IOTA/IOTA-ES occultation update for (539) Pamina / TYC 6287-00184-1 event on 2008 Oct 13, 12:53 UT Visible from Japan, China, India Summary ------- On 2008 Oct 13 UT, the 54 km diameter asteroid (539) Pamina will occult a 11.1 mag star in the constellation Sagittarius for observers along a path across Japan, China, India. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 14.5 mag (the magnitude of the asteroid) for at most 2.7 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: 74 * date and approx. time of event: 2008 Oct 13, 12:54 - 2008 Oct 13, 12:58 UT * magnitude of target star: 11.1 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 2.7 * Moon: 98 % sunlit, 78° distance * Sun: 85° distance * rough path description: Japan, China, India The occultation path -------------------- * approximate projected width [km]: 65 * 1 sigma uncertainty interval [path widths]: +/- 0.77 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .025", 87° ) * approx speed of asteroid's shadow [km/s]: 20.0293 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6287-00184-1 by 539 Pamina on 2008 Oct 13 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 71 0 0 16 27 1 12 54 14 55 181 0 16 9 4 16 45 2 15 41 33 17 12 55 72 0 0 16 37 1 12 54 20 55 183 -1 16 19 3 16 55 4 15 51 30 17 22 58 73 0 0 16 47 26 12 54 25 55 185 -2 16 29 26 17 5 29 16 1 51 17 33 26 74 0 0 16 58 14 12 54 31 55 186 -3 16 40 13 17 16 19 16 12 36 17 44 17 75 0 0 17 9 26 12 54 36 54 188 -4 16 51 24 17 27 32 16 23 45 17 55 33 76 0 0 17 21 2 12 54 41 54 189 -5 17 2 58 17 39 9 16 35 17 18 7 12 77 0 0 17 33 1 12 54 47 54 191 -6 17 14 56 17 51 10 16 47 12 18 19 15 78 0 0 17 45 23 12 54 52 53 193 -7 17 27 16 18 3 33 16 59 31 18 31 40 79 0 0 17 58 7 12 54 58 53 194 -8 17 39 59 18 16 19 17 12 12 18 44 29 80 0 0 18 11 15 12 55 3 52 196 -9 17 53 5 18 29 28 17 25 15 18 57 40 81 0 0 18 24 44 12 55 8 52 197 -10 18 6 33 18 42 59 17 38 41 19 11 14 82 0 0 18 38 36 12 55 13 51 198 -11 18 20 23 18 56 52 17 52 28 19 25 9 83 0 0 18 52 49 12 55 19 51 200 -12 18 34 35 19 11 7 18 6 38 19 39 27 84 0 0 19 7 23 12 55 24 50 201 -13 18 49 8 19 25 43 18 21 8 19 54 5 85 0 0 19 22 19 12 55 29 50 202 -14 19 4 2 19 40 41 18 36 0 20 9 5 86 0 0 19 37 35 12 55 34 49 204 -15 19 19 16 19 55 58 18 51 12 20 24 26 87 0 0 19 53 12 12 55 39 48 205 -16 19 34 51 20 11 37 19 6 44 20 40 7 88 0 0 20 9 9 12 55 44 48 206 -17 19 50 46 20 27 35 19 22 36 20 56 7 89 0 0 20 25 25 12 55 49 47 207 -18 20 7 1 20 43 53 19 38 48 21 12 28 90 0 0 20 42 0 12 55 54 46 208 -19 20 23 34 21 0 30 19 55 19 21 29 8 91 0 0 20 58 54 12 55 59 46 209 -20 20 40 27 21 17 26 20 12 9 21 46 7 92 0 0 21 16 7 12 56 3 45 210 -21 20 57 38 21 34 41 20 29 18 22 3 24 93 0 0 21 33 38 12 56 8 44 211 -22 21 15 7 21 52 13 20 46 44 22 20 59 94 0 0 21 51 26 12 56 13 43 212 -23 21 32 53 22 10 3 21 4 28 22 38 52 95 0 0 22 9 31 12 56 17 43 213 -24 21 50 57 22 28 10 21 22 29 22 57 1 96 0 0 22 27 53 12 56 22 42 214 -25 22 9 17 22 46 34 21 40 46 23 15 28 97 0 0 22 46 31 12 56 26 41 215 -26 22 27 53 23 5 14 21 59 20 23 34 11 98 0 0 23 5 25 12 56 30 40 216 -27 22 46 46 23 24 9 22 18 10 23 53 9 99 0 0 23 24 34 12 56 35 39 217 -28 23 5 53 23 43 20 22 37 14 24 12 22 100 0 0 23 43 58 12 56 39 39 218 -28 23 25 15 24 2 46 22 56 34 24 31 51 101 0 0 24 3 36 12 56 43 38 219 -29 23 44 51 24 22 25 23 16 8 24 51 33 102 0 0 24 23 28 12 56 47 37 220 -30 24 4 42 24 42 19 23 35 55 25 11 29 103 0 0 24 43 33 12 56 51 36 220 -31 24 24 45 25 2 25 23 55 56 25 31 38 104 0 0 25 3 50 12 56 55 35 221 -32 24 45 1 25 22 45 24 16 9 25 52 0 105 0 0 25 24 20 12 56 58 34 222 -33 25 5 29 25 43 16 24 36 35 26 12 34 106 0 0 25 45 1 12 57 2 33 223 -34 25 26 8 26 3 59 24 57 12 26 33 19 107 0 0 26 5 53 12 57 6 33 223 -35 25 46 59 26 24 52 25 18 0 26 54 16 108 0 0 26 26 56 12 57 9 32 224 -35 26 8 0 26 45 56 25 38 59 27 15 22 109 0 0 26 48 8 12 57 13 31 225 -36 26 29 11 27 7 10 26 0 8 27 36 38 110 0 0 27 9 30 12 57 16 30 225 -37 26 50 31 