IOTA/IOTA-ES occultation update for (1508) Kemi / TYC 3688-00529-1 event on 2012 Nov 19, 21:52 UT Visible from Arabia, SW Asia, Europe, NE Canada Summary ------- On 2012 Nov 19 UT, the 18 km diameter asteroid (1508) Kemi will occult a 10.5 mag star in the constellation Perseus for observers along a path across Arabia, SW Asia, Europe, NE Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.7 mag to 14.2 mag (the magnitude of the asteroid) for at most 1.5 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: 31 * date and approx. time of event: 2012 Nov 19, 21:43 - 2012 Nov 19, 21:59 UT * geocentric midpoint of event [JD]: 2456251.41121667 * magnitude of target star: 10.5 * magnitude drop [mag]: 3.7 * estimated maximum duration [s]: 1.5 * Moon: 43 % sunlit, 87° distance * Sun: 139° distance * rough path description: Arabia, SW Asia, Europe, NE Canada The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 2.12 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .044 +/- .053) * 1 sigma uncertainty ellipse (major, minor, PA): ( .059", .036", 213° ) * approx speed of asteroid's shadow [km/s]: 11.6589 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 3688-00529-1 by 1508 Kemi on 2012 Nov 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 ' " Longitude Longitude Longitude Longitude 74 51 59 -13 0 0 21 43 4 0 328 -36 74 57 50 74 46 8 ... .. .. 74 21 20 74 14 21 -12 0 0 21 43 4 1 328 -37 74 20 10 74 8 32 74 44 52 73 43 51 73 37 1 -11 0 0 21 43 4 3 329 -38 73 42 49 73 31 13 74 7 24 73 6 40 72 59 57 -10 0 0 21 43 5 4 329 -39 73 5 43 72 54 11 73 30 12 72 29 44 72 23 8 - 9 0 0 21 43 6 5 329 -40 72 28 53 72 17 23 72 53 16 71 53 1 71 46 32 - 8 0 0 21 43 7 6 329 -41 71 52 16 71 40 48 72 16 34 71 16 31 71 10 6 - 7 0 0 21 43 8 7 329 -42 71 15 49 71 4 24 71 40 3 70 40 11 70 33 50 - 6 0 0 21 43 9 8 329 -43 70 39 32 70 28 8 71 3 42 70 3 59 69 57 42 - 5 0 0 21 43 11 10 329 -44 70 3 23 69 52 1 70 27 30 69 27 54 69 21 40 - 4 0 0 21 43 13 11 329 -45 69 27 21 69 15 59 69 51 25 68 51 55 68 45 43 - 3 0 0 21 43 15 12 329 -46 68 51 23 68 40 2 69 15 25 68 16 0 68 9 48 - 2 0 0 21 43 17 13 329 -47 68 15 28 68 4 8 68 39 29 67 40 7 67 33 55 - 1 0 0 21 43 20 14 329 -48 67 39 35 67 28 15 68 3 36 67 4 15 66 58 2 0 0 0 21 43 23 15 329 -49 67 3 42 66 52 22 67 27 43 66 28 22 66 22 8 1 0 0 21 43 26 16 329 -50 66 27 48 66 16 28 66 51 49 65 52 26 Latitude Latitude Latitude Latitude 65 0 0 3 16 52 21 43 34 19 