IOTA/IOTA-ES occultation update for (1200) Imperatrix / UCAC2 36760156 event on 2012 Dec 19, 13:22 UT Visible from Japan, China, India Summary ------- On 2012 Dec 19 UT, the 44 km diameter asteroid (1200) Imperatrix will occult a 11.5 mag star in the constellation Aries for observers along a path across Japan, China, India. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.4 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: 44 * date and approx. time of event: 2012 Dec 19, 13:10 - 2012 Dec 19, 13:32 UT * geocentric midpoint of event [JD]: 2456281.05760417 * magnitude of target star: 11.5 * magnitude drop [mag]: 4.4 * estimated maximum duration [s]: 5.3 * Moon: 44 % sunlit, 58° distance * Sun: 140° distance * rough path description: Japan, China, India Additional comments ------------------- 2" double star The occultation path -------------------- * approximate projected width [km]: 48 * 1 sigma uncertainty interval [path widths]: +/- 1.50 * 1 sigma uncertainty interval [seconds]: +/- 9.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .036", 85° ) * approx speed of asteroid's shadow [km/s]: 8.1589 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 36760156 by 1200 Imperatrix on 2012 Dec 19 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 59 0 0 17 47 41 13 32 18 36 85 -1 18 1 29 17 33 55 18 43 0 16 52 45 60 0 0 18 10 16 13 32 9 37 86 -2 18 24 4 17 56 29 19 5 38 17 15 17 61 0 0 18 32 55 13 32 0 38 86 -3 18 46 44 18 19 7 19 28 19 17 37 54 62 0 0 18 55 36 13 31 51 39 87 -4 19 9 25 18 41 48 19 51 2 18 0 33 63 0 0 19 18 20 13 31 42 39 87 -5 19 32 10 19 4 31 20 13 48 18 23 15 64 0 0 19 41 5 13 31 33 40 88 -6 19 54 55 19 27 16 20 36 35 18 45 59 65 0 0 20 3 52 13 31 23 41 89 -6 20 17 43 19 50 3 20 59 23 19 8 44 66 0 0 20 26 40 13 31 14 42 89 -7 20 40 31 20 12 50 21 22 13 19 31 30 67 0 0 20 49 28 13 31 4 43 90 -8 21 3 19 20 35 38 21 45 2 19 54 16 68 0 0 21 12 15 13 30 54 44 91 -9 21 26 7 20 58 25 22 7 51 20 17 3 69 0 0 21 35 2 13 30 44 45 91 -10 21 48 54 21 21 12 22 30 39 20 39 48 70 0 0 21 57 48 13 30 34 46 92 -11 22 11 40 21 43 57 22 53 26 21 2 33 71 0 0 22 20 32 13 30 24 47 93 -12 22 34 25 22 6 41 23 16 11 21 25 16 72 0 0 22 43 14 13 30 13 48 94 -13 22 57 7 22 29 23 23 38 54 21 47 58 73 0 0 23 5 53 13 30 3 48 94 -14 23 19 46 22 52 2 24 1 34 22 10 36 74 0 0 23 28 29 13 29 52 49 95 -15 23 42 22 23 14 38 24 24 10 22 33 12 75 0 0 23 51 2 13 29 42 50 96 -16 24 4 55 23 37 10 24 46 43 22 55 44 76 0 0 24 13 31 13 29 31 51 97 -17 24 27 24 23 59 39 25 9 12 23 18 13 77 0 0 24 35 55 13 29 20 52 98 -18 24 49 48 24 22 3 25 31 36 23 40 37 78 0 0 24 58 14 13 29 9 52 99 -19 25 12 7 24 44 22 25 53 55 24 2 56 79 0 0 25 20 27 13 28 58 53 100 -20 25 34 20 25 6 36 26 16 8 24 25 10 80 0 0 25 42 35 13 28 47 54 102 -21 25 56 28 25 28 44 26 38 16 24 47 18 81 0 0 26 4 37 13 28 35 55 103 -22 26 18 30 25 50 45 27 0 17 25 9 20 82 0 0 26 26 32 13 28 24 56 104 -23 26 40 24 26 