IOTA/IOTA-ES occultation update for (49) Pales / TYC 6829-00326-1 event on 2008 May 21, 17:49 UT Visible from Philippines, SE Asia, India Summary ------- On 2008 May 21 UT, the 150 km diameter asteroid (49) Pales will occult a 10.5 mag star in the constellation Ophiuchus for observers along a path across Philippines, SE Asia, India. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.7 mag to 13.1 mag (the magnitude of the asteroid) for at most 11.7 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: 99 * date and approx. time of event: 2008 May 21, 17:42 - 2008 May 21, 17:56 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 2.7 * estimated maximum duration [s]: 11.7 * Moon: 97 % sunlit, 4° distance * Sun: 159° distance * rough path description: Philippines, SE Asia, India The occultation path -------------------- * approximate projected width [km]: 180 * 1 sigma uncertainty interval [path widths]: +/- 0.30 * 1 sigma uncertainty interval [seconds]: +/- 3.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .024", 90° ) * approx speed of asteroid's shadow [km/s]: 12.7682 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6829-00326-1 by 49 Pales on 2008 May 21 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 42 0 0 34 11 33 17 56 17 0 121 -19 .. .. .. 33 14 14 .. .. .. 32 40 12 43 0 0 33 41 15 17 56 17 1 122 -20 34 39 15 32 44 1 35 14 26 32 10 1 44 0 0 33 10 56 17 56 17 2 123 -21 34 8 51 32 13 45 34 44 0 31 39 48 45 0 0 32 40 35 17 56 17 3 123 -22 33 38 26 31 43 29 34 13 31 31 9 34 46 0 0 32 10 13 17 56 16 4 124 -23 33 7 59 31 13 12 33 43 1 30 39 20 47 0 0 31 39 52 17 56 15 5 124 -24 32 37 33 30 42 57 33 12 32 30 9 8 48 0 0 31 9 33 17 56 14 6 125 -25 32 7 8 30 12 43 32 42 3 29 38 57 49 0 0 30 39 16 17 56 13 7 125 -26 31 36 45 29 42 32 32 11 36 29 8 50 50 0 0 30 9 2 17 56 11 8 126 -27 31 6 25 29 12 24 31 41 12 28 38 46 51 0 0 29 38 53 17 56 10 9 126 -27 30 36 9 28 42 22 31 10 52 28 8 47 52 0 0 29 8 50 17 56 8 10 127 -28 30 5 58 28 12 25 30 40 37 27 38 54 53 0 0 28 38 52 17 56 6 11 127 -29 29 35 53 27 42 34 30 10 28 27 9 8 54 0 0 28 9 2 17 56 4 12 128 -30 29 5 55 27 12 51 29 40 25 26 39 29 55 0 0 27 39 19 17 56 2 13 128 -31 28 36 5 26 43 16 29 10 30 26 9 58 56 0 0 27 9 46 17 55 59 14 129 -32 28 6 24 26 13 51 28 40 44 25 40 37 57 0 0 26 40 22 17 55 57 15 129 -33 27 36 52 25 44 35 28 11 7 25 11 26 58 0 0 26 11 10 17 55 54 16 130 -34 27 7 31 25 15 30 27 41 41 24 42 26 59 0 0 25 42 8 17 55 51 17 130 -35 26 38 21 24 46 37 27 12 26 24 13 38 60 0 0 25 13 19 17 55 47 18 131 -36 26 9 23 24 17 57 26 43 23 23 45 2 61 0 0 24 44 44 17 55 44 19 131 -37 25 40 39 23 49 30 26 14 32 23 16 40 62 0 0 24 16 22 17 55 40 20 132 -38 25 12 8 23 21 17 25 45 56 22 48 32 63 0 0 23 48 15 17 55 37 21 132 -39 24 43 52 22 53 19 25 17 34 22 20 39 64 0 0 23 20 23 17 55 33 22 133 -39 24 15 51 22 25 36 24 49 28 21 53 2 65 0 0 22 52 48 17 55 29 23 133 -40 23 48 6 21 58 10 24 21 37 21 25 41 66 0 0 22 25 30 17 55 24 24 134 -41 23 20 38 21 31 0 23 54 4 20 58 37 67 0 0 21 58 29 17 55 20 25 