329 -53 3 26 18 3 7 26 4 6 19 2 27 24 64 0 0 4 56 19 21 43 40 21 329 -54 5 5 43 4 46 54 5 45 37 4 6 59 63 0 0 6 35 5 21 43 47 23 329 -56 6 44 28 6 25 42 7 24 13 5 45 56 62 0 0 8 13 1 21 43 54 25 329 -57 8 22 21 8 3 41 9 1 57 7 24 4 61 0 0 9 49 57 21 44 2 27 329 -59 9 59 15 9 40 39 10 38 39 9 1 15 60 0 0 11 25 44 21 44 10 28 328 -60 11 34 58 11 16 29 12 14 10 10 37 18 59 0 0 13 0 13 21 44 18 30 328 -62 13 9 24 12 51 2 13 48 21 12 12 5 58 0 0 14 33 17 21 44 27 32 328 -63 14 42 25 14 24 10 15 21 6 13 45 28 57 0 0 16 4 50 21 44 37 34 328 -64 16 13 53 15 55 46 16 52 18 15 17 21 56 0 0 17 34 43 21 44 46 36 327 -65 17 43 43 17 25 44 18 21 50 16 47 37 55 0 0 19 2 54 21 44 56 37 327 -67 19 11 49 18 53 59 19 49 37 18 16 11 54 0 0 20 29 16 21 45 6 39 327 -68 20 38 6 20 20 26 21 15 35 19 42 57 53 0 0 21 53 46 21 45 16 41 326 -68 22 2 32 21 45 1 22 39 40 21 7 52 52 0 0 23 16 21 21 45 27 42 326 -69 23 25 2 23 7 40 24 1 50 22 30 53 51 0 0 24 36 58 21 45 37 44 326 -70 24 45 34 24 28 22 25 22 0 23 51 56 50 0 0 25 55 35 21 45 48 45 325 -70 26 4 6 25 47 5 26 40 11 25 11 1 49 0 0 27 12 12 21 45 58 47 325 -71 27 20 37 27 3 47 27 56 20 26 28 5 48 0 0 28 26 47 21 46 9 49 324 -71 28 35 7 28 18 27 29 10 27 27 43 7 47 0 0 29 39 19 21 46 19 50 324 -71 29 47 34 29 31 5 30 22 31 28 56 8 46 0 0 30 49 50 21 46 30 51 323 -72 30 57 59 30 41 41 31 32 34 30 7 7 45 0 0 31 58 20 21 46 41 53 323 -72 32 6 24 31 50 16 32 40 35 31 16 5 44 0 0 33 4 49 21 46 51 54 322 -71 33 12 47 32 56 51 33 46 36 32 23 3 43 0 0 34 9 19 21 47 2 55 322 -71 34 17 12 34 1 26 34 50 38 33 28 2 42 0 0 35 11 52 21 47 12 57 321 -71 35 19 40 35 4 5 35 52 43 34 31 3 41 0 0 36 12 29 21 47 22 58 320 -71 36 20 11 36 4 47 36 52 52 35 32 8 40 0 0 37 11 12 21 47 32 59 320 -70 37 18 49 37 3 35 37 51 7 36 31 19 39 0 0 38 8 4 21 47 42 60 319 -70 38 15 35 38 0 32 38 47 31 37 28 38 38 0 0 39 3 6 21 47 52 62 318 -69 39 10 32 38 55 40 39 42 6 38 24 7 37 0 0 39 56 21 21 48 2 63 318 -69 40 3 42 39 49 0 40 34 54 39 17 50 36 0 0 40 47 52 21 48 12 64 317 -68 40 55 8 40 40 36 41 25 58 40 9 47 35 0 0 41 37 41 21 48 21 65 316 -68 41 44 52 41 30 30 42 15 20 41 0 2 34 0 0 42 25 50 21 48 31 66 316 -67 42 32 57 42 18 44 43 3 4 41 48 38 33 0 0 43 12 23 21 48 40 67 315 -66 43 19 25 43 5 22 43 49 12 42 35 36 32 0 0 43 57 22 21 48 49 68 314 -66 44 4 19 43 50 25 44 33 45 43 21 0 31 0 0 44 40 49 21 48 58 69 313 -65 44 47 41 44 33 57 45 16 48 44 4 51 30 0 0 45 22 48 21 49 6 