IOTA/IOTA-ES occultation update for (464) Megaira / UCAC2 33690122 event on 2012 Dec 03, 16:11 UT Visible from Africa Summary ------- On 2012 Dec 03 UT, the 79 km diameter asteroid (464) Megaira will occult a 11.8 mag star in the constellation Cetus for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.5 mag to 13.0 mag (the magnitude of the asteroid) for at most 9.5 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: 65 * date and approx. time of event: 2012 Dec 03, 16:01 - 2012 Dec 03, 16:19 UT * geocentric midpoint of event [JD]: 2456265.1745125 * magnitude of target star: 11.8 * magnitude drop [mag]: 1.5 * estimated maximum duration [s]: 9.5 * Moon: 79 % sunlit, 79° distance * Sun: 153° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 102 * 1 sigma uncertainty interval [path widths]: +/- 0.93 * 1 sigma uncertainty interval [seconds]: +/- 8.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .068 +/- .068) * 1 sigma uncertainty ellipse (major, minor, PA): ( .068", .068", 359° ) * approx speed of asteroid's shadow [km/s]: 8.3754 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 33690122 by 464 Megaira on 2012 Dec 3 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 32 0 0 -21 34 2 16 19 16 27 72 0 -21 6 16 -22 1 59 -20 15 6 -22 54 29 33 0 0 -21 40 2 16 19 9 28 71 -1 -21 12 16 -22 8 0 -20 21 4 -23 0 32 34 0 0 -21 46 25 16 19 1 28 71 -2 -21 18 37 -22 14 24 -20 27 24 -23 6 58 35 0 0 -21 53 9 16 18 54 29 70 -2 -21 25 20 -22 21 9 -20 34 5 -23 13 45 36 0 0 -22 0 15 16 18 46 30 69 -3 -21 32 25 -22 28 17 -20 41 8 -23 20 55 37 0 0 -22 7 43 16 18 38 31 69 -4 -21 39 52 -22 35 46 -20 48 32 -23 28 26 38 0 0 -22 15 32 16 18 30 32 68 -5 -21 47 39 -22 43 36 -20 56 17 -23 36 19 39 0 0 -22 23 42 16 18 22 32 67 -5 -21 55 48 -22 51 48 -21 4 24 -23 44 34 40 0 0 -22 32 14 16 18 14 33 67 -6 -22 4 18 -23 0 21 -21 12 51 -23 53 9 41 0 0 -22 41 6 16 18 5 34 66 -7 -22 13 9 -23 9 14 -21 21 39 -24 2 6 42 0 0 -22 50 19 16 17 56 35 65 -8 -22 22 20 -23 18 29 -21 30 47 -24 11 24 43 0 0 -22 59 52 16 17 47 35 65 -8 -22 31 52 -23 28 4 -21 40 16 -24 21 2 44 0 0 -23 9 46 16 17 38 36 64 -9 -22 41 44 -23 37 59 -21 50 5 -24 31 1 45 0 0 -23 19 59 16 17 29 37 63 -10 -22 51 56 -23 48 15 -22 0 13 -24 41 20 46 0 0 -23 30 33 16 17 20 37 62 -10 -23 2 27 -23 58 50 -22 10 42 -24 51 59 47 0 0 -23 41 26 16 17 10 38 61 -11 -23 13 19 -24 9 45 -22 21 29 -25 2 58 48 0 0 -23 52 39 16 17 1 39 61 -12 -23 24 29 -24 21 0 -22 32 36 -25 14 16 49 0 0 -24 4 10 16 16 51 39 60 -12 -23 35 59 -24 32 34 -22 44 2 -25 25 54 50 0 0 -24 16 1 16 16 41 40 59 -13 -23 47 47 -24 44 26 -22 55 47 -25 37 51 51 0 0 -24 28 10 16 16 31 41 58 -14 -23 59 54 -24 56 38 -23 7 50 -25 50 6 52 0 0 -24 40 38 16 16 21 41 57 -14 -24 12 20 -25 9 8 -23 20 12 -26 2 41 53 0 0 -24 53 24 16 16 11 42 56 -15 -24 25 3 -25 21 56 -23 32 51 -26 15 33 54 0 0 -25 6 27 16 16 0 43 55 -15 -24 38 5 -25 35 2 -23 45 48 -26 28 44 55 0 0 -25 19 49 16 15 50 43 54 -16 -24 51 24 -25 48 25 -23 59 3 -26 42 12 56 0 0 -25 33 27 16 15 39 44 53 -17 -25 5 0 -26 2 7 -24 12 35 -26 55 58 57 0 0 -25 47 23 16 15 28 44 52 -17 -25 18 53 -26 16 5 -24 26 24 -27 10 1 58 0 0 -26 1 35 16 15 18 45 51 -18 -25 33 3 -26 30 20 -24 40 30 -27 24 21 59 0 0 -26 16 5 16 15 7 45 49 -18 -25 47 30 -26 44 51 -24 54 52 -27 38 57 60 0 0 -26 30 50 16 14 56 46 48 -19 -26 2 12 -26 59 39 -25 9 30 -27 53 50 61 0 0 -26 45 51 16 14 45 46 47 -19 -26 17 11 -27 14 43 -25 24 24 -28 8 59 62 0 0 -27 1 7 16 14 34 47 46 -20 -26 32 25 -27 30 2 -25 39 33 -28 24 23 63 0 0 -27 16 39 16 14 23 47 45 -20 -26 47 54 -27 45 37 -25 54 58 -28 40 3 64 0 0 -27 32 26 16 14 11 47 43 -21 -27 3 38 -28 1 26 -26 10 37 -28 55 58 65 0 0 -27 48 27 16 14 0 48 42 -21 -27 19 37 -28 17 30 -26 26 31 -29 12 7 66 0 0 -28 4 43 16 13 49 48 41 -22 -27 35 50 -28 33 49 -26 42 39 -29 28 31 67 0 0 -28 21 13 16 13 37 49 39 -22 -27 52 17 -28 50 21 -26 59 1 -29 45 8 68 0 0 -28 37 56 16 13 26 49 38 -23 -28 8 57 -29 7 7 -27 15 36 -30 1 59 69 0 0 -28 54 52 16 13 14 49 36 -23 -28 25 51 -29 24 6 -27 32 25 -30 19 4 70 0 0 -29 12 1 16 13 3 49 35 -23 -28 42 57 -29 41 18 -27 49 26 -30 36 21 71 0 0 -29 29 22 16 12 51 50 33 -24 -29 0 16 -29 58 42 -28 6 40 -30 53 51 72 0 0 -29 46 56 16 12 40 50 32 -24 -29 17 46 -30 16 18 -28 24 6 -31 11 33 73 0 0 -30 4 41 16 12 28 50 30 -24 -29 35 29 -30 34 6 -28 41 43 -31 29 26 74 0 0 -30 22 38 16 12 17 50 29 -25 -29 53 23 -30 52 6 -28 59 32 -31 47 31 75 0 0 -30 40 45 16 12 5 50 27 -25 -30 11 27 -31 10 16 -29 17 32 -32 5 46 76 0 0 -30 59 3 16 11 54 50 26 -25 -30 29 43 -31 28 37 -29 35 42 -32 24 13 77 0 0 -31 17 31 16 11 42 50 24 -26 -30 48 8 -31 47 7 -29 54 3 -32 42 49 78 0 0 -31 36 9 16 11 31 50 23 -26 -31 6 43 -32 5 48 -30 12 33 -33 1 34 79 0 0 -31 54 56 16 11 19 50 21 -26 -31 25 27 -32 24 38 -30 31 12 -33 20 29 80 0 0 -32 13 51 16 11 8 50 20 -26 -31 44 20 -32 43 36 -30 50 0 -33 39 33 81 0 0 -32 32 55 16 10 56 50 18 -27 -32 3 22 -33 2 43 -31 8 57 -33 58 45 82 0 0 -32 52 8 16 10 45 50 17 -27 -32 22 31 -33 21 58 -31 28 2 -34 18 5 83 0 0 -33 11 27 16 10 33 50 15 -27 -32 41 48 -33 41 20 -31 47 14 -34 37 32 84 0 0 -33 30 54 16 10 22 50 14 -27 -33 1 12 -34 0 49 -32 6 34 -34 57 7 85 0 0 -33 50 27 16 10 10 50 12 -27 -33 20 43 -34 20 25 -32 26 1 -35 16 47 86 0 0 -34 10 7 16 