IOTA/IOTA-ES occultation update for (4489) 1988 AK / TYC 2467-00054-1 event on 2012 Dec 18, 05:01 UT Visible from USA Summary ------- On 2012 Dec 18 UT, the 95 km diameter asteroid (4489) 1988 AK will occult a 11.1 mag star in the constellation Gemini for observers along a path across USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.0 mag to 16.1 mag (the magnitude of the asteroid) for at most 6.1 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: 28 * date and approx. time of event: 2012 Dec 18, 04:53 - 2012 Dec 18, 05:06 UT * geocentric midpoint of event [JD]: 2456279.70824167 * magnitude of target star: 11.1 * magnitude drop [mag]: 5.0 * estimated maximum duration [s]: 6.1 * Moon: 30 % sunlit, 139° distance * Sun: 150° distance * rough path description: USA The occultation path -------------------- * approximate projected width [km]: 96 * 1 sigma uncertainty interval [path widths]: +/- 2.36 * 1 sigma uncertainty interval [seconds]: +/- 13.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .093 +/- .058) * 1 sigma uncertainty ellipse (major, minor, PA): ( .093", .058", 82° ) * approx speed of asteroid's shadow [km/s]: 15.6032 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2467-00054-1 by 4489 1988 AK on 2012 Dec 18 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 2 14 5 -27 0 0 4 53 30 18 322 -1 2 53 22 1 34 51 6 0 0 - 1 29 25 1 14 41 -26 0 0 4 53 33 19 322 -2 1 53 32 0 35 54 4 57 56 - 2 26 26 0 16 8 -25 0 0 4 53 37 21 323 -3 0 54 34 - 0 22 15 3 56 54 - 3 22 48 - 0 41 40 -24 0 0 4 53 40 22 323 -4 - 0 3 36 - 1 19 40 2 56 48 - 4 18 33 - 1 38 46 -23 0 0 4 53 44 23 324 -6 - 1 1 4 - 2 16 26 1 57 34 - 5 13 47 - 2 35 15 -22 0 0 4 53 48 25 324 -7 - 1 57 52 - 3 12 36 0 59 8 - 6 8 33 - 3 31 11 -21 0 0 4 53 52 26 324 -8 - 2 54 6 - 4 8 14 0 1 24 - 7 2 54 - 4 26 36 -20 0 0 4 53 56 27 325 -9 - 3 49 48 - 5 3 24 - 0 55 42 - 7 56 53 - 5 21 36 -19 0 0 4 54 0 29 325 -11 - 4 45 2 - 5 58 8 - 1 52 12 - 8 50 34 - 6 16 12 -18 0 0 4 54 5 30 325 -12 - 5 39 52 - 6 52 31 - 2 48 11 - 9 43 59 - 7 10 28 -17 0 0 4 54 10 31 326 -13 - 6 34 20 - 7 46 35 - 3 43 42 - 10 37 11 - 8 4 26 -16 0 0 4 54 15 32 326 -14 - 7 28 30 - 8 40 23 - 4 38 48 - 11 30 13 - 8 58 11 -15 0 0 4 54 20 34 327 -15 - 8 22 24 - 9 33 58 - 5 33 33 - 12 23 8 - 9 51 44 -14 0 0 4 54 25 35 327 -17 - 9 