IOTA/IOTA-ES occultation update for (4677) Hiroshi / TYC 1877-00766-1 event on 2024 Dec 05, 03:20 UT Visible from Summary ------- On 2024 Dec 05 UT, the 14.138 km diameter asteroid (4677) Hiroshi will occult a 10.2 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.34 mag to 16.51 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: 97 * date and approx. time of event: 2024 Dec 05, 03:09 - 2024 Dec 05, 03:32 * geocentric midpoint of event [JD]: 2460649.63927696 * magnitude of target star: 10.17 * magnitude drop [mag]: 6.34 * estimated maximum duration [s]: 1.640 * Moon: 15 % sunlit, 153° distance * Sun: 161° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 5.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.040, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.040", 0.005", 91°) * approx speed of asteroid's shadow [km/s]: 8.6191 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1877-00766-1 by 4677 Hiroshi on 2024 Dec 5 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 -115 0 0 -19 9 1 3 31 53.1 1 64 -18 -19 4 21 -19 13 41 -19 0 45 -19 17 18 .... -114 0 0 -18 41 43 3 31 52.8 2 64 -19 -18 37 3 -18 46 23 -18 33 27 -18 49 59 0.21 -113 0 0 -18 14 32 3 31 52.3 3 63 -21 -18 9 53 -18 19 12 -18 6 17 -18 22 48 0.30 -112 0 0 -17 47 29 3 31 51.5 4 63 -22 -17 42 50 -17 52 8 -17 39 15 -17 55 44 0.35 -111 0 0 -17 20 35 3 31 50.4 5 63 -23 -17 15 56 -17 25 13 -17 12 21 -17 28 49 0.37 -110 0 0 -16 53 49 3 31 49.0 6 63 -24 -16 49 11 -16 58 28 -16 45 36 -17 2 3 0.38 -109 0 0 -16 27 14 3 31 47.4 7 62 -25 -16 22 37 -16 31 52 -16 19 2 -16 35 27 0.40 -108 0 0 -16 0 50 3 31 45.5 8 62 -26 -15 56 12 -16 5 27 -15 52 38 -16 9 2 0.40 -107 0 0 -15 34 36 3 31 43.4 9 62 -27 -15 30 0 -15 39 13 -15 26 26 -15 42 48 0.41 -106 0 0 -15 8 35 3 31 41.0 10 61 -28 -15 3 59 -15 13 12 -15 0 25 -15 16 45 0.41 -105 0 0 -14 42 46 3 31 38.3 11 61 -29 -14 38 11 -14 47 23 -14 34 38 -14 50 56 0.42 -104 0 0 -14 17 11 3 31 35.3 12 61 -30 -14 12 36 -14 21 46 -14 9 3 -14 25 19 0.42 -103 0 0 -13 51 49 3 31 32.1 13 61 -31 -13 47 14 -13 56 24 -13 43 42 -13 59 57 0.42 -102 0 0 -13 26 42 3 31 28.7 14 60 -32 -13 22 7 -13 31 16 -13 18 36 -13 34 48 0.42 -101 0 0 -13 1 49 3 31 24.9 15 60 -33 -12 57 15 -13 6 23 -12 53 44 -13 9 55 0.43 -100 0 0 -12 37 12 3 31 21.0 16 60 -34 -12 32 39 -12 41 45 -12 29 8 -12 45 17 0.43 - 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1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.040", 0.005", 90.829° remarks: * orbital elements for (4677)Hiroshi : Mean anomaly = 12.7395620370 deg Arg. of pericenter = 53.8853711415 deg Long. of node = 11.8254715041 deg Inclination = 0.4797686646 deg Eccentricity = 0.1962198332 Semimajor axis = 3.1330076152 AU Perihelion dist = 2.5182493837 AU Mag: H = 12.95, G = 0.15 Epoch of elements : MJD 60649.13927800 TDT (2024 Dec 05.1393) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#452022Nov25,1.64,2024,12,5,3.342647,-0.013898,-0.394251,-4.861824,0.171166,-0.001894,-0.000032,0.000001,0.000000 -31.7641,24.1532,127.53,-22.42,False TYC 1877-00766-1,6.16082643,24.1572841,10.26,10.17,10.12,0.0,0,,6.18663608,24.1532320,6.35,5.95,0,0,0 4677,Hiroshi,16.51,14.138,1.5896,0,0,-1.965,0.95,,1.0,0 0,12.7148,2024,12,5,53.8854,11.8255,0.4798,0.19622,3.13301,2.51825,12.95,5.0,0.15 1.386,0.0403,0.0047,91,0.0048,Known errors,1.01,0,-1,-1 20241205_0766-1,60140.73 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org