IOTA/IOTA-ES occultation update for (279) Thule / TYC 4972-00415-1 event on 2008 Apr 03, 11:51 UT Visible from Japan Summary ------- On 2008 Apr 03 UT, the 127 km diameter asteroid (279) Thule will occult a 11.4 mag star in the constellation Virgo for observers along a path across Japan. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.2 mag to 14.5 mag (the magnitude of the asteroid) for at most 8.6 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: 92 * date and approx. time of event: 2008 Apr 03, 11:45 - 2008 Apr 03, 11:58 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 3.2 * estimated maximum duration [s]: 8.6 * Moon: 9 % sunlit, 134° distance * Sun: 170° distance * rough path description: Japan The occultation path -------------------- * approximate projected width [km]: 137 * 1 sigma uncertainty interval [path widths]: +/- 0.49 * 1 sigma uncertainty interval [seconds]: +/- 5.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .037 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .037", .027", 107° ) * approx speed of asteroid's shadow [km/s]: 14.7578 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4972-00415-1 by 279 Thule on 2008 Apr 3 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 108 0 0 42 58 11 11 58 43 0 100 -8 43 35 59 42 20 33 .. .. .. 41 43 49 109 0 0 42 50 28 11 58 43 1 100 -9 43 28 19 42 12 48 44 5 35 41 36 2 110 0 0 42 42 27 11 58 42 2 101 -10 43 20 21 42 4 44 43 57 40 41 27 55 111 0 0 42 34 7 11 58 42 2 102 -11 43 12 4 41 56 21 43 49 26 41 19 29 112 0 0 42 25 29 11 58 42 3 102 -11 43 3 29 41 47 40 43 40 54 41 10 45 113 0 0 42 16 32 11 58 42 4 103 -12 42 54 35 41 38 40 43 32 3 41 1 43 114 0 0 42 7 17 11 58 41 5 104 -13 42 45 23 41 29 21 43 22 54 40 52 21 115 0 0 41 57 43 11 58 41 5 104 -14 42 35 52 41 19 44 43 13 26 40 42 41 116 0 0 41 47 50 11 58 40 6 105 -14 42 26 3 41 9 48 43 3 40 40 32 42 117 0 0 41 37 39 11 58 39 7 106 -15 42 15 55 40 59 34 42 53 35 40 22 24 118 0 0 41 27 9 11 58 38 8 106 -16 42 5 28 40 49 1 42 43 12 40 11 48 119 0 0 41 16 21 11 58 38 9 107 -17 41 54 44 40 38 9 42 32 31 40 0 53 120 0 0 41 5 14 11 58 37 9 108 -17 41 43 40 40 26 59 42 21 31 39 49 40 121 0 0 40 53 49 11 58 36 10 108 -18 41 32 18 40 15 30 42 10 13 39 38 8 122 0 0 40 42 5 11 58 34 11 109 -19 41 20 38 40 3 43 41 58 36 39 26 17 123 0 0 40 30 3 11 58 33 12 110 -20 41 8 40 39 51 38 41 46 41 39 14 8 124 0 0 40 17 43 11 58 32 12 110 -20 40 56 23 39 39 13 41 34 27 39 1 41 125 0 0 40 5 4 11 58 30 13 111 -21 40 43 47 39 26 31 41 21 56 38 48 55 126 0 0 39 52 6 11 58 29 14 112 -22 40 30 54 39 13 30 41 9 6 38 35 50 127 0 0 39 38 51 11 58 27 15 112 -23 40 17 42 39 0 11 40 55 58 38 22 28 128 0 0 39 25 17 11 58 26 16 113 -24 40 4 12 38 46 34 40 42 31 38 8 47 129 0 0 39 11 25 11 58 24 16 114 -24 39 50 24 38 32 38 40 28 47 37 54 48 130 0 0 38 57 15 11 58 22 17 114 -25 39 36 17 38 18 24 40 14 44 37 40 31 131 0 0 38 42 47 11 58 20 18 115 -26 39 21 53 38 3 53 40 0 23 37 25 56 132 0 0 38 28 1 11 58 18 19 116 -27 39 7 11 37 49 3 39 45 45 37 11 3 133 0 0 38 12 58 11 58 16 20 116 -28 38 52 11 37 33 56 39 30 49 36 55 52 134 0 0 37 57 36 11 58 13 20 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0 1 26 50 11 46 52 36 260 -26 2 4 25 0 49 26 2 41 24 0 12 56 -111 0 0 1 19 26 11 46 48 35 261 -25 1 56 58 0 