16 6 - 10 27 24 - 6 28 0 - 13 15 59 - 10 45 9 -13 0 0 4 54 31 36 327 -18 - 10 9 39 - 11 20 42 - 7 22 11 - 14 8 49 - 11 38 29 -12 0 0 4 54 36 38 327 -19 - 11 3 4 - 12 13 55 - 8 16 10 - 15 1 39 - 12 31 45 -11 0 0 4 54 42 39 328 -20 - 11 56 25 - 13 7 6 - 9 9 58 - 15 54 32 - 13 25 0 -10 0 0 4 54 48 40 328 -22 - 12 49 44 - 14 0 18 - 10 3 40 - 16 47 32 - 14 18 18 - 9 0 0 4 54 54 41 328 -23 - 13 43 5 - 14 53 34 - 10 57 18 - 17 40 40 - 15 11 41 - 8 0 0 4 55 1 43 329 -24 - 14 36 29 - 15 46 55 - 11 50 54 - 18 34 0 - 16 5 10 - 7 0 0 4 55 7 44 329 -25 - 15 29 59 - 16 40 25 - 12 44 30 - 19 27 33 - 16 58 50 - 6 0 0 4 55 14 45 329 -27 - 16 23 39 - 17 34 6 - 13 38 11 - 20 21 23 - 17 52 43 - 5 0 0 4 55 21 47 330 -28 - 17 17 29 - 18 28 0 - 14 31 57 - 21 15 33 - 18 46 51 - 4 0 0 4 55 28 48 330 -29 - 18 11 34 - 19 22 12 - 15 25 53 - 22 10 4 - 19 41 17 - 3 0 0 4 55 35 49 330 -30 - 19 5 56 - 20 16 42 - 16 20 0 - 23 5 1 - 20 36 4 - 2 0 0 4 55 42 51 331 -32 - 20 0 38 - 21 11 34 - 17 14 21 - 24 0 25 - 21 31 14 - 1 0 0 4 55 50 52 331 -33 - 20 55 41 - 22 6 52 - 18 8 58 - 24 56 20 - 22 26 51 0 0 0 4 55 58 53 332 -34 - 21 51 10 - 23 2 37 - 19 3 56 - 25 52 50 - 23 22 57 1 0 0 4 56 5 54 332 -35 - 22 47 8 - 23 58 53 - 19 59 16 - 26 49 56 Latitude Latitude Latitude Latitude - 25 0 0 2 42 24 4 56 19 57 333 -38 3 20 11 2 4 30 6 17 10 - 0 56 6 - 26 0 0 3 44 46 4 56 28 58 333 -39 4 22 20 3 7 5 7 18 19 0 7 34 - 27 0 0 4 46 22 4 56 37 59 334 -40 5 23 42 4 8 55 8 18 40 1 10 30 - 28 0 0 5 47 9 4 56 45 61 335 -41 6 24 16 5 9 56 9 18 10 2 12 39 - 29 0 0 6 47 6 4 56 54 62 335 -43 7 23 58 6 10 7 10 16 48 3 13 59 - 30 0 0 7 46 10 4 57 3 63 336 -44 8 22 48 7 9 25 11 14 32 4 14 28 - 31 0 0 8 44 19 4 57 12 65 337 -45 9 20 43 8 7 49 12 11 21 5 14 3 - 32 0 0 9 41 33 4 57 21 66 338 -47 10 17 43 9 5 18 13 7 13 6 12 44 - 33 0 0 10 37 50 4 57 29 67 339 -48 11 13 45 10 1 50 14 2 7 7 10 28 - 34 0 0 11 33 8 4 57 38 68 340 -49 12 8 48 10 57 23 14 56 2 8 7 14 - 35 0 0 12 27 27 4 57 47 69 342 -50 13 2 52 11 51 57 15 48 57 9 3 1 - 36 0 0 13 20 46 4 57 56 70 343 -51 13 55 56 12 45 31 16 40 51 9 57 49 - 37 0 0 14 13 4 4 58 4 72 345 -53 14 47 58 13 38 4 17 31 45 10 51 35 - 38 0 0 15 4 20 4 58 13 73 347 -54 15 38 59 14 29 35 18 21 36 11 44 19 - 39 0 0 15 54 33 4 58 22 74 349 -55 16 28 58 15 20 4 19 10 26 12 36 1 - 40 0 0 