IOTA/IOTA-ES occultation update for (402) Chloe / UCAC2 36248249 event on 2009 Jan 10, 02:20 UT Visible from Summary ------- On 2009 Jan 10 UT, the 54 km diameter asteroid (402) Chloe will occult a 11.8 mag star in the constellation Orion for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.0 mag to 12.3 mag (the magnitude of the asteroid) for at most 5.4 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: 54 * date and approx. time of event: 2009 Jan 10, 02:10 - 2009 Jan 10, 02:30 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 1.0 * estimated maximum duration [s]: 5.4 * Moon: 98 % sunlit, 15° distance * Sun: 156° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 54 * 1 sigma uncertainty interval [path widths]: +/- 1.17 * 1 sigma uncertainty interval [seconds]: +/- 6.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .064 +/- .060) * 1 sigma uncertainty ellipse (major, minor, PA): ( .064", .060", 89° ) * approx speed of asteroid's shadow [km/s]: 10.0712 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 36248249 by 402 Chloe on 2009 Jan 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 -140 0 0 32 36 21 2 30 48 14 84 -1 32 51 4 32 21 37 33 25 33 31 47 9 -139 0 0 32 42 16 2 30 46 15 84 -1 32 56 58 32 27 33 33 31 25 31 53 8 -138 0 0 32 47 44 2 30 43 16 85 -2 33 2 26 32 33 2 33 36 51 31 58 38 -137 0 0 32 52 45 2 30 41 17 85 -3 33 7 27 32 38 4 33 41 50 32 3 42 -136 0 0 32 57 20 2 30 38 18 86 -4 33 12 1 32 42 40 33 46 22 32 8 20 -135 0 0 33 1 28 2 30 35 18 86 -4 33 16 8 32 46 48 33 50 28 32 12 30 -134 0 0 33 5 10 2 30 32 19 87 -5 33 19 50 32 50 31 33 54 8 32 16 13 -133 0 0 33 8 25 2 30 29 20 87 -6 33 23 4 32 53 47 33 57 22 32 19 30 -132 0 0 33 11 14 2 30 26 21 88 -7 33 25 53 32 56 36 34 0 10 32 22 21 -131 0 0 33 13 37 2 30 22 22 89 -8 33 28 15 32 58 59 34 2 31 32 24 45 -130 0 0 33 15 34 2 30 19 23 89 -8 33 30 12 33 0 56 34 4 27 32 26 42 -129 0 0 33 17 4 2 30 15 23 90 -9 33 31 42 33 2 27 34 5 57 32 28 13 -128 0 0 33 18 9 2 30 12 24 90 -10 33 32 46 33 3 31 34 7 0 32 29 18 -127 0 0 33 18 47 2 30 8 25 91 -11 33 33 24 33 4 10 34 7 39 32 29 57 -126 0 0 33 18 59 2 30 4 26 91 -12 33 33 37 33 4 22 34 7 51 32 30 9 -125 0 0 33 18 46 2 30 0 27 92 -12 33 33 23 33 4 8 34 7 37 32 29 56 -124 0 0 33 18 6 2 29 56 28 92 -13 33 32 44 33 3 29 34 6 58 32 29 16 -123 0 0 33 17 1 2 29 52 28 93 -14 33 31 39 33 2 23 34 5 54 32 28 10 -122 0 0 33 15 30 2 29 47 29 93 -15 33 30 8 33 0 52 34 4 23 32 26 38 -121 0 0 33 13 33 2 29 43 30 94 -15 33 28 11 32 58 55 34 2 27 32 24 40 -120 0 0 33 11 10 2 29 38 31 95 -16 33 25 49 32 56 31 34 0 6 32 22 16 -119 0 0 33 8 21 2 29 33 32 95 -17 33 23 1 32 53 42 33 57 19 32 19 26 -118 0 0 33 5 7 2 29 28 32 96 -18 33 19 47 32 50 27 33 54 6 32 16 10 -117 0 0 33 1 27 2 29 24 33 96 -19 33 16 7 32 46 47 33 50 28 32 12 28 -116 0 0 32 57 21 2 29 18 34 97 -19 33 12 2 32 42 40 33 46 24 32 8 20 -115 0 0 32 52 49 2 29 13 35 97 -20 33 7 31 32 38 8 33 41 54 32 3 46 -114 0 0 32 47 52 2 29 8 36 98 -21 33 2 34 32 33 9 33 36 59 31 58 46 -113 0 0 32 42 28 2 29 3 37 98 -22 32 57 11 32 27 45 33 31 39 31 53 20 -112 0 0 32 36 39 2 28 57 37 99 -22 32 51 23 32 21 55 33 25 52 31 47 28 -111 0 0 32 30 24 2 28 51 38 99 -23 32 45 9 32 15 39 33 19 40 31 41 10 -110 0 0 32 23 43 2 28 46 39 100 -24 32 38 29 32 8 58 33 13 3 31 34 26 -109 0 0 32 16 36 2 28 40 40 101 -25 32 31 23 32 1 50 33 5 59 31 27 15 -108 0 0 32 9 4 2 28 34 41 101 -26 32 23 52 31 54 16 32 58 30 31 19 39 -107 0 0 32 1 5 2 28 28 42 102 -26 32 15 54 31 46 16 32 50 36 31 11 37 -106 0 0 31 52 41 2 28 22 42 102 -27 32 7 31 31 37 50 32 42 15 31 3 8 -105 0 0 31 43 50 2 28 15 43 103 -28 31 58 41 31 28 59 32 33 29 30 54 13 -104 0 0 31 34 33 2 28 9 44 103 -29 31 49 26 31 19 41 32 24 16 30 44 52 -103 0 0 31 24 51 2 28 2 45 104 -29 31 39 45 31 9 56 32 14 38 30 35 5 -102 0 0 31 14 42 2 27 55 46 104 -30 31 29 37 30 59 46 32 4 34 30 24 52 -101 0 0 31 4 7 2 27 49 47 105 -31 31 19 4 30 49 10 31 54 4 30 14 12 -100 0 0 30 53 5 2 27 42 47 105 -32 31 8 4 30 38 7 31 43 8 30 3 5 - 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2008 Oct 17 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.013, 82° remarks: * orbital elements for (402) Chloe : Mean anomaly = 318.78845729 deg Arg. of pericenter = 17.83807459 deg Long. of node = 129.52750082 deg Inclination = 11.82310819 deg Eccentricity = 0.11286091 Semimajor axis = 2.55873730 AU Perihelion dist = 2.26995589 AU Mag: H = 8.91, G = 0.15 Epoch of elements : MJD 54841.09800000 TDT (2009 Jan 10.098) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 10 402 Chloe 2h 20.6m UT 11.8 5 53 32.278 12 49 38.89UCAC2 36248249 0.0 12.3 54 5.4 1.424 -2.119 16.44 -56.5118 12.823 146.72 -21.95 2.3433 0.02113 0.04054 -5.02257 2.66214 0.00210 0.00100 2000 318.5240532009 1 9.00000 17.838075129.527501 11.8231080.11286091 2.5587373 2.2699559 9.0 5.00.15 RATE 2.4080500 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.064 0.060 89 2.17 0.061 0 54774.5020090110_248249 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 04, 05:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org