IOTA/IOTA-ES occultation update for (1257) Mora / UCAC4 503-052647 event on 2024 Oct 03, 02:42 UT Visible from Summary ------- On 2024 Oct 03 UT, the 21.0723745881901 km diameter asteroid (1257) Mora will occult a 9.3 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 8.31 mag to 17.56 mag (the magnitude of the asteroid) for at most 0.550 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: 99 * date and approx. time of event: 2024 Oct 03, 02:39 - 2024 Oct 03, 02:45 * geocentric midpoint of event [JD]: 2460586.61281891 * magnitude of target star: 9.25 * magnitude drop [mag]: 8.31 * estimated maximum duration [s]: 0.550 * Moon: 0 % sunlit, 50° distance * Sun: 46° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.002", 107°) * approx speed of asteroid's shadow [km/s]: 38.5884 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 503-052647 by 1257 Mora on 2024 Oct 3 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 4 0 0 2 53 5 2 39 50.0 1 80 -43 2 46 55 2 59 14 2 43 59 3 2 10 .... 5 0 0 3 3 31 2 39 50.1 2 80 -42 2 57 22 3 9 39 2 54 25 3 12 35 0.20 6 0 0 3 13 32 2 39 50.2 3 80 -41 3 7 23 3 19 40 3 4 28 3 22 36 0.24 7 0 0 3 23 9 2 39 50.4 4 80 -40 3 17 1 3 29 17 3 14 5 3 32 12 0.26 8 0 0 3 32 21 2 39 50.6 5 80 -39 3 26 13 3 38 29 3 23 18 3 41 24 0.27 9 0 0 3 41 9 2 39 50.9 6 80 -38 3 35 1 3 47 16 3 32 6 3 50 11 0.28 10 0 0 3 49 31 2 39 51.3 7 80 -37 3 43 24 3 55 38 3 40 29 3 58 33 0.29 11 0 0 3 57 29 2 39 51.6 8 80 -36 3 51 22 4 3 36 3 48 27 4 6 30 0.29 12 0 0 4 5 2 2 39 52.1 9 80 -35 3 58 55 4 11 8 3 56 0 4 14 3 0.29 13 0 0 4 12 9 2 39 52.6 10 80 -34 4 6 3 4 18 15 4 3 8 4 21 10 0.30 14 0 0 4 18 52 2 39 53.2 11 80 -33 4 12 46 4 24 57 4 9 51 4 27 52 0.30 15 0 0 4 25 9 2 39 53.8 12 80 -32 4 19 3 4 31 14 4 16 8 4 34 8 0.30 16 0 0 4 31 0 2 39 54.4 13 80 -31 4 24 55 4 37 6 4 22 0 4 40 0 0.30 17 0 0 4 36 27 2 39 55.1 14 80 -30 4 30 21 4 42 32 4 27 27 4 45 26 0.30 18 0 0 4 41 28 2 39 55.9 15 81 -29 4 35 23 4 47 32 4 32 28 4 50 26 0.31 19 0 0 4 46 3 2 39 56.7 16 81 -28 4 39 58 4 52 7 4 37 4 4 55 1 0.31 20 0 0 4 50 13 2 39 57.6 17 81 -27 4 44 8 4 56 17 4 41 14 4 59 11 0.31 21 0 0 4 53 57 2 39 58.5 18 81 -26 4 47 52 5 0 1 4 44 58 5 2 55 0.31 22 0 0 4 57 15 2 39 59.4 19 81 -25 4 51 11 5 3 19 4 48 17 5 6 13 0.31 23 0 0 5 0 8 2 40 0.5 20 81 -24 4 54 4 5 6 12 4 51 10 5 9 6 0.31 24 0 0 5 2 35 2 40 1.5 21 81 -23 4 56 31 5 8 39 4 53 37 5 11 33 0.31 25 0 0 5 4 36 2 40 2.6 22 81 -22 4 58 32 5 10 40 4 55 38 5 13 34 0.31 26 0 0 5 6 12 2 40 3.8 23 81 -21 5 0 8 5 12 15 4 57 14 5 15 9 0.31 