IOTA/IOTA-ES occultation update for (3250) Martebo / TYC 5692-02258-1 event on 2012 Jul 20, 17:28 UT Visible from SE Asia,India, Africa Summary ------- On 2012 Jul 20 UT, the 20 km diameter asteroid (3250) Martebo will occult a 10.0 mag star in the constellation Scutum for observers along a path across SE Asia,India, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.7 mag to 15.7 mag (the magnitude of the asteroid) for at most 1.8 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: 17 * date and approx. time of event: 2012 Jul 20, 17:18 - 2012 Jul 20, 17:36 UT * geocentric midpoint of event [JD]: 2456129.2276 * magnitude of target star: 10.0 * magnitude drop [mag]: 5.7 * estimated maximum duration [s]: 1.8 * Moon: 3 % sunlit, 144° distance * Sun: 158° distance * rough path description: SE Asia,India, Africa The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 3.95 * 1 sigma uncertainty interval [seconds]: +/- 8.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .068 +/- .052) * 1 sigma uncertainty ellipse (major, minor, PA): ( .068", .051", 83° ) * approx speed of asteroid's shadow [km/s]: 11.3275 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5692-02258-1 by 3250 Martebo on 2012 Jul 20 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 10 0 0 4 16 31 17 36 6 20 101 -1 4 22 14 4 10 49 5 7 27 3 25 50 11 0 0 4 11 57 17 36 2 21 101 -2 4 17 39 4 6 14 5 2 51 3 21 17 12 0 0 4 7 37 17 35 58 22 101 -3 4 13 19 4 1 55 4 58 30 3 16 58 13 0 0 4 3 32 17 35 55 23 102 -4 4 9 14 3 57 50 4 54 24 3 12 54 14 0 0 3 59 42 17 35 50 24 102 -5 4 5 24 3 54 0 4 50 33 3 9 5 15 0 0 3 56 7 17 35 46 25 102 -5 4 1 49 3 50 25 4 46 57 3 5 31 16 0 0 3 52 47 17 35 42 26 102 -6 3 58 29 3 47 5 4 43 36 3 2 12 17 0 0 3 49 42 17 35 37 27 102 -7 3 55 24 3 44 1 4 40 31 2 59 8 18 0 0 3 46 52 17 35 33 28 102 -8 3 52 34 3 41 11 4 37 40 2 56 19 19 0 0 3 44 18 17 35 28 29 102 -9 3 49 59 3 38 36 4 35 5 2 53 45 20 0 0 3 41 58 17 35 23 30 103 -10 3 47 40 3 36 17 4 32 44 2 51 26 21 0 0 3 39 54 17 35 18 31 103 -11 3 45 35 3 34 12 4 30 39 2 49 22 22 0 0 3 38 4 17 35 13 32 103 -12 3 43 46 3 32 23 4 28 49 2 47 33 23 0 0 3 36 30 17 35 7 33 103 -13 3 42 11 3 30 48 4 27 14 2 45 59 24 0 0 3 35 10 17 35 2 34 103 -14 3 40 52 3 29 29 4 25 55 2 44 40 25 0 0 3 34 6 17 34 56 35 103 -15 3 39 48 3 28 25 4 24 50 2 43 36 26 0 0 3 33 17 17 34 50 36 104 -16 3 38 58 3 27 36 4 24 1 2 42 47 27 0 0 3 32 43 17 34 44 37 104 -17 3 38 24 3 27 2 4 23 26 2 42 14 28 0 0 3 32 24 17 34 38 38 104 -17 3 38 5 3 26 43 4 23 7 2 41 55 29 0 0 3 32 20 17 34 32 39 104 -18 3 38 1 3 26 39 4 23 3 2 41 51 30 0 0 3 32 31 17 34 26 39 105 -19 3 38 12 3 26 50 4 23 14 2 42 2 31 0 0 3 32 57 17 34 19 40 105 -20 3 38 38 3 27 16 4 23 40 2 42 28 32 0 0 3 33 38 17 34 13 41 105 -21 3 39 