12 41 27 22 11 25 31 16 83 0 0 26 48 20 13 28 13 56 105 -24 27 2 12 26 34 29 27 43 58 25 53 4 84 0 0 27 10 0 13 28 2 57 106 -25 27 23 52 26 56 9 28 5 38 26 14 46 85 0 0 27 31 32 13 27 50 58 108 -25 27 45 24 27 17 42 28 27 9 26 36 19 86 0 0 27 52 57 13 27 39 58 109 -26 28 6 48 27 39 7 28 48 32 26 57 45 87 0 0 28 14 12 13 27 27 59 111 -27 28 28 4 28 0 22 29 9 46 27 19 2 88 0 0 28 35 19 13 27 16 60 112 -28 28 49 10 28 21 29 29 30 52 27 40 10 89 0 0 28 56 16 13 27 4 60 114 -29 29 10 7 28 42 27 29 51 47 28 1 8 90 0 0 29 17 4 13 26 52 61 115 -30 29 30 54 29 3 15 30 12 33 28 21 58 91 0 0 29 37 41 13 26 41 62 117 -31 29 51 31 29 23 53 30 33 8 28 42 37 92 0 0 29 58 8 13 26 29 62 119 -32 30 11 57 29 44 20 30 53 33 29 3 6 93 0 0 30 18 24 13 26 18 63 121 -33 30 32 13 30 4 37 31 13 48 29 23 24 94 0 0 30 38 30 13 26 6 63 123 -33 30 52 18 30 24 43 31 33 51 29 43 32 95 0 0 30 58 24 13 25 54 64 125 -34 31 12 11 30 44 38 31 53 42 30 3 28 96 0 0 31 18 6 13 25 43 64 127 -35 31 31 53 31 4 21 32 13 22 30 23 13 97 0 0 31 37 37 13 25 31 65 129 -36 31 51 23 31 23 52 32 32 50 30 42 46 98 0 0 31 56 55 13 25 19 65 131 -37 32 10 40 31 43 11 32 52 6 31 2 7 99 0 0 32 16 1 13 25 8 65 133 -38 32 29 46 32 2 17 33 11 9 31 21 16 100 0 0 32 34 54 13 24 56 66 135 -38 32 48 38 32 21 11 33 29 59 31 40 12 101 0 0 32 53 34 13 24 45 66 137 -39 33 7 18 32 39 52 33 48 37 31 58 55 102 0 0 33 12 1 13 24 33 66 140 -40 33 25 44 32 58 20 34 7 1 32 17 25 103 0 0 33 30 15 13 24 21 67 142 -41 33 43 57 33 16 35 34 25 11 32 35 42 104 0 0 33 48 15 13 24 10 67 145 -42 34 1 56 33 34 36 34 43 8 32 53 45 105 0 0 34 6 2 13 23 58 67 147 -43 34 19 42 33 52 23 35 0 51 33 11 35 106 0 0 34 23 34 13 23 47 67 150 -43 34 37 13 34 9 56 35 18 20 33 29 10 107 0 0 34 40 52 13 23 36 67 152 -44 34 54 30 34 27 15 35 35 35 33 46 32 108 0 0 34 57 56 13 23 24 67 155 -45 35 11 33 34 44 19 35 52 35 34 3 39 109 0 0 35 14 45 13 23 13 67 157 -46 35 28 21 35 1 9 36 9 20 34 20 32 110 0 0 35 31 19 13 23 2 67 160 -46 35 44 55 35 17 45 36 25 51 34 37 10 111 0 0 35 47 39 13 22 51 67 162 -47 36 1 14 35 34 5 36 42 7 34 53 33 112 0 0 36 3 43 13 22 39 67 165 -48 36 17 17 35 50 11 36 58 8 35 9 41 113 0 0 36 19 33 13 22 28 67 167 -49 36 33 6 36 6 1 37 13 53 35 25 34 114 0 0 36 35 7 13 22 17 67 170 -49 36 48 39 36 21 36 37 29 23 35 41 12 115 0 0 36 50 25 13 22 6 67 172 -50 37 3 56 36 36 56 37 44 38 35 56 35 116 0 0 37 5 29 13 21 55 67 175 -51 37 18 59 36 52 0 37 59 37 36 11 42 117 0 0 37 20 16 13 21 44 67 177 -52 37 33 45 37 6 48 38 14 21 36 26 33 118 0 0 37 34 48 13 21 34 67 180 -52 37 48 16 37 21 21 38 28 49 36 41 9 119 0 0 37 49 4 13 21 23 66 182 -53 38 2 31 37 35 38 38 43 1 36 55 29 120 0 0 38 3 4 13 21 12 66 184 -54 38 16 30 37 49 39 38 56 57 37 9 33 121 0 0 38 16 48 13 21 2 66 186 -54 38 30 13 38 3 24 39 10 36 37 23 21 122 0 0 38 30 16 13 20 51 65 189 -55 38 43 40 38 16 53 39 24 0 37 36 52 123 0 0 38 43 27 13 20 41 65 191 -56 38 56 50 38 30 6 39 