16 43 45 4 58 30 75 351 -56 17 17 55 16 9 30 19 58 13 13 26 40 - 41 0 0 17 31 54 4 58 39 75 354 -57 18 5 49 16 57 54 20 44 59 14 16 16 - 42 0 0 18 18 59 4 58 47 76 357 -58 18 52 40 17 45 15 21 30 41 15 4 49 - 43 0 0 19 5 3 4 58 56 77 1 -59 19 38 28 18 31 33 22 15 22 15 52 18 - 44 0 0 19 50 3 4 59 4 78 5 -60 20 23 14 19 16 48 22 59 1 16 38 44 - 45 0 0 20 34 1 4 59 12 78 9 -61 21 6 58 20 1 0 23 41 37 17 24 6 - 46 0 0 21 16 56 4 59 21 79 14 -62 21 49 39 20 44 10 24 23 13 18 8 25 - 47 0 0 21 58 50 4 59 29 79 19 -63 22 31 19 21 26 18 25 3 47 18 51 41 - 48 0 0 22 39 42 4 59 37 80 25 -64 23 11 57 22 7 24 25 43 21 19 33 55 - 49 0 0 23 19 33 4 59 45 80 30 -65 23 51 34 22 47 28 26 21 54 20 15 6 - 50 0 0 23 58 23 4 59 52 80 36 -66 24 30 10 23 26 32 26 59 28 20 55 15 - 51 0 0 24 36 13 5 0 0 80 42 -67 25 7 47 24 4 35 27 36 3 21 34 22 - 52 0 0 25 13 3 5 0 8 79 47 -68 25 44 24 24 41 39 28 11 40 22 12 29 - 53 0 0 25 48 55 5 0 15 79 52 -69 26 20 3 25 17 43 28 46 18 22 49 36 - 54 0 0 26 23 48 5 0 23 79 57 -70 26 54 43 25 52 49 29 20 0 23 25 42 - 55 0 0 26 57 43 5 0 30 78 61 -71 27 28 26 26 26 57 29 52 46 24 0 50 - 56 0 0 27 30 42 5 0 37 78 65 -71 28 1 13 27 0 7 30 24 36 24 34 59 - 57 0 0 28 2 44 5 0 44 77 68 -72 28 33 3 27 32 21 30 55 31 25 8 10 - 58 0 0 28 33 50 5 0 52 77 71 -73 29 3 58 28 3 39 31 25 31 25 40 25 - 59 0 0 29 4 2 5 0 58 76 74 -74 29 33 58 28 34 2 31 54 39 26 11 42 - 60 0 0 29 33 19 5 1 5 75 76 -74 30 3 5 29 3 31 32 22 54 26 42 5 - 61 0 0 30 1 44 5 1 12 75 78 -75 30 31 18 29 32 6 32 50 16 27 11 32 - 62 0 0 30 29 15 5 1 19 74 80 -75 30 58 39 29 59 48 33 16 48 27 40 5 - 63 0 0 30 55 55 5 1 25 73 81 -76 31 25 8 30 26 38 33 42 29 28 7 44 - 64 0 0 31 21 43 5 1 32 72 83 -76 31 50 46 30 52 37 34 7 21 28 34 31 - 65 0 0 31 46 41 5 1 38 72 84 -77 32 15 34 31 17 44 34 31 23 29 0 26 - 66 0 0 32 10 49 5 1 45 71 85 -77 32 39 33 31 42 2 34 54 38 29 25 29 - 67 0 0 32 34 8 5 1 51 70 85 -78 33 2 43 32 5 30 35 17 5 29 49 41 - 68 0 0 32 56 39 5 1 57 69 86 -78 33 25 5 32 28 10 35 38 45 30 13 4 - 69 0 0 33 18 21 5 2 3 68 87 -78 33 46 39 32 50 1 35 59 38 30 35 37 - 70 0 0 33 39 17 5 2 9 68 87 -78 34 7 26 33 11 6 36 19 47 30 57 22 - 71 0 0 33 59 27 5 2 15 67 87 -78 34 27 28 33 31 23 36 39 10 31 18 19 - 72 0 0 34 18 51 5 2 21 66 88 -78 34 46 44 33 50 55 36 57 50 31 38 28 - 73 0 0 34 37 