134 -42 22 53 28 21 4 9 23 26 47 20 31 50 68 0 0 21 31 46 17 55 16 26 135 -43 22 26 36 20 37 35 22 59 49 20 5 22 69 0 0 21 5 22 17 55 11 27 135 -44 22 0 3 20 11 21 22 33 10 19 39 13 70 0 0 20 39 18 17 55 6 28 136 -44 21 33 49 19 45 26 22 6 51 19 13 24 71 0 0 20 13 34 17 55 1 29 136 -45 21 7 55 19 19 51 21 40 51 18 47 54 72 0 0 19 48 11 17 54 56 30 137 -46 20 42 22 18 54 37 21 15 12 18 22 45 73 0 0 19 23 9 17 54 50 31 137 -47 20 17 11 18 29 44 20 49 55 17 57 58 74 0 0 18 58 28 17 54 45 32 138 -48 19 52 21 18 5 12 20 24 59 17 33 32 75 0 0 18 34 10 17 54 39 33 139 -48 19 27 53 17 41 3 20 0 25 17 9 28 76 0 0 18 10 14 17 54 34 33 139 -49 19 3 48 17 17 17 19 36 14 16 45 47 77 0 0 17 46 42 17 54 28 34 140 -50 18 40 6 16 53 53 19 12 27 16 22 29 78 0 0 17 23 33 17 54 22 35 140 -50 18 16 48 16 30 54 18 49 3 15 59 34 79 0 0 17 0 49 17 54 16 36 141 -51 17 53 55 16 8 18 18 26 4 15 37 4 80 0 0 16 38 29 17 54 9 37 142 -52 17 31 25 15 46 7 18 3 29 15 14 57 81 0 0 16 16 33 17 54 3 38 142 -52 17 9 21 15 24 20 17 41 19 14 53 16 82 0 0 15 55 3 17 53 56 39 143 -53 16 47 42 15 2 58 17 19 35 14 31 59 83 0 0 15 33 58 17 53 50 40 144 -53 16 26 29 14 42 2 16 58 16 14 11 8 84 0 0 15 13 20 17 53 43 40 144 -54 16 5 41 14 21 32 16 37 23 13 50 43 85 0 0 14 53 7 17 53 36 41 145 -54 15 45 20 14 1 28 16 16 57 13 30 43 86 0 0 14 33 21 17 53 29 42 146 -55 15 25 26 13 41 50 15 56 58 13 11 10 87 0 0 14 14 2 17 53 22 43 147 -55 15 5 59 13 22 38 15 37 25 12 52 3 88 0 0 13 55 10 17 53 15 44 148 -56 14 46 58 13 3 54 15 18 20 12 33 24 89 0 0 13 36 45 17 53 8 44 148 -56 14 28 26 12 45 37 14 59 42 12 15 11 90 0 0 13 18 48 17 53 1 45 149 -56 14 10 20 12 27 47 14 41 32 11 57 25 91 0 0 13 1 18 17 52 53 46 150 -57 13 52 43 12 10 25 14 23 50 11 40 7 92 0 0 12 44 16 17 52 46 46 151 -57 13 35 34 11 53 30 14 6 37 11 23 17 93 0 0 12 27 43 17 52 38 47 152 -57 13 18 53 11 37 3 13 49 51 11 6 54 94 0 0 12 11 37 17 52 31 48 153 -57 13 2 41 11 21 5 13 33 35 10 51 0 95 0 0 11 56 1 17 52 23 49 154 -58 12 46 57 11 5 35 13 17 47 10 35 34 96 0 0 11 40 53 17 52 15 49 155 -58 12 31 43 10 50 33 13 2 28 10 20 36 97 0 0 11 26 13 17 52 8 50 156 -58 12 16 57 10 36 0 12 47 38 10 6 7 98 0 0 11 12 3 17 52 0 50 157 -58 12 2 40 10 21 56 12 33 18 9 52 6 99 0 0 10 58 22 17 51 52 51 158 -58 11 48 53 10 8 21 12 19 27 9 38 34 100 0 0 10 45 10 17 51 44 51 160 -58 11 35 35 9 55 14 12 6 5 9 25 31 101 0 0 10 32 27 17 51 36 52 161 -58 11 22 47 9 42 37 11 53 14 9 12 57 102 0 0 10 20 14 17 51 28 52 162 -58 11 10 28 9 30 29 11 40 52 9 0 52 103 0 0 10 8 30 17 51 20 53 163 -57 10 58 39 9 18 51 11 28 59 8 49 17 104 0 0 9 57 16 17 51 12 53 165 -57 10 47 20 9 7 41 11 17 37 8 38 10 105 0 0 9 46 32 17 51 3 54 166 -57 10 36 31 8 57 2 11 6 45 8 27 33 106 0 0 9 36 17 17 50 55 54 167 -57 10 26 12 8 46 52 10 56 23 8 17 26 107 0 0 9 26 32 17 50 47 55 169 -57 10 16 23 8 37 11 10 46 31 8 7 48 108 0 0 9 17 18 17 50 39 55 170 -56 10 7 4 8 28 0 10 37 10 7 58 39 109 0 0 9 8 33 17 50 30 55 172 -56 9 58 15 8 19 20 10 28 19 7 50 1 110 0 0 9 0 18 17 50 22 55 173 -56 9 49 57 