IOTA/IOTA-ES occultation update for (1512) Oulu / TYC 0275-00523-1 event on 2009 Apr 10, 06:30 UT Visible from Summary ------- On 2009 Apr 10 UT, the 83 km diameter asteroid (1512) Oulu will occult a 11.9 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.3 mag to 15.1 mag (the magnitude of the asteroid) for at most 7.1 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: 68 * date and approx. time of event: 2009 Apr 10, 06:25 - 2009 Apr 10, 06:38 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 3.3 * estimated maximum duration [s]: 7.1 * Moon: 99 % sunlit, 35° distance * Sun: 154° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 115 * 1 sigma uncertainty interval [path widths]: +/- 0.87 * 1 sigma uncertainty interval [seconds]: +/- 8.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .047 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .049", .036", 111° ) * approx speed of asteroid's shadow [km/s]: 11.6303 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0275-00523-1 by 1512 Oulu on 2009 Apr 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 -176 0 0 57 5 20 6 38 6 22 120 0 57 36 56 56 34 1 58 32 37 55 40 9 -175 0 0 57 1 5 6 38 3 22 121 -1 57 32 42 56 29 44 58 28 25 55 35 50 -174 0 0 56 56 38 6 38 0 23 122 -1 57 28 17 56 25 16 58 24 3 55 31 20 -173 0 0 56 52 1 6 37 58 23 123 -2 57 23 41 56 20 37 58 19 30 55 26 38 -172 0 0 56 47 12 6 37 55 24 124 -3 57 18 54 56 15 47 58 14 46 55 21 46 -171 0 0 56 42 13 6 37 52 24 125 -3 57 13 57 56 10 47 58 9 51 55 16 42 -170 0 0 56 37 3 6 37 49 25 126 -4 57 8 48 56 5 35 58 4 45 55 11 28 -169 0 0 56 31 42 6 37 45 25 127 -4 57 3 29 56 0 12 57 59 29 55 6 3 -168 0 0 56 26 10 6 37 42 26 127 -5 56 57 59 55 54 39 57 54 2 55 0 27 -167 0 0 56 20 28 6 37 39 26 128 -5 56 52 18 55 48 55 57 48 24 54 54 40 -166 0 0 56 14 35 6 37 36 27 129 -6 56 46 26 55 43 0 57 42 36 54 48 42 -165 0 0 56 8 30 6 37 32 27 130 -6 56 40 24 55 36 54 57 36 36 54 42 33 -164 0 0 56 2 15 6 37 29 28 131 -7 56 34 11 55 30 37 57 30 27 54 36 14 -163 0 0 55 55 50 6 37 25 28 132 -7 56 27 47 55 24 10 57 24 6 54 29 43 -162 0 0 55 49 13 6 37 22 29 133 -8 56 21 12 55 17 32 57 17 35 54 23 2 -161 0 0 55 42 26 6 37 18 29 134 -8 56 14 27 55 10 43 57 10 53 54 16 10 -160 0 0 55 35 28 6 37 14 30 135 -9 56 7 31 55 3 43 57 4 0 54 9 8 -159 0 0 55 28 20 6 37 11 30 136 -10 56 0 24 54 56 33 56 56 57 54 1 54 -158 0 0 55 21 0 6 37 7 31 137 -10 55 53 7 54 49 12 56 49 43 53 54 30 -157 0 0 55 13 31 6 37 3 31 138 -11 55 45 39 54 41 40 56 42 18 53 46 55 -156 0 0 55 5 50 6 36 59 32 139 -11 55 38 0 54 33 58 56 34 43 53 39 10 -155 0 0 54 57 59 6 36 55 32 140 -12 55 30 11 54 26 5 56 26 57 53 31 14 -154 0 0 54 49 58 6 36 51 