IOTA/IOTA-ES occultation update for (191) Kolga / 2UCAC 36961976 event on 2008 Mar 26, 11:33 UT Visible from Japan, China Summary ------- On 2008 Mar 26 UT, the 101 km diameter asteroid (191) Kolga will occult a 12.5 mag star in the constellation Orion for observers along a path across Japan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 14.5 mag (the magnitude of the asteroid) for at most 5.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 91 * date and approx. time of event: 2008 Mar 26, 11:30 - 2008 Mar 26, 11:35 UT * magnitude of target star: 12.5 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 5.2 * Moon: 80 % sunlit, 143° distance * Sun: 87° distance * rough path description: Japan, China The occultation path -------------------- * approximate projected width [km]: 103 * 1 sigma uncertainty interval [path widths]: +/- 0.52 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .026", 89° ) * approx speed of asteroid's shadow [km/s]: 19.3708 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 36961976 by 191 Kolga on 2008 Mar 26 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 101 0 0 28 33 31 11 30 27 75 200 -1 28 4 25 29 2 39 27 34 12 29 33 2 102 0 0 28 48 54 11 30 33 75 204 -2 28 19 51 29 18 1 27 49 42 29 48 20 103 0 0 29 3 58 11 30 38 74 207 -3 28 34 58 29 33 1 28 4 51 30 3 18 104 0 0 29 18 41 11 30 43 74 209 -3 28 49 43 29 47 41 28 19 39 30 17 55 105 0 0 29 33 3 11 30 48 73 212 -4 29 4 8 30 2 1 28 34 7 30 32 12 106 0 0 29 47 4 11 30 53 72 215 -5 29 18 12 30 16 0 28 48 14 30 46 8 107 0 0 30 0 45 11 30 59 71 217 -6 29 31 56 30 29 38 29 2 0 30 59 43 108 0 0 30 14 5 11 31 4 71 219 -7 29 45 18 30 42 55 29 15 25 31 12 58 109 0 0 30 27 4 11 31 9 70 221 -8 29 58 19 30 55 51 29 28 29 31 25 51 110 0 0 30 39 42 11 31 14 69 223 -9 30 11 0 31 8 27 29 41 12 31 38 24 111 0 0 30 51 59 11 31 19 69 225 -9 30 23 19 31 20 41 29 53 34 31 50 36 112 0 0 31 3 54 11 31 23 68 227 -10 30 35 17 31 32 34 30 5 35 32 2 26 113 0 0 31 15 29 11 31 28 67 228 -11 30 46 55 31 44 7 30 17 14 32 13 56 114 0 0 31 26 43 11 31 33 66 230 -12 30 58 10 31 55 18 30 28 33 32 25 5 115 0 0 31 37 35 11 31 38 65 231 -13 31 9 5 32 6 8 30 39 30 32 35 53 116 0 0 31 48 6 11 31 43 65 233 -14 31 19 39 32 16 37 30 50 5 32 46 19 117 0 0 31 58 16 11 31 47 64 234 -14 31 29 51 32 26 45 31 0 20 32 56 25 118 0 0 32 8 5 11 31 52 63 235 -15 31 39 42 32 36 31 31 10 13 33 6 9 119 0 0 32 17 33 11 31 56 62 236 -16 31 49 11 32 45 57 31 19 45 33 15 33 120 0 0 32 26 39 11 32 1 61 238 -17 31 58 20 32 55 1 31 28 55 33 24 35 121 0 0 32 35 24 11 32 6 61 239 -18 32 7 7 33 3 45 31 37 44 33 33 16 122 0 0 32 43 48 11 32 10 60 240 -18 32 15 32 33 12 7 31 46 12 33 41 36 123 0 0 32 51 51 11 32 14 59 241 -19 32 23 37 33 20 8 31 54 18 33 49 35 124 0 0 32 59 32 11 32 19 58 242 -20 32 31 20 33 27 47 32 2 3 33 57 13 125 0 0 33 6 53 11 32 23 57 243 -21 32 38 42 33 35 6 32 9 27 34 4 30 126 0 0 33 13 52 11 32 27 57 244 -21 32 45 43 33 42 4 32 16 29 34 11 26 127 0 0 33 20 30 11 32 31 56 245 -22 32 52 22 33 48 40 32 23 10 34 18 1 128 0 0 33 26 47 11 32 36 55 246 -23 32 58 41 33 54 56 32 29 30 34 24 15 129 0 0 33 32 