IOTA/IOTA-ES occultation update for (951) Gaspra / TYC 0587-00858-1 event on 2009 Jan 09, 00:26 UT Visible from Caribbean Summary ------- On 2009 Jan 09 UT, the 16 km diameter asteroid (951) Gaspra will occult a 10.2 mag star in the constellation Pisces for observers along a path across Caribbean. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.3 mag to 15.5 mag (the magnitude of the asteroid) for at most 0.5 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: 26 * date and approx. time of event: 2009 Jan 09, 00:27 - 2009 Jan 09, 00:30 UT * magnitude of target star: 10.2 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 0.5 * Moon: 93 % sunlit, 79° distance * Sun: 71° distance * rough path description: Caribbean Additional comments ------------------- 15" double star The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 2.61 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .031", 86° ) * approx speed of asteroid's shadow [km/s]: 30.7186 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0587-00858-1 by 951 Gaspra on 2009 Jan 9 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 -102 0 0 18 48 58 0 27 50 68 224 -1 18 44 18 18 53 38 18 19 58 19 18 0 -101 0 0 19 8 30 0 27 53 67 225 -2 19 3 51 19 13 10 18 39 32 19 37 31 -100 0 0 19 27 51 0 27 57 66 226 -3 19 23 12 19 32 31 18 58 55 19 56 50 - 99 0 0 19 46 59 0 28 0 65 228 -4 19 42 20 19 51 39 19 18 5 20 15 57 - 98 0 0 20 5 55 0 28 3 64 229 -5 20 1 16 20 10 34 19 37 2 20 34 51 - 97 0 0 20 24 38 0 28 7 63 230 -6 20 19 59 20 29 16 19 55 46 20 53 32 - 96 0 0 20 43 7 0 28 10 62 231 -7 20 38 29 20 47 45 20 14 17 21 11 59 - 95 0 0 21 1 22 0 28 13 62 232 -8 20 56 44 21 6 0 20 32 34 21 30 13 - 94 0 0 21 19 24 0 28 16 61 233 -9 21 14 46 21 24 2 20 50 38 21 48 13 - 93 0 0 21 37 11 0 28 20 60 234 -10 21 32 34 21 41 49 21 8 27 22 5 58 - 92 0 0 21 54 44 0 28 23 59 235 -11 21 50 7 21 59 21 21 26 2 22 23 29 - 91 0 0 22 12 2 0 28 26 58 236 -12 22 7 25 22 16 39 21 43 21 22 40 45 - 90 0 0 22 29 5 0 28 29 57 237 -13 22 24 28 22 33 41 22 0 26 22 57 46 - 89 0 0 22 45 52 0 28 32 56 237 -14 22 41 16 22 50 28 22 17 16 23 14 31 - 88 0 0 23 2 24 0 28 35 55 238 -15 22 57 48 23 7 0 22 33 50 23 31 1 - 87 0 0 23 18 40 0 28 38 54 239 -16 23 14 5 23 23 16 22 50 8 23 47 16 - 86 0 0 23 34 41 0 28 41 53 240 -17 23 30 5 23 39 16 23 6 10 24 3 14 - 85 0 0 23 50 25 0 28 43 52 240 -18 23 45 50 23 54 59 23 21 56 24 18 56 - 84 0 0 24 5 52 0 28 46 51 241 -19 24 1 18 24 10 27 23 37 26 24 34 21 - 83 0 0 24 21 3 0 28 49 50 242 -20 24 16 29 24 25 38 23 52 39 24 49 30 - 82 0 0 24 35 58 0 28 52 49 243 -21 24 31 24 24 40 32 24 7 35 25 4 23 - 81 0 0 24 50 35 0 28 54 48 243 -22 24 46 2 24 55 9 24 22 15 25 18 58 - 80 0 0 25 4 55 0 28 57 48 244 -23 25 0 22 25 9 29 