IOTA/IOTA-ES occultation update for (253) Mathilde / UCAC4 540-018376 event on 2024 Apr 25, 18:35 UT Visible from Summary ------- On 2024 Apr 25 UT, the 58.012 km diameter asteroid (253) Mathilde will occult a 12.0 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.27 mag to 16.24 mag (the magnitude of the asteroid) for at most 1.640 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 Apr 25, 18:32 - 2024 Apr 25, 18:38 * geocentric midpoint of event [JD]: 2460426.27457979 * magnitude of target star: 11.99 * magnitude drop [mag]: 4.27 * estimated maximum duration [s]: 1.640 * Moon: 97 % sunlit, 150° distance * Sun: 50° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 65 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 0.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.004, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.004", 0.001", 89°) * approx speed of asteroid's shadow [km/s]: 35.4027 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 540-018376 by 253 Mathilde on 2024 Apr 25 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 -125 0 0 -29 56 35 18 32 43.0 1 69 40 -30 15 24 -29 37 50 -30 16 49 -29 36 25 .... -124 0 0 -29 36 43 18 32 43.1 2 68 41 -29 55 32 -29 17 58 -29 56 58 -29 16 33 0.28 -123 0 0 -29 16 46 18 32 43.2 3 68 41 -29 35 35 -28 58 0 -29 37 0 -28 56 35 0.36 -122 0 0 -28 56 43 18 32 43.4 4 67 42 -29 15 32 -28 37 56 -29 16 57 -28 36 32 0.39 -121 0 0 -28 36 35 18 32 43.6 4 67 43 -28 55 24 -28 17 48 -28 56 49 -28 16 24 0.41 -120 0 0 -28 16 22 18 32 43.9 5 66 43 -28 35 12 -27 57 36 -28 36 37 -27 56 11 0.43 -119 0 0 -27 56 6 18 32 44.2 6 66 44 -28 14 56 -27 37 20 -28 16 21 -27 35 55 0.44 -118 0 0 -27 35 46 18 32 44.6 7 66 45 -27 54 36 -27 17 0 -27 56 1 -27 15 36 0.45 -117 0 0 -27 15 24 18 32 45.1 8 65 46 -27 34 13 -26 56 37 -27 35 38 -26 55 13 0.45 -116 0 0 -26 54 58 18 32 45.6 9 65 46 -27 13 48 -26 36 12 -27 15 13 -26 34 48 0.46 -115 0 0 -26 34 31 18 32 46.2 10 64 47 -26 53 20 -26 15 45 -26 54 45 -26 14 20 0.46 -114 0 0 -26 14 2 18 32 46.8 11 64 48 -26 32 51 -25 55 16 -26 34 16 -25 53 52 0.46 -113 0 0 -25 53 32 18 32 47.5 12 63 48 -26 12 21 -25 34 46 -26 13 46 -25 33 22 0.47 -112 0 0 -25 33 1 18 32 48.2 13 63 49 -25 51 49 -25 14 16 -25 53 15 -25 12 51 0.47 -111 0 0 -25 12 30 18 32 49.0 14 62 50 -25 31 18 -24 53 45 -25 32 43 -24 52 21 0.47 -110 0 0 -24 52 0 18 32 49.8 15 62 50 -25 10 47 -24 33 15 -25 12 12 -24 31 51 0.47 -109 0 0 -24 31 30 18 32 50.8 16 61 51 -24 50 17 -24 12 46 -24 51 42 -24 11 21 0.48 -108 0 0 -24 11 1 18 32 51.7 17 61 51 -24 29 48 -23 52 18 -24 31 13 -23 50 54 0.48 -107 0 0 -23 50 35 18 32 52.8 18 60 52 -24 9 21 -23 31 52 -24 10 46 -23 30 28 0.48 -106 0 0 -23 30 11 18 32 53.8 19 60 52 -23 48 56 -23 11 28 -23 50 21 -23 10 4 0.48 -105 0 0 -23 9 49 18 32 55.0 20 60 53 -23 28 34 -22 51 8 -23 29 59 -22 49 43 0.48 -104 0 0 -22 49 31 18 32 56.2 21 59 53 -23 8 15 -22 30 50 -23 9 40 -22 29 26 0.48 -103 0 0 -22 29 17 18 32 57.4 22 59 54 -22 48 0 -22 10 37 -22 49 25 -22 9 12 0.48 -102 0 0 -22 9 7 18 32 58.8 23 58 54 -22 27 50 -21 50 27 -22 29 14 -21 49 3 0.48 -101 0 0 -21 49 2 18 33 0.1 24 58 55 -22 7 44 -21 30 23 -22 9 8 -21 28 59 0.48 -100 0 0 -21 29 2 18 33 1.6 25 57 55 -21 47 43 -21 10 24 -21 49 8 -21 9 0 0.48 - 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1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.004", 0.001", 89° remarks: * orbital elements for (253)Mathilde : Mean anomaly = 96.0930096851 deg Arg. of pericenter = 157.7067587681 deg Long. of node = 179.5074615546 deg Inclination = 6.7402199385 deg Eccentricity = 0.2642324741 Semimajor axis = 2.6473171606 AU Perihelion dist = 1.9478099976 AU Mag: H = 10.41, G = 0.15 Epoch of elements : MJD 60425.77457946 TDT (2024 Apr 25.7746) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#2322023Feb09,1.64,2024,4,25,18.589915,0.038719,-0.447146,19.904982,1.755647,0.004361,-0.000225,-0.000001,0.000000 -47.2125,17.8253,-99.39,13.53,False UCAC4 540-018376,5.70339023,17.8132990,12.76,11.99,11.57,0.0,0,,5.72668991,17.8252883,4.27,4.24,0,0,0 253,Mathilde,16.24,58.012,3.4275,0,0,3.577,4.50,,0.6,0 0,95.9158,2024,4,25,157.7068,179.5075,6.7402,0.26423,2.64732,1.94781,10.41,5.0,0.15 1.038,0.0037,0.0008,89,0.0009,Known errors,1.23,0,-1,-1 20240425_018376,60139.31 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 07:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org