32 141 -12 55 22 12 54 18 1 56 19 1 53 23 7 -153 0 0 54 41 46 6 36 47 33 142 -13 55 14 1 54 9 47 56 10 54 53 14 50 -152 0 0 54 33 23 6 36 42 33 143 -13 55 5 41 54 1 23 56 2 37 53 6 23 -151 0 0 54 24 50 6 36 38 34 144 -14 54 57 10 53 52 48 55 54 10 52 57 45 -150 0 0 54 16 7 6 36 33 34 145 -15 54 48 29 53 44 3 55 45 32 52 48 57 -149 0 0 54 7 13 6 36 29 35 146 -15 54 39 37 53 35 8 55 36 44 52 39 59 -148 0 0 53 58 10 6 36 24 35 148 -16 54 30 35 53 26 2 55 27 45 52 30 50 -147 0 0 53 48 56 6 36 20 36 149 -16 54 21 23 53 16 47 55 18 36 52 21 31 -146 0 0 53 39 32 6 36 15 36 150 -17 54 12 1 53 7 21 55 9 17 52 12 2 -145 0 0 53 29 57 6 36 10 36 151 -17 54 2 28 52 57 45 54 59 48 52 2 23 -144 0 0 53 20 13 6 36 6 37 152 -18 53 52 46 52 47 59 54 50 9 51 52 35 -143 0 0 53 10 19 6 36 1 37 153 -18 53 42 54 52 38 3 54 40 20 51 42 36 -142 0 0 53 0 15 6 35 56 38 154 -19 53 32 52 52 27 57 54 30 21 51 32 27 -141 0 0 52 50 2 6 35 51 38 155 -19 53 22 40 52 17 42 54 20 13 51 22 9 -140 0 0 52 39 38 6 35 46 38 157 -20 53 12 18 52 7 17 54 9 54 51 11 42 -139 0 0 52 29 6 6 35 40 39 158 -20 53 1 47 51 56 43 53 59 26 51 1 5 -138 0 0 52 18 23 6 35 35 39 159 -21 52 51 6 51 45 59 53 48 48 50 50 18 -137 0 0 52 7 32 6 35 30 40 160 -22 52 40 16 51 35 6 53 38 1 50 39 22 -136 0 0 51 56 31 6 35 24 40 161 -22 52 29 17 51 24 3 53 27 4 50 28 17 -135 0 0 51 45 20 6 35 19 40 162 -23 52 18 8 51 12 52 53 15 59 50 17 3 -134 0 0 51 34 1 6 35 14 41 164 -23 52 6 50 51 1 31 53 4 44 50 5 40 -133 0 0 51 22 33 6 35 8 41 165 -24 51 55 24 50 50 2 52 53 20 49 54 9 -132 0 0 51 10 57 6 35 2 41 166 -24 51 43 48 50 38 24 52 41 47 49 42 28 -131 0 0 50 59 11 6 34 57 42 167 -25 51 32 4 50 26 37 52 30 5 49 30 39 -130 0 0 50 47 17 6 34 51 42 169 -25 51 20 12 50 14 42 52 18 15 49 18 42 -129 0 0 50 35 15 6 34 45 42 170 -26 51 8 11 50 2 38 52 6 16 49 6 37 -128 0 0 50 23 4 6 34 39 43 171 -26 50 56 1 49 50 27 51 54 9 48 54 23 -127 0 0 50 10 46 6 34 33 43 173 -27 50 43 44 49 38 7 51 41 53 48 42 2 -126 0 0 49 58 20 6 34 27 43 174 -27 50 31 19 49 25 40 51 29 30 48 29 32 -125 0 0 49 45 45 6 34 21 44 175 -28 50 18 45 49 13 4 51 16 59 48 16 56 -124 0 0 49 33 4 6 34 15 44 176 -28 50 6 5 49 0 22 51 4 20 48 4 12 -123 0 0 49 20 15 6 34 9 44 178 -29 49 53 17 48 47 32 50 51 33 47 51 20 -122 0 0 49 7 18 6 34 3 44 179 -29 49 40 21 48 34 35 50 38 39 47 38 22 -121 0 0 48 54 15 6 33 56 44 181 -30 49 27 19 48 21 31 50 25 38 47 25 17 -120 0 0 48 41 5 6 33 50 45 182 -30 49 14 9 48 8 20 50 12 30 47 12 5 -119 0 0 48 27 49 6 33 44 45 183 -31 49 0 53 47 55 3 49 59 15 46 58 47 -118 0 0 48 14 26 6 33 37 45 185 -31 48 47 31 47 41 39 49 45 54 46 45 22 -117 0 0 48 0 56 6 33 31 45 186 -32 48 34 2 47 28 10 49 32 