37 8 37 50 8 124 0 0 38 56 23 13 20 30 65 193 -56 39 9 45 38 43 2 39 49 59 38 3 8 125 0 0 39 9 2 13 20 20 64 195 -57 39 22 23 38 55 42 40 2 35 38 15 51 126 0 0 39 21 25 13 20 10 64 197 -58 39 34 45 39 8 6 40 14 54 38 28 17 127 0 0 39 33 31 13 20 0 64 199 -58 39 46 51 39 20 14 40 26 56 38 40 28 128 0 0 39 45 21 13 19 49 63 201 -59 39 58 40 39 32 5 40 38 42 38 52 22 129 0 0 39 56 55 13 19 39 63 202 -59 40 10 12 39 43 39 40 50 12 39 3 59 130 0 0 40 8 12 13 19 30 62 204 -60 40 21 28 39 54 57 41 1 25 39 15 20 131 0 0 40 19 12 13 19 20 62 206 -61 40 32 28 40 5 59 41 12 21 39 26 24 132 0 0 40 29 56 13 19 10 61 208 -61 40 43 11 40 16 43 41 23 1 39 37 12 133 0 0 40 40 24 13 19 0 61 209 -62 40 53 37 40 27 12 41 33 25 39 47 43 134 0 0 40 50 34 13 18 51 60 211 -62 41 3 47 40 37 23 41 43 31 39 57 57 135 0 0 41 0 28 13 18 41 60 212 -63 41 13 40 40 47 18 41 53 22 40 7 55 136 0 0 41 10 5 13 18 32 59 214 -63 41 23 16 40 56 56 42 2 55 40 17 36 137 0 0 41 19 26 13 18 22 59 215 -64 41 32 36 41 6 17 42 12 12 40 27 0 138 0 0 41 28 30 13 18 13 58 217 -64 41 41 38 41 15 22 42 21 12 40 36 7 139 0 0 41 37 17 13 18 4 58 218 -65 41 50 25 41 24 10 42 29 56 40 44 58 140 0 0 41 45 47 13 17 55 57 220 -65 41 58 54 41 32 41 42 38 23 40 53 31 141 0 0 41 54 1 13 17 46 56 221 -66 42 7 7 41 40 56 42 46 33 41 1 48 142 0 0 42 1 58 13 17 37 56 222 -66 42 15 3 41 48 54 42 54 27 41 9 48 143 0 0 42 9 38 13 17 28 55 224 -66 42 22 42 41 56 34 43 2 4 41 17 32 144 0 0 42 17 1 13 17 19 55 225 -67 42 30 5 42 3 59 43 9 24 41 24 58 145 0 0 42 24 8 13 17 11 54 226 -67 42 37 11 42 11 6 43 16 27 41 32 8 146 0 0 42 30 57 13 17 2 53 227 -68 42 44 0 42 17 56 43 23 14 41 39 0 147 0 0 42 37 31 13 16 53 53 228 -68 42 50 32 42 24 30 43 29 44 41 45 36 148 0 0 42 43 47 13 16 45 52 230 -68 42 56 48 42 30 47 43 35 58 41 51 55 149 0 0 42 49 46 13 16 37 52 231 -68 43 2 47 42 36 47 43 41 55 41 57 57 150 0 0 42 55 29 13 16 28 51 232 -69 43 8 29 42 42 31 43 47 35 42 3 43 151 0 0 43 0 55 13 16 20 50 233 -69 43 13 54 42 47 57 43 52 58 42 9 11 152 0 0 43 6 4 13 16 12 50 234 -69 43 19 3 42 53 7 43 58 5 42 14 22 153 0 0 43 10 57 13 16 4 49 235 -69 43 23 54 42 58 0 44 2 55 42 19 17 154 0 0 43 15 32 13 15 56 49 236 -69 43 28 30 43 2 36 44 7 29 42 23 55 155 0 0 43 19 51 13 15 48 48 237 -70 43 32 48 43 6 56 44 11 45 42 28 16 156 0 0 43 23 53 13 15 41 47 238 -70 43 36 49 43 10 58 44 15 46 42 32 20 157 0 0 43 27 38 13 15 33 47 239 -70 43 40 34 43 14 44 44 19 29 42 36 7 158 0 0 43 31 7 13 15 26 46 240 -70 43 44 2 43 18 13 44 22 56 42 39 37 159 0 0 43 34 19 13 15 18 45 241 -70 43 47 14 43 21 25 44 26 6 42 42 51 160 0 0 43 37 14 13 15 11 45 242 -70 43 50 8 43 24 20 44 28 59 42 45 47 161 0 0 43 39 52 13 15 3 44 243 -70 43 52 46 43 26 59 44 31 36 42 48 27 162 0 0 43 42 13 13 14 56 43 244 -70 43 55 7 43 29 20 44 33 56 42 50 49 163 0 0 43 44 18 13 14 49 43 245 -70 43 57 11 43 31 25 44 35 59 42 52 55 164 0 0 43 46 5 13 14 42 42 246 -69 43 58 59 43 