8 11 8 10 19 58 7 41 52 111 0 0 8 52 34 17 50 14 56 175 -55 9 42 9 8 3 27 10 12 8 7 34 13 112 0 0 8 45 19 17 50 6 56 176 -55 9 34 51 7 56 16 10 4 48 7 27 3 113 0 0 8 38 35 17 49 57 56 178 -54 9 28 4 7 49 35 9 57 59 7 20 24 114 0 0 8 32 21 17 49 49 56 179 -54 9 21 47 7 43 24 9 51 41 7 14 14 115 0 0 8 26 38 17 49 40 56 181 -53 9 16 1 7 37 43 9 45 53 7 8 34 116 0 0 8 21 24 17 49 32 56 183 -53 9 10 45 7 32 32 9 40 36 7 3 25 117 0 0 8 16 42 17 49 24 56 184 -52 9 6 1 7 27 51 9 35 50 6 58 45 118 0 0 8 12 29 17 49 15 56 186 -52 9 1 46 7 23 40 9 31 34 6 54 36 119 0 0 8 8 47 17 49 7 56 187 -51 8 58 3 7 20 0 9 27 50 6 50 56 120 0 0 8 5 36 17 48 59 56 189 -50 8 54 50 7 16 49 9 24 36 6 47 47 121 0 0 8 2 55 17 48 50 56 190 -50 8 52 7 7 14 10 9 21 53 6 45 7 122 0 0 8 0 44 17 48 42 56 192 -49 8 49 56 7 12 0 9 19 41 6 42 58 123 0 0 7 59 4 17 48 34 56 193 -48 8 48 15 7 10 21 9 18 0 6 41 19 124 0 0 7 57 54 17 48 26 55 195 -48 8 47 5 7 9 11 9 16 50 6 40 10 125 0 0 7 57 15 17 48 17 55 196 -47 8 46 26 7 8 33 9 16 10 6 39 32 126 0 0 7 57 7 17 48 9 55 198 -46 8 46 18 7 8 24 9 16 2 6 39 23 127 0 0 7 57 29 17 48 1 55 199 -46 8 46 40 7 8 46 9 16 25 6 39 45 128 0 0 7 58 22 17 47 53 54 201 -45 8 47 34 7 9 39 9 17 18 6 40 37 129 0 0 7 59 46 17 47 45 54 202 -44 8 48 58 7 11 1 9 18 43 6 42 0 130 0 0 8 1 40 17 47 37 54 203 -43 8 50 53 7 12 54 9 20 39 6 43 52 131 0 0 8 4 4 17 47 28 53 205 -43 8 53 19 7 15 18 9 23 5 6 46 15 132 0 0 8 7 0 17 47 20 53 206 -42 8 56 15 7 18 12 9 26 3 6 49 8 133 0 0 8 10 25 17 47 12 52 207 -41 8 59 43 7 21 36 9 29 31 6 52 31 134 0 0 8 14 22 17 47 5 52 208 -40 9 3 41 7 25 31 9 33 31 6 56 25 135 0 0 8 18 49 17 46 57 51 209 -39 9 8 10 7 29 56 9 38 2 7 0 49 136 0 0 8 23 47 17 46 49 51 211 -38 9 13 11 7 34 51 9 43 3 7 5 43 137 0 0 8 29 15 17 46 41 50 212 -38 9 18 41 7 40 17 9 48 36 7 11 7 138 0 0 8 35 14 17 46 33 49 213 -37 9 24 43 7 46 13 9 54 39 7 17 1 139 0 0 8 41 43 17 46 26 49 214 -36 9 31 16 7 52 39 10 1 13 7 23 26 140 0 0 8 48 43 17 46 18 48 215 -35 9 38 19 7 59 36 10 8 19 7 30 21 141 0 0 8 56 14 17 46 11 48 216 -34 9 45 53 8 7 3 10 15 55 7 37 46 142 0 0 9 4 14 17 46 3 47 216 -33 9 53 58 8 15 0 10 24 2 7 45 41 143 0 0 9 12 46 17 45 56 46 217 -32 10 2 33 8 23 28 10 32 40 7 54 6 144 0 0 9 21 48 17 45 49 45 218 -31 10 11 39 8 32 25 10 41 48 8 3 1 145 0 0 9 31 20 17 45 41 45 219 -31 10 21 16 8 41 53 10 51 28 8 12 26 146 0 0 9 41 22 17 45 34 44 220 -30 10 31 23 8 51 51 11 1 38 8 22 22 147 0 0 9 51 55 17 45 27 43 220 -29 10 42 1 9 2 19 11 12 19 8 32 47 148 0 0 10 2 58 17 45 20 43 221 -28 10 53 9 9 13 17 11 23 30 8 43 42 149 0 0 10 14 31 17 45 13 42 222 -27 11 4 47 9 24 45 11 35 12 8 55 7 150 0 0 10 26 34 17 45 7 41 223 -26 11 16 56 9 36 43 11 47 24 9 7 1 151 0 0 10 39 7 17 45 0 40 223 -25 11 29 35 9 49 10 12 0 6 9 19 26 152 0 0 10 52 10 17 44 53 39 224 -24 11 42 44 10 2 7 12 13 19 9 32 19 153 0 0 11 5 43 17 44 47 39 224 -23 11 56 23 10 15 34 12 27 2 9 45 43 154 0 0 11 19 46 17 44 41 38 225 -22 12 10 32 10 29 31 12 41 15 9 59 36 155 0 0 11 34 18 17 44 34 37 226 -21 12 25 11 