IOTA/IOTA-ES occultation update for (287) Nephthys / TYC 5269-01778-1 event on 2012 Oct 28, 14:28 UT Visible from Philippines, SE Asia Summary ------- On 2012 Oct 28 UT, the 66 km diameter asteroid (287) Nephthys will occult a 10.1 mag star in the constellation Cetus for observers along a path across Philippines, SE Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.8 mag to 11.7 mag (the magnitude of the asteroid) for at most 9.8 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: 96 * date and approx. time of event: 2012 Oct 28, 14:14 - 2012 Oct 28, 14:41 UT * geocentric midpoint of event [JD]: 2456229.103075 * magnitude of target star: 10.1 * magnitude drop [mag]: 1.8 * estimated maximum duration [s]: 9.8 * Moon: 99 % sunlit, 24° distance * Sun: 146° distance * rough path description: Philippines, SE Asia The occultation path -------------------- * approximate projected width [km]: 73 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .025", 87° ) * approx speed of asteroid's shadow [km/s]: 6.7126 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5269-01778-1 by 287 Nephthys on 2012 Oct 28 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 45 0 0 4 40 51 14 41 33 22 103 -1 5 0 36 4 21 9 5 16 50 4 5 2 46 0 0 4 38 31 14 41 26 23 103 -1 4 58 15 4 18 49 5 14 29 4 2 43 47 0 0 4 36 32 14 41 19 24 104 -2 4 56 17 4 16 52 5 12 30 4 0 45 48 0 0 4 34 57 14 41 11 25 104 -3 4 54 41 4 15 16 5 10 54 3 59 10 49 0 0 4 33 44 14 41 4 26 104 -4 4 53 27 4 14 3 5 9 40 3 57 58 50 0 0 4 32 53 14 40 56 27 104 -5 4 52 36 4 13 13 5 8 48 3 57 7 51 0 0 4 32 24 14 40 48 28 104 -6 4 52 7 4 12 44 5 8 19 3 56 39 52 0 0 4 32 17 14 40 40 29 104 -7 4 52 0 4 12 37 5 8 12 3 56 33 53 0 0 4 32 32 14 40 31 30 105 -8 4 52 15 4 12 53 5 8 27 3 56 48 54 0 0 4 33 10 14 40 22 31 105 -9 4 52 52 4 13 31 5 9 4 3 57 26 55 0 0 4 34 9 14 40 13 32 105 -10 4 53 52 4 14 30 5 10 3 3 58 25 56 0 0 4 35 30 14 40 4 32 105 -11 4 55 13 4 15 51 5 11 25 3 59 46 57 0 0 4 37 13 14 39 54 33 106 -12 4 56 56 4 17 34 5 13 8 4 1 29 58 0 0 4 39 18 14 39 45 34 106 -13 4 59 1 4 19 39 5 15 13 4 3 34 59 0 0 4 41 44 14 39 35 35 106 -14 5 1 27 4 22 5 5 17 39 4 6 0 60 0 0 4 44 32 14 39 25 36 106 -15 5 4 15 4 24 52 5 20 27 4 8 47 61 0 0 4 47 41 14 39 14 37 107 -16 5 7 24 4 28 1 5 23 37 4 11 56 62 0 0 4 51 12 14 39 4 38 107 -16 5 10 55 4 31 32 5 27 8 4 15 26 63 0 0 4 55 4 14 38 53 39 108 -17 5 14 48 4 35 23 5 31 0 4 19 17 64 0 0 4 59 17 14 38 42 40 108 -18 5 19 1 4 39 36 5 35 14 4 23 30 65 0 0 5 3 51 14 38 31 41 108 -19 5 23 35 4 44 9 5 39 49 4 28 3 66 0 0 5 8 46 14 38 19 41 109 -20 5 28 31 4 49 4 5 44 45 4 32 57 67 0 0 5 14 2 14 38 8 42 109 -21 5 33 47 4 54 19 5 50 1 4 38 12 68 0 0 5 19 38 14 37 