IOTA/IOTA-ES occultation update for (2) Pallas / TYC 0149-01152-1 event on 2009 May 08, 08:01 UT Visible from Summary ------- On 2009 May 08 UT, the 554 km diameter asteroid (2) Pallas will occult a 11.7 mag star in the constellation Monoceros for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.1 mag to 8.9 mag (the magnitude of the asteroid) for at most 14.4 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: 100 * date and approx. time of event: 2009 May 08, 08:01 - 2009 May 08, 08:03 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 0.1 * estimated maximum duration [s]: 14.4 * Moon: 99 % sunlit, 108° distance * Sun: 61° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 911 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .023", 89° ) * approx speed of asteroid's shadow [km/s]: 38.5810 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0149-01152-1 by 2 Pallas on 2009 May 8 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 125 0 0 -53 10 5 8 1 7 35 352 0 -58 14 19 -48 41 53 -59 0 53 -48 6 28 126 0 0 -52 49 47 8 1 9 36 351 -1 -57 53 40 -48 21 49 -58 40 10 -47 46 26 127 0 0 -52 29 26 8 1 11 36 349 -1 -57 32 55 -48 1 43 -58 19 21 -47 26 22 128 0 0 -52 9 1 8 1 13 36 348 -1 -57 12 5 -47 41 35 -57 58 27 -47 6 15 129 0 0 -51 48 33 8 1 15 36 347 -2 -56 51 11 -47 21 25 -57 37 28 -46 46 8 130 0 0 -51 28 4 8 1 17 36 346 -2 -56 30 13 -47 1 15 -57 16 25 -46 25 59 131 0 0 -51 7 33 8 1 19 37 344 -3 -56 9 12 -46 41 4 -56 55 19 -46 5 51 132 0 0 -50 47 1 8 1 21 37 343 -3 -55 48 9 -46 20 54 -56 34 10 -45 45 43 133 0 0 -50 26 29 8 1 23 37 342 -3 -55 27 5 -46 0 44 -56 12 59 -45 25 37 134 0 0 -50 5 58 8 1 25 37 340 -4 -55 5 59 -45 40 36 -55 51 47 -45 5 31 135 0 0 -49 45 28 8 1 27 37 339 -4 -54 44 53 -45 20 31 -55 30 35 -44 45 28 136 0 0 -49 24 59 8 1 29 37 338 -5 -54 23 47 -45 0 28 -55 9 23 -44 25 28 137 0 0 -49 4 33 8 1 31 37 336 -5 -54 2 43 -44 40 28 -54 48 11 -44 5 32 138 0 0 -48 44 10 8 1 34 37 335 -6 -53 41 41 -44 20 32 -54 27 2 -43 45 39 139 0 0 -48 23 51 8 1 36 37 334 -6 -53 20 41 -44 0 41 -54 5 55 -43 25 51 140 0 0 -48 3 36 8 1 38 37 332 -7 -52 59 44 -43 40 54 -53 44 51 -43 6 8 141 0 0 -47 43 25 8 1 40 37 331 -8 -52 38 52 -43 21 14 -53 23 51 -42 46 31 142 0 0 -47 23 21 8 1 42 37 330 -8 -52 18 4 -43 1 39 -53 2 55 -42 27 0 143 0 0 -47 3 23 8 1 44 37 328 -9 -51 57 22 -42 42 12 -52 42 5 -42 7 36 144 0 0 -46 43 31 8 1 47 37 327 -9 -51 36 46 -42 22 52 -52 21 21 -41 48 20 145 0 0 -46 23 48 8 1 49 37 326 -10 -51 16 17 -42 3 39 -52 0 44 -41 29 11 146 0 0 -46 4 12 8 1 51 37 324 -10 -50 55 55 -41 44 36 -51 40 14 -41 10 11 147 0 0 -45 44 45 8 1 53 37 323 -11 -50 35 41 -41 25 41 -51 19 52 -40 51 21 148 0 0 -45 25 27 8 1 55 36 322 -12 -50 15 37 -41 6 57 -50 59 39 -40 32 40 149 0 0 -45 6 19 8 1 58 36 321 -12 -49 55 42 -40 48 22 -50 39 36 -40 14 10 150 0 0 -44 47 22 8 2 0 36 319 -13 -49 35 57 -40 29 59 -50 19 43 -39 55 50 