IOTA/IOTA-ES occultation update for (81) Terpsichore / TYC 1811-01716-1 event on 2010 Feb 11, 03:00 UT Visible from Canada Summary ------- On 2010 Feb 11 UT, the 119 km diameter asteroid (81) Terpsichore will occult a 11.1 mag star in the constellation Taurus for observers along a path across Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 13.0 mag (the magnitude of the asteroid) for at most 7.3 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: 99 * date and approx. time of event: 2010 Feb 11, 02:59 - 2010 Feb 11, 03:06 UT * magnitude of target star: 11.1 * magnitude drop [mag]: 2.1 * estimated maximum duration [s]: 7.3 * Moon: 8 % sunlit, 129° distance * Sun: 97° distance * rough path description: Canada The occultation path -------------------- * approximate projected width [km]: 134 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .025 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .023", 80° ) * approx speed of asteroid's shadow [km/s]: 16.2122 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1811-01716-1 by 81 Terpsichore on 2010 Feb 11 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 -151 0 0 54 28 44 2 59 37 61 142 0 53 51 39 55 6 3 53 30 57 55 27 2 -150 0 0 54 37 15 2 59 41 61 144 -1 54 0 14 55 14 28 53 39 36 55 35 24 -149 0 0 54 45 23 2 59 45 61 146 -2 54 8 27 55 22 32 53 47 52 55 43 25 -148 0 0 54 53 10 2 59 49 61 148 -2 54 16 19 55 30 13 53 55 46 55 51 4 -147 0 0 55 0 35 2 59 53 61 150 -3 54 23 48 55 37 34 54 3 18 55 58 22 -146 0 0 55 7 38 2 59 57 62 152 -3 54 30 56 55 44 33 54 10 28 56 5 19 -145 0 0 55 14 21 3 0 1 62 153 -4 54 37 42 55 51 11 54 17 16 56 11 54 -144 0 0 55 20 42 3 0 5 62 155 -5 54 44 7 55 57 28 54 23 44 56 18 9 -143 0 0 55 26 42 3 0 9 62 157 -5 54 50 11 56 3 24 54 29 49 56 24 3 -142 0 0 55 32 21 3 0 13 62 159 -6 54 55 54 56 9 0 54 35 34 56 29 37 -141 0 0 55 37 39 3 0 17 62 161 -6 55 1 15 56 14 15 54 40 57 56 34 50 -140 0 0 55 42 37 3 0 21 62 163 -7 55 6 16 56 19 10 54 46 0 56 39 43 -139 0 0 55 47 14 3 0 25 62 165 -7 55 10 56 56 23 44 54 50 42 56 44 15 -138 0 0 55 51 31 3 0 29 62 167 -8 55 15 16 56 27 58 54 55 3 56 48 28 -137 0 0 55 55 28 3 0 33 63 169 -9 55 19 15 56 31 52 54 59 3 56 52 21 -136 0 0 55 59 4 3 0 37 63 171 -9 55 22 54 56 35 26 55 2 43 56 55 53 -135 0 0 56 2 20 3 0 41 63 173 -10 55 26 12 56 38 40 55 6 3 56 59 6 -134 0 0 56 5 17 3 0 45 63 175 -10 55 29 10 56 41 35 55 9 2 57 1 59 -133 0 0 56 7 53 3 0 49 63 177 -11 55 31 48 56 44 9 55 11 41 57 4 33 -132 0 0 56 10 9 3 0 53 63 179 -11 55 34 6 56 46 24 55 13 59 57 6 47 -131 0 0 56 12 6 3 0 56 63 181 -12 55 36 4 56 48 19 55 15 58 57 8 42 -130 0 0 56 13 42 3 1 0 63 183 -13 55 37 41 56 49 55 55 17 36 57 10 17 -129 0 0 56 14 59 3 1 4 62 185 -13 55 38 59 56 51 11 55 18 54 57 11 32 -128 0 0 56 15 56 3 1 8 62 187 -14 55 39 57 56 52 7 55 19 52 57 12 28 -127 0 0 56 16 34 3 1 12 62 188 -14 55 40 35 56 52 44 55 20 30 57 13 5 -126 0 0 