27 28 33 26 21 26 27 58 4 111 0 0 27 31 0 12 57 19 29 226 -38 27 12 0 27 50 5 26 42 52 28 19 37 112 0 0 27 52 38 12 57 22 28 227 -39 27 33 37 28 11 45 27 4 27 28 41 19 113 0 0 28 14 24 12 57 25 27 227 -40 27 55 21 28 33 32 27 26 10 29 3 9 114 0 0 28 36 17 12 57 28 26 228 -40 28 17 12 28 55 26 27 47 59 29 25 5 115 0 0 28 58 16 12 57 31 25 229 -41 28 39 10 29 17 26 28 9 55 29 47 7 116 0 0 29 20 20 12 57 34 25 229 -42 29 1 13 29 39 32 28 31 56 30 9 14 117 0 0 29 42 30 12 57 36 24 230 -43 29 23 22 30 1 42 28 54 3 30 31 27 118 0 0 30 4 43 12 57 39 23 231 -43 29 45 34 30 23 57 29 16 14 30 53 43 119 0 0 30 27 1 12 57 41 22 231 -44 30 7 51 30 46 16 29 38 29 31 16 4 120 0 0 30 49 22 12 57 43 21 232 -45 30 30 11 31 8 38 30 0 47 31 38 27 121 0 0 31 11 46 12 57 46 20 232 -45 30 52 34 31 31 2 30 23 9 32 0 53 122 0 0 31 34 11 12 57 48 19 233 -46 31 14 58 31 53 29 30 45 32 32 23 21 123 0 0 31 56 38 12 57 50 18 234 -47 31 37 24 32 15 57 31 7 57 32 45 50 124 0 0 32 19 6 12 57 52 17 234 -47 31 59 51 32 38 25 31 30 22 33 8 20 125 0 0 32 41 34 12 57 54 16 235 -48 32 22 18 33 0 54 31 52 48 33 30 49 126 0 0 33 4 1 12 57 55 15 235 -48 32 44 45 33 23 22 32 15 14 33 53 19 127 0 0 33 26 27 12 57 57 15 236 -49 33 7 11 33 45 49 32 37 39 34 15 46 128 0 0 33 48 52 12 57 58 14 237 -49 33 29 35 34 8 14 33 0 3 34 38 13 129 0 0 34 11 15 12 58 0 13 237 -50 33 51 58 34 30 37 33 22 24 35 0 36 130 0 0 34 33 35 12 58 1 12 238 -50 34 14 17 34 52 57 33 44 43 35 22 57 131 0 0 34 55 52 12 58 2 11 238 -51 34 36 33 35 15 14 34 6 59 35 45 15 132 0 0 35 18 4 12 58 3 10 239 -51 34 58 46 35 37 27 34 29 12 36 7 28 133 0 0 35 40 13 12 58 4 9 240 -52 35 20 54 35 59 36 34 51 20 36 29 37 134 0 0 36 2 16 12 58 5 8 240 -52 35 42 58 36 21 40 35 13 23 36 51 41 135 0 0 36 24 14 12 58 6 7 241 -52 36 4 56 36 43 38 35 35 21 37 13 39 136 0 0 36 46 6 12 58 7 6 241 -53 36 26 48 37 5 30 35 57 13 37 35 31 137 0 0 37 7 52 12 58 7 6 242 -53 36 48 34 37 27 15 36 18 59 37 57 16 138 0 0 37 29 31 12 58 8 5 243 -53 37 10 12 37 48 54 36 40 38 38 18 54 139 0 0 37 51 2 12 58 8 4 243 -54 37 31 44 38 10 25 37 2 10 38 40 25 140 0 0 38 12 25 12 58 9 3 244 -54 37 53 8 38 31 48 37 23 34 39 1 48 141 0 0 38 33 40 12 58 9 2 244 -54 38 14 23 38 53 2 37 44 50 39 23 2 142 0 0 38 54 46 12 58 9 1 245 -54 38 35 30 39 14 8 .. .. .. 39 44 7 143 0 0 39 15 43 12 58 9 0 246 -54 38 56 27 39 35 5 .. .. .. 40 5 2 Uncertainty in time = +/- 3 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 6287-00184-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 04 32.0101 DE: -18 23 18.018 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .032, .023 ) * V mag [mag]: 11.1 * B mag [mag]: 12.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (539) Pamina approx. diameter [km]: 54 approx. diameter ["]: .033 distance from Earth [AU]: 2.24400 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 839 number of rejected observations: 61 time covered by the observations: 1904 Aug 02 - 2008 Sep 18 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.010, 74° remarks: * orbital elements for (539) Pamina : Mean anomaly = 318.77349478 deg Arg. of pericenter = 96.34247440 deg Long. of node = 274.63457471 deg Inclination = 6.80990086 deg Eccentricity = 0.21075609 Semimajor axis = 2.74044887 AU Perihelion dist = 2.16288259 AU Mag: H = 10.00, G = 0.15 Epoch of elements : MJD 54752.53700000 TDT (2008 Oct 13.537) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 13 539 Pamina 12h 53.8m UT 11.1 19 4 32.010-18 23 18.02TYC 6287-00184-1 12.1 14.5 54 2.7 2.244 3.087 5.79 70.2337 -18.389 -16.91 -8.03 12.8962 -0.07398 0.55801 11.20819 1.47704 0.00551 0.00065 2000 318.22231720081011.00000 96.342474274.634575 6.8099010.21075609 2.7404489 2.1628826 9.7 5.00.15 RATE 2.1725590 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.025 87 1.77 0.025 0 54740.5020081013_0184-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 04:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org