56 43 110 -22 5 39 24 4 59 55 5 55 39 4 43 47 69 0 0 5 25 35 14 37 44 44 110 -23 5 45 22 5 5 52 6 1 37 4 49 44 70 0 0 5 31 53 14 37 32 45 111 -24 5 51 40 5 12 9 6 7 56 4 56 0 71 0 0 5 38 31 14 37 20 46 111 -25 5 58 19 5 18 46 6 14 35 5 2 37 72 0 0 5 45 29 14 37 7 47 112 -26 6 5 18 5 25 44 6 21 35 5 9 34 73 0 0 5 52 48 14 36 54 47 112 -27 6 12 37 5 33 1 6 28 55 5 16 51 74 0 0 6 0 26 14 36 42 48 113 -28 6 20 16 5 40 39 6 36 35 5 24 28 75 0 0 6 8 24 14 36 29 49 114 -29 6 28 15 5 48 37 6 44 34 5 32 25 76 0 0 6 16 43 14 36 15 50 114 -30 6 36 34 5 56 54 6 52 54 5 40 41 77 0 0 6 25 20 14 36 2 51 115 -31 6 45 13 6 5 31 7 1 33 5 49 17 78 0 0 6 34 17 14 35 49 51 116 -32 6 54 11 6 14 27 7 10 32 5 58 13 79 0 0 6 43 34 14 35 35 52 117 -33 7 3 28 6 23 42 7 19 50 6 7 27 80 0 0 6 53 9 14 35 21 53 117 -34 7 13 5 6 33 17 7 29 28 6 17 1 81 0 0 7 3 4 14 35 7 54 118 -34 7 23 1 6 43 10 7 39 24 6 26 54 82 0 0 7 13 17 14 34 53 54 119 -35 7 33 15 6 53 23 7 49 40 6 37 6 83 0 0 7 23 50 14 34 39 55 120 -36 7 43 48 7 3 54 8 0 14 6 47 36 84 0 0 7 34 40 14 34 25 56 121 -37 7 54 40 7 14 44 8 11 7 6 58 24 85 0 0 7 45 49 14 34 11 57 122 -38 8 5 51 7 25 51 8 22 18 7 9 31 86 0 0 7 57 17 14 33 56 57 123 -39 8 17 19 7 37 18 8 33 47 7 20 57 87 0 0 8 9 2 14 33 41 58 125 -40 8 29 5 7 49 2 8 45 35 7 32 40 88 0 0 8 21 5 14 33 27 59 126 -41 8 41 10 8 1 3 8 57 40 7 44 41 89 0 0 8 33 26 14 33 12 59 127 -42 8 53 32 8 13 23 9 10 3 7 56 59 90 0 0 8 46 4 14 32 57 60 129 -43 9 6 11 8 26 0 9 22 44 8 9 35 91 0 0 8 58 59 14 32 42 60 130 -44 9 19 8 8 38 54 9 35 42 8 22 28 92 0 0 9 12 12 14 32 27 61 132 -45 9 32 22 8 52 5 9 48 57 8 35 38 93 0 0 9 25 41 14 32 12 61 133 -46 9 45 53 9 5 33 10 2 28 8 49 5 94 0 0 9 39 27 14 31 56 62 135 -47 9 59 40 9 19 18 10 16 17 9 2 48 95 0 0 9 53 30 14 31 41 62 137 -48 10 13 44 9 33 19 10 30 22 9 16 48 96 0 0 10 7 48 14 31 26 63 138 -49 10 28 4 9 47 36 10 44 43 9 31 4 97 0 0 10 22 23 14 31 10 63 140 -50 10 42 40 10 2 9 10 59 20 9 45 36 98 0 0 10 37 13 14 30 55 64 142 -51 10 57 31 10 16 58 11 14 13 10 0 24 99 0 0 10 52 19 14 30 39 64 144 -52 11 12 38 10 32 2 11 29 21 10 15 27 100 0 0 11 7 40 14 30 23 64 146 -52 11 28 1 10 47 22 11 44 45 10 30 45 101 0 0 11 23 16 14 30 8 65 148 -53 11 43 38 11 2 56 12 0 24 10 46 19 102 0 0 11 39 6 14 29 52 65 150 -54 11 59 30 11 18 45 12 16 17 11 2 7 103 0 0 11 55 11 14 29 36 65 153 -55 12 15 37 11 34 49 12 32 25 11 18 9 104 0 0 12 11 31 14 29 21 65 155 -56 12 31 58 11 51 7 12 48 47 11 34 26 105 0 0 12 28 4 14 29 5 65 157 -57 12 48 33 12 7 39 13 5 23 11 50 57 106 0 0 12 44 51 14 28 49 65 159 -58 13 5 21 12 24 24 13 22 13 12 7 41 107 0 0 13 1 51 14 28 33 65 162 -59 13 22 23 12 41 23 13 39 16 12 24 39 108 0 0 13 19 5 14 28 17 