56 16 52 3 1 16 62 190 -15 55 40 53 56 53 2 55 20 48 57 13 23 -125 0 0 56 16 50 3 1 20 62 192 -15 55 40 51 56 53 0 55 20 46 57 13 21 -124 0 0 56 16 28 3 1 24 62 194 -16 55 40 29 56 52 39 55 20 24 57 13 0 -123 0 0 56 15 47 3 1 27 62 196 -17 55 39 47 56 51 58 55 19 42 57 12 19 -122 0 0 56 14 46 3 1 31 62 198 -17 55 38 45 56 50 58 55 18 40 57 11 19 -121 0 0 56 13 25 3 1 35 62 200 -18 55 37 24 56 49 38 55 17 18 57 10 0 -120 0 0 56 11 45 3 1 39 61 202 -18 55 35 42 56 47 59 55 15 36 57 8 21 -119 0 0 56 9 44 3 1 43 61 204 -19 55 33 41 56 46 0 55 13 34 57 6 23 -118 0 0 56 7 24 3 1 47 61 205 -19 55 31 19 56 43 41 55 11 11 57 4 5 -117 0 0 56 4 44 3 1 51 61 207 -20 55 28 37 56 41 3 55 8 29 57 1 28 -116 0 0 56 1 44 3 1 54 61 209 -20 55 25 35 56 38 5 55 5 26 56 58 31 -115 0 0 55 58 24 3 1 58 60 211 -21 55 22 13 56 34 47 55 2 2 56 55 14 -114 0 0 55 54 44 3 2 2 60 212 -22 55 18 31 56 31 9 54 58 18 56 51 38 -113 0 0 55 50 44 3 2 6 60 214 -22 55 14 28 56 27 11 54 54 14 56 47 42 -112 0 0 55 46 23 3 2 10 60 216 -23 55 10 4 56 22 54 54 49 49 56 43 26 -111 0 0 55 41 42 3 2 14 59 218 -23 55 5 20 56 18 15 54 45 4 56 38 49 -110 0 0 55 36 40 3 2 17 59 219 -24 55 0 16 56 13 17 54 39 57 56 33 53 -109 0 0 55 31 18 3 2 21 59 221 -25 54 54 50 56 7 58 54 34 30 56 28 36 -108 0 0 55 25 35 3 2 25 58 223 -25 54 49 4 56 2 19 54 28 41 56 22 59 -107 0 0 55 19 32 3 2 29 58 224 -26 54 42 56 55 56 19 54 22 32 56 17 1 -106 0 0 55 13 7 3 2 33 58 226 -26 54 36 27 55 49 59 54 16 1 56 10 43 -105 0 0 55 6 21 3 2 37 57 228 -27 54 29 37 55 43 17 54 9 8 56 4 3 -104 0 0 54 59 14 3 2 41 57 229 -27 54 22 26 55 36 14 54 1 54 55 57 3 -103 0 0 54 51 45 3 2 45 57 231 -28 54 14 52 55 28 50 53 54 19 55 49 42 -102 0 0 54 43 55 3 2 48 56 232 -29 54 6 57 55 21 5 53 46 21 55 41 59 -101 0 0 54 35 43 3 2 52 56 234 -29 53 58 40 55 12 58 53 38 1 55 33 55 -100 0 0 54 27 9 3 2 56 56 235 -30 53 50 1 55 4 29 53 29 19 55 25 29 - 99 0 0 54 18 13 3 3 0 55 237 -30 53 41 0 54 55 38 53 20 15 55 16 41 - 98 0 0 54 8 54 3 3 4 55 238 -31 53 31 36 54 46 25 53 10 48 55 7 31 - 97 0 0 53 59 13 3 3 8 54 240 -32 53 21 50 54 36 50 53 0 58 54 57 59 - 96 0 0 53 49 10 3 3 12 54 241 -32 53 11 40 54 26 52 52 50 46 54 48 5 - 95 0 0 53 38 43 3 3 16 53 242 -33 53 1 8 54 16 32 52 40 10 54 37 48 - 94 0 0 53 27 54 3 3 20 53 244 -34 52 50 12 54 5 48 52 29 11 54 27 8 - 93 0 0 53 16 41 3 3 23 52 245 -34 52 38 53 53 54 42 52 17 48 54 16 5 - 92 0 0 53 5 4 3 3 27 52 247 -35 52 27 10 53 43 12 52 6 2 54 4 39 - 91 0 0 52 53 4 3 3 31 52 248 -35 52 15 3 53 31 19 51 53 52 53 52 50 - 90 0 0 52 40 40 3 3 35 51 249 -36 52 2 33 53 19 1 51 41 17 53 40 36 - 89 0 0 52 27 52 3 3 39 51 251 -37 51 49 38 53 6 20 51 28 19 53 27 59 - 88 0 0 52 14 40 3 3 43 50 252 -37 51 36 18 52 53 15 51 14 55 53 14 58 - 87 0 0 52 1 3 3 3 47 49 253 -38 51 22 34 52 39 45 51 1 7 53 1 32 - 86 0 0 51 47 1 3 3 51 49 254 -39 51 8 25 52 25 51 50 46 54 52 47 42 - 85 0 0 51 32 34 