IOTA/IOTA-ES occultation update for (90) Antiope / TYC 1276-00246-1 event on 2012 Nov 21, 03:29 UT Visible from Africa, Caribbean, Mexico Summary ------- On 2012 Nov 21 UT, the 124 km diameter asteroid (90) Antiope will occult a 10.8 mag star in the constellation Taurus for observers along a path across Africa, Caribbean, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.3 mag to 12.9 mag (the magnitude of the asteroid) for at most 8.8 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 90 * date and approx. time of event: 2012 Nov 21, 03:21 - 2012 Nov 21, 03:36 UT * geocentric midpoint of event [JD]: 2456252.64521667 * magnitude of target star: 10.8 * magnitude drop [mag]: 2.3 * estimated maximum duration [s]: 8.8 * Moon: 55 % sunlit, 92° distance * Sun: 172° distance * rough path description: Africa, Caribbean, Mexico The occultation path -------------------- * approximate projected width [km]: 125 * 1 sigma uncertainty interval [path widths]: +/- 0.53 * 1 sigma uncertainty interval [seconds]: +/- 5.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .039) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .039", 89° ) * approx speed of asteroid's shadow [km/s]: 14.0298 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1276-00246-1 by 90 Antiope on 2012 Nov 21 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 -138 0 0 - 0 17 44 3 36 38 1 69 -9 0 18 35 - 0 54 1 0 57 8 - 1 32 25 -137 0 0 0 5 55 3 36 38 2 69 -10 0 42 16 - 0 30 23 1 20 50 - 1 8 50 -136 0 0 0 29 42 3 36 38 3 69 -11 1 6 4 - 0 6 38 1 44 40 - 0 45 6 -135 0 0 0 53 36 3 36 37 4 69 -12 1 29 59 0 17 15 2 8 37 - 0 21 15 -134 0 0 1 17 36 3 36 36 5 69 -13 1 54 1 0 41 14 2 32 40 0 2 43 -133 0 0 1 41 42 3 36 36 6 69 -14 2 18 9 1 5 19 2 56 49 0 26 46 -132 0 0 2 5 54 3 36 35 7 69 -15 2 42 21 1 29 29 3 21 3 0 50 56 -131 0 0 2 30 11 3 36 33 9 69 -17 3 6 39 1 53 45 3 45 22 1 15 10 -130 0 0 2 54 31 3 36 32 10 69 -18 3 31 1 2 18 5 4 9 44 1 39 29 -129 0 0 3 18 56 3 36 30 11 69 -19 3 55 26 2 42 28 4 34 10 2 3 52 -128 0 0 3 43 23 3 36 29 12 69 -20 4 19 54 3 6 55 4 58 39 2 28 18 -127 0 0 4 7 53 3 36 27 13 69 -21 4 44 24 3 31 24 5 23 10 2 52 46 -126 0 0 4 32 25 3 36 25 14 69 -22 5 8 57 3 55 55 5 47 43 3 17 17 -125 0 0 4 56 58 3 36 23 15 69 -23 5 33 30 4 20 28 6 12 17 3 41 49 -124 0 0 5 21 31 3 36 21 16 69 -24 5 58 4 4 45 1 6 36 51 4 6 22 -123 0 0 5 46 5 3 36 18 17 70 -25 6 22 38 5 9 35 7 1 25 4 30 56 -122 0 0 6 10 38 3 36 16 18 70 -26 6 47 11 5 34 8 7 25 58 4 55 29 -121 0 0 6 35 10 3 36 13 19 70 -27 7 11 43 5 58 40 7 50 30 5 20 1 -120 0 0 6 59 41 3 36 10 20 70 -28 7 36 14 6 23 11 8 15 1 5 44 32 -119 0 0 7 24 9 3 36 7 21 70 -29 8 0 42 6 47 39 8 39 28 6 9 1 -118 0 0 7 48 35 3 36 4 22 70 -30 8 25 7 7 12 5 9 3 53 6 33 27 -117 0 0 8 12 57 3 36 1 23 70 -31 8 49 28 7 36 28 9 28 14 6 57 50 -116 0 0 8 37 15 3 35 57 24 71 -32 9 13 46 8 0 47 9 52 31 7 22 9 -115 0 0 9 1 29 3 35 54 26 71 -34 9 37 59 8 25 1 10 16 44 7 46 24 -114 0 0 9 25 37 3 35 50 27 71 -35 10 2 7 8 49 10 10 40 51 8 10 35 -113 0 0 9 49 41 3 35 46 28 71 -36 10 26 9 9 13 14 11 4 52 8 34 40 -112 0 0 10 13 38 3 35 42 29 71 -37 10 50 5 9 37 12 11 28 47 8 58 39 -111 0 0 10 37 28 3 35 38 30 71 -38 11 13 55 10 1 4 11 52 35 9 22 31 -110 0 0 11 1 11 3 35 34 31 72 -39 11 37 37 10 24 49 12 16 16 9 46 17 -109 0 0 11 24 47 3 35 30 32 72 -40 12 1 11 10 48 26 12 39 49 10 9 56 -108 0 0 11 48 15 3 35 25 33 72 -41 12 24 38 11 11 55 13 3 14 10 33 26 -107 0 0 12 11 34 3 35 21 34 72 -42 12 47 55 11 35 15 13 26 30 10 56 48 -106 0 0 12 34 44 3 35 16 35 73 -43 13 11 4 11 58 27 13 49 37 11 20 1 -105 0 0 12 57 44 3 35 11 36 73 -44 13 34 2 12 21 29 14 12 34 11 43 5 -104 0 0 13 20 35 3 35 6 37 73 -45 13 56 51 12 44 21 14 35 21 12 5 59 -103 0 0 13 43 15 3 35 1 38 74 -46 14 19 30 13 7 3 14 57 58 12 28 43 -102 0 0 14 5 44 3 34 56 39 74 -47 14 41 57 13 29 34 15 20 23 12 51 16 -101 0 0 14 28 2 3 34 51 40 74 -48 15 4 13 13 51 54 15 42 37 13 13 37 -100 0 0 14 50 8 3 34 46 41 75 -49 15 26 17 14 14 2 16 4 39 13 35 48 - 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2012 Nov 03 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.011, 78° remarks: * orbital elements for (90) Antiope : Mean anomaly = 92.97380852 deg Arg. of pericenter = 243.81540730 deg Long. of node = 70.22453127 deg Inclination = 2.21807587 deg Eccentricity = 0.15817563 Semimajor axis = 3.16255644 AU Perihelion dist = 2.66231710 AU Mag: H = 7.85, G = 0.15 Epoch of elements : MJD 56252.14500000 TDT (2012 Nov 21.145) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 21 90 Antiope 3h 29.1m UT 10.8 4 21 12.484 21 11 14.33TYC 1276-00246-1 12.4 12.9 124 8.8 2.284 -2.163 -3.77 -47.5175 21.188 124.20 -19.98 3.4852 -0.01395 0.11039 -7.85811 -0.97862 -0.00080 -0.00011 2000 92.59790820121119.00000243.815407 70.224531 2.2180760.15817563 3.1625564 2.6623171 8.3 5.00.15 RATE 1.7524540 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.039 89 1.53 0.039 1 84 171 0 1-3 056247.0020121121_0246-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org