29 5 2 26 65 88 -78 35 5 15 34 9 41 37 15 45 31 57 50 - 74 0 0 34 55 23 5 2 32 64 88 -78 35 23 2 34 27 43 37 32 58 32 16 27 - 75 0 0 35 12 34 5 2 37 64 88 -78 35 40 5 34 45 0 37 49 29 32 34 18 - 76 0 0 35 29 0 5 2 43 63 88 -78 35 56 25 35 1 34 38 5 17 32 51 24 - 77 0 0 35 44 44 5 2 48 62 88 -78 36 12 2 35 17 24 38 20 24 33 7 45 - 78 0 0 35 59 46 5 2 54 61 88 -77 36 26 58 35 32 32 38 34 51 33 23 23 - 79 0 0 36 14 6 5 2 59 61 88 -77 36 41 12 35 46 58 38 48 37 33 38 17 - 80 0 0 36 27 44 5 3 4 60 88 -76 36 54 45 36 0 42 39 1 43 33 52 28 - 81 0 0 36 40 42 5 3 9 59 88 -76 37 7 37 36 13 45 39 14 10 34 5 57 - 82 0 0 36 52 59 5 3 14 58 87 -76 37 19 49 36 26 7 39 25 58 34 18 44 - 83 0 0 37 4 36 5 3 19 57 87 -75 37 31 21 36 37 49 39 37 8 34 30 49 - 84 0 0 37 15 34 5 3 24 57 87 -75 37 42 14 36 48 51 39 47 39 34 42 13 - 85 0 0 37 25 52 5 3 29 56 87 -74 37 52 28 36 59 14 39 57 33 34 52 57 - 86 0 0 37 35 32 5 3 33 55 86 -74 38 2 3 37 8 57 40 6 50 35 3 0 - 87 0 0 37 44 32 5 3 38 54 86 -73 38 11 1 37 18 2 40 15 29 35 12 22 - 88 0 0 37 52 55 5 3 43 54 86 -73 38 19 20 37 26 28 40 23 32 35 21 5 - 89 0 0 38 0 40 5 3 47 53 85 -72 38 27 1 37 34 16 40 30 58 35 29 9 - 90 0 0 38 7 47 5 3 52 52 85 -71 38 34 5 37 41 26 40 37 48 35 36 33 - 91 0 0 38 14 16 5 3 56 51 85 -71 38 40 32 37 47 58 40 44 1 35 43 19 - 92 0 0 38 20 8 5 4 1 51 84 -70 38 46 21 37 53 53 40 49 40 35 49 25 - 93 0 0 38 25 24 5 4 5 50 84 -70 38 51 34 37 59 11 40 54 42 35 54 53 - 94 0 0 38 30 2 5 4 9 49 83 -69 38 56 11 38 3 51 40 59 10 35 59 43 - 95 0 0 38 34 4 5 4 13 48 83 -68 39 0 11 38 7 54 41 3 2 36 3 54 - 96 0 0 38 37 29 5 4 18 48 83 -68 39 3 34 38 11 21 41 6 18 36 7 27 - 97 0 0 38 40 17 5 4 22 47 82 -67 39 6 22 38 14 10 41 9 0 36 10 22 - 98 0 0 38 42 29 5 4 26 46 82 -66 39 8 33 38 16 23 41 11 7 36 12 40 - 99 0 0 38 44 5 5 4 30 45 81 -66 39 10 8 38 18 0 41 12 39 36 14 19 -100 0 0 38 45 5 5 4 34 45 81 -65 39 11 7 38 19 0 41 13 37 36 15 21 -101 0 0 38 45 28 5 4 38 44 80 -64 39 11 30 38 19 23 41 13 59 36 15 45 -102 0 0 38 45 15 5 4 41 43 80 -64 39 11 17 38 19 10 41 13 47 36 15 30 -103 0 0 38 44 25 5 4 45 42 79 -63 39 10 28 38 18 20 41 13 0 36 14 39 -104 0 0 38 42 59 5 4 49 42 79 -62 39 9 3 38 16 53 41 11 38 36 13 9 -105 0 0 38 40 57 5 4 53 41 78 -62 39 7 2 38 14 50 41 9 41 36 11 1 -106 0 0 38 38 18 5 4 56 40 78 -61 39 