IOTA/IOTA-ES occultation update for (1013) Tombecka / TYC 4941-00500-1 event on 2008 May 10, 14:46 UT Visible from China, Russia Summary ------- On 2008 May 10 UT, the 32 km diameter asteroid (1013) Tombecka will occult a 10.5 mag star in the constellation Virgo for observers along a path across China, Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.5 mag to 14.0 mag (the magnitude of the asteroid) for at most 6.7 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: 50 * date and approx. time of event: 2008 May 10, 14:25 - 2008 May 10, 15:04 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 3.5 * estimated maximum duration [s]: 6.7 * Moon: 33 % sunlit, 64° distance * Sun: 135° distance * rough path description: China, Russia The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 1.28 * 1 sigma uncertainty interval [seconds]: +/- 6.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .025", 116° ) * approx speed of asteroid's shadow [km/s]: 4.7808 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4941-00500-1 by 1013 Tombecka on 2008 May 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 ' " Longitude Longitude Longitude Longitude -179 51 34 64 0 0 14 25 52 4 261 -3 177 56 11 -177 5 26 173 29 14 ... .. .. 169 40 15 63 0 0 14 26 4 9 251 -7 168 28 50 170 55 36 165 40 14 174 32 45 Latitude Latitude Latitude Latitude 168 0 0 62 46 29 14 26 7 9 250 -7 62 56 1 62 36 57 63 20 27 62 12 37 167 0 0 62 37 50 14 26 9 10 249 -7 62 47 24 62 28 16 63 11 57 62 3 50 166 0 0 62 28 46 14 26 11 10 248 -8 62 38 23 62 19 10 63 3 2 61 54 38 165 0 0 62 19 17 14 26 14 11 247 -8 62 28 56 62 9 38 62 53 41 61 44 59 164 0 0 62 9 21 14 26 16 11 246 -8 62 19 3 61 59 40 62 43 55 61 34 54 163 0 0 61 58 59 14 26 18 12 245 -9 62 8 43 61 49 15 62 33 42 61 24 22 162 0 0 61 48 9 14 26 21 12 244 -9 61 57 57 61 38 22 62 23 3 61 13 23 161 0 0 61 36 52 14 26 24 13 244 -9 61 46 42 61 27 2 62 11 57 61 1 55 160 0 0 61 25 7 14 26 27 13 243 -10 61 35 0 61 15 14 62 0 22 60 49 59 159 0 0 61 12 53 14 26 30 14 242 -10 61 22 50 61 2 57 61 48 20 60 37 35 158 0 0 61 0 10 14 26 33 14 241 -10 61 10 10 60 50 11 61 35 48 60 24 40 157 0 0 60 46 57 14 26 36 15 240 -11 60 57 0 60 36 55 61 22 47 60 11 16 156 0 0 60 33 14 14 26 39 15 239 -11 60 43 21 60 23 8 61 9 16 59 57 21 155 0 0 60 19 0 14 26 43 16 238 -11 60 29 10 60 8 51 60 55 14 59 42 54 154 0 0 60 4 14 14 26 47 17 237 -12 60 14 28 59 54 1 60 40 41 59 27 56 153 0 0 59 48 56 14 26 51 17 237 -12 59 59 13 59 38 39 60 25 36 59 12 25 152 0 0 59 33 5 14 26 55 18 236 -12 59 43 26 59 22 45 60 9 58 58 56 20 151 0 0 59 16 40 14 26 59 18 235 -13 59 27 4 59 6 16 59 53 47 58 39 42 150 0 0 58 59 41 14 27 4 19 234 -13 59 10 9 58 49 13 59 37 2 58 22 29 149 0 0 58 42 6 14 27 8 19 233 -13 58 52 39 58 31 34 59 19 42 58 4 40 148 0 0 58 23 56 14 27 13 20 232 -14 58 34 32 58 13 20 59 1 46 57 46 16 147 0 0 58 5 9 14 27 18 21 231 -14 58 15 50 57 54 29 58 43 14 57 27 14 146 0 0 57 45 45 14 27 24 21 231 -14 57 56 30 57 35 0 58 24 5 57 7 35 145 0 0 57 25 42 14 27 29 22 230 -15 57 36 31 57 14 54 58 4 17 56 47 17 144 0 0 57 5 1 14 27 35 22 229 -15 57 15 54 56 54 8 57 