19 3 27 57 4 24 21 2 43 9 33 0 0 3 34 34 17 34 6 42 105 -22 3 40 15 3 28 53 4 25 17 2 44 5 34 0 0 3 35 44 17 33 59 43 106 -23 3 41 26 3 30 3 4 26 28 2 45 15 35 0 0 3 37 10 17 33 53 44 106 -24 3 42 51 3 31 29 4 27 53 2 46 40 36 0 0 3 38 50 17 33 46 45 106 -24 3 44 32 3 33 9 4 29 34 2 48 21 37 0 0 3 40 45 17 33 38 46 107 -25 3 46 27 3 35 4 4 31 29 2 50 15 38 0 0 3 42 55 17 33 31 47 107 -26 3 48 36 3 37 14 4 33 39 2 52 25 39 0 0 3 45 19 17 33 24 48 108 -27 3 51 1 3 39 38 4 36 4 2 54 49 40 0 0 3 47 58 17 33 16 49 108 -28 3 53 40 3 42 17 4 38 44 2 57 27 41 0 0 3 50 52 17 33 9 50 109 -29 3 56 33 3 45 11 4 41 38 3 0 20 42 0 0 3 54 0 17 33 1 50 109 -30 3 59 42 3 48 19 4 44 46 3 3 28 43 0 0 3 57 22 17 32 54 51 110 -30 4 3 4 3 51 41 4 48 9 3 6 49 44 0 0 4 0 59 17 32 46 52 110 -31 4 6 41 3 55 18 4 51 47 3 10 25 45 0 0 4 4 50 17 32 38 53 111 -32 4 10 32 3 59 9 4 55 38 3 14 16 46 0 0 4 8 55 17 32 30 54 111 -33 4 14 37 4 3 14 4 59 44 3 18 20 47 0 0 4 13 15 17 32 22 55 112 -34 4 18 57 4 7 33 5 4 5 3 22 39 48 0 0 4 17 48 17 32 14 56 113 -35 4 23 30 4 12 6 5 8 39 3 27 11 49 0 0 4 22 35 17 32 5 57 113 -35 4 28 18 4 16 53 5 13 27 3 31 58 50 0 0 4 27 37 17 31 57 57 114 -36 4 33 19 4 21 55 5 18 29 3 36 58 51 0 0 4 32 52 17 31 49 58 115 -37 4 38 34 4 27 9 5 23 45 3 42 12 52 0 0 4 38 20 17 31 40 59 116 -38 4 44 3 4 32 38 5 29 15 3 47 40 53 0 0 4 44 3 17 31 31 60 117 -39 4 49 45 4 38 20 5 34 58 3 53 21 54 0 0 4 49 59 17 31 23 61 118 -39 4 55 41 4 44 16 5 40 55 3 59 16 55 0 0 4 56 8 17 31 14 62 119 -40 5 1 51 4 50 25 5 47 6 4 5 24 56 0 0 5 2 30 17 31 5 62 120 -41 5 8 13 4 56 47 5 53 30 4 11 45 57 0 0 5 9 6 17 30 57 63 121 -42 5 14 49 5 3 23 6 0 6 4 18 20 58 0 0 5 15 55 17 30 48 64 123 -42 5 21 38 5 10 12 6 6 57 4 25 7 59 0 0 5 22 57 17 30 39 65 124 -43 5 28 40 5 17 13 6 14 0 4 32 8 60 0 0 5 30 11 17 30 30 65 126 -44 5 35 55 5 24 28 6 21 16 4 39 21 61 0 0 5 37 39 17 30 21 66 127 -44 5 43 22 5 31 55 6 28 44 4 46 47 62 0 0 5 45 19 17 30 12 67 129 -45 5 51 2 5 39 35 6 36 26 4 54 26 63 0 0 5 53 11 17 30 2 67 131 -46 5 58 55 5 47 27 6 44 20 5 2 17 64 0 0 6 1 16 17 29 53 68 132 -47 6 7 0 5 55 32 6 52 26 5 10 20 65 0 0 6 9 33 17 29 44 69 134 -47 6 15 17 6 3 49 7 0 44 5 18 36 66 0 0 6 18 2 17 29 35 69 137 -48 6 23 47 6 12 18 7 9 15 5 27 3 67 0 0 6 26 43 17 29 25 70 139 -48 6 32 28 6 20 58 7 17 58 5 35 43 68 0 0 6 35 36 17 29 16 70 141 -49 6 41 21 6 29 51 7 26 52 5 44 34 69 0 0 6 44 40 17 29 7 71 144 -50 6 50 25 6 38 55 7 35 58 5 53 37 70 0 0 6 53 56 17 28 57 71 146 -50 6 59 42 6 48 11 7 45 16 6 2 51 71 0 0 7 3 24 17 28 48 71 149 -51 7 9 9 6 57 38 7 54 45 6 12 17 72 0 0 7 13 2 17 28 38 72 152 -51 7 18 48 7 7 17 8 4 25 6 21 54 73 0 0 7 22 52 17 28 29 72 155 -52 7 28 38 7 17 6 8 14 16 6 31 42 74 0 0 7 32 52 17 28 19 72 158 -52 7 38 38 