4 24 38 12 10 41 7 9 36 8 15 -107 0 0 38 35 3 5 5 0 39 77 -60 39 1 10 38 8 53 41 4 2 36 4 51 -108 0 0 38 31 10 5 5 3 38 77 -60 38 57 19 38 4 59 41 0 19 36 0 48 -109 0 0 38 26 41 5 5 7 38 76 -59 38 52 52 38 0 27 40 56 1 35 56 7 -110 0 0 38 21 34 5 5 10 37 76 -58 38 47 48 37 55 18 40 51 7 35 50 47 -111 0 0 38 15 50 5 5 14 36 75 -58 38 42 6 37 49 32 40 45 38 35 44 48 -112 0 0 38 9 28 5 5 17 35 75 -57 38 35 47 37 43 7 40 39 32 35 38 10 -113 0 0 38 2 29 5 5 20 35 74 -56 38 28 51 37 36 4 40 32 50 35 30 52 -114 0 0 37 54 51 5 5 23 34 74 -55 38 21 16 37 28 23 40 25 31 35 22 54 -115 0 0 37 46 34 5 5 27 33 73 -55 38 13 3 37 20 3 40 17 35 35 14 16 -116 0 0 37 37 38 5 5 30 32 72 -54 38 4 12 37 11 3 40 9 2 35 4 58 -117 0 0 37 28 4 5 5 33 31 72 -53 37 54 41 37 1 24 39 59 51 34 54 58 -118 0 0 37 17 49 5 5 36 31 71 -52 37 44 31 36 51 5 39 50 2 34 44 18 -119 0 0 37 6 55 5 5 39 30 71 -52 37 33 41 36 40 6 39 39 34 34 32 55 -120 0 0 36 55 20 5 5 42 29 70 -51 37 22 11 36 28 25 39 28 28 34 20 50 -121 0 0 36 43 3 5 5 44 28 70 -50 37 10 0 36 16 4 39 16 42 34 8 3 -122 0 0 36 30 6 5 5 47 27 69 -49 36 57 8 36 3 0 39 4 17 33 54 32 -123 0 0 36 16 26 5 5 50 27 69 -49 36 43 35 35 49 15 38 51 11 33 40 18 -124 0 0 36 2 4 5 5 53 26 68 -48 36 29 18 35 34 46 38 37 24 33 25 19 -125 0 0 35 46 58 5 5 55 25 68 -47 36 14 19 35 19 34 38 22 55 33 9 35 -126 0 0 35 31 9 5 5 58 24 67 -46 35 58 37 35 3 38 38 7 45 32 53 5 -127 0 0 35 14 35 5 6 0 23 66 -46 35 42 10 34 46 57 37 51 52 32 35 50 -128 0 0 34 57 16 5 6 3 22 66 -45 35 24 59 34 29 30 37 35 15 32 17 47 -129 0 0 34 39 12 5 6 5 22 65 -44 35 7 2 34 11 18 37 17 55 31 58 57 -130 0 0 34 20 21 5 6 7 21 65 -43 34 48 19 33 52 19 36 59 49 31 39 19 -131 0 0 34 0 42 5 6 10 20 64 -42 34 28 50 33 32 32 36 40 59 31 18 52 -132 0 0 33 40 16 5 6 12 19 64 -41 34 8 32 33 11 57 36 21 22 30 57 35 -133 0 0 33 19 1 5 6 14 18 63 -41 33 47 26 32 50 33 36 0 58 30 35 27 -134 0 0 32 56 57 5 6 16 17 63 -40 33 25 31 32 28 19 35 39 47 30 12 27 -135 0 0 32 34 2 5 6 18 16 62 -39 33 2 46 32 5 15 35 17 47 29 48 36 -136 0 0 32 10 16 5 6 20 15 62 -38 32 39 10 31 41 19 34 54 58 29 23 51 -137 0 0 31 45 38 5 6 21 14 61 -37 32 14 43 31 16 30 34 31 18 28 58 12 -138 0 0 31 20 7 5 6 23 13 61 -36 31 49 22 30 50 48 34 6 48 28 31 39 -139 0 0 30 53 42 5 6 25 12 60 -35 31 23 8 30 24 12 33 41 25 