70 312 -64 45 29 35 45 16 0 45 58 22 44 47 14 29 0 0 46 3 20 21 49 15 71 312 -64 46 10 3 45 56 37 46 38 31 45 28 10 28 0 0 46 42 28 21 49 23 72 311 -63 46 49 7 46 35 50 47 17 17 46 7 41 27 0 0 47 20 16 21 49 32 73 310 -62 47 26 50 47 13 42 47 54 41 46 45 51 26 0 0 47 56 44 21 49 40 74 309 -62 48 3 14 47 50 14 48 30 48 47 22 41 25 0 0 48 31 56 21 49 48 74 308 -61 48 38 22 48 25 31 49 5 39 47 58 15 24 0 0 49 5 55 21 49 56 75 307 -60 49 12 16 48 59 33 49 39 16 48 32 34 23 0 0 49 38 41 21 50 4 76 306 -60 49 44 59 49 32 23 50 11 42 49 5 41 22 0 0 50 10 18 21 50 11 77 305 -59 50 16 32 50 4 4 50 42 59 49 37 38 21 0 0 50 40 48 21 50 19 78 304 -58 50 46 58 50 34 38 51 13 9 50 8 27 20 0 0 51 10 12 21 50 26 78 303 -58 51 16 19 51 4 6 51 42 15 50 38 11 19 0 0 51 38 34 21 50 33 79 302 -57 51 44 37 51 32 30 52 10 18 51 6 50 18 0 0 52 5 54 21 50 40 80 301 -57 52 11 54 51 59 54 52 37 20 51 34 28 17 0 0 52 32 14 21 50 47 80 299 -56 52 38 11 52 26 18 53 3 23 52 1 6 16 0 0 52 57 38 21 50 54 81 298 -55 53 3 31 52 51 44 53 28 30 52 26 46 15 0 0 53 22 5 21 51 1 82 296 -55 53 27 55 53 16 15 53 52 41 52 51 30 14 0 0 53 45 38 21 51 8 82 295 -54 53 51 25 53 39 51 54 15 58 53 15 19 13 0 0 54 8 19 21 51 14 83 293 -54 54 14 3 54 2 35 54 38 24 53 38 15 12 0 0 54 30 9 21 51 20 83 291 -53 54 35 50 54 24 27 54 59 58 54 0 19 11 0 0 54 51 9 21 51 27 84 289 -52 54 56 48 54 45 30 55 20 44 54 21 34 10 0 0 55 11 21 21 51 33 84 286 -52 55 16 57 55 5 45 55 40 43 54 42 0 9 0 0 55 30 47 21 51 39 85 282 -51 55 36 21 55 25 14 55 59 55 55 1 40 8 0 0 55 49 27 21 51 45 85 278 -51 55 54 59 55 43 56 56 18 22 55 20 33 7 0 0 56 7 24 21 51 51 85 271 -50 56 12 52 56 1 55 56 36 6 55 38 42 6 0 0 56 24 37 21 51 57 86 261 -50 56 30 4 56 19 11 56 53 8 55 56 7 5 0 0 56 41 9 21 52 3 86 245 -49 56 46 33 56 35 45 57 9 28 56 12 51 4 0 0 56 57 0 21 52 8 86 217 -49 57 2 22 56 51 38 57 25 8 56 28 53 3 0 0 57 12 12 21 52 14 86 185 -48 57 17 32 57 6 52 57 40 8 56 44 16 2 0 0 57 26 45 21 52 20 86 161 -48 57 32 3 57 21 27 57 54 31 56 58 59 1 0 0 57 40 40 21 52 25 86 147 -47 57 45 56 57 35 24 58 8 16 57 13 5 0 0 0 57 53 59 21 52 31 85 139 -47 57 59 13 57 48 45 58 21 25 57 26 33 - 1 0 0 58 6 42 21 52 36 85 133 -46 58 11 54 58 1 29 58 33 59 57 39 25 - 2 0 0 58 18 50 21 52 41 85 129 -46 58 24 0 58 13 39 58 45 58 57 51 42 - 3 0 0 58 30 23 21 52 46 84 125 -45 58 35 32 58 25 14 58 57 23 58 3 24 - 4 0 0 58 41 23 21 52 52 84 123 -45 58 46 31 58 36 16 59 8 