IOTA/IOTA-ES occultation update for (41) Daphne / TYC 0308-00173-1 event on 2008 Apr 01, 18:08 UT Visible from E Russia, Japan, S Pacific Islands Summary ------- On 2008 Apr 01 UT, the 210 km diameter asteroid (41) Daphne will occult a 12.0 mag star in the constellation Virgo for observers along a path across E Russia, Japan, S Pacific Islands. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.1 mag to 9.4 mag (the magnitude of the asteroid) for at most 22.1 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: 100 * date and approx. time of event: 2008 Apr 01, 18:00 - 2008 Apr 01, 18:17 UT * magnitude of target star: 12.0 * magnitude drop [mag]: 0.1 * estimated maximum duration [s]: 22.1 * Moon: 23 % sunlit, 111° distance * Sun: 165° distance * rough path description: E Russia, Japan, S Pacific Islands Additional comments ------------------- very low mag drop The occultation path -------------------- * approximate projected width [km]: 268 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .044 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .045", .026", 93° ) * approx speed of asteroid's shadow [km/s]: 9.5024 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0308-00173-1 by 41 Daphne on 2008 Apr 1 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 178 49 0 -26 43 10 18 0 23 14 278 -4 176 10 14 -27 5 53 -178 1 16 -26 20 54 175 23 48 -27 13 14 -176 49 57 -26 13 55 175 17 47 -25 29 14 18 0 37 17 279 -7 173 2 46 -25 52 0 177 49 34 -25 6 46 172 22 15 -25 59 20 178 42 59 -24 59 39 172 25 35 -24 16 29 18 0 50 20 280 -10 170 24 54 -24 39 11 174 37 22 -23 53 59 169 48 11 -24 46 30 175 22 30 -23 46 50 169 58 22 -23 4 40 18 1 4 22 281 -12 168 7 28 -23 27 18 171 57 27 -22 42 13 167 33 26 -23 34 34 172 37 39 -22 35 5 167 48 59 -21 53 41 18 1 17 25 281 -14 166 5 15 -22 16 12 169 39 8 -21 31 19 165 33 12 -22 23 26 170 15 59 -21 24 11 165 53 9 -20 43 25 18 1 31 27 282 -15 164 14 54 -21 5 49 167 36 39 -20 21 8 163 44 26 -21 13 1 168 11 3 -20 14 3 164 8 4 -19 33 48 18 1 44 28 282 -17 162 34 11 -19 56 5 165 46 22 -19 11 37 162 4 59 -20 3 15 166 18 54 -19 4 33 162 31 46 -18 24 46 18 1 58 30 282 -19 161 1 28 -18 46 57 164 5 55 -18 2 42 160 33 17 -18 54 4 164 36 58 -17 55 39 161 2 50 -17 16 16 18 2 11 32 282 -20 159 35 30 -17 38 21 162 33 34 -16 54 18 159 8 11 -17 45 26 163 3 24 -16 47 17 159 40 11 -16 8 16 18 2 25 33 282 -21 158 15 20 -16 30 15 161 8 3 -15 46 23 157 48 46 -16 37 18 161 36 53 -15 39 23 158 22 57 -15 0 42 18 2 38 34 281 -22 157 0 15 -15 22 35 159 48 24 -14 38 54 156 34 19 -15 29 36 160 16 24 -14 31 56 157 10 28 -13 53 33 18 2 52 36 281 -24 155 49 37 -14 15 20 158 33 51 -13 31 49 155 24 14 -14 22 20 159 1 7 -13 24 53 156 2 10 -12 46 45 18 3 5 37 281 -25 154 42 56 -13 8 28 157 23 46 -12 25 6 154 18 2 -13 15 26 157 50 25 -12 18 12 154 57 