0 -24 41 13 1 26 35.4 5 248 50 -24 44 57 -24 37 30 -24 47 51 -24 34 36 0.28 -155 0 0 -24 18 1 1 26 35.6 4 248 49 -24 21 44 -24 14 18 -24 24 39 -24 11 23 0.30 -154 0 0 -23 54 32 1 26 35.8 3 247 48 -23 58 15 -23 50 48 -24 1 11 -23 47 53 0.32 -153 0 0 -23 30 46 1 26 35.9 2 247 47 -23 34 30 -23 27 3 -23 37 26 -23 24 7 0.37 -152 0 0 -23 6 46 1 26 36.0 1 247 46 -23 10 30 -23 3 1 -23 13 26 -23 0 6 0.55 Uncertainty in time = +/- 0 secs Prediction of 2023 Jul 12.0 Data for the target star ------------------------ * name: UCAC4 342-075423 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 46 45.1086 DE: -21 37 53.789 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 46 45.1086 DE: -21 37 53.789 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.5 * B mag [mag]: 12.2 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (951) Gaspra asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.005 distance from Earth [AU]: 3.13400 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): 0.008", 0.002", 97.357° remarks: * orbital elements for (951)Gaspra : Mean anomaly = 207.8856369720 deg Arg. of pericenter = 129.9031054826 deg Long. of node = 252.9896233733 deg Inclination = 4.1057536173 deg Eccentricity = 0.1732883323 Semimajor axis = 2.2101494351 AU Perihelion dist = 1.8271563255 AU Mag: H = 11.48, G = 0.15 Epoch of elements : MJD 60316.05822204 TDT (2024 Jan 07.0582) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1422023Apr24,0.33,2024,1,7,1.397329,-0.044024,-0.217580,20.727602,-4.273339,-0.004189,0.000809,-0.000001,0.000000 109.9515,-21.7052,160.51,-22.45,False UCAC4 342-075423,15.77919677,-21.6316079,12.21,11.50,11.12,0.1,0,,15.80225834,-21.7052471,5.37,5.31,0,0,0 951,Gaspra,16.87,12.316,3.1340,0,0,4.174,-11.99,,0.0,0 0,207.5682,2024,1,6,129.9031,252.9896,4.1058,0.17329,2.21015,1.82716,11.47,5.0,0.15 1.392,0.0080,0.0020,97,0.0021,Known errors,0.87,0,-1,-1 20240107_075423,60137.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 12, 00:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org