9 59 50 10 -27 -33 40 20 -34 40 7 -32 45 33 -35 36 34 87 0 0 -34 29 52 16 9 48 50 9 -27 -34 0 3 -34 59 55 -33 5 12 -35 56 27 88 0 0 -34 49 43 16 9 37 49 7 -28 -34 19 52 -35 19 48 -33 24 56 -36 16 24 89 0 0 -35 9 38 16 9 26 49 6 -28 -34 39 45 -35 39 46 -33 44 45 -36 36 27 90 0 0 -35 29 38 16 9 15 49 4 -28 -34 59 42 -35 59 48 -34 4 38 -36 56 33 91 0 0 -35 49 41 16 9 4 49 3 -28 -35 19 44 -36 19 53 -34 24 36 -37 16 43 92 0 0 -36 9 49 16 8 53 48 2 -28 -35 39 49 -36 40 3 -34 44 37 -37 36 57 93 0 0 -36 29 59 16 8 42 48 0 -28 -35 59 57 -37 0 15 -35 4 41 -37 57 13 94 0 0 -36 50 11 16 8 31 48 359 -28 -36 20 7 -37 20 29 -35 24 48 -38 17 31 95 0 0 -37 10 26 16 8 21 47 357 -28 -36 40 20 -37 40 46 -35 44 58 -38 37 51 96 0 0 -37 30 42 16 8 10 47 356 -28 -37 0 34 -38 1 4 -36 5 9 -38 58 13 97 0 0 -37 50 59 16 8 0 46 355 -28 -37 20 49 -38 21 23 -36 25 21 -39 18 35 98 0 0 -38 11 17 16 7 50 46 353 -28 -37 41 6 -38 41 42 -36 45 34 -39 38 58 99 0 0 -38 31 35 16 7 39 46 352 -27 -38 1 22 -39 2 2 -37 5 48 -39 59 21 100 0 0 -38 51 52 16 7 29 45 351 -27 -38 21 38 -39 22 21 -37 26 1 -40 19 43 101 0 0 -39 12 9 16 7 19 45 349 -27 -38 41 54 -39 42 39 -37 46 14 -40 40 4 102 0 0 -39 32 25 16 7 9 44 348 -27 -39 2 8 -40 2 56 -38 6 26 -41 0 23 103 0 0 -39 52 38 16 7 0 44 347 -27 -39 22 20 -40 23 11 -38 26 36 -41 20 41 104 0 0 -40 12 50 16 6 50 43 346 -27 -39 42 31 -40 43 24 -38 46 45 -41 40 56 105 0 0 -40 32 59 16 6 41 43 344 -27 -40 2 39 -41 3 34 -39 6 51 -42 1 8 106 0 0 -40 53 5 16 6 31 42 343 -26 -40 22 44 -41 23 41 -39 26 55 -42 21 17 107 0 0 -41 13 8 16 6 22 42 342 -26 -40 42 46 -41 43 44 -39 46 55 -42 41 21 108 0 0 -41 33 6 16 6 13 41 341 -26 -41 2 44 -42 3 44 -40 6 52 -43 1 22 109 0 0 -41 53 1 16 6 4 41 340 -26 -41 22 37 -42 23 38 -40 26 44 -43 21 18 110 0 0 -42 12 50 16 5 55 40 339 -25 -41 42 26 -42 43 28 -40 46 32 -43 41 9 111 0 0 -42 32 34 16 5 47 39 338 -25 -42 2 10 -43 3 13 -41 6 16 -44 0 54 112 0 0 -42 52 13 16 5 38 39 336 -25 -42 21 48 -43 22 52 -41 25 53 -44 20 33 113 0 0 -43 11 45 16 5 30 38 335 -25 -42 41 21 -43 42 24 -41 45 25 -44 40 6 114 0 0 -43 31 11 16 5 22 38 334 -24 -43 0 47 -44 1 50 -42 4 51 -44 59 32 115 0 0 -43 50 30 16 5 14 37 333 -24 -43 20 6 -44 21 9 -42 24 11 -45 18 51 116 0 0 -44 9 42 16 5 6 37 332 -24 -43 39 18 -44 40 21 -42 43 23 -45 38 3 117 0 0 -44 28 47 16 4 58 36 331 -23 -43 58 23 -44 59 25 -43 2 28 -45 57 6 118 0 0 -44 47 43 16 4 50 35 330 -23 -44 17 20 -45 18 21 -43 21 26 -46 16 1 119 0 0 -45 6 31 16 4 43 35 329 -23 -44 36 8 -45 37 9 -43 40 15 -46 34 48 120 0 0 -45 25 10 16 4 35 34 328 -22 -44 54 48 -45 55 47 -43 58 56 -46 53 25 121 0 0 -45 43 41 16 