65 164 -60 13 39 38 12 58 35 13 56 32 12 41 49 109 0 0 13 36 31 14 28 2 65 166 -61 13 57 6 13 16 0 14 14 1 12 59 13 110 0 0 13 54 10 14 27 46 65 168 -62 14 14 46 13 33 37 14 31 42 13 16 49 111 0 0 14 12 1 14 27 30 65 171 -63 14 32 38 13 51 26 14 49 36 13 34 37 112 0 0 14 30 3 14 27 14 65 173 -64 14 50 43 14 9 28 15 7 41 13 52 37 113 0 0 14 48 18 14 26 59 65 175 -65 15 8 58 14 27 40 15 25 58 14 10 48 114 0 0 15 6 43 14 26 43 65 177 -65 15 27 25 14 46 4 15 44 26 14 29 11 115 0 0 15 25 19 14 26 27 64 180 -66 15 46 3 15 4 39 16 3 5 14 47 45 116 0 0 15 44 6 14 26 12 64 182 -67 16 4 51 15 23 24 16 21 55 15 6 29 117 0 0 16 3 3 14 25 56 64 184 -68 16 23 49 15 42 20 16 40 54 15 25 23 118 0 0 16 22 10 14 25 40 63 186 -69 16 42 58 16 1 25 17 0 4 15 44 28 119 0 0 16 41 26 14 25 25 63 188 -70 17 2 15 16 20 40 17 19 23 16 3 41 120 0 0 17 0 51 14 25 10 62 190 -71 17 21 42 16 40 4 17 38 51 16 23 4 121 0 0 17 20 25 14 24 54 62 191 -71 17 41 18 16 59 37 17 58 27 16 42 36 122 0 0 17 40 8 14 24 39 61 193 -72 18 1 1 17 19 18 18 18 12 17 2 16 123 0 0 17 59 58 14 24 24 61 195 -73 18 20 53 17 39 7 18 38 5 17 22 4 124 0 0 18 19 56 14 24 9 60 197 -74 18 40 52 17 59 4 18 58 5 17 42 0 125 0 0 18 40 2 14 23 54 60 198 -75 19 0 59 18 19 8 19 18 13 18 2 3 126 0 0 19 0 14 14 23 39 59 200 -75 19 21 12 18 39 19 19 38 27 18 22 12 127 0 0 19 20 32 14 23 24 58 201 -76 19 41 32 18 59 36 19 58 48 18 42 29 128 0 0 19 40 56 14 23 9 58 203 -77 20 1 58 19 19 59 20 19 14 19 2 51 129 0 0 20 1 27 14 22 55 57 204 -77 20 22 29 19 40 28 20 39 47 19 23 19 130 0 0 20 22 2 14 22 40 56 205 -78 20 43 5 20 1 2 21 0 24 19 43 52 131 0 0 20 42 42 14 22 26 56 207 -78 21 3 46 20 21 41 21 21 6 20 4 30 132 0 0 21 3 26 14 22 12 55 208 -79 21 24 32 20 42 25 21 41 52 20 25 13 133 0 0 21 24 15 14 21 58 54 209 -79 21 45 21 21 3 12 22 2 42 20 46 0 134 0 0 21 45 6 14 21 44 54 210 -80 22 6 14 21 24 3 22 23 36 21 6 50 135 0 0 22 6 1 14 21 30 53 211 -80 22 27 10 21 44 57 22 44 32 21 27 43 136 0 0 22 26 59 14 21 17 52 212 -80 22 48 8 22 5 54 23 5 32 21 48 39 137 0 0 22 47 59 14 21 3 51 213 -80 23 9 9 22 26 53 23 26 33 22 9 37 138 0 0 23 9 0 14 20 50 51 214 -80 23 30 11 22 47 53 23 47 36 22 30 37 139 0 0 23 30 3 14 20 37 50 215 -80 23 51 14 23 8 55 24 8 40 22 51 39 140 0 0 23 51 7 14 20 24 49 216 -79 24 12 19 23 29 59 24 29 45 23 12 42 141 0 0 24 12 11 14 20 11 48 217 -79 24 33 24 23 51 2 24 50 50 23 33 45 142 0 0 24 33 15 14 19 59 47 218 -79 24 54 29 24 12 6 25 11 56 23 54 48 143 0 0 24 54 19 14 19 46 47 219 -78 25 15 33 24 33 9 25 33 1 24 15 51 144 0 0 25 15 22 14 19 34 46 220 -78 25 36 37 24 54 12 25 54 5 24 36 53 145 0 0 25 36 24 14 19 22 45 221 -77 25 57 39 25 15 13 26 15 7 24 57 54 146 0 0 25 57 24 