IOTA/IOTA-ES occultation update for (231) Vindobona / TYC 0613-00905-1 event on 2007 Aug 02, 08:57 UT Visible from E USA, Mexico Summary ------- On 2007 Aug 02 UT, the 82 km diameter asteroid (231) Vindobona will occult a 11.6 mag star in the constellation Pisces for observers along a path across E USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.0 mag to 14.5 mag (the magnitude of the asteroid) for at most 14.7 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: 84 * date and approx. time of event: 2007 Aug 02, 08:43 - 2007 Aug 02, 09:17 UT * midpoint of event [JD]: 2454314.87539167 * magnitude of target star: 11.6 * magnitude drop [mag]: 3.0 * estimated maximum duration [s]: 14.7 * Moon: 87 % sunlit, 28° distance * Sun: 109° distance * rough path description: E USA, Mexico The occultation path -------------------- * approximate projected width [km]: 91 * 1 sigma uncertainty interval [path widths]: +/- 0.62 * 1 sigma uncertainty interval [seconds]: +/- 9.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .028", 73° ) * approx speed of asteroid's shadow [km/s]: 5.5731 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0613-00905-1 by 231 Vindobona on 2007 Aug 02 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 -147 35 57 -16 0 0 8 43 24 3 80 -72 -145 35 3 -149 55 18 -143 22 12 ... .. .. -143 11 51 -15 0 0 8 43 33 7 79 -76 -141 36 5 -144 55 57 -139 46 20 -147 20 50 Latitude Latitude Latitude Latitude -143 0 0 -14 56 55 8 43 33 7 79 -76 -15 22 37 -14 31 7 -15 54 21 -13 58 59 -142 0 0 -14 40 49 8 43 36 8 78 -77 -15 6 37 -14 14 54 -15 38 29 -13 42 38 -141 0 0 -14 23 50 8 43 40 9 78 -78 -14 49 45 -13 57 48 -15 21 45 -13 25 23 -140 0 0 -14 5 57 8 43 44 10 78 -79 -14 32 0 -13 39 49 -15 4 8 -13 7 14 -139 0 0 -13 47 11 8 43 48 11 78 -80 -14 13 21 -13 20 54 -14 45 38 -12 48 10 -138 0 0 -13 27 29 8 43 53 12 77 -81 -13 53 47 -13 1 5 -14 26 15 -12 28 11 -137 0 0 -13 6 52 8 43 58 13 77 -81 -13 33 18 -12 40 20 -14 5 56 -12 7 15 -136 0 0 -12 45 19 8 44 4 15 77 -82 -13 11 54 -12 18 38 -13 44 42 -11 45 22 -135 0 0 -12 22 49 8 44 10 16 77 -82 -12 49 33 -11 55 58 -13 22 32 -11 22 31 -134 0 0 -11 59 21 8 44 16 17 77 -83 -12 26 14 -11 32 20 -12 59 24 -10 58 41 -133 0 0 -11 34 53 8 44 23 18 77 -83 -12 1 56 -11 7 43 -12 35 19 -10 33 51 -132 0 0 -11 9 27 8 44 31 19 76 -83 -11 36 40 -10 42 6 -12 10 15 -10 8 1 -131 0 0 -10 43 0 8 44 39 20 76 -83 -11 10 23 -10 15 28 -11 44 11 - 9 41 10 -130 0 0 -10 15 31 8 44 48 21 76 -82 -10 43 6 - 9 47 48 -11 17 7 - 9 13 16 -129 0 0 - 9 47 0 8 44 57 22 76 -82 -10 14 46 - 9 19 6 -10 49 2 - 8 44 19 -128 0 0 - 9 17 26 8 45 7 23 76 -81 - 9 45 24 - 8 49 20 -10 19 54 - 8 14 17 -127 0 0 - 8 46 48 8 45 17 24 76 -80 - 9 14 58 - 8 18 29 - 9 49 43 - 7 43 11 -126 0 0 - 8 15 5 8 45 28 25 76 -80 - 8 43 28 - 7 46 33 - 9 18 28 - 7 10 