33 13 44 37 46 42 54 44 165 0 0 43 47 36 13 14 35 42 247 -69 44 0 29 43 34 44 44 39 16 42 56 15 166 0 0 43 48 50 13 14 28 41 248 -69 44 1 43 43 35 59 44 40 29 42 57 30 167 0 0 43 49 47 13 14 22 40 249 -69 44 2 40 43 36 56 44 41 26 42 58 28 168 0 0 43 50 28 13 14 15 40 249 -69 44 3 20 43 37 36 44 42 6 42 59 9 169 0 0 43 50 51 13 14 8 39 250 -68 44 3 44 43 38 0 44 42 29 42 59 33 170 0 0 43 50 58 13 14 2 38 251 -68 44 3 50 43 38 6 44 42 35 42 59 39 171 0 0 43 50 47 13 13 56 38 252 -68 44 3 40 43 37 56 44 42 24 42 59 29 172 0 0 43 50 20 13 13 49 37 253 -68 44 3 12 43 37 29 44 41 57 42 59 2 173 0 0 43 49 35 13 13 43 36 254 -67 44 2 28 43 36 44 44 41 13 42 58 17 174 0 0 43 48 34 13 13 37 36 254 -67 44 1 27 43 35 43 44 40 11 42 57 16 175 0 0 43 47 16 13 13 31 35 255 -67 44 0 8 43 34 24 44 38 53 42 55 57 176 0 0 43 45 40 13 13 25 34 256 -66 43 58 33 43 32 49 44 37 18 42 54 21 177 0 0 43 43 48 13 13 19 34 257 -66 43 56 41 43 30 56 44 35 27 42 52 28 178 0 0 43 41 38 13 13 13 33 258 -65 43 54 31 43 28 46 44 33 18 42 50 18 179 0 0 43 39 11 13 13 8 32 258 -65 43 52 5 43 26 19 44 30 52 42 47 50 180 0 0 43 36 28 13 13 2 31 259 -64 43 49 21 43 23 35 44 28 9 42 45 5 -179 0 0 43 33 26 13 12 57 31 260 -64 43 46 20 43 20 34 44 25 9 42 42 3 -178 0 0 43 30 8 13 12 52 30 261 -64 43 43 2 43 17 15 44 21 52 42 38 43 -177 0 0 43 26 32 13 12 46 29 262 -63 43 39 27 43 13 39 44 18 18 42 35 6 -176 0 0 43 22 39 13 12 41 29 262 -63 43 35 34 43 9 46 44 14 26 42 31 12 -175 0 0 43 18 29 13 12 36 28 263 -62 43 31 24 43 5 35 44 10 17 42 27 0 -174 0 0 43 14 1 13 12 31 27 264 -61 43 26 57 43 1 7 44 5 51 42 22 30 -173 0 0 43 9 16 13 12 26 27 265 -61 43 22 12 42 56 21 44 1 8 42 17 43 -172 0 0 43 4 14 13 12 22 26 265 -60 43 17 10 42 51 18 43 56 7 42 12 39 -171 0 0 42 58 53 13 12 17 25 266 -60 43 11 51 42 45 57 43 50 49 42 7 16 -170 0 0 42 53 16 13 12 13 24 267 -59 43 6 13 42 40 19 43 45 14 42 1 36 -169 0 0 42 47 20 13 12 8 24 267 -59 43 0 19 42 34 23 43 39 21 41 55 39 -168 0 0 42 41 7 13 12 4 23 268 -58 42 54 6 42 28 9 43 33 10 41 49 23 -167 0 0 42 34 36 13 12 0 22 269 -58 42 47 36 42 21 38 43 26 42 41 42 50 -166 0 0 42 27 48 13 11 56 22 270 -57 42 40 48 42 14 49 43 19 56 41 35 59 -165 0 0 42 20 42 13 11 52 21 270 -56 42 33 43 42 7 42 43 12 53 41 28 49 -164 0 0 42 13 17 13 11 48 20 271 -56 42 26 19 42 0 17 43 5 32 41 21 22 -163 0 0 42 5 35 13 11 44 19 272 -55 42 18 38 41 52 34 42 57 53 41 13 37 -162 0 0 41 57 35 13 11 41 19 272 -54 42 10 39 41 44 33 42 49 56 41 5 34 -161 0 0 41 49 17 13 11 37 18 273 -54 42 2 21 41 36 14 42 41 41 40 57 13 -160 0 0 41 40 41 13 11 34 17 274 -53 41 53 46 41 27 38 42 33 9 40 48 34 -159 0 0 41 31 47 13 11 31 16 274 -52 41 44 53 41 18 43 42 24 18 40 39 36 -158 0 0 41 22 35 13 11 27 16 275 -52 41 35 42 41 9 30 42 15 9 40 30 20 -157 0 0 41 13 5 13 11 24 15 276 -51 41 26 12 40 59 58 42 5 43 40 20 46 -156 0 0 41 3 16 13 11 22 14 277 -50 41 16 25 40 50 9 41 55 58 40 10 54 -155 