42 11 32 40 54 247 -24 33 4 38 34 0 50 32 35 29 34 30 8 130 0 0 33 38 17 11 32 44 53 248 -25 33 10 14 34 6 23 32 41 6 34 35 40 131 0 0 33 43 31 11 32 48 53 249 -25 33 15 28 34 11 36 32 46 22 34 40 51 132 0 0 33 48 23 11 32 52 52 249 -26 33 20 22 34 16 27 32 51 16 34 45 41 133 0 0 33 52 54 11 32 55 51 250 -27 33 24 54 34 20 57 32 55 50 34 50 10 134 0 0 33 57 5 11 32 59 50 251 -28 33 29 6 34 25 7 33 0 2 34 54 19 135 0 0 34 0 54 11 33 3 49 252 -28 33 32 56 34 28 55 33 3 53 34 58 6 136 0 0 34 4 22 11 33 7 48 253 -29 33 36 25 34 32 23 33 7 23 35 1 33 137 0 0 34 7 30 11 33 11 48 253 -30 33 39 33 34 35 29 33 10 32 35 4 39 138 0 0 34 10 16 11 33 14 47 254 -30 33 42 20 34 38 15 33 13 20 35 7 24 139 0 0 34 12 42 11 33 18 46 255 -31 33 44 46 34 40 40 33 15 46 35 9 48 140 0 0 34 14 46 11 33 21 45 256 -32 33 46 51 34 42 44 33 17 52 35 11 52 141 0 0 34 16 30 11 33 25 44 256 -33 33 48 35 34 44 27 33 19 36 35 13 35 142 0 0 34 17 53 11 33 28 44 257 -33 33 49 58 34 45 50 33 21 0 35 14 57 143 0 0 34 18 54 11 33 32 43 258 -34 33 51 0 34 46 51 33 22 2 35 15 58 144 0 0 34 19 35 11 33 35 42 259 -35 33 51 41 34 47 32 33 22 43 35 16 39 145 0 0 34 19 56 11 33 38 41 259 -35 33 52 2 34 47 52 33 23 3 35 16 59 146 0 0 34 19 55 11 33 41 40 260 -36 33 52 1 34 47 52 33 23 3 35 16 59 147 0 0 34 19 33 11 33 44 39 261 -37 33 51 39 34 47 30 33 22 41 35 16 37 148 0 0 34 18 51 11 33 48 39 261 -38 33 50 57 34 46 48 33 21 58 35 15 55 149 0 0 34 17 48 11 33 51 38 262 -38 33 49 53 34 45 45 33 20 55 35 14 53 150 0 0 34 16 24 11 33 54 37 263 -39 33 48 29 34 44 22 33 19 30 35 13 30 151 0 0 34 14 40 11 33 57 36 263 -40 33 46 44 34 42 38 33 17 44 35 11 46 152 0 0 34 12 34 11 33 59 35 264 -40 33 44 38 34 40 33 33 15 38 35 9 42 153 0 0 34 10 8 11 34 2 34 265 -41 33 42 12 34 38 8 33 13 11 35 7 17 154 0 0 34 7 21 11 34 5 34 265 -42 33 39 24 34 35 21 33 10 22 35 4 32 155 0 0 34 4 14 11 34 8 33 266 -42 33 36 16 34 32 15 33 7 13 35 1 26 156 0 0 34 0 46 11 34 10 32 267 -43 33 32 47 34 28 47 33 3 43 34 57 59 157 0 0 33 56 57 11 34 13 31 267 -44 33 28 57 34 24 59 32 59 52 34 54 12 158 0 0 33 52 47 11 34 15 30 268 -44 33 24 46 34 20 51 32 55 41 34 50 5 159 0 0 33 48 17 11 34 18 29 269 -45 33 20 15 34 16 21 32 51 8 34 45 37 160 0 0 33 43 26 11 34 20 29 269 -45 33 15 22 34 11 31 32 46 15 34 40 48 161 0 0 33 38 14 11 34 23 28 270 -46 33 10 10 34 6 21 32 41 1 34 35 39 162 0 0 33 32 42 11 34 25 27 270 -47 33 4 36 34 0 50 32 35 26 34 30 9 163 0 0 33 26 49 11 34 27 26 271 -47 32 58 42 33 54 58 32 29 30 34 24 19 164 0 0 33 20 35 11 34 29 25 272 -48 32 52 27 33 48 46 32 23 13 34 18 8 165 0 0 33 14 1 11 34 31 24 272 -48 32 45 51 33 42 14 32 16 36 34 11 37 166 0 0 33 7 6 11 34 33 24 273 -49 32 38 54 33 35 20 32 9 38 34 4 46 167 0 0 32 59 51 11 34 35 23 273 -50 32 31 37 33 28 7 32 2 19 33 57 34 168 0 0 32 52 15 11 34 37 22 274 -50 32 24 0 33 20 32 31 54 40 33 50 1 169 0 0 32 44 18 11 34 39 21 274 -51 32 16 1 33 12 38 31 46 40 33 42 8 170 0 0 32 36 1 11 34 41 20 275 -51 32 7 43 33 4 22 31 38 19 33 33 55 171 0 0 32 27 23 11 34 43 19 276 -52 31 59 3 32 55 47 31 29 38 33 25 22 172 0 0 32 18 25 11 34 44 18 276 -52 31 50 3 32 