15 58 14 32 - 5 0 0 58 51 51 21 52 57 84 120 -44 58 56 57 58 46 44 59 18 35 58 25 7 - 6 0 0 59 1 46 21 53 2 83 118 -44 59 6 50 58 56 41 59 28 23 58 35 9 - 7 0 0 59 11 9 21 53 7 83 117 -43 59 16 13 59 6 6 59 37 39 58 44 39 - 8 0 0 59 20 2 21 53 12 82 115 -43 59 25 4 59 15 0 59 46 26 58 53 38 - 9 0 0 59 28 24 21 53 17 82 114 -42 59 33 25 59 23 23 59 54 42 59 2 7 - 10 0 0 59 36 16 21 53 22 81 112 -42 59 41 16 59 31 17 60 2 28 59 10 5 - 11 0 0 59 43 39 21 53 26 81 111 -41 59 48 38 59 38 41 60 9 46 59 17 33 - 12 0 0 59 50 33 21 53 31 81 110 -41 59 55 31 59 45 36 60 16 34 59 24 33 - 13 0 0 59 56 59 21 53 36 80 108 -40 60 1 56 59 52 2 60 22 55 59 31 3 - 14 0 0 60 2 56 21 53 41 80 107 -40 60 7 52 59 58 0 60 28 48 59 37 5 - 15 0 0 60 8 26 21 53 45 79 106 -39 60 13 21 60 3 30 60 34 13 59 42 38 - 16 0 0 60 13 28 21 53 50 79 105 -39 60 18 22 60 8 33 60 39 12 59 47 44 - 17 0 0 60 18 3 21 53 55 78 104 -39 60 22 57 60 13 9 60 43 43 59 52 23 - 18 0 0 60 22 11 21 53 59 78 103 -38 60 27 4 60 17 18 60 47 48 59 56 34 - 19 0 0 60 25 52 21 54 4 77 102 -38 60 30 45 60 21 0 60 51 27 60 0 18 - 20 0 0 60 29 8 21 54 8 77 101 -37 60 34 0 60 24 15 60 54 40 60 3 36 - 21 0 0 60 31 56 21 54 13 76 100 -37 60 36 48 60 27 4 60 57 26 60 6 27 - 22 0 0 60 34 19 21 54 17 76 99 -36 60 39 11 60 29 28 60 59 48 60 8 51 - 23 0 0 60 36 16 21 54 22 75 98 -36 60 41 8 60 31 25 61 1 43 60 10 50 - 24 0 0 60 37 47 21 54 26 75 97 -35 60 42 39 60 32 56 61 3 13 60 12 22 - 25 0 0 60 38 53 21 54 31 75 96 -35 60 43 44 60 34 2 61 4 18 60 13 28 - 26 0 0 60 39 33 21 54 35 74 95 -34 60 44 24 60 34 42 61 4 57 60 14 8 - 27 0 0 60 39 47 21 54 40 74 94 -34 60 44 38 60 34 56 61 5 11 60 14 23 - 28 0 0 60 39 35 21 54 44 73 93 -34 60 44 26 60 34 45 61 5 0 60 14 11 - 29 0 0 60 38 58 21 54 49 73 92 -33 60 43 49 60 34 8 61 4 23 60 13 34 - 30 0 0 60 37 56 21 54 53 72 91 -33 60 42 47 60 33 5 61 3 21 60 12 30 - 31 0 0 60 36 27 21 54 57 72 90 -32 60 41 19 60 31 36 61 1 54 60 11 1 - 32 0 0 60 34 33 21 55 2 71 89 -32 60 39 25 60 29 42 61 0 1 60 9 5 - 33 0 0 60 32 13 21 55 6 71 88 -31 60 37 5 60 27 21 60 57 43 60 6 44 - 34 0 0 60 29 27 21 55 11 70 87 -31 60 34 19 60 24 35 60 54 59 60 3 55 - 35 0 0 60 26 15 21 55 15 70 86 -30 60 31 7 60 21 22 60 51 49 60 0 41 - 36 0 0 60 22 36 21 55 19 69 85 -30 60 27 29 60 17 43 60 48 13 59 56 59 - 37 0 0 60 18 30 21 55 24 69 84 -30 60 23 24 60 13 36 60 44 10 59 52 50 - 38 0 0 60 13 58 21 55 28 68 83 -29 60 18 53 60 9 3 