4 28 33 327 -22 -45 13 19 -46 14 17 -44 17 29 -47 11 53 122 0 0 -46 2 2 16 4 21 33 326 -22 -45 31 41 -46 32 37 -44 35 52 -47 30 11 123 0 0 -46 20 13 16 4 14 32 325 -21 -45 49 53 -46 50 47 -44 54 6 -47 48 20 124 0 0 -46 38 14 16 4 8 32 324 -21 -46 7 56 -47 8 48 -45 12 10 -48 6 18 125 0 0 -46 56 5 16 4 1 31 324 -21 -46 25 48 -47 26 37 -45 30 5 -48 24 5 126 0 0 -47 13 46 16 3 55 30 323 -20 -46 43 30 -47 44 17 -45 47 49 -48 41 42 127 0 0 -47 31 16 16 3 49 30 322 -20 -47 1 1 -48 1 45 -46 5 22 -48 59 8 128 0 0 -47 48 34 16 3 43 29 321 -19 -47 18 21 -48 19 2 -46 22 45 -49 16 22 129 0 0 -48 5 41 16 3 37 28 320 -19 -47 35 30 -48 36 7 -46 39 57 -49 33 24 130 0 0 -48 22 37 16 3 31 28 319 -19 -47 52 27 -48 53 1 -46 56 57 -49 50 15 131 0 0 -48 39 20 16 3 25 27 318 -18 -48 9 12 -49 9 43 -47 13 45 -50 6 53 132 0 0 -48 55 52 16 3 20 26 317 -18 -48 25 46 -49 26 13 -47 30 22 -50 23 19 133 0 0 -49 12 11 16 3 15 26 316 -17 -48 42 7 -49 42 30 -47 46 47 -50 39 32 134 0 0 -49 28 18 16 3 10 25 315 -17 -48 58 16 -49 58 35 -48 3 0 -50 55 33 135 0 0 -49 44 12 16 3 5 25 315 -16 -49 14 12 -50 14 27 -48 19 0 -51 11 21 136 0 0 -49 59 54 16 3 0 24 314 -16 -49 29 55 -50 30 6 -48 34 47 -51 26 56 137 0 0 -50 15 22 16 2 55 23 313 -16 -49 45 26 -50 45 32 -48 50 21 -51 42 17 138 0 0 -50 30 37 16 2 50 23 312 -15 -50 0 43 -51 0 44 -49 5 43 -51 57 25 139 0 0 -50 45 38 16 2 46 22 311 -15 -50 15 47 -51 15 43 -49 20 51 -52 12 19 140 0 0 -51 0 27 16 2 42 21 310 -14 -50 30 38 -51 30 29 -49 35 46 -52 27 0 141 0 0 -51 15 1 16 2 38 21 309 -14 -50 45 15 -51 45 1 -49 50 28 -52 41 27 142 0 0 -51 29 22 16 2 34 20 309 -13 -50 59 38 -51 59 19 -50 4 56 -52 55 40 143 0 0 -51 43 29 16 2 30 19 308 -13 -51 13 48 -52 13 23 -50 19 10 -53 9 39 144 0 0 -51 57 21 16 2 26 19 307 -12 -51 27 43 -52 27 13 -50 33 10 -53 23 24 145 0 0 -52 11 0 16 2 23 18 306 -12 -51 41 25 -52 40 49 -50 46 57 -53 36 54 146 0 0 -52 24 25 16 2 19 18 305 -11 -51 54 52 -52 54 11 -51 0 29 -53 50 10 147 0 0 -52 37 35 16 2 16 17 304 -11 -52 8 5 -53 7 18 -51 13 47 -54 3 12 148 0 0 -52 50 31 16 2 13 16 304 -10 -52 21 4 -53 20 11 -51 26 51 -54 16 0 149 0 0 -53 3 13 16 2 10 16 303 -10 -52 33 48 -53 32 50 -51 39 41 -54 28 33 150 0 0 -53 15 40 16 2 7 15 302 -9 -52 46 18 -53 45 14 -51 52 16 -54 40 51 151 0 0 -53 27 52 16 2 4 15 301 -9 -52 58 34 -53 57 24 -52 4 37 -54 52 55 152 0 0 -53 39 50 16 2 2 14 300 -8 -53 10 35 -54 9 19 -52 16 43 -55 4 44 153 0 0 -53 51 34 16 1 59 13 300 -8 -53 22 21 -54 20 59 -52 28 35 -55 16 19 154 0 0 -54 3 3 16 1 57 13 299 -8 -53 33 53 -54 32 25 -52 40 12 -55 27 39 155 0 0 -54 14 17 16 1 54 12 298 -7 -53 45 10 -54 43 36 -52 51 