28 4 9 -140 0 0 30 26 22 5 6 26 11 60 -34 30 56 0 29 56 41 33 15 10 27 35 43 -141 0 0 29 58 7 5 6 27 10 59 -33 30 27 56 29 28 14 32 48 0 27 6 19 -142 0 0 29 28 54 5 6 29 9 59 -33 29 58 56 28 58 49 32 19 56 26 35 56 -143 0 0 28 58 44 5 6 30 8 58 -32 29 28 58 28 28 27 31 50 56 26 4 34 -144 0 0 28 27 36 5 6 31 7 58 -31 28 58 2 27 57 5 31 20 59 25 32 10 -145 0 0 27 55 28 5 6 32 6 57 -30 28 26 7 27 24 44 30 50 4 24 58 45 -146 0 0 27 22 19 5 6 32 5 57 -29 27 53 12 26 51 22 30 18 11 24 24 18 -147 0 0 26 48 8 5 6 33 4 56 -28 27 19 15 26 16 57 29 45 18 23 48 47 -148 0 0 26 12 55 5 6 34 3 56 -27 26 44 16 25 41 30 29 11 24 23 12 11 -149 0 0 25 36 38 5 6 34 2 55 -26 26 8 14 25 4 59 28 36 29 22 34 30 -150 0 0 24 59 17 5 6 34 1 55 -25 25 31 7 24 27 22 28 0 30 .. .. .. Uncertainty in time = +/- 18 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 2467-00054-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 55 42.1973 DE: +31 52 14.367 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .025 ) * V mag [mag]: 11.1 * B mag [mag]: 11.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4489) 1988 AK approx. diameter [km]: 95 approx. diameter ["]: .032 distance from Earth [AU]: 4.05600 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 669 number of rejected observations: 17 time covered by the observations: 1980 May 17 - 2012 Nov 15 1 sigma uncertainty ellipse (major, minor, PA): 0.091, 0.052, 82° remarks: * orbital elements for (4489) 1988 AK : Mean anomaly = 13.26271625 deg Arg. of pericenter = 9.25929953 deg Long. of node = 86.60700438 deg Inclination = 22.20632259 deg Eccentricity = 0.06095299 Semimajor axis = 5.24204920 AU Perihelion dist = 4.92253064 AU Mag: H = 9.25, G = 0.15 Epoch of elements : MJD 56279.20900000 TDT (2012 Dec 18.209) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 18 4489 1988 AK 4h 59.9m UT 11.1 7 55 42.197 31 52 14.37TYC 2467-00054-1 11.8 16.1 95 6.1 4.056 -1.166 12.01 -43.2588 31.867 104.21 -23.39 4.9978 -0.11009 -0.13607 -6.84635 5.53973 -0.00305 -0.00045 2000 12.506467201212 9.00000 9.259300 86.607004 22.2063230.06095299 5.2420492 4.9225306 9.1 5.00.15 RATE 0.8212060 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.093 0.058 82 3.36 0.076 0 0 3-3 056264.0020121218_0054-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org