IOTA/IOTA-ES occultation update for (276) Adelheid / UCAC2 31676012 event on 2008 May 09, 09:24 UT Visible from SE Australia Summary ------- On 2008 May 09 UT, the 122 km diameter asteroid (276) Adelheid will occult a 11.8 mag star in the constellation Hydra for observers along a path across SE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.5 mag to 14.2 mag (the magnitude of the asteroid) for at most 4.8 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: 59 * date and approx. time of event: 2008 May 09, 09:24 - 2008 May 09, 09:28 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 2.5 * estimated maximum duration [s]: 4.8 * Moon: 20 % sunlit, 33° distance * Sun: 79° distance * rough path description: SE Australia The occultation path -------------------- * approximate projected width [km]: 162 * 1 sigma uncertainty interval [path widths]: +/- 1.04 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .050 +/- .060) * 1 sigma uncertainty ellipse (major, minor, PA): ( .060", .050", 0° ) * approx speed of asteroid's shadow [km/s]: 25.1346 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 31676012 by 276 Adelheid on 2008 May 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 111 0 0 -43 36 52 9 24 10 46 7 0 -44 22 33 -42 51 44 -45 59 24 -41 19 29 112 0 0 -43 25 40 9 24 13 47 6 -1 -44 11 21 -42 40 31 -45 48 14 -41 8 15 113 0 0 -43 14 24 9 24 17 47 5 -1 -44 0 5 -42 29 15 -45 36 59 -40 56 58 114 0 0 -43 3 5 9 24 20 47 3 -2 -43 48 47 -42 17 56 -45 25 41 -40 45 38 115 0 0 -42 51 43 9 24 23 47 2 -3 -43 37 25 -42 6 33 -45 14 20 -40 34 15 116 0 0 -42 40 18 9 24 27 48 0 -3 -43 26 1 -41 55 8 -45 2 57 -40 22 49 117 0 0 -42 28 51 9 24 30 48 359 -4 -43 14 34 -41 43 41 -44 51 30 -40 11 21 118 0 0 -42 17 22 9 24 33 48 357 -5 -43 3 4 -41 32 11 -44 40 1 -39 59 51 119 0 0 -42 5 50 9 24 37 48 355 -5 -42 51 33 -41 20 40 -44 28 30 -39 48 20 120 0 0 -41 54 17 9 24 40 48 354 -6 -42 40 0 -41 9 6 -44 16 57 -39 36 46 121 0 0 -41 42 42 9 24 44 48 352 -6 -42 28 25 -40 57 32 -44 5 22 -39 25 11 122 0 0 -41 31 6 9 24 47 48 351 -7 -42 16 49 -40 45 56 -43 53 46 -39 13 35 123 0 0 -41 19 29 9 24 51 49 349 -8 -42 5 12 -40 34 19 -43 42 9 -39 1 59 124 0 0 -41 7 51 9 24 54 49 348 -9 -41 53 34 -40 22 41 -43 30 30 -38 50 21 125 0 0 -40 56 13 9 24 58 49 346 -9 -41 41 55 -40 11 3 -43 18 51 -38 38 44 126 0 0 -40 44 34 9 25 1 49 345 -10 -41 30 16 -39 59 24 -43 7 12 -38 27 6 127 0 0 -40 32 55 9 25 5 49 343 -11 -41 18 37 -39 47 46 -42 55 32 -38 15 28 128 0 0 -40 21 17 9 25 8 48 341 -11 -41 6 58 -39 36 8 -42 43 52 -38 3 50 129 0 0 -40 9 39 9 25 12 48 340 -12 -40 55 20 -39 24 30 -42 32 12 -37 52 14 130 0 0 -39 58 1 9 25 15 48 338 -13 -40 43 42 -39 12 53 -42 20 34 -37 40 38 131 0 0 -39 46 25 9 25 19 48 337 -13 -40 32 5 -39 1 18 -42 8 55 -37 29 3 132 0 0 -39 34 50 9 25 22 48 335 -14 -40 20 29 -38 49 43 -41 57 18 -37 17 30 133 0 0 -39 23 16 9 25 26 48 334 -15 -40 8 55 -38 38 10 -41 45 43 -37 5 58 134 0 0 -39 11 45 9 25 29 48 332 -16 -39 57 23 -38 26 39 -41 34 9 -36 54 28 135 0 0 -39 0 15 9 25 33 48 331 -16 -39 45 52 -38 15 10 -41 22 37 -36 43 1 136 0 0 -38 48 48 9 25 37 47 329 -17 -39 34 24 -38 3 43 -41 11 7 -36 31 36 137 0 0 -38 37 23 9 25 40 47 328 -18 -39 22 58 -37 52 19 -40 59 39 -36 20 13 138 0 0 -38 26 1 9 25 44 47 326 -19 -39 11 35 -37 40 58 -40 48 14 -36 8 54 139 0 0 -38 14 42 9 25 47 46 325 -19 -39 0 16 -37 29 40 -40 36 52 -35 57 38 140 0 0 -38 3 26 9 25 51 46 323 -20 -38 48 59 -37 18 26 -40 25 34 -35 46 25 141 0 0 -37 52 15 9 25 54 46 322 -21 -38 37 46 -37 7 15 -40 14 18 -35 35 16 142 0 0 -37 41 7 9 25 58 45 321 -22 -38 26 37 -36 56 8 -40 3 7 -35 24 11 143 0 0 -37 30 3 9 26 1 45 319 -23 -38 15 32 -36 45 5 -39 52 0 -35 13 11 144 0 0 -37 19 3 9 26 5 45 318 -23 -38 4 32 -36 34 7 -39 40 57 -35 2 15 145 0 0 -37 8 9 9 26 8 44 317 -24 -37 53 36 -36 23 14 -39 29 58 -34 51 23 146 0 0 -36 57 19 9 26 11 44 315 -25 -37 42 45 -36 12 25 -39 19 5 -34 40 37 147 0 0 -36 46 35 9 26 15 43 314 -26 -37 31 59 -36 1 42 -39 8 16 -34 29 56 148 0 0 -36 35 56 9 26 18 43 313 -27 -37 21 19 -35 51 4 -38 57 33 -34 19 21 149 0 0 -36 25 22 9 26 21 42 312 -27 -37 10 44 -35 40 32 -38 46 55 -34 8 51 150 0 0 -36 14 55 9 26 25 42 310 -28 -37 0 16 -35 30 6 -38 36 24 -33 58 28 151 0 0 -36 4 34 9 26 28 41 309 -29 -36 49 53 -35 19 46 -38 25 58 -33 48 11 152 0 0 -35 54 19 9 26 31 41 308 -30 -36 39 37 -35 9 33 -38 15 39 -33 38 0 153 0 0 -35 44 11 9 26 35 40 307 -31 -36 29 28 -34 59 26 -38 5 27 -33 27 56 154 0 0 -35 34 10 9 26 38 40 306 -31 -36 19 25 -34 49 26 -37 55 21 -33 17 59 155 0 0 -35 24 16 9 26 41 39 305 -32 -36 9 30 -34 39 34 -37 45 22 -33 8 9 156 0 0 -35 14 29 9 26 44 39 304 -33 -35 59 42 -34 29 49 -37 35 31 -32 58 27 157 0 0 -35 4 51 9 26 47 38 303 -34 -35 50 1 -34 20 11 -37 25 48 -32 48 52 158 0 0 -34 55 20 9 26 50 37 302 -35 -35 40 29 -34 10 42 -37 16 12 -32 39 25 159 0 0 -34 45 57 9 26 53 37 301 -36 -35 31 5 -34 1 20 -37 6 44 -32 30 7 160 0 0 -34 36 42 9 26 56 36 300 -36 -35 21 49 -33 52 7 -36 57 25 -32 20 57 161 0 0 -34 27 36 9 26 59 35 299 -37 -35 12 