IOTA/IOTA-ES occultation update for (236) Honoria / TYC 0590-00068-1 event on 2012 Sep 07, 03:32 UT Visible from Europe, N Brazil, Peru Summary ------- On 2012 Sep 07 UT, the 81 km diameter asteroid (236) Honoria will occult a 10.9 mag star in the constellation Pisces for observers along a path across Europe, N Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 11.2 mag (the magnitude of the asteroid) for at most 10.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 97 * date and approx. time of event: 2012 Sep 07, 03:19 - 2012 Sep 07, 03:46 UT * geocentric midpoint of event [JD]: 2456177.64780417 * magnitude of target star: 10.9 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 10.5 * Moon: 64 % sunlit, 58° distance * Sun: 164° distance * rough path description: Europe, N Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .029", 81° ) * approx speed of asteroid's shadow [km/s]: 7.7648 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0590-00068-1 by 236 Honoria on 2012 Sep 7 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Longitude Longitude Longitude Longitude -123 43 22 -34 0 0 3 46 17 6 82 -23 -126 59 29 -121 6 18 -130 36 42 -119 19 26 -117 31 7 -33 0 0 3 46 5 12 79 -28 -119 34 52 -115 38 47 -121 22 12 -114 17 14 Latitude Latitude Latitude Latitude -117 0 0 -32 53 55 3 46 4 12 78 -28 -32 31 13 -33 16 35 -32 13 30 -33 34 16 -116 0 0 -32 41 43 3 46 1 13 78 -29 -32 18 57 -33 4 27 -32 1 12 -33 22 10 -115 0 0 -32 28 53 3 45 58 14 77 -30 -32 6 4 -32 51 41 -31 48 15 -33 9 27 -114 0 0 -32 15 25 3 45 55 15 77 -31 -31 52 32 -32 38 17 -31 34 41 -32 56 6 -113 0 0 -32 1 20 3 45 52 16 76 -32 -31 38 23 -32 24 16 -31 20 28 -32 42 8 -112 0 0 -31 46 36 3 45 49 16 76 -33 -31 23 35 -32 9 36 -31 5 37 -32 27 32 -111 0 0 -31 31 14 3 45 45 17 75 -34 -31 8 9 -31 54 19 -30 50 7 -32 12 18 -110 0 0 -31 15 14 3 45 41 18 75 -34 -30 52 3 -31 38 23 -30 33 58 -31 56 25 -109 0 0 -30 58 34 3 45 37 19 74 -35 -30 35 19 -31 21 48 -30 17 10 -31 39 54 -108 0 0 -30 41 15 3 45 33 20 74 -36 -30 17 55 -31 4 34 -29 59 42 -31 22 44 -107 0 0 -30 23 16 3 45 28 21 73 -37 -29 59 51 -30 46 40 -29 41 35 -31 4 54 -106 0 0 -30 4 38 3 45 23 22 73 -38 -29 41 8 -30 28 7 -29 22 47 -30 46 25 -105 0 0 -29 45 20 3 45 19 23 72 -39 -29 21 44 -30 8 54 -29 3 19 -30 27 16 -104 0 0 -29 25 21 3 45 13 24 72 -40 -29 1 40 -29 49 1 -28 43 11 -30 7 28 -103 0 0 -29 4 42 3 45 8 24 71 -41 -28 40 55 -29 28 27 -28 22 22 -29 46 58 -102 0 0 -28 43 22 3 45 2 25 71 -42 -28 19 30 -29 7 13 -28 0 51 -29 25 48 -101 0 0 -28 21 21 3 44 56 26 71 -43 -27 57 22 -28 45 18 -27 38 40 -29 3 58 -100 0 0 -27 58 38 3 44 50 27 70 -43 -27 34 34 -28 22 41 -27 15 46 -28 41 26 - 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2012 Aug 10 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.015, 75° remarks: * orbital elements for (236) Honoria : Mean anomaly = 355.11049203 deg Arg. of pericenter = 174.83555625 deg Long. of node = 186.05388563 deg Inclination = 7.68308644 deg Eccentricity = 0.18726486 Semimajor axis = 2.79969144 AU Perihelion dist = 2.27540762 AU Mag: H = 7.98, G = -0.02 Epoch of elements : MJD 56177.14700000 TDT (2012 Sep 07.147) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 7 236 Honoria 3h 32.8m UT 10.9 23 58 2.797 2 57 19.41TYC 0590-00068-1 11.8 11.2 81 10.5 1.293 -1.466 -20.16 -40.3201 2.961 126.29 5.94 3.5473 -0.09396 0.10147 -3.22919 -2.96313 -0.00129 -0.00085 2000 353.6067872012 831.00000174.835556186.053886 7.6830860.18726486 2.7996914 2.2754076 8.2 5.0-.02 RATE 2.1039670 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.029 81 1.39 0.033 0 0 1 1 056165.0020120907_0068-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 22:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org