IOTA/IOTA-ES occultation update for (767) Bondia / TYC 5818-00161-1 event on 2012 Sep 10, 01:26 UT Visible from Africa, Brazil, Argentina, Chile Summary ------- On 2012 Sep 10 UT, the 47 km diameter asteroid (767) Bondia will occult a 10.1 mag star in the constellation Aquarius for observers along a path across Africa, Brazil, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 13.4 mag (the magnitude of the asteroid) for at most 5.2 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: 75 * date and approx. time of event: 2012 Sep 10, 01:15 - 2012 Sep 10, 01:38 UT * geocentric midpoint of event [JD]: 2456180.56039583 * magnitude of target star: 10.1 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 5.2 * Moon: 36 % sunlit, 117° distance * Sun: 169° distance * rough path description: Africa, Brazil, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 48 * 1 sigma uncertainty interval [path widths]: +/- 0.76 * 1 sigma uncertainty interval [seconds]: +/- 5.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .046 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .047", .031", 76° ) * approx speed of asteroid's shadow [km/s]: 8.9739 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5818-00161-1 by 767 Bondia on 2012 Sep 10 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 ' " Latitude Latitude Latitude Latitude -118 0 0 -32 49 51 1 38 23 11 98 0 -32 36 46 -33 2 57 -32 16 54 -33 22 52 -117 0 0 -32 58 14 1 38 21 12 97 -1 -32 45 9 -33 11 18 -32 25 19 -33 31 12 -116 0 0 -33 6 14 1 38 19 13 96 -2 -32 53 11 -33 19 18 -32 33 21 -33 39 10 -115 0 0 -33 13 52 1 38 16 14 96 -3 -33 0 50 -33 26 56 -32 41 1 -33 46 47 -114 0 0 -33 21 9 1 38 13 15 95 -4 -33 8 7 -33 34 12 -32 48 20 -33 54 2 -113 0 0 -33 28 4 1 38 11 16 95 -5 -33 15 3 -33 41 6 -32 55 17 -34 0 55 -112 0 0 -33 34 38 1 38 8 16 94 -5 -33 21 37 -33 47 39 -33 1 52 -34 7 26 -111 0 0 -33 40 49 1 38 5 17 94 -6 -33 27 50 -33 53 50 -33 8 5 -34 13 37 -110 0 0 -33 46 40 1 38 2 18 93 -7 -33 33 40 -33 59 39 -33 13 57 -34 19 25 -109 0 0 -33 52 8 1 37 58 19 93 -8 -33 39 10 -34 5 7 -33 19 27 -34 24 53 -108 0 0 -33 57 16 1 37 55 20 92 -9 -33 44 18 -34 10 14 -33 24 36 -34 29 59 -107 0 0 -34 2 2 1 37 51 21 91 -10 -33 49 4 -34 15 0 -33 29 23 -34 34 43 -106 0 0 -34 6 26 1 37 48 21 91 -10 -33 53 29 -34 19 24 -33 33 49 -34 39 7 -105 0 0 -34 10 29 1 37 44 22 90 -11 -33 57 33 -34 23 27 -33 37 53 -34 43 9 -104 0 0 -34 14 12 1 37 40 23 90 -12 -34 1 15 -34 27 8 -33 41 36 -34 46 50 -103 0 0 -34 17 32 1 37 36 24 89 -13 -34 4 36 -34 30 29 -33 44 58 -34 50 10 -102 0 0 -34 20 32 1 37 31 25 89 -14 -34 7 37 -34 33 29 -33 47 58 -34 53 9 -101 0 0 -34 23 11 1 37 27 25 88 -14 -34 10 15 -34 36 7 -33 50 38 -34 55 48 -100 0 0 -34 25 29 1 37 23 26 87 -15 -34 12 33 -34 38 24 -33 52 56 -34 58 5 - 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2012 Aug 29 1 sigma uncertainty ellipse (major, minor, PA): 0.039, 0.019, 69° remarks: * orbital elements for (767) Bondia : Mean anomaly = 356.16218699 deg Arg. of pericenter = 266.95554958 deg Long. of node = 79.70128058 deg Inclination = 2.42038655 deg Eccentricity = 0.17505131 Semimajor axis = 3.12466389 AU Perihelion dist = 2.57768740 AU Mag: H = 10.05, G = 0.15 Epoch of elements : MJD 56180.06000000 TDT (2012 Sep 10.060) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 10 767 Bondia 1h 27.0m UT 10.1 22 40 42.967-12 34 1.05TYC 5818-00161-1 11.2 13.4 47 5.2 1.584 -1.793 -10.05 -31.0565 -12.564 157.50 4.84 1.4495 0.06295 -0.16331 -4.72977 -1.81232 0.00079 0.00072 2000 354.3670522012 831.00000266.955550 79.701281 2.4203870.17505131 3.1246639 2.577687410.0 5.00.15 RATE 1.7844280 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.047 0.031 76 1.76 0.031 0 0-4 3 056178.0020120910_0161-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 07, 22:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org