IOTA/IOTA-ES occultation update for (1766) Slipher / TYC 1264-00559-1 event on 2008 Oct 13, 17:49 UT Visible from Australia Summary ------- On 2008 Oct 13 UT, the 24 km diameter asteroid (1766) Slipher will occult a 10.1 mag star in the constellation Taurus for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.8 mag to 15.9 mag (the magnitude of the asteroid) for at most 5.3 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: 28 * date and approx. time of event: 2008 Oct 13, 17:40 - 2008 Oct 13, 18:09 UT * midpoint of event [JD]: 2454753.243025 * magnitude of target star: 10.1 * magnitude drop [mag]: 5.8 * estimated maximum duration [s]: 5.3 * Moon: 98 % sunlit, 59° distance * Sun: 135° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 29 * 1 sigma uncertainty interval [path widths]: +/- 2.38 * 1 sigma uncertainty interval [seconds]: +/- 13.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .054 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .055", .038", 84° ) * approx speed of asteroid's shadow [km/s]: 4.5203 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1264-00559-1 by 1766 Slipher on 2008 Oct 13 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 100 28 37 -71 0 0 18 9 2 1 28 -10 100 0 32 100 56 40 ... .. .. 103 9 31 102 2 27 -70 0 0 18 9 2 2 26 -11 101 35 50 102 29 1 ... .. .. 104 35 1 103 29 44 -69 0 0 18 9 1 3 25 -12 103 4 26 103 55 1 ... .. .. 105 54 57 104 51 31 -68 0 0 18 8 59 4 24 -13 104 27 22 105 15 38 102 32 7 107 10 9 106 8 35 -67 0 0 18 8 56 5 22 -13 105 45 29 106 31 40 103 55 15 108 21 20 107 21 37 -66 0 0 18 8 53 6 21 -14 106 59 27 107 43 46 105 13 45 109 29 2 108 31 10 -65 0 0 18 8 49 7 20 -15 108 9 51 108 52 28 106 28 15 110 33 46 109 37 42 -64 0 0 18 8 44 8 19 -15 109 17 9 109 58 14 107 39 16 111 35 55 110 41 36 -63 0 0 18 8 39 9 18 -16 110 21 46 111 1 26 108 47 16 112 35 48 111 43 13 -62 0 0 18 8 34 11 17 -17 111 24 1 112 2 24 109 52 37 113 33 45 112 42 49 -61 0 0 18 8 27 12 16 -18 112 24 13 113 1 25 110 55 40 114 29 59 113 40 40 -60 0 0 18 8 20 13 16 -18 113 22 37 113 58 44 111 56 41 115 24 43 114 36 59 -59 0 0 18 8 13 14 15 -19 114 19 26 114 54 32 112 55 54 116 18 9 115 31 56 -58 0 0 18 8 4 15 14 -19 115 14 51 115 49 2 113 53 34 117 10 26 116 25 42 -57 0 0 18 7 56 16 13 -20 116 9 3 116 42 22 114 49 50 118 1 44 117 18 26 -56 0 0 18 7 46 17 12 -21 117 2 10 117 34 41 115 44 53 118 52 10 118 10 14 -55 0 0 18 7 36 18 12 -21 117 54 22 118 26 8 116 38 51 119 41 50 119 1 15 -54 0 0 18 7 25 19 11 -22 118 45 44 119 16 48 117 31 53 120 30 52 119 51 35 -53 0 0 18 7 14 20 10 -22 119 36 23 120 6 48 118 24 5 121 19 20 120 41 19 -52 0 0 18 7 2 21 9 -23 120 26 25 120 56 14 119 15 34 122 7 20 121 30 33 -51 0 0 18 6 50 22 9 -23 121 15 55 121 45 10 120 6 25 122 54 57 122 19 20 -50 0 0 18 6 37 23 8 -23 122 4 58 122 33 42 120 56 44 123 42 14 123 7 46 -49 0 0 18 6 23 25 7 -24 122 53 39 123 21 53 121 46 36 124 29 15 123 55 54 -48 0 0 18 6 9 26 6 -24 123 42 1 124 9 48 122 36 4 125 16 4 124 43 49 -47 0 0 18 5 54 27 6 -25 124 30 9 124 57 29 123 25 13 126 2 44 125 