3 3 55 48 256 -39 50 53 51 52 11 32 50 32 16 52 33 27 - 84 0 0 51 17 43 3 3 59 48 257 -40 50 38 52 51 56 48 50 17 13 52 18 47 - 83 0 0 51 2 25 3 4 3 47 258 -41 50 23 27 51 41 38 50 1 44 52 3 42 - 82 0 0 50 46 43 3 4 7 47 259 -41 50 7 37 51 26 3 49 45 49 51 48 11 - 81 0 0 50 30 34 3 4 11 46 261 -42 49 51 21 51 10 2 49 29 29 51 32 15 - 80 0 0 50 14 0 3 4 14 46 262 -43 49 34 39 50 53 36 49 12 43 51 15 53 - 79 0 0 49 56 59 3 4 18 45 263 -43 49 17 30 50 36 43 48 55 30 50 59 5 - 78 0 0 49 39 33 3 4 22 44 264 -44 48 59 56 50 19 25 48 37 51 50 41 51 - 77 0 0 49 21 39 3 4 26 44 265 -45 48 41 54 50 1 39 48 19 45 50 24 11 - 76 0 0 49 3 19 3 4 30 43 266 -46 48 23 27 49 43 28 48 1 13 50 6 3 - 75 0 0 48 44 33 3 4 34 42 267 -46 48 4 32 49 24 49 47 42 14 49 47 30 - 74 0 0 48 25 19 3 4 38 42 268 -47 47 45 10 49 5 44 47 22 48 49 28 29 - 73 0 0 48 5 39 3 4 42 41 269 -48 47 25 22 48 46 12 47 2 55 49 9 1 - 72 0 0 47 45 31 3 4 45 40 270 -48 47 5 6 48 26 12 46 42 35 48 49 7 - 71 0 0 47 24 57 3 4 49 40 271 -49 46 44 24 48 5 46 46 21 48 48 28 45 - 70 0 0 47 3 55 3 4 53 39 272 -50 46 23 14 47 44 52 46 0 34 48 7 55 - 69 0 0 46 42 26 3 4 57 38 273 -51 46 1 37 47 23 31 45 38 53 47 46 39 - 68 0 0 46 20 29 3 5 1 38 274 -51 45 39 33 47 1 42 45 16 44 47 24 55 - 67 0 0 45 58 5 3 5 4 37 275 -52 45 17 1 46 39 26 44 54 8 47 2 44 - 66 0 0 45 35 14 3 5 8 36 276 -53 44 54 2 46 16 43 44 31 5 46 40 5 - 65 0 0 45 11 56 3 5 12 35 277 -54 44 30 36 45 53 33 44 7 35 46 16 59 - 64 0 0 44 48 10 3 5 15 35 278 -54 44 6 43 45 29 55 43 43 38 45 53 25 - 63 0 0 44 23 58 3 5 19 34 279 -55 43 42 23 45 5 50 43 19 14 45 29 24 - 62 0 0 43 59 18 3 5 23 33 280 -56 43 17 37 44 41 18 42 54 23 45 4 56 - 61 0 0 43 34 12 3 5 26 32 281 -57 42 52 23 44 16 18 42 29 6 44 40 1 - 60 0 0 43 8 39 3 5 29 31 282 -57 42 26 44 43 50 53 42 3 23 44 14 40 - 59 0 0 42 42 40 3 5 33 31 283 -58 42 0 38 43 25 0 41 37 13 43 48 51 - 58 0 0 42 16 14 3 5 36 30 283 -59 41 34 6 42 58 42 41 10 37 43 22 36 - 57 0 0 41 49 23 3 5 40 29 284 -60 41 7 8 42 31 57 40 43 36 42 55 55 - 56 0 0 41 22 6 3 5 43 28 285 -60 40 39 45 42 4 46 40 16 10 42 28 48 - 55 0 0 40 54 25 3 5 46 27 286 -61 40 11 58 41 37 10 39 48 19 42 1 16 - 54 0 0 40 26 18 3 5 49 26 287 -62 39 43 45 41 9 10 39 20 4 41 33 18 - 53 0 0 39 57 47 3 5 52 25 287 -63 39 15 9 40 40 44 38 51 25 41 4 56 - 52 0 0 39 28 52 3 5 55 25 288 -63 38 46 9 40 11 55 38 22 22 40 36 9 - 51 0 0 38 59 34 3 5 58 24 289 -64 38 16 46 39 42 41 37 52 56 40 6 59 - 50 0 0 38 29 53 3 6 1 23 290 -65 37 47 1 39 13 5 37 23 9 39 37 25 - 49 0 0 37 59 50 3 6 4 22 290 -66 37 16 54 38 43 6 36 52 59 39 7 29 - 48 0 0 37 29 26 3 6 7 21 291 -66 36 46 25 38 12 46 36 22 28 38 37 11 - 47 0 0 36 58 40 3 6 9 20 292 -67 36 15 36 37 42 4 35 51 37 38 6 31 - 46 0 0 36 27 35 3 6 12 19 292 -67 35 44 27 37 11 2 35 20 27 37 35 31 - 45 0 0 35 56 10 3 6 14 18 293 -68 35 12 59 36 39 40 34 48 57 37 4 11 - 44 0 0 35 24 26 3 6 16 17 