60 39 41 59 48 15 - 39 0 0 60 8 58 21 55 33 68 83 -29 60 13 54 60 4 3 60 34 46 59 43 11 - 40 0 0 60 3 31 21 55 37 67 82 -28 60 8 27 59 58 35 60 29 23 59 37 40 - 41 0 0 59 57 36 21 55 41 67 81 -28 60 2 33 59 52 39 60 23 32 59 31 41 - 42 0 0 59 51 13 21 55 46 66 80 -27 59 56 11 59 46 15 60 17 14 59 25 13 - 43 0 0 59 44 21 21 55 50 66 79 -27 59 49 20 59 39 23 60 10 27 59 18 16 - 44 0 0 59 37 1 21 55 55 65 78 -26 59 42 1 59 32 1 60 3 12 59 10 50 - 45 0 0 59 29 10 21 55 59 65 77 -26 59 34 11 59 24 10 59 55 27 59 2 54 - 46 0 0 59 20 50 21 56 4 64 76 -25 59 25 52 59 15 48 59 47 13 58 54 27 - 47 0 0 59 11 59 21 56 8 64 75 -25 59 17 3 59 6 56 59 38 29 58 45 30 - 48 0 0 59 2 38 21 56 13 63 75 -24 59 7 42 58 57 33 59 29 14 58 36 1 - 49 0 0 58 52 44 21 56 17 63 74 -24 58 57 50 58 47 38 59 19 28 58 26 0 - 50 0 0 58 42 18 21 56 22 62 73 -23 58 47 26 58 37 11 59 9 10 58 15 27 - 51 0 0 58 31 19 21 56 26 62 72 -23 58 36 28 58 26 10 58 58 19 58 4 20 - 52 0 0 58 19 47 21 56 31 61 71 -22 58 24 57 58 14 36 58 46 55 57 52 39 - 53 0 0 58 7 40 21 56 36 61 70 -22 58 12 52 58 2 27 58 34 57 57 40 23 - 54 0 0 57 54 57 21 56 40 60 69 -21 58 0 11 57 49 43 58 22 24 57 27 31 - 55 0 0 57 41 39 21 56 45 60 68 -21 57 46 55 57 36 23 58 9 15 57 14 3 - 56 0 0 57 27 43 21 56 50 59 68 -20 57 33 1 57 22 25 57 55 29 56 59 58 - 57 0 0 57 13 10 21 56 55 58 67 -20 57 18 30 57 7 50 57 41 7 56 45 14 - 58 0 0 56 57 58 21 56 59 58 66 -19 57 3 20 56 52 36 57 26 5 56 29 50 - 59 0 0 56 42 5 21 57 4 57 65 -18 56 47 30 56 36 41 57 10 24 56 13 47 - 60 0 0 56 25 32 21 57 9 57 64 -18 56 30 59 56 20 6 56 54 3 55 57 2 - 61 0 0 56 8 17 21 57 14 56 63 -17 56 13 46 56 2 48 56 37 0 55 39 34 - 62 0 0 55 50 18 21 57 19 55 63 -17 55 55 49 55 44 47 56 19 14 55 21 22 - 63 0 0 55 31 34 21 57 24 55 62 -16 55 37 8 55 26 1 56 0 44 55 2 26 - 64 0 0 55 12 5 21 57 29 54 61 -15 55 17 42 55 6 29 55 41 28 54 42 43 - 65 0 0 54 51 48 21 57 34 53 60 -15 54 57 28 54 46 9 55 21 25 54 22 12 - 66 0 0 54 30 43 21 57 39 53 59 -14 54 36 25 54 25 1 55 0 35 54 0 52 - 67 0 0 54 8 47 21 57 44 52 58 -14 54 14 32 54 3 3 54 38 54 53 38 41 - 68 0 0 53 46 0 21 57 50 51 58 -13 53 51 48 53 40 12 54 16 23 53 15 38 - 69 0 0 53 22 19 21 57 55 51 57 -12 53 28 10 53 16 28 53 52 58 52 51 41 - 70 0 0 52 57 43 21 58 0 50 56 -12 53 3 37 52 51 49 53 28 39 52 26 48 - 71 0 0 52 32 10 21 58 5 49 55 -11 52 38 7 52 26 12 53 3 23 52 0 57 - 72 0 0 52 5 38 21 58 11 49 54 -10 52 11 39 51 59 37 