26 46 31 52 -116 0 0 47 47 21 6 33 24 45 188 -32 48 20 28 47 14 34 49 18 52 46 18 15 -115 0 0 47 33 40 6 33 17 46 189 -33 48 6 47 47 0 53 49 5 12 46 4 34 -114 0 0 47 19 54 6 33 11 46 190 -33 47 53 1 46 47 6 48 51 27 45 50 46 -113 0 0 47 6 2 6 33 4 46 192 -33 47 39 10 46 33 14 48 37 36 45 36 54 -112 0 0 46 52 6 6 32 57 46 193 -34 47 25 13 46 19 18 48 23 40 45 22 57 -111 0 0 46 38 4 6 32 51 46 195 -34 47 11 12 46 5 16 48 9 39 45 8 55 -110 0 0 46 23 58 6 32 44 46 196 -35 46 57 6 45 51 10 47 55 33 44 54 49 -109 0 0 46 9 48 6 32 37 46 198 -35 46 42 55 45 37 0 47 41 22 44 40 39 -108 0 0 45 55 34 6 32 30 46 199 -35 46 28 41 45 22 46 47 27 8 44 26 25 -107 0 0 45 41 16 6 32 23 46 200 -36 46 14 23 45 8 28 47 12 49 44 12 7 -106 0 0 45 26 54 6 32 16 46 202 -36 46 0 1 44 54 6 46 58 27 43 57 46 -105 0 0 45 12 29 6 32 10 46 203 -36 45 45 36 44 39 42 46 44 1 43 43 22 -104 0 0 44 58 1 6 32 3 46 205 -37 45 31 8 44 25 14 46 29 32 43 28 56 -103 0 0 44 43 31 6 31 56 46 206 -37 45 16 37 44 10 44 46 15 1 43 14 26 -102 0 0 44 28 58 6 31 49 46 208 -37 45 2 4 43 56 12 46 0 26 42 59 55 -101 0 0 44 14 23 6 31 42 46 209 -38 44 47 28 43 41 38 45 45 50 42 45 22 -100 0 0 43 59 47 6 31 35 45 210 -38 44 32 51 43 27 2 45 31 11 42 30 47 - 99 0 0 43 45 9 6 31 28 45 212 -38 44 18 12 43 12 24 45 16 31 42 16 10 - 98 0 0 43 30 29 6 31 21 45 213 -39 44 3 32 42 57 46 45 1 50 42 1 33 - 97 0 0 43 15 49 6 31 14 45 215 -39 43 48 51 42 43 6 44 47 7 41 46 55 - 96 0 0 43 1 8 6 31 6 45 216 -39 43 34 9 42 28 26 44 32 24 41 32 16 - 95 0 0 42 46 27 6 30 59 44 217 -39 43 19 27 42 13 46 44 17 40 41 17 37 - 94 0 0 42 31 46 6 30 52 44 219 -39 43 4 45 41 59 6 44 2 56 41 2 59 - 93 0 0 42 17 5 6 30 45 44 220 -40 42 50 3 41 44 26 43 48 12 40 48 21 - 92 0 0 42 2 25 6 30 38 44 221 -40 42 35 22 41 29 47 43 33 29 40 33 44 - 91 0 0 41 47 46 6 30 31 43 223 -40 42 20 41 41 15 9 43 18 47 40 19 7 - 90 0 0 41 33 8 6 30 24 43 224 -40 42 6 2 41 0 32 43 4 5 40 4 33 - 89 0 0 41 18 31 6 30 17 43 225 -40 41 51 25 40 45 57 42 49 25 39 50 0 - 88 0 0 41 3 57 6 30 11 42 227 -40 41 36 49 40 31 24 42 34 47 39 35 29 - 87 0 0 40 49 25 6 30 4 42 228 -40 41 22 16 40 16 53 42 20 11 39 21 0 - 86 0 0 40 34 55 6 29 57 42 229 -40 41 7 45 40 2 25 42 5 38 39 6 34 - 85 0 0 40 20 29 6 29 50 41 230 -40 40 53 16 39 48 0 41 51 7 38 52 11 - 84 0 0 40 6 5 6 29 43 41 231 -40 40 38 51 39 33 38 41 36 40 38 37 51 - 83 0 0 39 51 45 6 29 36 40 233 -40 40 24 30 39 19 19 41 22 15 38 23 35 - 82 0 0 39 37 29 6 29 30 40 234 -40 40 10 12 39 5 5 41 7 55 38 9 23 - 81 0 0 39 23 17 6 29 23 39 235 -40 39 55 59 38 50 54 40 53 39 37 55 15 - 80 0 0 39 9 10 6 29 16 39 236 -40 39 41 50 38 36 48 40 39 27 37 41 12 - 79 0 0 38 55 7 6 29 