0 0 40 53 9 13 11 19 13 277 -50 41 6 19 40 40 1 41 45 55 40 0 44 -154 0 0 40 42 44 13 11 16 13 278 -49 40 55 55 40 29 35 41 35 34 39 50 15 -153 0 0 40 32 1 13 11 14 12 278 -48 40 45 12 40 18 51 41 24 54 39 39 27 -152 0 0 40 20 59 13 11 12 11 279 -48 40 34 12 40 7 48 41 13 57 39 28 22 -151 0 0 40 9 39 13 11 9 10 280 -47 40 22 53 39 56 27 41 2 41 39 16 57 -150 0 0 39 58 1 13 11 7 10 280 -46 40 11 15 39 44 47 40 51 7 39 5 15 -149 0 0 39 46 4 13 11 6 9 281 -45 39 59 19 39 32 49 40 39 14 38 53 14 -148 0 0 39 33 49 13 11 4 8 282 -45 39 47 5 39 20 33 40 27 3 38 40 54 -147 0 0 39 21 15 13 11 2 7 282 -44 39 34 33 39 7 58 40 14 34 38 28 16 -146 0 0 39 8 23 13 11 1 6 283 -43 39 21 42 38 55 5 40 1 46 38 15 20 -145 0 0 38 55 12 13 11 0 6 284 -42 39 8 32 38 41 54 39 48 40 38 2 5 -144 0 0 38 41 43 13 10 59 5 284 -42 38 55 5 38 28 23 39 35 16 37 48 31 -143 0 0 38 27 56 13 10 58 4 285 -41 38 41 18 38 14 35 39 21 33 37 34 39 -142 0 0 38 13 50 13 10 57 3 285 -40 38 27 14 38 0 28 39 7 32 37 20 29 -141 0 0 37 59 26 13 10 56 2 286 -39 38 12 51 37 46 3 38 53 13 37 6 0 -140 0 0 37 44 44 13 10 56 1 287 -39 37 58 9 37 31 19 38 38 35 .. .. .. -139 0 0 37 29 43 13 10 56 1 287 -38 37 43 10 37 16 17 38 23 39 .. .. .. Uncertainty in time = +/- 10 secs Prediction of 2012 Dec 17.0 Data for the target star ------------------------ * name: UCAC2 36760156 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 07 40.8430 DE: +14 03 25.519 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .030, .029 ) * V mag [mag]: 11.5 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1200) Imperatrix approx. diameter [km]: 44 approx. diameter ["]: .024 distance from Earth [AU]: 2.56300 * orbital information: orbit source: Preston date of fit: 2012 Dec 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1105 number of rejected observations: 58 time covered by the observations: 1913 Mar 08 - 2012 Dec 10 1 sigma uncertainty ellipse (major, minor, PA): 0.030, 0.021, 79° remarks: * orbital elements for (1200) Imperatrix : Mean anomaly = 162.44383563 deg Arg. of pericenter = 48.19837386 deg Long. of node = 205.29655367 deg Inclination = 4.60367821 deg Eccentricity = 0.10551100 Semimajor axis = 3.06871390 AU Perihelion dist = 2.74493083 AU Mag: H = 10.82, G = 0.15 Epoch of elements : MJD 56280.55800000 TDT (2012 Dec 19.558) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 19 1200 Imperatrix 13h 23.0m UT 11.5 3 7 40.843 14 3 25.52UCAC2 36760156 0.0 15.9 44 5.3 2.563 -1.042 -4.38 117.6350 14.059 -21.40 -23.42 13.3825 -0.10482 0.36527 -4.42441 -1.27730 0.00367 0.00132 2000 162.34152920121219.00000 48.198374205.296554 4.6036780.10551100 3.0687139 2.744930810.5 5.00.15 RATE 1.8334520 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.042 0.036 85 2.50 0.035 0 0 0-1 056278.0020121219_760156 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Dec 16, 18:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org