52 37 9 51 34 8 - 73 0 0 51 38 5 21 58 16 48 54 -9 51 44 10 51 32 1 52 9 55 51 6 17 - 74 0 0 51 9 30 21 58 22 47 53 -9 51 15 38 51 3 22 51 41 38 50 37 22 - 75 0 0 50 39 50 21 58 27 46 52 -8 50 46 1 50 33 38 51 12 17 50 7 22 - 76 0 0 50 9 2 21 58 33 45 51 -7 50 15 18 50 2 47 50 41 50 49 36 15 - 77 0 0 49 37 6 21 58 38 45 51 -6 49 43 25 49 30 46 50 10 14 49 3 58 - 78 0 0 49 3 57 21 58 44 44 50 -6 49 10 21 48 57 34 49 37 27 48 30 28 - 79 0 0 48 29 35 21 58 50 43 49 -5 48 36 3 48 23 7 49 3 27 47 55 44 - 80 0 0 47 53 56 21 58 55 42 48 -4 48 0 28 47 47 24 48 28 11 47 19 42 - 81 0 0 47 16 58 21 59 1 41 48 -3 47 23 35 47 10 22 47 51 36 46 42 21 - 82 0 0 46 38 38 21 59 7 40 47 -2 46 45 19 46 31 57 47 13 39 46 3 38 - 83 0 0 45 58 54 21 59 13 39 46 -1 46 5 39 45 52 8 46 34 19 45 23 29 - 84 0 0 45 17 42 21 59 18 38 45 0 45 24 32 45 10 52 45 53 32 44 41 52 Uncertainty in time = +/- 3 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 3688-00529-1 * constellation : Perseus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 59 56.8054 DE: +55 51 52.029 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .013, .016 ) * V mag [mag]: 10.5 * B mag [mag]: 11.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1508) Kemi approx. diameter [km]: 18 approx. diameter ["]: .027 distance from Earth [AU]: 0.92600 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 624 number of rejected observations: 31 time covered by the observations: 1935 Mar 28 - 2012 Oct 31 1 sigma uncertainty ellipse (major, minor, PA): 0.061, 0.038, -149° remarks: * orbital elements for (1508) Kemi : Mean anomaly = 340.45258614 deg Arg. of pericenter = 92.79802460 deg Long. of node = 14.34308833 deg Inclination = 28.72999662 deg Eccentricity = 0.41757966 Semimajor axis = 2.77081953 AU Perihelion dist = 1.61378166 AU Mag: H = 11.96, G = 0.15 Epoch of elements : MJD 56250.91100000 TDT (2012 Nov 19.911) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 19 1508 Kemi 21h 52.2m UT 10.5 1 59 56.805 55 51 52.03TYC 3688-00529-1 11.6 14.2 18 1.5 0.926 -6.732 26.29 2.6229 55.857 -151.63 -19.71 21.8692 0.00975 0.01531 -5.96812 2.77230 0.00212 -0.00263 2000 340.25791120121119.00000 92.798025 14.343088 28.7299970.41757966 2.7708195 1.613781712.0 5.00.15 RATE 2.1369370 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.059 0.036 213 3.12 0.057 0 0 4-1 056247.0020121119_0529-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org