10 38 237 -40 39 27 46 38 22 47 40 25 20 37 27 14 - 78 0 0 38 41 10 6 29 3 38 238 -40 39 13 47 38 8 52 40 11 18 37 13 21 - 77 0 0 38 27 18 6 28 57 37 239 -40 38 59 53 37 55 1 39 57 21 36 59 33 - 76 0 0 38 13 32 6 28 50 37 240 -40 38 46 5 37 41 17 39 43 30 36 45 52 - 75 0 0 37 59 52 6 28 44 36 241 -40 38 32 24 37 27 39 39 29 45 36 32 16 - 74 0 0 37 46 18 6 28 38 36 242 -40 38 18 48 37 14 7 39 16 7 36 18 47 - 73 0 0 37 32 52 6 28 31 35 243 -39 38 5 20 37 0 42 39 2 35 36 5 25 - 72 0 0 37 19 32 6 28 25 35 244 -39 37 51 58 36 47 24 38 49 10 35 52 10 - 71 0 0 37 6 19 6 28 19 34 245 -39 37 38 44 36 34 13 38 35 53 35 39 2 - 70 0 0 36 53 15 6 28 13 33 246 -39 37 25 37 36 21 10 38 22 43 35 26 2 - 69 0 0 36 40 18 6 28 7 33 247 -38 37 12 39 36 8 15 38 9 41 35 13 10 - 68 0 0 36 27 30 6 28 2 32 248 -38 36 59 49 35 55 28 37 56 47 35 0 26 - 67 0 0 36 14 50 6 27 56 31 249 -38 36 47 7 35 42 50 37 44 3 34 47 51 - 66 0 0 36 2 19 6 27 50 31 250 -37 36 34 34 35 30 21 37 31 26 34 35 25 - 65 0 0 35 49 57 6 27 45 30 251 -37 36 22 11 35 18 1 37 19 0 34 23 8 - 64 0 0 35 37 45 6 27 39 29 251 -37 36 9 57 35 5 51 37 6 42 34 11 0 - 63 0 0 35 25 42 6 27 34 29 252 -36 35 57 52 34 53 50 36 54 35 33 59 3 - 62 0 0 35 13 50 6 27 29 28 253 -36 35 45 58 34 41 59 36 42 37 33 47 15 - 61 0 0 35 2 8 6 27 24 27 254 -36 35 34 14 34 30 19 36 30 50 33 35 37 - 60 0 0 34 50 37 6 27 19 27 255 -35 35 22 41 34 18 49 36 19 14 33 24 11 - 59 0 0 34 39 16 6 27 14 26 255 -35 35 11 19 34 7 31 36 7 48 33 12 55 - 58 0 0 34 28 7 6 27 9 25 256 -34 35 0 8 33 56 23 35 56 34 33 1 50 - 57 0 0 34 17 9 6 27 5 24 257 -34 34 49 8 33 45 27 35 45 31 32 50 57 - 56 0 0 34 6 23 6 27 0 24 257 -33 34 38 20 33 34 42 35 34 40 32 40 15 - 55 0 0 33 55 49 6 26 56 23 258 -33 34 27 45 33 24 10 35 24 2 32 29 45 - 54 0 0 33 45 27 6 26 52 22 259 -32 34 17 21 33 13 49 35 13 35 32 19 28 - 53 0 0 33 35 17 6 26 48 21 259 -32 34 7 10 33 3 42 35 3 21 32 9 22 - 52 0 0 33 25 20 6 26 44 20 260 -31 33 57 12 32 53 46 34 53 20 31 59 30 - 51 0 0 33 15 37 6 26 40 20 261 -30 33 47 26 32 44 4 34 43 31 31 49 50 - 50 0 0 33 6 6 6 26 36 19 261 -30 33 37 54 32 34 35 34 33 57 31 40 24 - 49 0 0 32 56 49 6 26 32 18 262 -29 33 28 36 32 25 20 34 24 35 31 31 11 - 48 0 0 32 47 46 6 26 29 17 263 -29 33 19 31 32 16 18 34 15 28 31 22 11 - 47 0 0 32 38 57 6 26 26 16 263 -28 33 10 40 32 7 30 34 6 34 31 13 26 - 46 0 0 32 30 21 6 26 23 16 264 -27 33 2 3 31 58 56 33 57 55 31 4 54 - 45 0 0 32 22 0 6 26 20 15 264 -27 32 53 41 31 50 36 33 49 30 30 56 37 - 44 0 0 32 13 54 6 26 17 14 265 -26 32 45 33 31 42 31 33 41 20 30 48 34 - 43 0 0 32 6 2 6 26 14 13 266 -25 32 37 41 31 34 41 33 33 25 30 40 46 - 42 0 0 31 58 26 6 26 12 12 266 -25 32 