7 27 6 8 24 18 6 41 41 75 0 0 7 43 3 17 28 10 72 161 -53 7 48 50 7 37 17 8 34 31 6 51 50 76 0 0 7 53 25 17 28 0 73 164 -53 7 59 11 7 47 39 8 44 54 7 2 10 77 0 0 8 3 57 17 27 51 73 167 -54 8 9 44 7 58 11 8 55 28 7 12 41 78 0 0 8 14 39 17 27 41 73 171 -54 8 20 26 8 8 53 9 6 12 7 23 21 79 0 0 8 25 31 17 27 32 73 174 -55 8 31 18 8 19 45 9 17 6 7 34 12 80 0 0 8 36 33 17 27 22 72 177 -55 8 42 21 8 30 47 9 28 9 7 45 12 81 0 0 8 47 45 17 27 13 72 180 -55 8 53 32 8 41 58 9 39 23 7 56 22 82 0 0 8 59 6 17 27 3 72 183 -56 9 4 54 8 53 19 9 50 45 8 7 42 83 0 0 9 10 36 17 26 54 72 186 -56 9 16 24 9 4 49 10 2 17 8 19 10 84 0 0 9 22 16 17 26 45 72 189 -56 9 28 3 9 16 28 10 13 58 8 30 48 85 0 0 9 34 4 17 26 35 71 192 -57 9 39 52 9 28 16 10 25 48 8 42 34 86 0 0 9 46 0 17 26 26 71 195 -57 9 51 49 9 40 12 10 37 46 8 54 30 87 0 0 9 58 6 17 26 16 70 197 -57 10 3 54 9 52 17 10 49 53 9 6 33 88 0 0 10 10 19 17 26 7 70 200 -57 10 16 8 10 4 31 11 2 8 9 18 45 89 0 0 10 22 40 17 25 58 69 202 -57 10 28 29 10 16 52 11 14 31 9 31 5 90 0 0 10 35 10 17 25 48 69 204 -57 10 40 58 10 29 21 11 27 2 9 43 32 91 0 0 10 47 46 17 25 39 68 206 -57 10 53 35 10 41 57 11 39 40 9 56 7 92 0 0 11 0 30 17 25 30 67 208 -58 11 6 19 10 54 41 11 52 25 10 8 50 93 0 0 11 13 21 17 25 21 67 210 -58 11 19 11 11 7 32 12 5 18 10 21 40 94 0 0 11 26 19 17 25 11 66 212 -58 11 32 9 11 20 30 12 18 18 10 34 36 95 0 0 11 39 24 17 25 2 65 214 -57 11 45 14 11 33 34 12 31 24 10 47 39 96 0 0 11 52 35 17 24 53 65 215 -57 11 58 25 11 46 45 12 44 36 11 0 49 97 0 0 12 5 52 17 24 44 64 217 -57 12 11 42 12 0 2 12 57 55 11 14 5 98 0 0 12 19 15 17 24 35 63 218 -57 12 25 5 12 13 25 13 11 19 11 27 26 99 0 0 12 32 44 17 24 27 63 220 -57 12 38 34 12 26 54 13 24 49 11 40 54 100 0 0 12 46 18 17 24 18 62 221 -57 12 52 9 12 40 28 13 38 25 11 54 27 101 0 0 12 59 57 17 24 9 61 222 -57 13 5 48 12 54 7 13 52 5 12 8 5 102 0 0 13 13 42 17 24 0 60 223 -56 13 19 32 13 7 51 14 5 51 12 21 48 103 0 0 13 27 31 17 23 52 59 224 -56 13 33 21 13 21 40 14 19 41 12 35 35 104 0 0 13 41 24 17 23 43 58 226 -56 13 47 15 13 35 33 14 33 35 12 49 28 105 0 0 13 55 21 17 23 35 58 227 -55 14 1 13 13 49 30 14 47 34 13 3 24 106 0 0 14 9 23 17 23 27 57 228 -55 14 15 14 14 3 32 15 1 36 13 17 24 107 0 0 14 23 28 17 23 18 56 228 -55 14 29 19 14 17 37 15 15 42 13 31 28 108 0 0 14 37 36 17 23 10 55 229 -54 14 43 28 14 31 45 15 29 52 13 45 36 109 0 0 14 51 48 17 23 2 54 230 -54 14 57 39 14 45 56 15 44 4 13 59 46 110 0 0 15 6 2 17 22 54 53 231 -53 15 11 54 15 0 10 15 58 19 14 14 0 111 0 0 15 20 19 17 22 46 52 232 -53 15 26 11 15 14 27 16 12 37 14 28 16 112 0 0 15 34 38 17 22 38 52 232 -52 15 40 30 15 28 46 16 26 57 14 42 34 113 0 0 15 48 59 17 22 31 51 233 -52 15 54 51 15 43 7 16 41 19 14 56 55 114 0 0 16 3 22 17 22 23 50 234 -51 16 9 14 15 57 30 16 55 42 15 11 17 115 0 0 16 17 47 17 22 15 49 235 -51 16 23 39 16 11 55 17 10 8 15 25 41 116 0 0 16 32 12 17 22 8 48 235 -50 16 38 4 16 26 20 17 24 34 15 40 6 117 0 0 16 46 39 17 22 1 47 236 -50 16 52 31 16 40 47 17 39 1 15 54 32 118 0 0 17 1 6 17 21 54 46 236 -49 17 6 58 16 55 14 17 53 28 16 8 59 119 0 0 17 15 34 17 21 47 45 237 -48 17 21 26 17 9 41 18 7 56 16 23 26 120 0 0 17 30 1 17 21 40 44 238 -48 17 35 54 17 24 9 18 22 24 16 37 54 121 0 0 17 44 29 17 21 33 43 238 -47 17 50 21 17 38 37 18 36 52 16 52 21 122 0 0 17 58 56 17 21 26 43 239 -47 18 4 48 17 53 4 18 51 19 17 6 48 123 0 0 18 13 22 17 21 19 42 239 -46 18 19 15 18 7 30 19 5 46 17 21 14 124 0 0 18 27 48 17 21 13 41 240 -45 18 33 40 18 21 55 19 20 11 17 35 39 125 0 0 18 42 12 17 21 7 40 240 -45 18 48 4 18 36 20 19 34 36 17 50 4 126 0 0 18 56 34 17 21 0 39 241 -44 19 2 27 18 50 42 19 48 58 18 4 26 127 0 0 19 10 55 17 20 54 38 241 -43 19 16 48 19 5 3 20 3 19 18 18 47 128 0 0 19 25 14 17 20 48 37 242 -42 19 31 6 19 19 22 20 17 37 18 33 6 129 0 0 19 39 30 17 20 43 36 242 -42 19 45 22 19 33 38 20 31 53 18 47 22 130 0 0 19 53 44 17 20 37 35 243 -41 19 59 36 19 47 52 20 46 7 19 1 36 131 0 0 20 7 55 17 20 31 34 243 -40 20 13 47 20 2 3 21 0 17 19 15 48 132 0 0 20 22 2 17 20 26 33 244 -39 20 27 55 20 16 10 21 14 24 19 29 56 133 0 0 20 36 6 17 20 21 32 244 -39 20 41 59 20 30 14 21 28 28 19 44 0 134 0 0 20 50 7 17 20 15 32 245 -38 20 55 59 20 44 15 21 42 28 19 58 2 135 0 0 21 4 4 17 20 10 31 245 -37 21 9 56 20 58 12 21 56 24 20 11 59 136 0 0 21 17 56 17 20 6 30 246 -36 21 23 48 21 12 4 22 10 16 20 25 52 137 0 0 21 31 44 17 20 1 29 246 -36 21 37 36 21 25 52 22 24 3 20 39 40 138 0 0 21 45 27 17 19 56 28 247 -35 21 51 19 21 39 36 22 37 45 20 53 24 139 0 0 21 59 5 17 19 52 27 247 -34 22 4 57 21 53 14 22 51 23 21 7 4 140 0 0 22 12 38 17 19 47 26 247 -33 22 18 30 22 6 47 23 4 55 21 20 37 141 0 0 22 26 6 17 19 43 25 248 -33 22 31 58 22 20 15 23 18 22 21 34 6 142 0 0 22 39 28 17 19 39 24 248 -32 22 45 19 22 33 37 23 31 42 21 47 29 143 0 0 22 52 44 17 19 36 23 249 -31 22 58 35 22 46 53 23 44 57 22 0 46 144 0 0 23 5 54 17 19 32 22 249 -30 23 11 45 23 0 3 23 58 6 22 13 57 145 0 0 23 18 57 17 19 28 21 250 -29 23 24 48 23 13 6 24 11 8 22 27 1 146 0 0 23 31 54 17 19 25 20 250 -28 23 37 45 23 26 3 24 24 4 22 39 59 147 0 0 23 44 44 17 19 22 19 250 -28 23 50 34 23 38 53 24 36 52 22 52 50 148 0 0 23 57 26 17 19 18 19 251 -27 24 3 17 23 51 36 24 49 34 23 5 34 149 0 0 24 10 2 17 19 16 18 251 -26 24 15 52 24 4 12 25 2 8 23 18 11 150 0 0 24 22 30 17 19 13 17 252 -25 24 28 20 24 16 40 25 14 34 23 30 41 151 0 0 24 34 50 17 19 10 16 252 -24 24 40 40 24 29 0 25 26 53 23 43 2 152 0 0 24 47 2 17 19 8 15 253 -24 24 52 52 24 41 12 25 39 4 23 55 16 153 0 0 24 