34 -55 38 44 156 0 0 -54 25 17 16 1 52 12 297 -7 -53 56 13 -54 54 33 -53 2 42 -55 49 35 157 0 0 -54 36 1 16 1 50 11 296 -6 -54 7 1 -55 5 15 -53 13 36 -56 0 11 158 0 0 -54 46 32 16 1 48 10 295 -6 -54 17 34 -55 15 42 -53 24 14 -56 10 32 159 0 0 -54 56 47 16 1 47 10 295 -5 -54 27 52 -55 25 54 -53 34 38 -56 20 39 160 0 0 -55 6 48 16 1 45 9 294 -5 -54 37 56 -55 35 52 -53 44 47 -56 30 31 161 0 0 -55 16 34 16 1 43 9 293 -4 -54 47 45 -55 45 35 -53 54 41 -56 40 8 162 0 0 -55 26 5 16 1 42 8 292 -4 -54 57 19 -55 55 4 -54 4 21 -56 49 31 163 0 0 -55 35 22 16 1 41 7 291 -3 -55 6 39 -56 4 17 -54 13 45 -56 58 39 164 0 0 -55 44 24 16 1 39 7 290 -3 -55 15 44 -56 13 16 -54 22 56 -57 7 33 165 0 0 -55 53 11 16 1 38 6 290 -2 -55 24 34 -56 22 1 -54 31 51 -57 16 11 166 0 0 -56 1 44 16 1 37 6 289 -2 -55 33 9 -56 30 31 -54 40 31 -57 24 36 167 0 0 -56 10 2 16 1 36 5 288 -1 -55 41 30 -56 38 46 -54 48 57 -57 32 46 168 0 0 -56 18 6 16 1 35 5 287 -1 -55 49 37 -56 46 47 -54 57 8 -57 40 41 169 0 0 -56 25 54 16 1 35 4 286 0 -55 57 28 -56 54 33 -55 5 5 -57 48 22 Uncertainty in time = +/- 9 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: UCAC2 33690122 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 11 47.4198 DE: +05 34 50.385 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .063, .067 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (464) Megaira approx. diameter [km]: 79 approx. diameter ["]: .073 distance from Earth [AU]: 1.49000 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 952 number of rejected observations: 85 time covered by the observations: 1901 Jan 09 - 2012 Nov 29 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.013, 69° remarks: * orbital elements for (464) Megaira : Mean anomaly = 37.71314343 deg Arg. of pericenter = 258.93200614 deg Long. of node = 102.38947414 deg Inclination = 10.16411243 deg Eccentricity = 0.20316511 Semimajor axis = 2.80443695 AU Perihelion dist = 2.23467320 AU Mag: H = 9.64, G = 0.15 Epoch of elements : MJD 56264.67500000 TDT (2012 Dec 03.675) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 3 464 Megaira 16h 11.3m UT 11.8 3 11 47.420 5 34 50.39UCAC2 33690122 0.0 13.0 79 9.5 1.490 -1.777 8.60 92.2312 5.577 -65.31 -22.21 16.1883 -0.19556 -0.60462 -4.49756 1.45575 0.00200 0.00168 2000 36.73203420121129.00000258.932006102.389474 10.1641120.20316511 2.8044370 2.2346732 9.5 5.00.15 RATE 2.0986290 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.068 0.068 359 1.93 0.068 0 0-2-5 056264.0020121203_690122 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 22:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org