14 19 10 44 222 -77 26 18 39 25 36 13 26 36 8 25 18 54 147 0 0 26 18 22 14 18 59 43 222 -76 26 39 37 25 57 11 26 57 6 25 39 51 148 0 0 26 39 17 14 18 47 42 223 -75 27 0 33 26 18 6 27 18 2 26 0 46 149 0 0 27 0 10 14 18 36 42 224 -75 27 21 25 26 38 58 27 38 55 26 21 38 150 0 0 27 20 59 14 18 25 41 225 -74 27 42 14 26 59 47 27 59 44 26 42 26 151 0 0 27 41 44 14 18 14 40 225 -73 28 2 59 27 20 32 28 20 29 27 3 11 152 0 0 28 2 24 14 18 4 39 226 -72 28 23 40 27 41 12 28 41 9 27 23 52 153 0 0 28 23 0 14 17 53 38 227 -72 28 44 16 28 1 48 29 1 45 27 44 28 154 0 0 28 43 31 14 17 43 37 228 -71 29 4 47 28 22 19 29 22 16 28 4 59 155 0 0 29 3 56 14 17 33 37 228 -70 29 25 12 28 42 45 29 42 41 28 25 25 156 0 0 29 24 15 14 17 24 36 229 -69 29 45 31 29 3 4 30 3 0 28 45 44 157 0 0 29 44 28 14 17 14 35 230 -68 30 5 43 29 23 17 30 23 12 29 5 58 158 0 0 30 4 35 14 17 5 34 230 -68 30 25 49 29 43 24 30 43 18 29 26 5 159 0 0 30 24 34 14 16 56 33 231 -67 30 45 48 30 3 23 31 3 16 29 46 5 160 0 0 30 44 25 14 16 47 32 232 -66 31 5 39 30 23 15 31 23 6 30 5 57 161 0 0 31 4 9 14 16 39 31 232 -65 31 25 22 30 43 0 31 42 49 30 25 42 162 0 0 31 23 44 14 16 30 31 233 -64 31 44 57 31 2 35 32 2 23 30 45 18 163 0 0 31 43 11 14 16 22 30 234 -63 32 4 23 31 22 3 32 21 49 31 4 46 164 0 0 32 2 29 14 16 14 29 234 -62 32 23 40 31 41 21 32 41 5 31 24 5 165 0 0 32 21 37 14 16 7 28 235 -62 32 42 47 32 0 30 33 0 12 31 43 14 166 0 0 32 40 36 14 15 59 27 236 -61 33 1 45 32 19 30 33 19 9 32 2 15 167 0 0 32 59 24 14 15 52 26 236 -60 33 20 33 32 38 19 33 37 56 32 21 5 168 0 0 33 18 2 14 15 45 25 237 -59 33 39 10 32 56 58 33 56 33 32 39 45 169 0 0 33 36 30 14 15 39 25 237 -58 33 57 37 33 15 27 34 14 59 32 58 14 170 0 0 33 54 46 14 15 32 24 238 -57 34 15 52 33 33 44 34 33 13 33 16 32 171 0 0 34 12 52 14 15 26 23 239 -57 34 33 56 33 51 51 34 51 16 33 34 40 172 0 0 34 30 45 14 15 20 22 239 -56 34 51 49 34 9 46 35 9 8 33 52 35 173 0 0 34 48 27 14 15 14 21 240 -55 35 9 30 34 27 29 35 26 48 34 10 19 174 0 0 35 5 57 14 15 9 20 240 -54 35 26 58 34 44 59 35 44 15 34 27 51 175 0 0 35 23 14 14 15 4 20 241 -53 35 44 14 35 2 18 36 1 30 34 45 11 176 0 0 35 40 18 14 14 58 19 242 -52 36 1 17 35 19 24 36 18 32 35 2 17 177 0 0 35 57 10 14 14 54 18 242 -52 36 18 7 35 36 17 36 35 21 35 19 11 178 0 0 36 13 48 14 14 49 17 243 -51 36 34 44 35 52 56 36 51 57 35 35 52 179 0 0 36 30 13 14 14 45 16 244 -50 36 51 8 36 9 23 37 8 19 35 52 20 180 0 0 36 46 25 14 14 41 15 244 -49 37 7 18 36 25 36 37 24 28 36 8 34 -179 0 0 37 2 22 14 14 37 15 245 -48 37 23 14 36 41 34 37 40 23 36 24 34 -178 0 0 37 18 6 14 14 33 14 245 -47 37 38 56 36 57 19 37 56 3 36 40 20 -177 0 0 37 33 35 14 14 30 13 246 -47 37 54 23 37 12 50 38 11 29 36 