59 6 17 19 5 14 253 -23 25 4 56 24 53 17 25 51 6 24 7 21 154 0 0 25 11 2 17 19 3 13 254 -22 25 16 52 25 5 13 26 3 0 24 19 19 155 0 0 25 22 49 17 19 1 12 254 -21 25 28 38 25 17 0 26 14 46 24 31 7 156 0 0 25 34 27 17 18 59 11 254 -20 25 40 17 25 28 38 26 26 23 24 42 47 157 0 0 25 45 57 17 18 57 10 255 -19 25 51 46 25 40 8 26 37 50 24 54 18 158 0 0 25 57 17 17 18 56 9 255 -19 26 3 6 25 51 29 26 49 9 25 5 40 159 0 0 26 8 28 17 18 54 8 256 -18 26 14 17 26 2 40 27 0 18 25 16 53 160 0 0 26 19 30 17 18 53 8 256 -17 26 25 18 26 13 41 27 11 18 25 27 56 161 0 0 26 30 21 17 18 52 7 257 -16 26 36 10 26 24 33 27 22 8 25 38 50 162 0 0 26 41 3 17 18 51 6 257 -15 26 46 52 26 35 16 27 32 48 25 49 34 163 0 0 26 51 35 17 18 50 5 257 -14 26 57 23 26 45 48 27 43 18 26 0 7 164 0 0 27 1 57 17 18 49 4 258 -13 27 7 45 26 56 10 27 53 38 26 10 31 165 0 0 27 12 9 17 18 49 3 258 -13 27 17 56 27 6 21 28 3 48 .. .. .. 166 0 0 27 22 10 17 18 48 2 259 -12 27 27 57 27 16 23 28 13 47 .. .. .. 167 0 0 27 32 0 17 18 48 1 259 -11 27 37 47 27 26 13 28 23 36 .. .. .. 168 0 0 27 41 40 17 18 48 0 260 -10 27 47 26 27 35 53 28 33 13 .. .. .. Uncertainty in time = +/- 9 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: TYC 5692-02258-1 * constellation : Scutum * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 45 53.0175 DE: -08 56 45.553 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .025 ) * V mag [mag]: 10.0 * B mag [mag]: 11.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3250) Martebo approx. diameter [km]: 20 approx. diameter ["]: .013 distance from Earth [AU]: 2.04900 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 949 number of rejected observations: 22 time covered by the observations: 1908 Oct 01 - 2012 Jun 21 1 sigma uncertainty ellipse (major, minor, PA): 0.064, 0.045, 82° remarks: * orbital elements for (3250) Martebo : Mean anomaly = 275.82329023 deg Arg. of pericenter = 178.80609012 deg Long. of node = 204.31673383 deg Inclination = 9.54727402 deg Eccentricity = 0.10105429 Semimajor axis = 3.01742962 AU Perihelion dist = 2.71250542 AU Mag: H = 11.21, G = 0.15 Epoch of elements : MJD 56128.72800000 TDT (2012 Jul 20.728) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Jul 20 3250 Martebo 17h 27.7m UT 10.0 18 45 53.018- 8 56 45.55TYC 5692-02258-1 11.6 15.7 20 1.8 2.049 -1.820 -5.05 80.6387 -8.944 -80.33 20.48 17.4624 -0.05451 0.29311 -6.28440 -1.17649 0.00172 -0.00117 2000 274.1820842012 712.00000178.806090204.316734 9.5472740.10105429 3.0174296 2.712505411.2 5.00.15 RATE 1.8803920 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.068 0.051 83 4.95 0.053 0 0-5-3 056116.0020120720_2258-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 07, 22:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org