27 0 0 5 7 21 2 40 5.0 24 81 -20 5 1 17 5 13 25 4 58 24 5 16 19 0.31 28 0 0 5 8 5 2 40 6.2 25 81 -19 5 2 1 5 14 9 4 59 7 5 17 2 0.31 29 0 0 5 8 23 2 40 7.5 26 81 -18 5 2 19 5 14 27 4 59 25 5 17 20 0.31 30 0 0 5 8 15 2 40 8.9 27 81 -17 5 2 11 5 14 19 4 59 17 5 17 12 0.31 31 0 0 5 7 41 2 40 10.3 28 81 -16 5 1 37 5 13 45 4 58 43 5 16 38 0.31 32 0 0 5 6 41 2 40 11.7 29 81 -15 5 0 37 5 12 45 4 57 43 5 15 38 0.31 33 0 0 5 5 15 2 40 13.2 30 81 -14 4 59 11 5 11 19 4 56 17 5 14 13 0.31 34 0 0 5 3 24 2 40 14.8 31 81 -13 4 57 19 5 9 28 4 54 25 5 12 21 0.32 35 0 0 5 1 6 2 40 16.3 32 81 -12 4 55 2 5 7 10 4 52 8 5 10 4 0.32 36 0 0 4 58 22 2 40 18.0 33 81 -11 4 52 18 5 4 26 4 49 24 5 7 20 0.32 37 0 0 4 55 13 2 40 19.6 34 81 -10 4 49 8 5 1 17 4 46 14 5 4 11 0.32 38 0 0 4 51 37 2 40 21.4 35 81 -9 4 45 32 4 57 42 4 42 38 5 0 36 0.32 39 0 0 4 47 36 2 40 23.1 36 81 -8 4 41 31 4 53 41 4 38 37 4 56 34 0.32 40 0 0 4 43 9 2 40 24.9 37 81 -7 4 37 3 4 49 13 4 34 9 4 52 8 0.32 41 0 0 4 38 15 2 40 26.8 38 81 -6 4 32 10 4 44 20 4 29 16 4 47 15 0.32 42 0 0 4 32 56 2 40 28.7 39 80 -5 4 26 51 4 39 2 4 23 56 4 41 56 0.32 43 0 0 4 27 12 2 40 30.6 40 80 -4 4 21 6 4 33 17 4 18 11 4 36 12 0.32 44 0 0 4 21 1 2 40 32.6 41 80 -3 4 14 55 4 27 7 4 12 0 4 30 1 0.32 45 0 0 4 14 25 2 40 34.6 42 80 -2 4 8 18 4 20 31 4 5 23 4 23 25 0.32 46 0 0 4 7 23 2 40 36.6 43 80 -1 4 1 16 4 13 29 3 58 21 4 16 24 0.32 47 0 0 3 59 55 2 40 38.7 44 80 0 3 53 48 4 6 2 3 50 53 4 8 57 0.32 48 0 0 3 52 2 2 40 40.9 45 79 1 3 45 54 3 58 9 3 42 59 4 1 4 0.32 49 0 0 3 43 43 2 40 43.0 45 79 2 3 37 35 3 49 50 3 34 40 3 52 46 0.32 50 0 0 3 34 59 2 40 45.3 46 79 3 3 28 51 3 41 6 3 25 55 3 44 2 0.32 51 0 0 3 25 49 2 40 47.5 47 78 4 3 19 40 3 31 57 3 16 45 3 34 53 0.32 52 0 0 3 16 14 2 40 49.8 48 78 5 3 10 5 3 22 23 3 7 9 3 25 19 0.32 53 0 0 3 6 14 2 40 52.1 49 78 6 3 0 5 3 12 23 2 57 8 3 15 19 0.32 54 0 0 2 55 49 2 40 54.5 50 77 7 2 49 39 3 1 58 2 46 42 3 4 54 0.32 55 0 0 2 44 58 2 40 56.9 51 77 8 2 38 48 2 51 8 2 35 51 2 54 5 0.32 56 0 0 2 33 43 2 40 59.3 52 76 9 2 27 32 2 39 53 2 24 35 2 42 50 0.32 57 0 0 2 22 3 2 41 1.8 53 76 10 2 15 52 2 28 14 2 12 54 2 31 11 0.32 58 0 0 2 9 58 2 41 4.3 54 75 11 2 3 46 2 16 9 2 0 49 2 19 6 0.32 59 0 0 1 57 28 2 41 6.9 55 75 12 1 51 16 2 3 40 1 48 19 2 6 38 0.32 60 0 0 1 44 35 2 41 9.4 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-34 15 41 0.32 161 0 0 -34 40 42 2 45 1.5 11 291 52 -34 47 2 -34 34 22 -34 50 4 -34 31 21 0.32 162 0 0 -34 56 1 2 45 1.9 10 290 51 -35 2 21 -34 49 42 -35 5 22 -34 46 41 0.32 163 0 