55 52 -176 0 0 37 48 49 14 14 26 12 247 -46 38 9 36 37 28 6 38 26 41 37 11 10 -175 0 0 38 3 49 14 14 23 11 247 -45 38 24 35 37 43 8 38 41 38 37 26 12 -174 0 0 38 18 35 14 14 21 10 248 -44 38 39 18 37 57 55 38 56 21 37 41 1 -173 0 0 38 33 5 14 14 18 10 248 -43 38 53 47 38 12 27 39 10 48 37 55 34 -172 0 0 38 47 20 14 14 16 9 249 -42 39 8 0 38 26 43 39 25 0 38 9 52 -171 0 0 39 1 20 14 14 14 8 250 -42 39 21 58 38 40 45 39 38 57 38 23 55 -170 0 0 39 15 4 14 14 12 7 250 -41 39 35 41 38 54 31 39 52 38 38 37 42 -169 0 0 39 28 33 14 14 10 6 251 -40 39 49 8 39 8 1 40 6 4 38 51 14 -168 0 0 39 41 46 14 14 8 6 252 -39 40 2 19 39 21 16 40 19 14 39 4 30 -167 0 0 39 54 43 14 14 7 5 252 -38 40 15 15 39 34 15 40 32 8 39 17 31 -166 0 0 40 7 25 14 14 6 4 253 -38 40 27 55 39 46 58 40 44 46 39 30 15 -165 0 0 40 19 50 14 14 5 3 254 -37 40 40 18 39 59 25 40 57 8 39 42 43 -164 0 0 40 31 59 14 14 4 2 254 -36 40 52 26 40 11 36 41 9 14 39 54 56 -163 0 0 40 43 52 14 14 4 2 255 -35 41 4 17 40 23 31 41 21 4 40 6 52 -162 0 0 40 55 29 14 14 4 1 255 -35 41 15 52 40 35 9 41 32 37 40 18 31 -161 0 0 41 6 49 14 14 3 0 256 -34 41 27 10 40 46 31 .. .. .. 40 29 55 Uncertainty in time = +/- 4 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 5269-01778-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 35 52.4736 DE: -10 26 58.599 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .024 ) * V mag [mag]: 10.1 * B mag [mag]: 10.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (287) Nephthys approx. diameter [km]: 66 approx. diameter ["]: .061 distance from Earth [AU]: 1.48500 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1916 number of rejected observations: 150 time covered by the observations: 1900 Sep 21 - 2012 Oct 25 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.008, 75° remarks: * orbital elements for (287) Nephthys : Mean anomaly = 114.38298731 deg Arg. of pericenter = 117.94024142 deg Long. of node = 142.43742424 deg Inclination = 10.02786677 deg Eccentricity = 0.02318860 Semimajor axis = 2.35268657 AU Perihelion dist = 2.29813106 AU Mag: H = 8.27, G = 0.22 Epoch of elements : MJD 56228.60300000 TDT (2012 Oct 28.603) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 28 287 Nephthys 14h 28.4m UT 10.1 0 35 52.474-10 26 58.60TYC 5269-01778-1 10.6 11.7 66 9.8 1.485 -1.451 -6.63 114.5236 -10.447 -41.16 -13.38 14.4738 -0.12235 0.39663 -3.61904 -1.12143 0.00225 0.00218 2000 112.03331220121020.00000117.940241142.437424 10.0278670.02318860 2.3526866 2.2981311 8.3 5.00.22 RATE 2.7312280 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.026 0.025 87 1.41 0.025 0 0-4 1 056226.0020121028_1778-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org