30 3 31 27 6 33 25 45 30 33 12 - 41 0 0 31 51 4 6 26 9 12 267 -24 32 22 40 31 19 46 33 18 20 30 25 54 - 40 0 0 31 43 58 6 26 7 11 267 -23 32 15 33 31 12 41 33 11 11 30 18 51 - 39 0 0 31 37 8 6 26 5 10 268 -23 32 8 41 31 5 51 33 4 17 30 12 4 - 38 0 0 31 30 33 6 26 3 9 268 -22 32 2 6 30 59 18 32 57 40 30 5 32 - 37 0 0 31 24 14 6 26 2 8 269 -21 31 55 46 30 53 0 32 51 18 29 59 15 - 36 0 0 31 18 12 6 26 0 7 269 -20 31 49 42 30 46 58 32 45 13 29 53 15 - 35 0 0 31 12 25 6 25 59 6 270 -20 31 43 55 30 41 12 32 39 23 29 47 31 - 34 0 0 31 6 55 6 25 57 6 270 -19 31 38 24 30 35 43 32 33 51 29 42 3 - 33 0 0 31 1 42 6 25 56 5 271 -18 31 33 9 30 30 30 32 28 35 .. .. .. - 32 0 0 30 56 45 6 25 56 4 272 -17 31 28 12 30 25 34 32 23 36 .. .. .. - 31 0 0 30 52 5 6 25 55 3 272 -17 31 23 31 30 20 55 32 18 54 .. .. .. - 30 0 0 30 47 42 6 25 54 2 273 -16 31 19 8 30 16 33 32 14 30 .. .. .. - 29 0 0 30 43 36 6 25 54 1 273 -15 31 15 1 30 12 27 32 10 22 .. .. .. - 28 0 0 30 39 48 6 25 54 0 274 -14 31 11 12 30 8 39 32 6 32 .. .. .. Uncertainty in time = +/- 8 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 0275-00523-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 11 42 21.1709 DE: +03 22 13.190 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .029 ) * V mag [mag]: 11.9 * B mag [mag]: 12.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1512) Oulu approx. diameter [km]: 83 approx. diameter ["]: .042 distance from Earth [AU]: 2.73200 * orbital information: orbit source: Preston date of fit: 2008 Mar 19 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 965 number of rejected observations: 36 time covered by the observations: 1939 Mar 18 - 2008 Feb 13 1 sigma uncertainty ellipse (major, minor, PA): 0.041, 0.023, 120° remarks: * orbital elements for (1512) Oulu : Mean anomaly = 306.34282362 deg Arg. of pericenter = 240.43217103 deg Long. of node = 10.28297005 deg Inclination = 6.49587359 deg Eccentricity = 0.15249353 Semimajor axis = 3.94875492 AU Perihelion dist = 3.34659534 AU Mag: H = 9.50, G = 0.15 Epoch of elements : MJD 54931.27100000 TDT (2009 Apr 10.271) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 10 1512 Oulu 6h 32.5m UT 11.9 11 42 21.171 3 22 13.19TYC 0275-00523-1 12.4 15.1 83 7.1 2.732 -1.372 4.88 -121.1599 3.370 82.22 8.02 6.5414 0.15939 0.67389 -6.38691 1.51650 0.00228 -0.00112 2000 306.1831782009 4 9.00000240.432171 10.282970 6.4958740.15249353 3.9487549 3.3465953 9.6 5.00.15 RATE 1.2560690 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.049 0.036 111 1.87 0.037 0 54545.5020090410_0523-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 06:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org