59 -125 0 0 - 7 42 16 8 45 39 27 76 -79 - 8 10 52 - 7 13 31 - 8 46 9 - 6 37 40 -124 0 0 - 7 8 20 8 45 51 28 76 -78 - 7 37 10 - 6 39 21 - 8 12 43 - 6 3 13 -123 0 0 - 6 33 17 8 46 4 29 76 -77 - 7 2 21 - 6 4 4 - 7 38 11 - 5 27 37 -122 0 0 - 5 57 5 8 46 17 30 76 -76 - 6 26 23 - 5 27 37 - 7 2 31 - 4 50 52 -121 0 0 - 5 19 44 8 46 30 31 76 -75 - 5 49 17 - 4 50 1 - 6 25 43 - 4 12 56 -120 0 0 - 4 41 12 8 46 45 32 76 -74 - 5 11 1 - 4 11 14 - 5 47 46 - 3 33 49 -119 0 0 - 4 1 30 8 47 0 34 76 -72 - 4 31 35 - 3 31 15 - 5 8 39 - 2 53 30 -118 0 0 - 3 20 36 8 47 16 35 77 -71 - 3 50 57 - 2 50 5 - 4 28 21 - 2 11 59 -117 0 0 - 2 38 30 8 47 32 36 77 -70 - 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99 0 0 13 24 36 8 54 20 57 94 -45 12 48 6 14 1 22 12 3 12 14 47 22 - 98 0 0 14 28 23 8 54 48 58 96 -43 13 51 34 15 5 30 13 6 16 15 51 55 - 97 0 0 15 32 59 8 55 17 59 98 -42 14 55 51 16 10 25 14 10 10 16 57 14 - 96 0 0 16 38 19 8 55 46 60 101 -40 16 0 52 17 16 4 15 14 49 18 3 17 - 95 0 0 17 44 19 8 56 16 61 103 -39 17 6 34 18 22 22 16 20 10 19 9 58 - 94 0 0 18 50 54 8 56 46 61 106 -37 18 12 52 19 29 14 17 26 7 20 17 12 - 93 0 0 19 57 59 8 57 16 62 109 -36 19 19 41 20 36 35 18 32 35 21 24 54 - 92 0 0 21 5 28 8 57 46 63 112 -34 20 26 54 21 44 20 19 39 30 22 32 58 - 91 0 0 22 13 16 8 58 16 63 116 -33 21 34 28 22 52 22 20 46 47 23 41 18 - 90 0 0 23 21 16 8 58 47 64 119 -31 22 42 16 24 0 36 21 54 18 24 49 49 - 89 0 0 24 29 24 8 59 17 64 122 -30 23 50 11 25 8 55 23 1 59 25 58 23 - 88 0 0 25 37 32 8 59 47 64 126 -28 24 58 9 26 17 14 24 9 44 27 6 55 - 87 0 0 26 45 35 9 0 18 64 130 -27 26 6 3 27 25 26 25 17 27 28 15 19 - 86 0 0 27 53 27 9 0 48 64 133 -25 27 13 46 28 33 26 26 25 1 29 23 28 - 85 0 0 29 1 0 9 1 18 64 137 -24 28 21 14 29 41 6 27 32 20 30 31 16 - 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2007 May 25 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.018, 63° remarks: * orbital elements for (231) Vindobona : Mean anomaly = 85.53018076 deg Arg. of pericenter = 267.04042542 deg Long. of node = 350.87890617 deg Inclination = 5.09655888 deg Eccentricity = 0.15709084 Semimajor axis = 2.91846253 AU Perihelion dist = 2.45999881 AU Mag: H = 9.43, G = 0.15 Epoch of elements : MJD 54314.37300000 TDT (2007 Aug 02.373) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 02 231 Vindobona 9h 0.6m UT 11.6 1 13 5.320 8 56 37.26TYC 0613-00905-1 12.3 14.5 82 14.7 2.459 0.561 7.56 -67.450 8.942 46.44 17.82 9.0094 -.29101 .32020 2.32833 2.11512 -0.00487 -0.00203 2000 84.66570612007 729.00000267.040425350.878906 5.0965590.157090842.918462532.459998819.2 5 0.15 RATE 1.9768462 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.032 0.028 73.5 1.620 0.028 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 09, 00:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org