10 43 56 12 55 58 10 13 58 156 0 0 11 49 20 17 44 28 36 226 -20 12 40 19 10 58 51 13 11 11 10 28 49 157 0 0 12 4 51 17 44 22 35 227 -19 12 55 58 11 14 16 13 26 53 10 44 9 158 0 0 12 20 51 17 44 16 34 227 -18 13 12 5 11 30 9 13 43 5 10 59 58 159 0 0 12 37 20 17 44 11 33 228 -17 13 28 42 11 46 31 13 59 46 11 16 16 160 0 0 12 54 19 17 44 5 32 228 -16 13 45 47 12 3 22 14 16 57 11 33 2 161 0 0 13 11 45 17 43 59 32 229 -15 14 3 22 12 20 41 14 34 36 11 50 17 162 0 0 13 29 41 17 43 54 31 229 -14 14 21 25 12 38 29 14 52 45 12 8 1 163 0 0 13 48 4 17 43 49 30 230 -13 14 39 57 12 56 45 15 11 21 12 26 12 164 0 0 14 6 56 17 43 44 29 230 -12 14 58 57 13 15 28 15 30 26 12 44 51 165 0 0 14 26 16 17 43 39 28 231 -11 15 18 25 13 34 40 15 50 0 13 3 57 166 0 0 14 46 3 17 43 34 27 231 -10 15 38 21 13 54 19 16 10 1 13 23 31 167 0 0 15 6 17 17 43 29 26 231 -9 15 58 44 14 14 25 16 30 29 13 43 32 168 0 0 15 26 59 17 43 25 25 232 -8 16 19 35 14 34 57 16 51 25 14 4 0 169 0 0 15 48 7 17 43 20 24 232 -7 16 40 52 14 55 57 17 12 48 14 24 55 170 0 0 16 9 42 17 43 16 23 233 -6 17 2 36 15 17 23 17 34 37 14 46 15 171 0 0 16 31 42 17 43 12 22 233 -5 17 24 46 15 39 15 17 56 53 15 8 2 172 0 0 16 54 9 17 43 8 21 233 -4 17 47 21 16 1 32 18 19 35 15 30 14 173 0 0 17 17 1 17 43 4 20 234 -3 18 10 22 16 24 14 18 42 42 15 52 51 174 0 0 17 40 17 17 43 1 19 234 -2 18 33 49 16 47 22 19 6 14 16 15 53 175 0 0 18 3 58 17 42 57 18 235 -1 18 57 39 17 10 54 19 30 10 16 39 20 176 0 0 18 28 3 17 42 54 17 235 0 19 21 54 17 34 50 19 54 31 17 3 10 Uncertainty in time = +/- 4 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: TYC 6829-00326-1 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 25 41.1424 DE: -25 22 52.010 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 10.5 * B mag [mag]: 12.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (49) Pales approx. diameter [km]: 150 approx. diameter ["]: .080 distance from Earth [AU]: 2.59300 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 888 number of rejected observations: 173 time covered by the observations: 1908 Jan 13 - 2008 Apr 04 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.012, 89° remarks: * orbital elements for (49) Pales : Mean anomaly = 239.65904496 deg Arg. of pericenter = 110.04754288 deg Long. of node = 286.13014970 deg Inclination = 3.18148119 deg Eccentricity = 0.23132551 Semimajor axis = 3.09055836 AU Perihelion dist = 2.37563337 AU Mag: H = 7.61, G = 0.15 Epoch of elements : MJD 54607.74300000 TDT (2008 May 21.743) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 21 49 Pales 17h 49.4m UT 10.5 17 25 41.142-25 22 52.01TYC 6829-00326-1 12.0 13.1 150 11.7 2.593 -1.798 2.03 114.3372 -25.381 -88.18 20.37 17.8229 0.04635 0.55292 -7.18182 0.59857 -0.00207 0.00033 2000 238.2544282008 514.00000110.047543286.130150 3.1814810.23132551 3.0905584 2.3756334 7.8 5.00.15 RATE 1.8140480 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.026 0.024 90 1.30 0.024 0 54594.5020080521_0326-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org