0 -35 11 0 2 45 2.4 9 290 50 -35 17 19 -35 4 42 -35 20 20 -35 1 41 0.32 164 0 0 -35 25 40 2 45 2.8 9 289 49 -35 31 58 -35 19 22 -35 34 59 -35 16 21 0.32 165 0 0 -35 39 59 2 45 3.1 8 289 49 -35 46 17 -35 33 42 -35 49 18 -35 30 42 0.32 166 0 0 -35 53 59 2 45 3.5 7 288 48 -36 0 16 -35 47 42 -36 3 16 -35 44 42 0.32 167 0 0 -36 7 39 2 45 3.7 6 287 47 -36 13 55 -36 1 22 -36 16 55 -35 58 23 0.32 168 0 0 -36 20 58 2 45 4.0 5 287 46 -36 27 14 -36 14 43 -36 30 14 -36 11 43 0.32 169 0 0 -36 33 58 2 45 4.2 4 286 46 -36 40 13 -36 27 43 -36 43 12 -36 24 44 0.33 170 0 0 -36 46 37 2 45 4.4 4 286 45 -36 52 52 -36 40 23 -36 55 51 -36 37 24 0.33 171 0 0 -36 58 57 2 45 4.5 3 285 44 -37 5 11 -36 52 43 -37 8 10 -36 49 44 0.33 172 0 0 -37 10 56 2 45 4.6 2 284 43 -37 17 10 -37 4 43 -37 20 8 -37 1 44 0.34 173 0 0 -37 22 35 2 45 4.7 1 284 43 -37 28 49 -37 16 22 -37 31 47 -37 13 25 0.36 174 0 0 -37 33 55 2 45 4.7 0 283 42 -37 40 7 -37 27 42 -37 43 5 -37 24 45 0.53 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 503-052647 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 09 42 07.7688 DE: +10 25 36.098 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 09 42 07.7688 DE: +10 25 36.097 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.3 * B mag [mag]: 9.9 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1257) Mora asteroid class: approx. diameter [km]: 21 approx. diameter ["]: 0.009 distance from Earth [AU]: 3.12470 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 date of fit: 2023 Feb 11 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", 0.002", 107.247° remarks: * orbital elements for (1257)Mora : Mean anomaly = 262.4575891829 deg Arg. of pericenter = 20.7498811457 deg Long. of node = 213.8805058246 deg Inclination = 3.9280216323 deg Eccentricity = 0.0831760375 Semimajor axis = 2.4876278195 AU Perihelion dist = 2.2807167946 AU Mag: H = 12.19, G = 0.15 Epoch of elements : MJD 60586.11281883 TDT (2024 Oct 03.1128) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Feb11,0.55,2024,10,3,2.707654,-0.105448,-0.285000,20.408899,-7.606739,-0.003912,0.001134,-0.000001,0.000000 92.9431,10.3161,136.63,-4.11,False UCAC4 503-052647,9.70215793,10.4266940,9.91,9.25,8.89,0.1,0,,9.72398683,10.3161016,8.32,8.22,0,0,0 1257,Mora,17.56,21.299,3.1247,0,0,3.892,-21.41,,1.6,0 0,262.4292,2024,10,3,20.7499,213.8805,3.9280,0.08318,2.48763,2.28072,12.19,5.0,0.15 1.239,0.0100,0.0022,107,0.0023,Known errors,1.02,0,-1,-1 20241003_052647,60140.61 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org