46 51 31 20 36 33 16 27 173 0 0 32 9 7 11 34 46 18 277 -53 31 40 43 32 37 34 31 11 13 33 7 13 174 0 0 31 59 28 11 34 47 17 277 -53 31 31 2 32 27 57 31 1 30 32 57 38 175 0 0 31 49 29 11 34 49 16 278 -54 31 21 0 32 18 0 30 51 27 32 47 44 176 0 0 31 39 9 11 34 50 15 278 -54 31 10 39 32 7 43 30 41 3 32 37 28 177 0 0 31 28 29 11 34 51 14 279 -55 30 59 57 31 57 5 30 30 18 32 26 53 178 0 0 31 17 29 11 34 53 13 279 -55 30 48 54 31 46 7 30 19 14 32 15 57 179 0 0 31 6 9 11 34 54 12 280 -56 30 37 32 31 34 49 30 7 49 32 4 42 180 0 0 30 54 28 11 34 55 11 280 -56 30 25 49 31 23 11 29 56 3 31 53 6 -179 0 0 30 42 28 11 34 56 11 281 -56 30 13 46 31 11 13 29 43 58 31 41 10 -178 0 0 30 30 7 11 34 57 10 281 -57 30 1 23 30 58 55 29 31 33 31 28 55 -177 0 0 30 17 27 11 34 58 9 282 -57 29 48 40 30 46 17 29 18 47 31 16 19 -176 0 0 30 4 27 11 34 58 8 282 -57 29 35 37 30 33 19 29 5 42 31 3 24 -175 0 0 29 51 7 11 34 59 7 283 -58 29 22 15 30 20 1 28 52 17 30 50 9 -174 0 0 29 37 27 11 35 0 6 283 -58 29 8 33 30 6 24 28 38 32 30 36 34 -173 0 0 29 23 28 11 35 0 5 284 -58 28 54 31 29 52 27 28 24 28 30 22 40 -172 0 0 29 9 9 11 35 1 4 284 -58 28 40 10 29 38 11 28 10 4 30 8 27 -171 0 0 28 54 31 11 35 1 3 285 -59 28 25 29 29 23 36 27 55 21 29 53 54 -170 0 0 28 39 33 11 35 1 2 285 -59 28 10 29 29 8 41 27 40 18 29 39 2 -169 0 0 28 24 17 11 35 2 2 286 -59 27 55 10 28 53 27 27 24 57 29 23 51 -168 0 0 28 8 42 11 35 2 1 286 -59 27 39 32 28 37 54 27 9 16 29 8 21 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 12.0] Data for the target star ------------------------ * name: 2UCAC 36961976 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 10 30.6347 DE: +14 41 18.525 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .024 ) * V mag [mag]: 12.5 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (191) Kolga approx. diameter [km]: 101 approx. diameter ["]: .051 distance from Earth [AU]: 2.72800 * orbital information: orbit source: Preston date of fit: 2008 Mar 12 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 894 number of rejected observations: 92 time covered by the observations: 1902 Jul 09 - 2008 Feb 13 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.010, 85° remarks: * orbital elements for (191) Kolga : Mean anomaly = 74.38195134 deg Arg. of pericenter = 228.74117693 deg Long. of node = 159.45533583 deg Inclination = 11.50757585 deg Eccentricity = 0.08931880 Semimajor axis = 2.89590991 AU Perihelion dist = 2.63725071 AU Mag: H = 8.89, G = 0.15 Epoch of elements : MJD 54551.48100000 TDT (2008 Mar 26.481) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 26 191 Kolga 11h 29.7m UT 12.5 6 10 30.635 14 41 18.522UCAC 36961976 0.0 14.5 101 5.2 2.728 2.322 10.33 95.9312 14.686 8.98 2.46 11.4942 -0.06117 0.19475 10.45271 3.20637 0.00576 -0.00015 2000 74.0857532008 325.00000228.741177159.455336 11.5075760.08931880 2.8959099 2.6372507 9.1 5.00.15 RATE 1.9999840 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.028 0.026 89 1.52 0.026 0 54537.5020080326_961976 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 12, 23:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org