43 51 56 26 21 143 0 0 56 43 39 14 27 41 23 228 -16 56 54 37 56 32 42 57 22 46 56 4 44 142 0 0 56 21 38 14 27 48 24 227 -16 56 32 40 56 10 36 57 1 0 55 42 26 141 0 0 55 58 54 14 27 54 24 226 -16 56 10 1 55 47 48 56 38 33 55 19 27 140 0 0 55 35 29 14 28 1 25 225 -17 55 46 40 55 24 18 56 15 24 54 55 46 139 0 0 55 11 20 14 28 8 26 225 -17 55 22 36 55 0 5 55 51 32 54 31 21 138 0 0 54 46 28 14 28 16 26 224 -17 54 57 49 54 35 8 55 26 56 54 6 12 137 0 0 54 20 51 14 28 23 27 223 -18 54 32 16 54 9 27 55 1 36 53 40 19 136 0 0 53 54 29 14 28 32 28 222 -18 54 5 59 53 43 0 54 35 30 53 13 40 135 0 0 53 27 20 14 28 40 29 221 -19 53 38 55 53 15 46 54 8 38 52 46 15 134 0 0 52 59 24 14 28 49 29 220 -19 53 11 4 52 47 46 53 41 0 52 18 3 133 0 0 52 30 41 14 28 58 30 220 -19 52 42 25 52 18 58 53 12 33 51 49 3 132 0 0 52 1 9 14 29 7 31 219 -20 52 12 58 51 49 22 52 43 18 51 19 15 131 0 0 51 30 49 14 29 17 32 218 -20 51 42 42 51 18 56 52 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0 17 37 11 14 43 54 70 156 -29 17 50 6 17 24 16 18 23 19 16 51 21 87 0 0 16 39 54 14 44 23 71 153 -29 16 52 47 16 27 2 17 25 53 15 54 13 86 0 0 15 42 41 14 44 53 71 149 -29 15 55 32 15 29 53 16 28 30 14 57 11 85 0 0 14 45 36 14 45 22 71 145 -29 14 58 23 14 32 50 15 31 14 14 0 15 84 0 0 13 48 39 14 45 52 72 141 -28 14 1 23 13 35 56 14 34 6 13 3 29 83 0 0 12 51 53 14 46 21 72 137 -28 13 4 34 12 39 13 13 37 9 12 6 54 82 0 0 11 55 21 14 46 51 72 133 -28 12 7 59 11 42 44 12 40 25 11 10 33 81 0 0 10 59 4 14 47 20 72 129 -27 11 11 38 10 46 30 11 43 56 10 14 27 80 0 0 10 3 4 14 47 50 72 125 -27 10 15 35 9 50 34 10 47 45 9 18 39 79 0 0 9 7 24 14 48 19 72 121 -27 9 19 52 8 54 57 9 51 52 8 23 11 78 0 0 8 12 5 14 48 49 71 117 -26 8 24 30 7 59 42 8 56 21 7 28 5 77 0 0 7 17 10 14 49 18 71 114 -26 7 29 31 7 4 50 8 1 13 6 33 22 76 0 0 6 22 40 14 49 47 70 110 -25 6 34 57 6 10 24 7 6 29 5 39 5 75 0 0 5 28 36 14 50 15 70 107 -25 5 40 50 5 16 24 6 12 13 4 45 14 74 0 0 4 35 2 14 50 44 69 104 -25 4 47 11 4 22 53 5 18 25 3 51 52 73 0 0 3 41 57 14 51 13 69 101 -24 3 54 3 3 29 52 4 25 6 2 59 1 72 0 0 2 49 24 14 51 41 68 99 -24 3 1 26 2 37 22 3 32 20 2 6 41 71 0 0 1 57 24 14 52 9 67 96 -23 2 9 22 1 45 26 2 40 6 1 14 54 70 0 0 1 5 58 14 52 36 66 94 -22 1 17 52 0 54 4 1 48 26 0 23 42 69 0 0 0 15 8 14 53 3 65 92 -22 0 26 59 0 3 18 0 57 23 - 0 26 55 68 0 0 - 0 35 5 14 53 30 65 90 -21 - 0 23 18 - 0 46 51 0 6 56 - 1 16 54 67 0 0 - 1 24 40 14 53 57 64 89 -21 - 1 12 57 - 1 36 22 - 0 42 53 - 2 6 15 66 0 0 - 2 13 36 14 54 23 63 87 -20 - 2 1 57 - 2 25 14 - 1 32 3 - 2 54 58 65 0 0 - 3 1 52 14 54 49 62 86 -20 - 2 50 16 - 3 13 26 - 2 20 32 - 3 43 0 64 0 0 - 3 49 26 14 55 15 61 84 -19 - 3 37 55 - 4 0 57 - 3 8 21 - 4 30 20 63 0 0 - 4 36 19 14 55 40 60 83 -18 - 4 24 51 - 4 47 45 - 3 55 27 - 5 16 59 62 0 0 - 5 22 28 14 56 5 59 82 -18 - 5 11 5 - 5 33 51 - 4 41 51 - 6 2 56 61 0 0 - 6 7 55 14 56 29 58 81 -17 - 5 56 35 - 6 19 14 - 5 27 31 - 6 48 8 60 0 0 - 6 52 37 14 56 53 57 81 -16 - 6 41 21 - 7 3 52 - 6 12 27 - 7 32 37 59 0 0 - 7 36 34 14 57 17 56 80 -16 - 7 25 22 - 7 47 46 - 6 56 38 - 8 16 21 58 0 0 - 8 19 46 14 57 40 55 79 -15 - 8 