151 0 0 -44 28 36 8 2 2 36 318 -14 -49 16 23 -40 11 46 -50 0 0 -39 37 41 152 0 0 -44 10 2 8 2 4 36 317 -14 -48 57 1 -39 53 46 -49 40 30 -39 19 45 153 0 0 -43 51 40 8 2 6 35 316 -15 -48 37 51 -39 35 58 -49 21 11 -39 2 1 154 0 0 -43 33 30 8 2 9 35 314 -16 -48 18 54 -39 18 22 -49 2 6 -38 44 30 155 0 0 -43 15 34 8 2 11 35 313 -16 -48 0 10 -39 1 0 -48 43 13 -38 27 12 156 0 0 -42 57 52 8 2 13 34 312 -17 -47 41 41 -38 43 52 -48 24 35 -38 10 8 157 0 0 -42 40 25 8 2 15 34 311 -18 -47 23 25 -38 26 59 -48 6 12 -37 53 18 158 0 0 -42 23 12 8 2 17 34 310 -18 -47 5 25 -38 10 20 -47 48 3 -37 36 44 159 0 0 -42 6 15 8 2 19 33 309 -19 -46 47 41 -37 53 56 -47 30 11 -37 20 24 160 0 0 -41 49 33 8 2 21 33 308 -20 -46 30 13 -37 37 49 -47 12 35 -37 4 20 161 0 0 -41 33 8 8 2 23 32 306 -20 -46 13 2 -37 21 57 -46 55 16 -36 48 33 162 0 0 -41 17 0 8 2 25 32 305 -21 -45 56 8 -37 6 22 -46 38 14 -36 33 2 163 0 0 -41 1 10 8 2 27 31 304 -22 -45 39 32 -36 51 4 -46 21 30 -36 17 48 164 0 0 -40 45 37 8 2 29 31 303 -23 -45 23 15 -36 36 4 -46 5 4 -36 2 51 165 0 0 -40 30 22 8 2 31 30 302 -23 -45 7 16 -36 21 21 -45 48 58 -35 48 12 166 0 0 -40 15 26 8 2 33 30 301 -24 -44 51 36 -36 6 56 -45 33 11 -35 33 51 167 0 0 -40 0 49 8 2 35 29 300 -25 -44 36 16 -35 52 50 -45 17 43 -35 19 49 168 0 0 -39 46 31 8 2 37 29 299 -26 -44 21 16 -35 39 3 -45 2 36 -35 6 6 169 0 0 -39 32 33 8 2 39 28 298 -26 -44 6 37 -35 25 35 -44 47 50 -34 52 41 170 0 0 -39 18 55 8 2 41 28 297 -27 -43 52 18 -35 12 27 -44 33 24 -34 39 37 171 0 0 -39 5 37 8 2 43 27 296 -28 -43 38 21 -34 59 39 -44 19 20 -34 26 52 172 0 0 -38 52 41 8 2 44 26 296 -29 -43 24 46 -34 47 10 -44 5 38 -34 14 27 173 0 0 -38 40 5 8 2 46 26 295 -30 -43 11 32 -34 35 3 -43 52 18 -34 2 23 174 0 0 -38 27 51 8 2 48 25 294 -30 -42 58 41 -34 23 16 -43 39 21 -33 50 39 175 0 0 -38 15 59 8 2 49 24 293 -31 -42 46 13 -34 11 50 -43 26 46 -33 39 17 176 0 0 -38 4 29 8 2 51 24 292 -32 -42 34 7 -34 0 46 -43 14 35 -33 28 15 177 0 0 -37 53 21 8 2 52 23 291 -33 -42 22 25 -33 50 3 -43 2 47 -33 17 36 178 0 0 -37 42 35 8 2 54 22 290 -34 -42 11 7 -33 39 42 -42 51 22 -33 7 18 179 0 0 -37 32 13 8 2 55 22 290 -34 -42 0 12 -33 29 43 -42 40 22 -32 57 21 180 0 0 -37 22 13 8 2 57 21 289 -35 -41 49 42 -33 20 6 -42 29 47 -32 47 48 -179 0 0 -37 12 37 8 2 58 20 288 -36 -41 39 36 -33 10 52 -42 19 35 -32 38 36 -178 0 0 -37 3 24 8 2 59 20 287 -37 -41 29 54 -33 2 1 -42 9 49 -32 29 47 -177 0 0 -36 54 35 8 3 1 19 287 -38 -41 20 37 -32 53 32 -42 0 28 -32 21 21 -176 0 0 -36 46 9 8 3 2 18 286 -38 -41 11 46 -32 45 26 -41 51 31 -32 13 18 -175 0 0 -36 38 8 8 3 3 17 285 -39 -41 3 19 -32 37 44 -41 43 1 -32 5 38 -174 0 0 -36 30 31 8 3 4 17 285 -40 -40 55 18 -32 30 25 -41 34 55 -31 58 21 -173 0 0 -36 23 19 8 3 5 16 284 -41 -40 47 43 -32 23 29 -41 27 16 -31 51 27 -172 0 0 -36 16 30 8 3 7 15 283 -42 -40 40 33 -32 16 57 -41 20 2 -31 44 57 -171 0 0 -36 10 7 8 3 8 14 283 -43 -40 33 49 -32 10 49 -41 13 15 -31 38 51 -170 0 0 -36 4 8 8 3 8 14 282 -43 -40 27 31 -32 5 5 -41 6 54 -31 33 8 -169 0 0 -35 58 35 8 3 9 13 281 -44 -40 21 39 -31 59 45 -41 0 59 -31 27 50 -168 0 0 -35 53 26 8 3 10 12 281 -45 -40 16 14 -31 54 48 -40 55 31 -31 22 55 -167 0 0 -35 48 42 8 3 11 11 280 -46 -40 11 15 -31 50 16 -40 50 29 -31 18 24 -166 0 0 -35 44 24 8 3 12 11 279 -47 -40 6 42 -31 46 8 -40 45 54 -31 14 18 -165 0 0 -35 40 30 8 3 12 10 279 -47 -40 2 36 -31 42 25 -40 41 45 -31 10 35 -164 0 0 -35 37 2 8 3 13 9 278 -48 -39 58 56 -31 39 6 -40 38 4 -31 7 17 -163 0 0 -35 34 0 8 3 14 8 277 -49 -39 55 43 -31 36 11 -40 34 49 -31 4 24 -162 0 0 -35 31 23 8 3 14 7 277 -50 -39 52 57 -31 33 41 -40 32 1 -31 1 54 -161 0 0 -35 29 11 8 3 15 7 276 -51 -39 50 38 -31 31 35 -40 29 41 -30 59 49 -160 0 0 -35 27 25 8 3 15 6 276 -51 -39 48 45 -31 29 54 -40 27 47 -30 58 9 -159 0 0 -35 26 4 8 3 15 5 275 -52 -39 47 19 -31 28 37 -40 26 20 -30 56 52 -158 0 0 -35 25 9 8 3 16 4 275 -53 -39 46 20 -31 27 45 -40 25 20 -30 56 1 -157 0 0 -35 24 40 8 3 16 3 274 -54 -39 45 48 -31 27 18 -40 24 48 -30 55 33 -156 0 0 -35 24 36 8 3 16 2 273 -54 -39 45 42 -31 27 15 -40 24 42 -30 55 30 -155 0 0 -35 24 57 8 3 16 2 273 -55 -39 46 4 -31 27 36 -40 25 4 -30 55 52 -154 0 0 -35 25 44 8 3 16 1 272 -56 -39 46 52 -31 28 22 -40 25 52 -30 56 38 Uncertainty in time = +/- 1 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 0149-01152-1 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 59 44.0240 DE: +01 21 27.858 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .022 ) * V mag [mag]: 11.7 * B mag [mag]: 11.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2) Pallas approx. diameter [km]: 554 approx. diameter ["]: .313 distance from Earth [AU]: 2.43700 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 6743 number of rejected observations: 565 time covered by the observations: 1900 Jun 17 - 2008 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.009, 0.005, 80° remarks: * orbital elements for (2) Pallas : Mean anomaly = 1.99819887 deg Arg. of pericenter = 310.24451232 deg Long. of node = 173.12937447 deg Inclination = 34.83823040 deg Eccentricity = 0.23093790 Semimajor axis = 2.77290061 AU Perihelion dist = 2.13253278 AU Mag: H = 4.09, G = 0.11 Epoch of elements : MJD 54959.33400000 TDT (2009 May 08.334) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 May 8 2 Pallas 8h 1.6m UT 11.7 6 59 44.024 1 21 27.86TYC 0149-01152-1 11.7 8.9 554 14.4 2.437 5.001 23.43 118.2462 1.350 58.73 17.16 8.0267 0.23666 -0.75784 20.78423 6.49762 0.00433 -0.00149 2000 0.0058272009 429.00000310.244512173.129374 34.8382300.23093790 2.7729006 2.1325328 4.1 5.00.11 RATE 2.1345320 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.027 0.023 89 1.07 0.023 0 54545.5020090508_1152-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 08:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org