IOTA/IOTA-ES occultation update for (138) Tolosa / TYC 1238-00600-1 event on 2009 Nov 06, 04:41 UT Visible from Summary ------- On 2009 Nov 06 UT, the 46 km diameter asteroid (138) Tolosa will occult a 11.4 mag star in the constellation Taurus 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 11.9 mag (the magnitude of the asteroid) for at most 4.2 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: 83 * date and approx. time of event: 2009 Nov 06, 04:33 - 2009 Nov 06, 04:51 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 1.0 * estimated maximum duration [s]: 4.2 * Moon: 86 % sunlit, 33° distance * Sun: 169° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 49 * 1 sigma uncertainty interval [path widths]: +/- 0.63 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .028", 79° ) * approx speed of asteroid's shadow [km/s]: 10.9475 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1238-00600-1 by 138 Tolosa on 2009 Nov 6 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 -159 0 0 11 43 36 4 51 8 0 71 -11 11 57 39 11 29 33 12 15 24 11 11 54 -158 0 0 12 4 11 4 51 8 1 71 -12 12 18 15 11 50 7 12 36 1 11 32 27 -157 0 0 12 24 56 4 51 8 2 71 -13 12 39 1 12 10 52 12 56 48 11 53 10 -156 0 0 12 45 50 4 51 7 3 72 -14 12 59 57 12 31 45 13 17 45 12 14 3 -155 0 0 13 6 54 4 51 6 4 72 -15 13 21 1 12 52 48 13 38 50 12 35 5 -154 0 0 13 28 6 4 51 6 6 72 -16 13 42 14 13 14 0 14 0 4 12 56 15 -153 0 0 13 49 26 4 51 4 7 72 -17 14 3 35 13 35 19 14 21 26 13 17 34 -152 0 0 14 10 54 4 51 3 8 73 -18 14 25 3 13 56 46 14 42 55 13 39 0 -151 0 0 14 32 29 4 51 1 9 73 -19 14 46 39 14 18 20 15 4 31 14 0 33 -150 0 0 14 54 10 4 51 0 10 73 -20 15 8 20 14 40 1 15 26 14 14 22 13 -149 0 0 15 15 57 4 50 58 11 73 -21 15 30 8 15 1 47 15 48 2 14 43 58 -148 0 0 15 37 49 4 50 55 12 74 -22 15 52 1 15 23 39 16 9 56 15 5 50 -147 0 0 15 59 47 4 50 53 13 74 -23 16 13 59 15 45 36 16 31 55 15 27 46 -146 0 0 16 21 49 4 50 51 14 74 -24 16 36 1 16 7 37 16 53 58 15 49 46 -145 0 0 16 43 54 4 50 48 15 75 -25 16 58 7 16 29 42 17 16 4 16 11 51 -144 0 0 17 6 3 4 50 45 16 75 -26 17 20 17 16 51 51 17 38 14 16 33 58 -143 0 0 17 28 14 4 50 42 17 75 -27 17 42 29 17 14 2 18 0 27 16 56 9 -142 0 0 17 50 28 4 50 39 18 76 -28 18 4 43 17 36 15 18 22 42 17 18 22 -141 0 0 18 12 44 4 50 35 19 76 -29 18 26 59 17 58 30 18 44 58 17 40 37 -140 0 0 18 35 1 4 50 32 20 76 -30 18 49 16 18 20 47 19 7 15 18 2 53 -139 0 0 18 57 18 4 50 28 21 77 -31 19 11 34 18 43 4 19 29 34 18 25 10 -138 0 0 19 19 36 4 50 24 22 77 -32 19 33 51 19 5 21 19 51 52 18 47 27 -137 0 0 19 41 53 4 50 20 23 77 -33 19 56 9 19 27 38 20 14 10 19 9 43 -136 0 0 20 4 9 4 50 16 24 78 -34 20 18 25 19 49 54 20 36 26 19 31 59 -135 0 0 20 26 24 4 50 11 25 78 -35 20 40 41 20 12 9 20 58 42 19 54 14 -134 0 0 20 48 37 4 50 7 26 79 -36 21 2 54 20 34 22 21 20 55 20 16 27 -133 0 0 21 10 48 4 50 2 27 79 -37 21 25 5 20 56 33 21 43 6 20 38 37 -132 0 0 21 32 56 4 49 57 28 79 -37 21 47 13 21 18 41 22 5 14 21 0 45 -131 0 0 21 55 1 4 49 52 29 80 -38 22 9 17 21 40 46 22 27 19 21 22 50 -130 0 0 22 17 2 4 49 47 29 80 -39 22 31 18 22 2 46 22 49 20 21 44 51 -129 0 0 22 38 58 4 49 41 30 81 -40 