31 32 -46 0 0 18 5 39 28 5 -25 125 18 4 125 45 1 124 14 7 126 49 18 126 19 9 -45 0 0 18 5 23 29 4 -25 126 5 52 126 32 26 125 2 49 127 35 50 127 6 40 -44 0 0 18 5 6 30 3 -26 126 53 34 127 19 47 125 51 22 128 22 21 127 54 11 -43 0 0 18 4 49 31 3 -26 127 41 15 128 7 7 126 39 49 129 8 55 128 41 42 -42 0 0 18 4 31 32 2 -26 128 28 55 128 54 30 127 28 14 129 55 33 129 29 17 -41 0 0 18 4 13 33 1 -26 129 16 39 129 41 56 128 16 39 130 42 19 130 16 58 -40 0 0 18 3 54 34 0 -27 130 4 27 130 29 29 129 5 6 131 29 15 131 4 47 -39 0 0 18 3 35 35 359 -27 130 52 24 131 17 11 129 53 38 132 16 22 131 52 47 -38 0 0 18 3 15 36 359 -27 131 40 31 132 5 4 130 42 17 133 3 42 132 41 0 -37 0 0 18 2 54 37 358 -27 132 28 50 132 53 10 131 31 6 133 51 19 133 29 27 -36 0 0 18 2 33 38 357 -27 133 17 23 133 41 32 132 20 8 134 39 14 134 18 12 -35 0 0 18 2 12 39 356 -27 134 6 13 134 30 12 133 9 23 135 27 29 135 7 16 -34 0 0 18 1 50 40 355 -27 134 55 22 135 19 11 133 58 55 136 16 5 135 56 41 -33 0 0 18 1 27 41 354 -27 135 44 52 136 8 32 134 48 46 137 5 6 136 46 30 -32 0 0 18 1 4 42 353 -27 136 34 44 136 58 17 135 38 57 137 54 33 137 36 44 -31 0 0 18 0 40 42 352 -27 137 25 2 137 48 27 136 29 31 138 44 28 138 27 26 -30 0 0 18 0 15 43 351 -27 138 15 46 138 39 6 137 20 30 139 34 53 139 18 37 -29 0 0 17 59 51 44 350 -27 139 7 0 139 30 15 138 11 56 140 25 50 140 10 21 -28 0 0 17 59 25 45 348 -27 139 58 46 140 21 56 139 3 52 141 17 22 141 2 38 -27 0 0 17 58 59 46 347 -27 140 51 5 141 14 12 139 56 20 142 9 31 141 55 32 -26 0 0 17 58 33 47 346 -27 141 44 0 142 7 5 140 49 21 143 2 18 142 49 5 -25 0 0 17 58 6 47 345 -26 142 37 34 143 0 37 141 42 59 143 55 48 143 43 19 -24 0 0 17 57 38 48 343 -26 143 31 49 143 54 51 142 37 15 144 50 1 144 38 18 -23 0 0 17 57 10 49 342 -26 144 26 47 144 49 50 143 32 13 145 45 0 145 34 2 -22 0 0 17 56 42 50 340 -26 145 22 31 145 45 35 144 27 55 146 40 50 146 30 37 -21 0 0 17 56 13 50 339 -25 146 19 4 146 42 11 145 24 23 147 37 31 147 28 4 -20 0 0 17 55 43 51 337 -25 147 16 29 147 39 39 146 21 41 148 35 8 148 26 26 -19 0 0 17 55 13 52 335 -24 148 14 50 148 38 4 147 19 53 149 33 44 149 25 48 -18 0 0 17 54 43 52 334 -24 149 14 9 149 37 28 148 19 0 150 33 21 150 26 12 -17 0 0 17 54 11 53 332 -23 150 14 30 150 37 56 149 19 7 151 34 5 151 27 43 -16 0 0 17 53 40 53 330 -23 151 15 57 151 39 31 150 20 17 152 35 59 152 30 25 -15 0 0 17 53 8 53 328 -22 152 18 35 152 42 17 151 22 34 153 39 8 153 34 22 -14 0 0 17 52 35 54 326 -22 153 22 27 153 46 19 152 26 3 154 43 36 154 39 40 -13 0 0 17 52 2 54 324 -21 154 27 39 154 51 43 153 30 48 155 49 28 155 46 23 -12 0 0 17 51 28 54 322 -20 155 34 15 155 58 33 154 36 55 156 56 51 156 54 38 -11 0 0 17 50 54 54 320 -20 156 42 23 157 6 55 155 44 29 158 5 50 158 4 31 -10 0 0 17 50 19 55 317 -19 157 52 7 158 16 56 156 53 36 159 16 33 159 16 9 - 9 0 0 17 49 44 55 315 -18 159 3 36 159 28 44 158 4 22 160 29 7 160 29 40 - 8 0 0 17 49 8 54 313 -17 160 16 57 160 42 26 159 16 56 161 43 41 161 45 14 - 7 0 0 17 48 32 54 311 -16 161 32 19 161 58 11 160 31 25 163 0 25 163 3 0 - 6 0 0 17 47 