38 -11 40 18 18 3 19 38 280 -26 153 39 47 -12 1 56 156 17 40 -11 18 43 153 15 18 -12 8 53 156 43 47 -11 11 50 153 56 27 -10 34 9 18 3 32 39 280 -27 152 39 51 -10 55 43 155 15 8 -10 12 38 152 15 44 -11 2 38 155 40 47 -10 5 45 152 58 19 - 9 28 16 18 3 46 40 279 -27 151 42 47 - 9 49 47 154 15 48 - 9 6 48 151 19 0 - 9 56 41 154 41 2 - 8 59 57 152 2 57 - 8 22 37 18 3 59 41 278 -28 150 48 22 - 8 44 5 153 19 22 - 8 1 13 150 24 53 - 8 50 58 153 44 15 - 7 54 22 151 10 6 - 7 17 12 18 4 13 42 278 -29 149 56 23 - 7 38 37 152 25 36 - 6 55 50 149 33 8 - 7 45 29 152 50 10 - 6 49 0 150 19 34 - 6 11 58 18 4 26 43 277 -30 149 6 36 - 6 33 21 151 34 15 - 5 50 38 148 43 35 - 6 40 12 151 58 33 - 5 43 49 149 31 12 - 5 6 54 18 4 40 44 276 -30 148 18 53 - 5 28 15 150 45 10 - 4 45 35 147 56 4 - 5 35 5 151 9 12 - 4 38 46 148 44 48 - 4 1 58 18 4 53 45 275 -31 147 33 4 - 4 23 17 149 58 8 - 3 40 40 147 10 25 - 4 30 7 150 21 58 - 3 33 52 148 0 15 - 2 57 9 18 5 7 46 274 -32 146 49 1 - 3 18 27 149 13 2 - 2 35 52 146 26 32 - 3 25 17 149 36 41 - 2 29 4 147 17 26 - 1 52 25 18 5 20 46 273 -32 146 6 38 - 2 13 43 148 29 44 - 1 31 9 145 44 16 - 2 20 32 148 53 13 - 1 24 21 146 36 13 - 0 47 45 18 5 34 47 272 -33 145 25 47 - 1 9 2 147 48 7 - 0 26 29 145 3 33 - 1 15 52 148 11 28 - 0 19 41 145 56 31 0 16 53 18 5 47 48 271 -33 144 46 25 - 0 4 25 147 8 5 0 38 9 144 24 16 - 0 11 14 147 31 18 0 44 57 145 18 15 1 21 29 18 6 1 48 269 -34 144 8 24 1 0 11 146 29 31 1 42 46 143 46 20 0 53 21 146 52 39 1 49 34 144 41 20 2 26 5 18 6 14 49 268 -34 143 31 42 2 4 46 145 52 23 2 47 24 143 9 41 1 57 57 146 15 26 2 54 12 144 5 42 3 30 44 18 6 28 49 267 -35 142 56 13 3 9 23 145 16 34 3 52 3 142 34 16 3 2 33 145 39 33 3 58 53 143 31 16 4 35 25 18 6 42 50 266 -35 142 21 55 4 14 2 144 42 1 4 56 46 141 59 59 4 7 12 145 4 58 5 3 36 142 58 1 5 40 10 18 6 55 50 264 -35 141 48 43 5 18 46 144 8 41 6 1 34 141 26 49 5 11 54 144 31 37 6 8 25 142 25 52 6 45 2 18 7 9 50 263 -36 141 16 36 6 23 34 143 36 31 7 6 28 140 54 42 6 16 42 143 59 26 7 13 20 141 54 48 7 50 0 18 7 22 51 261 -36 140 45 30 7 28 30 143 5 28 8 11 30 140 23 36 7 21 37 143 28 23 8 18 23 141 24 45 8 55 7 18 7 36 51 260 -36 140 15 23 8 33 33 142 35 29 9 16 41 139 53 27 8 26 39 142 58 25 9 23 35 140 55 41 10 0 25 18 7 49 51 258 -36 139 46 13 9 38 47 142 6 32 10 22 3 139 24 15 9 31 51 142 29 31 10 28 58 140 27 36 11 5 54 18 8 3 51 257 -36 139 17 58 10 44 11 141 38 36 11 27 36 138 55 57 10 37 14 142 1 38 11 34 33 140 0 26 12 11 36 18 8 16 52 255 -36 138 50 36 11 49 48 141 11 39 12 33 24 138 28 32 11 42 50 141 34 45 12 40 22 139 34 11 13 17 33 18 8 30 52 254 -36 138 24 7 12 55 40 140 45 39 13 39 26 138 1 58 12 48 39 141 8 50 13 46 27 139 8 50 14 23 46 18 8 43 52 252 -36 137 58 28 14 1 47 140 20 36 14 45 46 137 36 15 13 54 45 140 43 53 14 52 48 138 44 21 15 30 17 