41 -33 43 3 -36 48 14 -32 11 55 162 0 0 -34 18 39 9 27 2 35 298 -38 -35 3 42 -33 34 7 -36 39 12 -32 3 2 163 0 0 -34 9 51 9 27 5 34 297 -39 -34 54 53 -33 25 20 -36 30 19 -31 54 18 164 0 0 -34 1 12 9 27 8 33 296 -40 -34 46 12 -33 16 42 -36 21 35 -31 45 43 165 0 0 -33 52 42 9 27 10 33 295 -41 -34 37 41 -33 8 14 -36 13 0 -31 37 18 166 0 0 -33 44 22 9 27 13 32 294 -41 -34 29 19 -32 59 55 -36 4 35 -31 29 2 167 0 0 -33 36 11 9 27 16 31 293 -42 -34 21 7 -32 51 46 -35 56 20 -31 20 56 168 0 0 -33 28 10 9 27 18 31 292 -43 -34 13 5 -32 43 47 -35 48 15 -31 12 59 169 0 0 -33 20 20 9 27 21 30 292 -44 -34 5 13 -32 35 58 -35 40 20 -31 5 13 170 0 0 -33 12 40 9 27 23 29 291 -45 -33 57 31 -32 28 19 -35 32 35 -30 57 37 171 0 0 -33 5 10 9 27 26 28 290 -46 -33 50 0 -32 20 51 -35 25 1 -30 50 12 172 0 0 -32 57 51 9 27 28 28 289 -47 -33 42 40 -32 13 33 -35 17 37 -30 42 57 173 0 0 -32 50 43 9 27 30 27 289 -47 -33 35 30 -32 6 27 -35 10 24 -30 35 53 174 0 0 -32 43 46 9 27 33 26 288 -48 -33 28 32 -31 59 31 -35 3 23 -30 29 0 175 0 0 -32 37 0 9 27 35 25 287 -49 -33 21 44 -31 52 46 -34 56 32 -30 22 18 176 0 0 -32 30 25 9 27 37 24 286 -50 -33 15 8 -31 46 12 -34 49 53 -30 15 47 177 0 0 -32 24 1 9 27 39 24 286 -51 -33 8 43 -31 39 50 -34 43 25 -30 9 27 178 0 0 -32 17 50 9 27 41 23 285 -52 -33 2 30 -31 33 40 -34 37 9 -30 3 19 179 0 0 -32 11 49 9 27 43 22 284 -53 -32 56 28 -31 27 41 -34 31 5 -29 57 23 180 0 0 -32 6 1 9 27 45 21 284 -53 -32 50 39 -31 21 54 -34 25 12 -29 51 38 -179 0 0 -32 0 25 9 27 47 21 283 -54 -32 45 1 -31 16 18 -34 19 32 -29 46 5 -178 0 0 -31 55 0 9 27 48 20 282 -55 -32 39 36 -31 10 55 -34 14 4 -29 40 44 -177 0 0 -31 49 48 9 27 50 19 282 -56 -32 34 22 -31 5 44 -34 8 48 -29 35 35 -176 0 0 -31 44 48 9 27 52 18 281 -57 -32 29 21 -31 0 45 -34 3 44 -29 30 39 -175 0 0 -31 40 1 9 27 53 17 281 -58 -32 24 33 -30 55 59 -33 58 53 -29 25 54 -174 0 0 -31 35 26 9 27 55 16 280 -59 -32 19 56 -30 51 25 -33 54 15 -29 21 22 -173 0 0 -31 31 3 9 27 56 16 279 -59 -32 15 33 -30 47 3 -33 49 49 -29 17 3 -172 0 0 -31 26 53 9 27 57 15 279 -60 -32 11 22 -30 42 54 -33 45 36 -29 12 56 -171 0 0 -31 22 56 9 27 59 14 278 -61 -32 7 24 -30 38 58 -33 41 36 -29 9 1 -170 0 0 -31 19 12 9 28 0 13 278 -62 -32 3 39 -30 35 15 -33 37 49 -29 5 20 -169 0 0 -31 15 41 9 28 1 12 277 -63 -32 0 7 -30 31 45 -33 34 15 -29 1 51 -168 0 0 -31 12 22 9 28 2 11 277 -63 -31 56 48 -30 28 27 -33 30 54 -28 58 35 -167 0 0 -31 9 17 9 28 3 11 276 -64 -31 53 42 -30 25 22 -33 27 46 -28 55 32 -166 0 0 -31 6 25 9 28 4 10 276 -65 -31 50 49 -30 22 31 -33 24 52 -28 52 42 -165 0 0 -31 3 46 9 28 5 9 275 -66 -31 48 9 -30 19 52 -33 22 10 -28 50 5 -164 0 0 -31 1 20 9 28 5 8 274 -67 -31 45 42 -30 17 27 -33 19 42 -28 47 41 -163 0 0 -30 59 7 9 28 6 7 274 -67 -31 43 29 -30 15 15 -33 17 28 .. .. .. -162 0 0 -30 57 8 9 28 7 6 273 -68 -31 41 29 -30 13 16 -33 15 26 .. .. .. -161 0 0 -30 55 22 9 28 7 5 273 -69 -31 39 42 -30 11 31 -33 13 39 .. .. .. -160 0 0 -30 53 49 9 28 8 5 272 -69 -31 38 9 -30 9 58 -33 12 4 .. .. .. -159 0 0 -30 52 29 9 28 8 4 272 -70 -31 36 49 -30 8 39 -33 10 44 .. .. .. -158 0 0 -30 51 23 9 28 8 3 271 -71 -31 35 43 -30 7 33 -33 9 36 .. .. .. -157 0 0 -30 50 31 9 28 9 2 271 -71 -31 34 50 -30 6 41 -33 8 43 .. .. .. -156 0 0 -30 49 51 9 28 9 1 270 -72 -31 34 10 -30 6 2 -33 8 3 .. .. .. -155 0 0 -30 49 25 9 28 9 0 270 -73 -31 33 44 -30 5 36 -33 7 36 .. .. .. Uncertainty in time = +/- 5 secs [Prediction of 2008 Apr 23.0] Data for the target star ------------------------ * name: UCAC2 31676012 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 18 24.9808 DE: -00 13 26.942 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .048, .059 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (276) Adelheid approx. diameter [km]: 122 approx. diameter ["]: .057 distance from Earth [AU]: 2.93600 * orbital information: orbit source: Preston date of fit: 2008 Apr 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 919 number of rejected observations: 93 time covered by the observations: 1907 Nov 02 - 2008 Apr 01 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.010, 100° remarks: * orbital elements for (276) Adelheid : Mean anomaly = 23.56154533 deg Arg. of pericenter = 268.00539222 deg Long. of node = 211.28462554 deg Inclination = 21.64230902 deg Eccentricity = 0.07208381 Semimajor axis = 3.11415209 AU Perihelion dist = 2.88967214 AU Mag: H = 8.47, G = 0.15 Epoch of elements : MJD 54595.39200000 TDT (2008 May 09.392) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 9 276 Adelheid 9h 25.0m UT 11.8 8 18 24.981- 0 13 26.94UCAC2 31676012 0.0 14.2 122 4.8 2.936 2.785 7.84 115.7963 -0.227 37.87 17.51 9.4161 0.12064 -0.64830 13.94241 2.62114 0.00530 -0.00172 2000 22.5945052008 5 4.00000268.005392211.284626 21.6423090.07208381 3.1141521 2.8896721 8.6 5.00.15 RATE 1.7934710 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.060 0.050 0 2.04 0.060 0 54579.5020080509_676012 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 23, 04:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org