8 38 - 8 30 54 - 7 40 3 - 8 59 19 57 0 0 - 9 2 13 14 58 2 54 79 -14 - 8 51 8 - 9 13 16 - 8 22 43 - 9 41 32 56 0 0 - 9 43 53 14 58 25 53 78 -14 - 9 32 52 - 9 54 53 - 9 4 37 -10 22 59 55 0 0 -10 24 46 14 58 46 52 78 -13 -10 13 49 -10 35 42 - 9 45 43 -11 3 39 54 0 0 -11 4 52 14 59 8 51 77 -12 -10 53 59 -11 15 45 -10 26 3 -11 43 33 53 0 0 -11 44 12 14 59 29 50 77 -12 -11 33 22 -11 55 1 -11 5 35 -12 22 39 52 0 0 -12 22 43 14 59 49 49 77 -11 -12 11 57 -12 33 29 -11 44 20 -13 0 58 51 0 0 -13 0 28 15 0 9 48 76 -10 -12 49 45 -13 11 10 -12 22 17 -13 38 30 50 0 0 -13 37 24 15 0 28 47 76 -10 -13 26 45 -13 48 2 -12 59 26 -14 15 14 49 0 0 -14 13 32 15 0 47 46 76 -9 -14 2 57 -14 24 7 -13 35 47 -14 51 10 48 0 0 -14 48 53 15 1 6 45 76 -8 -14 38 21 -14 59 24 -14 11 20 -15 26 18 47 0 0 -15 23 26 15 1 24 44 76 -8 -15 12 57 -15 33 54 -14 46 5 -16 0 39 46 0 0 -15 57 10 15 1 42 43 76 -7 -15 46 45 -16 7 35 -15 20 1 -16 34 11 45 0 0 -16 30 7 15 1 59 42 76 -6 -16 19 45 -16 40 28 -15 53 10 -17 6 56 44 0 0 -17 2 16 15 2 16 41 76 -6 -16 51 57 -17 12 34 -16 25 30 -17 38 54 43 0 0 -17 33 37 15 2 32 40 76 -5 -17 23 21 -17 43 52 -16 57 2 -18 10 3 42 0 0 -18 4 10 15 2 48 39 76 -4 -17 53 58 -18 14 22 -17 27 47 -18 40 26 41 0 0 -18 33 56 15 3 3 38 76 -3 -18 23 47 -18 44 5 -17 57 44 -19 10 1 40 0 0 -19 2 54 15 3 18 37 76 -3 -18 52 48 -19 13 0 -18 26 53 -19 38 48 39 0 0 -19 31 6 15 3 33 36 76 -2 -19 21 2 -19 41 8 -18 55 15 -20 6 49 38 0 0 -19 58 30 15 3 47 35 76 -1 -19 48 29 -20 8 30 -19 22 50 -20 34 3 37 0 0 -20 25 7 15 4 0 34 76 -1 -20 15 10 -20 35 4 -19 49 37 -21 0 30 Uncertainty in time = +/- 9 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: TYC 4941-00500-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 21 57.4307 DE: -00 35 42.951 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 10.5 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1013) Tombecka approx. diameter [km]: 32 approx. diameter ["]: .027 distance from Earth [AU]: 1.61000 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 682 number of rejected observations: 69 time covered by the observations: 1905 Oct 25 - 2008 Apr 30 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.017, 125° remarks: * orbital elements for (1013) Tombecka : Mean anomaly = 53.17049187 deg Arg. of pericenter = 99.06985226 deg Long. of node = 27.47972270 deg Inclination = 11.88270455 deg Eccentricity = 0.21213525 Semimajor axis = 2.68069024 AU Perihelion dist = 2.11202135 AU Mag: H = 10.03, G = 0.15 Epoch of elements : MJD 54596.61600000 TDT (2008 May 10.616) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 10 1013 Tombecka 14h 46.9m UT 10.5 12 21 57.431- 0 35 42.95TYC 4941-00500-1 11.5 14.0 32 6.7 1.610 -0.679 -10.63 94.9954 -0.592 -42.62 17.83 14.7814 -0.22323 0.21475 -1.87043 -1.94497 0.00354 -0.00165 2000 51.6847972008 5 4.00000 99.069852 27.479723 11.8827050.21213525 2.6806902 2.112021310.1 5.00.15 RATE 2.2456090 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.025 116 2.28 0.035 0 54594.5020080510_0500-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 02:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org