22 53 15 22 24 43 23 11 16 22 6 47 -128 0 0 23 0 50 4 49 36 31 81 -41 23 15 6 22 46 35 23 33 8 22 28 39 -127 0 0 23 22 37 4 49 30 32 82 -42 23 36 53 23 8 22 23 54 54 22 50 26 -126 0 0 23 44 18 4 49 25 33 82 -43 23 58 34 23 30 3 24 16 34 23 12 8 -125 0 0 24 5 52 4 49 19 34 83 -44 24 20 8 23 51 38 24 38 9 23 33 43 -124 0 0 24 27 21 4 49 13 35 84 -45 24 41 37 24 13 6 24 59 37 23 55 12 -123 0 0 24 48 42 4 49 7 36 84 -46 25 2 58 24 34 28 25 20 58 24 16 34 -122 0 0 25 9 56 4 49 1 37 85 -46 25 24 12 24 55 43 25 42 11 24 37 49 -121 0 0 25 31 3 4 48 55 38 85 -47 25 45 18 25 16 49 26 3 17 24 58 56 -120 0 0 25 52 1 4 48 48 39 86 -48 26 6 15 25 37 48 26 24 14 25 19 55 -119 0 0 26 12 51 4 48 42 40 87 -49 26 27 5 25 58 38 26 45 3 25 40 46 -118 0 0 26 33 32 4 48 35 41 87 -50 26 47 45 26 19 19 27 5 43 26 1 28 -117 0 0 26 54 3 4 48 29 41 88 -51 27 8 16 26 39 51 27 26 13 26 22 0 -116 0 0 27 14 25 4 48 22 42 89 -51 27 28 38 27 0 14 27 46 34 26 42 23 -115 0 0 27 34 37 4 48 15 43 90 -52 27 48 49 27 20 26 28 6 45 27 2 36 -114 0 0 27 54 39 4 48 8 44 90 -53 28 8 50 27 40 29 28 26 45 27 22 39 -113 0 0 28 14 30 4 48 1 45 91 -54 28 28 41 28 0 20 28 46 35 27 42 32 -112 0 0 28 34 10 4 47 54 46 92 -55 28 48 20 28 20 1 29 6 14 28 2 13 -111 0 0 28 53 39 4 47 47 47 93 -55 29 7 48 28 39 30 29 25 41 28 21 43 -110 0 0 29 12 56 4 47 40 47 94 -56 29 27 5 28 58 48 29 44 57 28 41 2 -109 0 0 29 32 1 4 47 32 48 95 -57 29 46 10 29 17 54 30 4 1 29 0 9 -108 0 0 29 50 55 4 47 25 49 95 -58 30 5 3 29 36 48 30 22 53 29 19 4 -107 0 0 30 9 36 4 47 18 50 96 -58 30 23 43 29 55 30 30 41 32 29 37 47 -106 0 0 30 28 4 4 47 10 51 97 -59 30 42 10 30 13 59 30 59 59 29 56 17 -105 0 0 30 46 20 4 47 3 51 98 -60 31 0 25 30 32 16 31 18 12 30 14 34 -104 0 0 31 4 22 4 46 55 52 99 -60 31 18 27 30 50 19 31 36 13 30 32 38 -103 0 0 31 22 11 4 46 47 53 100 -61 31 36 15 31 8 9 31 54 0 30 50 29 -102 0 0 31 39 47 4 46 40 54 102 -61 31 53 50 31 25 45 32 11 34 31 8 6 -101 0 0 31 57 8 4 46 32 54 103 -62 32 11 11 31 43 8 32 28 54 31 25 30 -100 0 0 32 14 16 4 46 24 55 104 -63 32 28 18 32 0 16 32 46 0 31 42 40 - 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2008 Feb 12 1 sigma uncertainty ellipse (major, minor, PA): 0.026, 0.016, 73° remarks: * orbital elements for (138) Tolosa : Mean anomaly = 77.06489044 deg Arg. of pericenter = 259.77427199 deg Long. of node = 54.91483713 deg Inclination = 3.20718624 deg Eccentricity = 0.16260996 Semimajor axis = 2.44803265 AU Perihelion dist = 2.04995815 AU Mag: H = 8.69, G = 0.15 Epoch of elements : MJD 55141.19600000 TDT (2009 Nov 06.196) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Nov 6 138 Tolosa 4h 42.1m UT 11.4 3 31 8.287 18 36 55.61TYC 1238-00600-1 12.2 11.9 46 4.2 1.443 -2.621 -5.56 -63.2665 18.618 105.40 -16.01 4.7009 -0.05179 0.34898 -6.11156 -0.91109 -0.00111 -0.00024 2000 76.757132200911 5.00000259.774272 54.914837 3.2071860.16260996 2.4480327 2.0499582 8.8 5.00.15 RATE 2.5732280 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.028 79 1.63 0.028 0 54545.5020091106_0600-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 16:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org