18 8 57 52 251 -36 137 33 40 15 8 11 139 56 29 15 52 24 137 11 20 15 1 7 140 19 53 15 59 29 138 20 45 16 37 8 18 9 10 52 249 -36 137 9 41 16 14 55 139 33 17 16 59 23 136 47 14 16 7 49 139 56 49 17 6 30 137 58 0 17 44 21 18 9 24 51 248 -36 136 46 30 17 22 1 139 10 59 18 6 43 136 23 55 17 14 52 139 34 40 18 13 53 137 36 7 18 51 58 18 9 37 51 246 -36 136 24 8 18 29 29 138 49 37 19 14 29 136 1 24 18 22 17 139 13 28 19 21 41 137 15 5 20 0 0 18 9 51 51 245 -36 136 2 34 19 37 22 138 29 9 20 22 40 135 39 40 19 30 7 138 53 11 20 29 55 136 54 55 21 8 30 18 10 4 51 243 -36 135 41 48 20 45 42 138 9 36 21 31 20 135 18 43 20 38 24 138 33 52 21 38 39 136 35 37 22 17 29 18 10 18 50 242 -36 135 21 51 21 54 31 137 51 0 22 40 30 134 58 34 21 47 10 138 15 29 22 47 53 136 17 12 23 27 1 18 10 31 50 240 -35 135 2 43 23 3 52 137 33 21 23 50 14 134 39 12 22 56 27 137 58 6 23 57 40 135 59 41 24 37 8 18 10 45 50 239 -35 134 44 25 24 13 46 137 16 41 25 0 33 134 20 40 24 6 18 137 41 42 25 8 3 135 43 6 25 47 53 18 10 58 49 238 -35 134 26 58 25 24 18 137 1 1 26 11 31 134 2 58 25 16 46 137 26 20 26 19 5 135 27 29 26 59 18 18 11 12 49 236 -34 134 10 24 26 35 29 136 46 24 27 23 10 133 46 6 26 27 52 137 12 4 27 30 49 135 12 52 28 11 26 18 11 25 48 235 -34 133 54 45 27 47 22 136 32 52 28 35 34 133 30 8 27 39 40 136 58 54 28 43 18 134 59 17 29 24 21 18 11 39 48 234 -33 133 40 3 29 0 1 136 20 30 29 48 45 133 15 6 28 52 14 136 46 56 29 56 35 134 46 48 30 38 7 18 11 52 47 232 -33 133 26 21 30 13 29 136 9 20 31 2 49 133 1 1 30 5 37 136 36 12 31 10 44 134 35 30 31 52 46 18 12 6 46 231 -32 133 13 42 31 27 50 135 59 28 32 17 48 132 47 57 31 19 52 136 26 49 32 25 49 134 25 26 33 8 25 18 12 19 46 230 -32 133 2 10 32 43 8 135 50 59 33 33 47 132 35 58 32 35 4 136 18 52 33 41 55 134 16 43 34 25 7 18 12 33 45 229 -31 132 51 50 33 59 28 135 44 0 34 50 51 132 25 9 33 51 17 136 12 28 34 59 6 134 9 27 35 42 56 18 12 46 44 228 -31 132 42 48 35 16 55 135 38 39 36 9 5 132 15 35 35 8 36 136 7 47 36 17 28 134 3 48 37 2 0 18 13 0 43 227 -30 132 35 11 36 35 33 135 35 6 37 28 35 132 7 22 36 27 7 136 4 57 37 37 6 133 59 53 38 22 25 18 13 13 42 226 -29 132 29 8 37 55 30 135 33 33 38 49 27 132 0 39 37 46 55 136 4 11 38 58 8 133 57 56 39 44 16 18 13 27 41 225 -28 132 24 47 39 16 52 135 34 13 40 11 49 131 55 35 39 8 7 136 5 43 40 20 40 133 58 11 41 7 43 18 13 40 40 225 -28 132 22 21 40 39 46 135 37 22 41 35 50 131 52 21 40 30 51 136 9 53 41 44 51 134 0 54 42 32 54 18 13 54 39 224 -27 132 22 5 42 4 22 135 43 23 43 1 37 131 51 10 41 55 16 136 17 1 43 10 51 134 6 29 44 0 0 18 14 7 38 223 -26 132 24 17 43 30 48 135 52 41 44 29 23 131 52 22 43 21 30 136 27 35 44 38 50 134 15 21 45 29 11 18 14 21 37 223 -25 132 29 19 44 59 16 136 5 48 45 59 19 131 56 15 44 49 45 136 42 10 46 9 0 134 28 4 47 0 43 18 14 34 36 222 -24 132 