55 54 309 -15 162 49 52 163 16 10 161 47 59 164 19 29 164 23 9 - 5 0 0 17 47 17 54 307 -14 164 9 47 164 36 34 163 6 48 165 41 6 165 45 55 - 4 0 0 17 46 39 53 304 -13 165 32 17 165 59 37 164 28 3 167 5 31 167 11 33 - 3 0 0 17 46 0 53 302 -12 166 57 37 167 25 33 165 52 0 168 32 59 168 40 20 - 2 0 0 17 45 21 52 300 -11 168 26 3 168 54 41 167 18 52 170 3 52 170 12 36 - 1 0 0 17 44 40 52 298 -10 169 57 56 170 27 21 168 48 59 171 38 31 171 48 46 0 0 0 17 43 59 51 296 -9 171 33 39 172 3 58 170 22 42 173 17 25 173 29 19 1 0 0 17 43 18 50 294 -7 173 13 41 173 45 2 172 0 25 175 1 7 Latitude Latitude Latitude Latitude 174 0 0 1 17 45 17 43 5 49 294 -7 1 26 51 1 8 39 2 9 53 0 25 0 175 0 0 1 51 45 17 42 41 49 293 -6 2 0 46 1 42 42 2 43 30 0 59 22 176 0 0 2 24 45 17 42 17 48 292 -5 2 33 43 2 15 46 3 16 9 1 32 45 177 0 0 2 56 48 17 41 53 48 291 -4 3 5 42 2 47 53 3 47 51 2 5 10 178 0 0 3 27 53 17 41 30 47 290 -4 3 36 44 3 19 2 4 18 36 2 36 36 179 0 0 3 58 2 17 41 8 46 290 -3 4 6 49 3 49 13 4 48 25 3 7 4 180 0 0 4 27 13 17 40 45 46 289 -2 4 35 57 4 18 28 5 17 18 3 36 34 -179 0 0 4 55 29 17 40 24 45 288 -1 5 4 10 4 46 47 5 45 16 4 5 8 -178 0 0 5 22 48 17 40 2 44 288 0 5 31 26 5 14 9 6 12 18 4 32 45 Uncertainty in time = +/- 16 secs [Prediction of 2008 Sep 11.0] Data for the target star ------------------------ * name: TYC 1264-00559-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 16 16.9127 DE: +16 17 07.506 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .019 ) * V mag [mag]: 10.1 * B mag [mag]: 10.8 * Apparent position with proper motion RA(deg): 64.2028616098 DE(deg): 16.3100896251 * Equation of equinoxes (radians) : 0.000047782004876 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1766) Slipher approx. diameter [km]: 24 approx. diameter ["]: .019 distance from Earth [AU]: 1.78200 * orbital information: orbit source: Preston date of fit: 2008 Aug 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 868 number of rejected observations: 16 time covered by the observations: 1953 Oct 30 - 2007 Dec 05 1 sigma uncertainty ellipse (major, minor, PA): 0.051, 0.033, 83° remarks: * orbital elements for (1766) Slipher : Mean anomaly = 42.93511008 deg Arg. of pericenter = 170.52959436 deg Long. of node = 188.87243619 deg Inclination = 5.22222076 deg Eccentricity = 0.08511250 Semimajor axis = 2.74930889 AU Perihelion dist = 2.51530833 AU Mag: H = 12.33, G = 0.15 Epoch of elements : MJD 54752.74300000 TDT (2008 Oct 13.743) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 13 1766 Slipher 17h 50.0m UT 10.1 4 16 16.913 16 17 7.51TYC 1264-00559-1 10.8 15.9 24 5.3 1.782 -0.616 -8.96 133.9211 16.287 -90.97 -8.11 17.8326 0.41330 -0.40696 -1.79259 -1.81554 -0.00397 -0.00035 2000 42.34205620081011.00000170.529594188.872436 5.2222210.08511250 2.7493089 2.515308311.7 5.00.15 RATE 2.1620650 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.055 0.038 84 3.38 0.045 0 54720.5020081013_0559-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 11, 17:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org