IOTA/IOTA-ES occultation update for (887) Alinda / TYC 4745-00660-1 event on 2024 Dec 30, 01:13 UT Visible from Summary ------- On 2024 Dec 30 UT, the 5.67410267332444 km diameter asteroid (887) Alinda will occult a 9.2 mag star in the constellation Eridanus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.83 mag to 10.84 mag (the magnitude of the asteroid) for at most 0.850 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: 72 * date and approx. time of event: 2024 Dec 30, 00:57 - 2024 Dec 30, 01:29 * geocentric midpoint of event [JD]: 2460674.55130308 * magnitude of target star: 9.23 * magnitude drop [mag]: 1.83 * estimated maximum duration [s]: 0.850 * Moon: 1 % sunlit, 146° distance * Sun: 144° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 6 * 1 sigma uncertainty interval [path widths]: +/- 0.81 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.102, +/- 0.019) * 1 sigma uncertainty ellipse (major, minor, PA): (0.103", 0.014", 83°) * approx speed of asteroid's shadow [km/s]: 6.6967 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4745-00660-1 by 887 Alinda on 2024 Dec 30 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 -131 0 0 -38 18 22 0 58 11.8 0 94 35 -38 19 55 -38 16 49 -38 22 26 -38 14 17 .... -130 0 0 -38 21 43 0 58 12.0 1 94 34 -38 23 17 -38 20 10 -38 25 48 -38 17 39 -0.08 -129 0 0 -38 24 28 0 58 12.3 2 93 33 -38 26 2 -38 22 55 -38 28 32 -38 20 24 -0.11 -128 0 0 -38 26 37 0 58 12.9 3 93 33 -38 28 10 -38 25 4 -38 30 41 -38 22 33 -0.12 -127 0 0 -38 28 8 0 58 13.6 4 92 32 -38 29 42 -38 26 35 -38 32 12 -38 24 4 -0.13 -126 0 0 -38 29 4 0 58 14.5 4 91 31 -38 30 37 -38 27 30 -38 33 7 -38 25 0 -0.13 -125 0 0 -38 29 22 0 58 15.6 5 91 30 -38 30 55 -38 27 49 -38 33 26 -38 25 18 -0.14 -124 0 0 -38 29 4 0 58 16.9 6 90 29 -38 30 37 -38 27 31 -38 33 8 -38 25 0 -0.14 -123 0 0 -38 28 8 0 58 18.4 7 90 29 -38 29 42 -38 26 35 -38 32 12 -38 24 4 -0.14 -122 0 0 -38 26 36 0 58 20.0 7 89 28 -38 28 10 -38 25 3 -38 30 40 -38 22 32 -0.14 -121 0 0 -38 24 27 0 58 21.8 8 88 27 -38 26 0 -38 22 54 -38 28 31 -38 20 23 -0.15 -120 0 0 -38 21 41 0 58 23.8 9 88 26 -38 23 14 -38 20 7 -38 25 45 -38 17 36 -0.15 -119 0 0 -38 18 17 0 58 26.0 10 87 25 -38 19 50 -38 16 43 -38 22 22 -38 14 12 -0.15 -118 0 0 -38 14 15 0 58 28.4 11 86 25 -38 15 49 -38 12 42 -38 18 20 -38 10 10 -0.15 -117 0 0 -38 9 36 0 58 31.0 11 86 24 -38 11 9 -38 8 2 -38 13 41 -38 5 30 -0.15 -116 0 0 -38 4 18 0 58 33.8 12 85 23 -38 5 52 -38 2 44 -38 8 24 -38 0 12 -0.15 -115 0 0 -37 58 22 0 58 36.7 13 85 22 -37 59 56 -37 56 48 -38 2 28 -37 54 16 -0.15 -114 0 0 -37 51 47 0 58 39.9 14 84 21 -37 53 21 -37 50 13 -37 55 54 -37 47 40 -0.15 -113 0 0 -37 44 33 0 58 43.2 15 83 21 -37 46 7 -37 42 58 -37 48 40 -37 40 25 -0.16 -112 0 0 -37 36 39 0 58 46.8 15 83 20 -37 38 14 -37 35 4 -37 40 47 -37 32 31 -0.16 -111 0 0 -37 28 6 0 58 50.6 16 82 19 -37 29 40 -37 26 31 -37 32 14 -37 23 57 -0.16 -110 0 0 -37 18 52 0 58 54.6 17 82 18 -37 20 27 -37 17 17 -37 23 1 -37 14 42 -0.16 -109 0 0 -37 8 57 0 58 58.7 18 81 17 -37 10 32 -37 7 22 -37 13 7 -37 4 47 -0.16 -108 0 0 -36 58 21 0 59 3.2 19 80 17 -36 59 57 -36 56 45 -37 2 32 -36 54 10 -0.16 -107 0 0 -36 47 3 0 59 7.8 20 80 16 -36 48 39 -36 45 27 -36 51 15 -36 42 52 -0.16 -106 0 0 -36 35 3 0 59 12.6 20 79 15 -36 36 39 -36 33 27 -36 39 15 -36 30 51 -0.16 -105 0 0 -36 22 20 0 59 17.7 21 79 14 -36 23 57 -36 20 43 -36 26 33 -36 18 7 -0.16 -104 0 0 -36 8 53 0 59 23.0 22 78 13 -36 10 30 -36 7 16 -36 13 7 -36 4 39 -0.16 -103 0 0 -35 54 43 0 59 28.6 23 77 12 -35 56 20 -35 53 5 -35 58 58 -35 50 27 -0.16 -102 0 0 -35 39 47 0 59 34.4 24 77 11 -35 41 25 -35 38 9 -35 44 3 -35 35 31 -0.16 -101 0 0 -35 24 6 0 59 40.5 25 76 11 -35 25 44 -35 22 28 -35 28 23 -35 19 48 -0.17 -100 0 0 -35 7 38 0 59 46.8 26 76 10 -35 9 17 -35 6 0 -35 11 57 -35 3 20 -0.17 - 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1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.103", 0.014", 83.021° remarks: * orbital elements for (887)Alinda : Mean anomaly = 358.9715014192 deg Arg. of pericenter = 350.4860801477 deg Long. of node = 110.4135824863 deg Inclination = 9.4008600523 deg Eccentricity = 0.5712559273 Semimajor axis = 2.4734529211 AU Perihelion dist = 1.0604782789 AU Mag: H = 13.83, G = -0.12 Epoch of elements : MJD 60674.05132745 TDT (2024 Dec 30.0513) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#4412023Jul08,0.85,2024,12,30,1.231274,-0.107382,0.101270,2.593044,2.750136,0.000497,0.000590,0.000000,0.000000 -42.4681,-3.7785,162.16,-23.14,False TYC 4745-00660-1,4.97754186,-3.8166939,9.65,9.23,9.00,0.1,0,,4.99865284,-3.7785017,1.84,1.66,0,0,0 887,Alinda,10.84,5.681,0.0951,0,0,16.040,254.67,,0.4,0 0,358.7051,2024,12,29,350.4861,110.4136,9.4009,0.57126,2.47345,1.06048,13.83,5.0,-0.12 1.810,0.1030,0.0140,83,0.0667,Known errors,1.10,0,-1,-1 20241230_0660-1,60140.76 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org