37 40 46 30 0 136 23 24 47 31 40 132 3 17 46 20 13 137 1 27 47 41 37 134 45 22 48 34 49 18 14 48 34 222 -22 132 49 54 48 3 13 136 46 23 49 6 41 132 14 1 47 53 10 137 26 24 49 16 56 135 8 11 50 11 50 18 15 1 33 222 -21 133 6 48 49 39 14 137 15 53 50 44 43 132 29 11 49 28 52 137 58 13 50 55 19 135 37 45 51 52 7 18 15 15 31 221 -20 133 29 23 51 18 24 137 53 26 52 26 10 132 49 42 51 7 41 138 38 34 52 37 8 136 15 45 53 36 7 18 15 28 30 222 -19 133 58 58 53 1 8 138 41 8 54 11 30 133 16 50 52 50 1 139 29 42 54 22 54 137 4 31 55 24 24 18 15 42 28 222 -17 134 37 26 54 47 57 139 41 57 56 1 19 133 52 18 54 36 23 140 34 50 56 13 14 138 7 24 57 17 40 18 15 55 26 222 -15 135 27 23 56 39 30 141 0 16 57 56 22 134 38 32 56 27 24 141 58 43 58 8 52 139 29 28 59 16 49 18 16 9 24 223 -14 136 32 39 58 36 37 142 42 46 59 57 38 135 39 3 58 23 54 143 48 44 60 10 49 141 18 42 61 23 0 18 16 22 22 224 -12 137 59 12 60 40 23 145 0 28 62 6 23 136 59 17 60 26 55 146 17 10 62 20 25 143 48 40 63 37 52 18 16 36 20 226 -10 139 56 44 62 52 16 148 13 2 64 24 23 138 48 0 62 37 52 149 46 21 64 39 27 147 24 56 66 3 39 18 16 49 17 229 -7 142 42 30 65 14 17 153 0 34 66 54 7 141 20 32 64 58 44 155 3 29 67 10 29 153 3 59 68 43 43 18 17 3 13 235 -4 146 51 12 67 49 30 161 6 42 69 39 7 145 7 3 67 32 26 164 20 14 69 56 56 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: TYC 0308-00173-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 13 41 37.8468 DE: +00 42 22.188 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .037, .022 ) * V mag [mag]: 12.0 * B mag [mag]: 12.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (41) Daphne approx. diameter [km]: 210 approx. diameter ["]: .269 distance from Earth [AU]: 1.07600 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 994 number of rejected observations: 162 time covered by the observations: 1915 Jan 08 - 2008 Mar 25 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.013, 98° remarks: * orbital elements for (41) Daphne : Mean anomaly = 345.56661193 deg Arg. of pericenter = 46.31650083 deg Long. of node = 178.14780886 deg Inclination = 15.76673242 deg Eccentricity = 0.27177633 Semimajor axis = 2.76434709 AU Perihelion dist = 2.01306298 AU Mag: H = 7.22, G = 0.10 Epoch of elements : MJD 54557.75600000 TDT (2008 Apr 01.756) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 1 41 Daphne 18h 8.7m UT 12.0 13 41 37.847 0 42 22.19TYC 0308-00173-1 12.6 9.4 210 22.1 1.076 -1.121 40.51 102.7572 0.695 -91.25 4.90 18.1453 0.57323 0.23799 -2.05566 4.95382 -0.00133 -0.00051 2000 343.9033792008 325.00000 46.316501178.147809 15.7667320.27177633 2.7643471 2.0130630 7.1 5.00.10 RATE 2.1444470 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.045 0.026 93 1.16 0.042 0 54553.5020080401_0173-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org