24 36 37 25 33 17 - 79 0 0 25 18 59 0 28 59 47 244 -23 25 14 26 25 23 32 24 50 42 25 47 18 - 78 0 0 25 32 45 0 29 2 46 245 -24 25 28 12 25 37 17 25 4 30 26 1 2 - 77 0 0 25 46 13 0 29 4 45 246 -25 25 41 41 25 50 45 25 18 0 26 14 28 - 76 0 0 25 59 24 0 29 7 44 246 -26 25 54 52 26 3 56 25 31 13 26 27 37 - 75 0 0 26 12 17 0 29 9 43 247 -27 26 7 45 26 16 48 25 44 8 26 40 28 - 74 0 0 26 24 52 0 29 11 42 247 -28 26 20 21 26 29 23 25 56 45 26 53 1 - 73 0 0 26 37 9 0 29 14 41 248 -29 26 32 38 26 41 40 26 9 4 27 5 17 - 72 0 0 26 49 9 0 29 16 40 249 -30 26 44 38 26 53 39 26 21 6 27 17 14 - 71 0 0 27 0 50 0 29 18 39 249 -31 26 56 19 27 5 20 26 32 49 27 28 53 - 70 0 0 27 12 13 0 29 20 38 250 -32 27 7 43 27 16 43 26 44 13 27 40 14 - 69 0 0 27 23 17 0 29 22 37 250 -33 27 18 48 27 27 47 26 55 20 27 51 17 - 68 0 0 27 34 4 0 29 24 37 251 -34 27 29 34 27 38 33 27 6 8 28 2 2 - 67 0 0 27 44 32 0 29 26 36 251 -35 27 40 2 27 49 1 27 16 38 28 12 28 - 66 0 0 27 54 41 0 29 28 35 252 -35 27 50 12 27 59 10 27 26 49 28 22 36 - 65 0 0 28 4 32 0 29 30 34 253 -36 28 0 3 28 9 1 27 36 42 28 32 25 - 64 0 0 28 14 5 0 29 32 33 253 -37 28 9 36 28 18 33 27 46 16 28 41 56 - 63 0 0 28 23 18 0 29 34 32 254 -38 28 18 50 28 27 47 27 55 31 28 51 8 - 62 0 0 28 32 14 0 29 36 31 254 -39 28 27 46 28 36 42 28 4 28 29 0 2 - 61 0 0 28 40 50 0 29 37 30 255 -40 28 36 22 28 45 18 28 13 6 29 8 37 - 60 0 0 28 49 8 0 29 39 29 255 -41 28 44 40 28 53 35 28 21 25 29 16 53 - 59 0 0 28 57 7 0 29 40 29 256 -42 28 52 39 29 1 34 28 29 25 29 24 51 - 58 0 0 29 4 47 0 29 42 28 256 -43 29 0 20 29 9 14 28 37 7 29 32 29 - 57 0 0 29 12 8 0 29 43 27 257 -43 29 7 41 29 16 35 28 44 30 29 39 49 - 56 0 0 29 19 11 0 29 45 26 257 -44 29 14 44 29 23 38 28 51 34 29 46 51 - 55 0 0 29 25 55 0 29 46 25 258 -45 29 21 28 29 30 21 28 58 18 29 53 33 - 54 0 0 29 32 19 0 29 48 24 258 -46 29 27 53 29 36 46 29 4 44 29 59 57 - 53 0 0 29 38 25 0 29 49 23 259 -47 29 33 59 29 42 52 29 10 52 30 6 2 - 52 0 0 29 44 13 0 29 50 22 259 -48 29 39 47 29 48 38 29 16 40 30 11 48 - 51 0 0 29 49 41 0 29 51 21 260 -49 29 45 15 29 54 7 29 22 9 30 17 15 - 50 0 0 29 54 50 0 29 53 21 261 -50 29 50 25 29 59 16 29 27 19 30 22 23 - 49 0 0 29 59 40 0 29 54 20 261 -51 29 55 15 30 4 6 29 32 11 30 27 13 - 48 0 0 30 4 12 0 29 55 19 262 -51 29 59 47 30 8 37 29 36 43 30 31 43 - 47 0 0 30 8 25 0 29 56 18 262 -52 30 3 59 30 12 50 29 40 56 30 35 55 - 46 0 0 30 12 18 0 29 57 17 263 -53 30 7 53 30 16 43 29 44 51 30 39 48 - 45 0 0 30 15 53 0 29 58 16 263 -54 30 11 28 30 20 18 29 48 26 30 43 22 - 44 0 0 30 19 9 0 29 59 15 264 -55 30 14 44 30 23 34 29 51 43 30 46 38 - 43 0 0 30 22 6 0 29 59 15 264 -56 30 17 41 30 26 31 29 54 40 30 49 34 - 42 0 0 30 24 44 0 30 0 14 265 -57 30 20 19 30 29 9 29 57 19 30 52 12 - 41 0 0 30 27 3 0 30 1 13 265 -57 30 22 38 30 31 28 29 59 38 30 54 30 - 40 0 0 30 29 3 0 30 2 12 266 -58 30 24 39 30 33 28 30 1 39 30 56 30 - 39 0 0 30 30 45 0 30 2 11 266 -59 30 26 20 30 35 9 30 3 21 30 58 11 - 38 0 0 30 32 7 0 30 3 10 267 -60 30 27 43 30 36 32 30 4 43 30 59 34 - 37 0 0 30 33 11 0 30 3 9 267 -61 30 28 47 30 37 35 30 5 47 31 0 37 - 36 0 0 30 33 56 0 30 4 8 268 -62 30 29 31 30 38 20 30 6 32 31 1 22 - 35 0 0 30 34 22 0 30 4 8 268 -62 30 29 57 30 38 46 30 6 58 31 1 48 - 34 0 0 30 34 29 0 30 5 7 269 -63 30 30 4 30 38 53 30 7 5 31 1 55 - 33 0 0 30 34 17 0 30 5 6 269 -64 30 29 53 30 38 42 30 6 54 31 1 43 - 32 0 0 30 33 47 0 30 5 5 270 -65 30 29 22 30 38 11 30 6 23 31 1 13 - 31 0 0 30 32 57 0 30 6 4 270 -66 30 28 33 30 37 22 30 5 33 31 0 24 - 30 0 0 30 31 49 0 30 6 3 271 -67 30 27 25 30 36 14 30 4 25 30 59 16 - 29 0 0 30 30 22 0 30 6 2 271 -68 30 25 58 30 34 47 30 2 58 30 57 49 - 28 0 0 30 28 37 0 30 6 2 272 -68 30 24 12 30 33 1 30 1 12 30 56 4 - 27 0 0 30 26 32 0 30 6 1 272 -69 30 22 8 30 30 57 29 59 7 30 54 0 Uncertainty in time = +/- 2 secs [Prediction of 2008 Dec 24.0] Data for the target star ------------------------ * name: TYC 0587-00858-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 54 10.9584 DE: +02 18 50.061 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .032, .029 ) * V mag [mag]: 10.2 * B mag [mag]: 11.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (951) Gaspra approx. diameter [km]: 16 approx. diameter ["]: .012 distance from Earth [AU]: 1.89800 * orbital information: orbit source: Preston date of fit: 2008 Dec 23 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1241 number of rejected observations: 57 time covered by the observations: 1913 Dec 19 - 2008 Dec 12 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.012, 69° remarks: * orbital elements for (951) Gaspra : Mean anomaly = 5.10476076 deg Arg. of pericenter = 129.52022978 deg Long. of node = 253.20253543 deg Inclination = 4.10124679 deg Eccentricity = 0.17303883 Semimajor axis = 2.20967888 AU Perihelion dist = 1.82731863 AU Mag: H = 11.50, G = 0.15 Epoch of elements : MJD 54840.01900000 TDT (2009 Jan 09.019) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 9 951 Gaspra 0h 26.7m UT 10.2 23 54 10.958 2 18 50.06TYC 0587-00858-1 11.3 15.5 16 0.5 1.898 5.046 27.06 -116.8130 2.307 175.08 -22.11 0.4450 -0.06297 0.17236 16.32490 5.84117 0.00449 0.00204 2000 2.09844420081230.00000129.520230253.202535 4.1012470.17303883 2.2096789 1.827318611.5 5.00.15 RATE 3.0006160 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.031 86 3.61 0.030 0 54824.0020090109_0858-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Dec 24, 06:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org