294 -69 34 41 13 36 7 59 34 17 9 36 32 31 - 43 0 0 34 52 25 3 6 18 16 294 -69 34 9 9 35 36 0 33 45 4 36 0 33 - 42 0 0 34 20 6 3 6 21 15 295 -70 33 36 49 35 3 43 33 12 43 35 28 18 - 41 0 0 33 47 32 3 6 22 14 295 -70 33 4 13 34 31 10 32 40 6 34 55 46 - 40 0 0 33 14 42 3 6 24 13 296 -71 32 31 22 33 58 22 32 7 15 34 22 58 - 39 0 0 32 41 38 3 6 26 12 297 -71 31 58 18 33 25 19 31 34 10 33 49 56 - 38 0 0 32 8 21 3 6 28 11 297 -71 31 25 0 32 52 3 31 0 52 33 16 40 - 37 0 0 31 34 52 3 6 29 10 298 -72 30 51 31 32 18 33 30 27 23 32 43 11 - 36 0 0 31 1 12 3 6 30 9 298 -72 30 17 51 31 44 53 29 53 43 32 9 30 - 35 0 0 30 27 21 3 6 32 8 299 -72 29 44 1 31 11 2 29 19 53 31 35 39 - 34 0 0 29 53 22 3 6 33 7 299 -72 29 10 3 30 37 1 28 45 55 31 1 38 - 33 0 0 29 19 14 3 6 34 6 300 -72 28 35 57 30 2 53 28 11 50 30 27 28 - 32 0 0 28 45 0 3 6 34 5 300 -72 28 1 44 29 28 37 27 37 39 29 53 11 - 31 0 0 28 10 40 3 6 35 4 301 -72 27 27 26 28 54 15 27 3 22 29 18 48 - 30 0 0 27 36 16 3 6 36 3 301 -72 26 53 4 28 19 48 26 29 1 28 44 20 - 29 0 0 27 1 48 3 6 36 2 302 -72 26 18 39 27 45 17 25 54 38 28 9 48 - 28 0 0 26 27 18 3 6 36 1 302 -71 25 44 12 27 10 44 25 20 12 27 35 13 Uncertainty in time = +/- 2 secs Prediction of 2010 Feb 4.0 Data for the target star ------------------------ * name: TYC 1811-01716-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 39 05.8218 DE: +28 49 36.113 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .020 ) * V mag [mag]: 11.1 * B mag [mag]: 12.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (81) Terpsichore approx. diameter [km]: 119 approx. diameter ["]: .083 distance from Earth [AU]: 1.98800 * orbital information: orbit source: Preston date of fit: 2010 Feb 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 880 number of rejected observations: 77 time covered by the observations: 1909 Jan 01 - 2010 Jan 27 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.013, 70° remarks: * orbital elements for (81) Terpsichore : Mean anomaly = 21.01901882 deg Arg. of pericenter = 51.27024903 deg Long. of node = 1.05187361 deg Inclination = 7.80329818 deg Eccentricity = 0.20699561 Semimajor axis = 2.85539347 AU Perihelion dist = 2.26433955 AU Mag: H = 8.50, G = 0.15 Epoch of elements : MJD 55238.12500000 TDT (2010 Feb 11.125) ------ occelmnt file for Occult BEGIN ----------------------------------- 2010 Feb 11 81 Terpsichore 3h 0.8m UT 11.1 3 39 5.822 28 49 36.11TYC 1811-01716-1 12.5 13.0 119 7.3 1.988 3.077 2.01 -131.4950 28.827 138.37 -14.09 3.0128 -0.02253 0.45415 9.13939 0.45340 0.00556 0.00121 2000 19.3593232010 2 3.00000 51.270249 1.051874 7.8032980.20699561 2.8553935 2.2643396 8.5 5.00.15 RATE 2.0427030 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.025 0.023 80 1.28 0.023 0 055231.0020100211_1716-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2010 Feb 03, 18:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org