42 3 2 33 56 0 5 35 -110 0 0 1 12 25 11 46 43 34 261 -24 1 49 56 0 35 4 2 26 52 - 0 1 23 -109 0 0 1 5 48 11 46 39 33 261 -23 1 43 17 0 28 28 2 20 12 - 0 7 57 -108 0 0 0 59 35 11 46 35 32 261 -22 1 37 3 0 22 17 2 13 56 - 0 14 7 -107 0 0 0 53 46 11 46 30 31 261 -21 1 31 13 0 16 29 2 8 5 - 0 19 54 -106 0 0 0 48 21 11 46 26 30 261 -20 1 25 47 0 11 6 2 2 37 - 0 25 16 -105 0 0 0 43 21 11 46 22 29 262 -19 1 20 45 0 6 6 1 57 35 - 0 30 14 -104 0 0 0 38 45 11 46 19 28 262 -18 1 16 8 0 1 32 1 52 57 - 0 34 48 -103 0 0 0 34 34 11 46 15 27 262 -17 1 11 56 - 0 2 39 1 48 44 - 0 38 58 -102 0 0 0 30 47 11 46 11 26 262 -16 1 8 8 - 0 6 25 1 44 55 - 0 42 43 -101 0 0 0 27 24 11 46 8 25 262 -15 1 4 45 - 0 9 47 1 41 31 - 0 46 4 -100 0 0 0 24 27 11 46 4 24 262 -14 1 1 47 - 0 12 44 1 38 32 - 0 49 0 - 99 0 0 0 21 54 11 46 1 23 262 -13 0 59 14 - 0 15 16 1 35 59 - 0 51 32 - 98 0 0 0 19 46 11 45 58 22 262 -12 0 57 5 - 0 17 24 1 33 50 - 0 53 40 - 97 0 0 0 18 3 11 45 55 21 262 -11 0 55 22 - 0 19 7 1 32 6 - 0 55 22 - 96 0 0 0 16 44 11 45 52 20 262 -10 0 54 3 - 0 20 25 1 30 47 - 0 56 40 - 95 0 0 0 15 51 11 45 50 19 262 -9 0 53 10 - 0 21 18 1 29 54 - 0 57 33 - 94 0 0 0 15 23 11 45 47 18 262 -8 0 52 42 - 0 21 46 1 29 26 - 0 58 2 - 93 0 0 0 15 20 11 45 45 17 263 -7 0 52 39 - 0 21 50 1 29 23 - 0 58 5 - 92 0 0 0 15 41 11 45 42 16 263 -6 0 53 1 - 0 21 28 1 29 46 - 0 57 44 - 91 0 0 0 16 29 11 45 40 15 263 -5 0 53 48 - 0 20 41 1 30 33 - 0 56 57 - 90 0 0 0 17 41 11 45 38 14 263 -4 0 55 1 - 0 19 30 1 31 47 - 0 55 46 - 89 0 0 0 19 18 11 45 36 13 263 -3 0 56 39 - 0 17 53 1 33 25 - 0 54 10 - 88 0 0 0 21 21 11 45 34 12 263 -2 0 58 43 - 0 15 51 1 35 30 - 0 52 8 - 87 0 0 0 23 49 11 45 33 11 263 -1 1 1 12 - 0 13 23 1 37 59 - 0 49 42 - 86 0 0 0 26 42 11 45 31 10 263 0 1 4 6 - 0 10 31 1 40 55 - 0 46 50 Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: TYC 4972-00415-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 13 31 42.3082 DE: -06 59 53.701 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .022 ) * V mag [mag]: 11.4 * B mag [mag]: 11.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (279) Thule approx. diameter [km]: 127 approx. diameter ["]: .054 distance from Earth [AU]: 3.24700 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 992 number of rejected observations: 80 time covered by the observations: 1902 Apr 07 - 2008 Mar 26 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.016, 113° remarks: * orbital elements for (279) Thule : Mean anomaly = 41.36018858 deg Arg. of pericenter = 85.63447933 deg Long. of node = 73.62867316 deg Inclination = 2.33797000 deg Eccentricity = 0.01109543 Semimajor axis = 4.27049006 AU Perihelion dist = 4.22310714 AU Mag: H = 8.33, G = 0.15 Epoch of elements : MJD 54559.49400000 TDT (2008 Apr 03.494) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 3 279 Thule 11h 52.1m UT 11.4 13 31 42.308- 6 59 53.70TYC 4972-00415-1 11.6 14.5 127 8.6 3.247 -1.416 8.05 -167.2718 -7.000 2.78 5.56 11.8676 0.13535 0.35394 -7.78115 2.97292 -0.00106 0.00015 2000 40.2998702008 325.00000 85.634479 73.628673 2.3379700.01109543 4.2704901 4.2231071 8.6 5.00.15 RATE 1.1168310 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.037 0.027 107 1.49 0.027 0 54553.5020080403_0415-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org