IOTA/IOTA-ES occultation update for (568) Cheruskia / UCAC2 39243449 event on 2008 Oct 01, 11:37 UT Visible from New Zealand Summary ------- On 2008 Oct 01 UT, the 87 km diameter asteroid (568) Cheruskia will occult a 11.5 mag star in the constellation Pegasus for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 13.1 mag (the magnitude of the asteroid) for at most 8.1 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: 97 * date and approx. time of event: 2008 Oct 01, 11:31 - 2008 Oct 01, 11:44 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 8.1 * Moon: 5 % sunlit, 133° distance * Sun: 147° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 133 * 1 sigma uncertainty interval [path widths]: +/- 0.38 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .025", 75° ) * approx speed of asteroid's shadow [km/s]: 10.7125 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 39243449 by 568 Cheruskia on 2008 Oct 1 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 ' " Longitude Longitude Longitude Longitude -179 53 11 -66 0 0 11 44 24 1 334 -21 178 29 48 -178 13 32 177 17 39 -176 55 51 179 3 1 -65 0 0 11 44 24 2 335 -22 177 31 5 -179 22 47 176 22 36 -178 9 31 178 7 49 -64 0 0 11 44 23 3 336 -23 176 40 20 179 37 17 175 35 4 -179 13 16 177 20 3 -63 0 0 11 44 22 4 337 -24 175 56 29 178 45 22 174 54 4 179 51 29 176 38 45 -62 0 0 11 44 21 5 337 -25 175 18 40 178 0 23 174 18 47 179 3 35 176 3 8 -61 0 0 11 44 19 6 338 -26 174 46 11 177 21 30 173 48 35 178 22 5 175 32 34 -60 0 0 11 44 18 7 338 -26 174 18 25 176 48 0 173 22 53 177 46 15 175 6 30 -59 0 0 11 44 15 8 339 -27 173 54 54 176 19 17 173 1 13 177 15 27 174 44 29 -58 0 0 11 44 13 9 339 -28 173 35 11 175 54 52 172 43 13 176 49 8 174 26 7 -57 0 0 11 44 10 10 339 -29 173 18 56 175 34 19 172 28 31 176 26 52 174 11 5 -56 0 0 11 44 7 11 339 -30 173 5 50 175 17 17 172 16 50 176 8 16 173 59 5 -55 0 0 11 44 4 12 339 -31 172 55 36 175 3 27 172 7 55 175 53 0 173 49 52 -54 0 0 11 44 1 13 340 -32 172 48 1 174 52 34 172 1 32 175 40 48 173 43 14 -53 0 0 11 43 57 14 340 -33 172 42 53 174 44 23 171 57 31 175 31 25 173 38 59 -52 0 0 11 43 53 15 340 -34 172 40 2 174 38 42 171 55 42 175 24 38 173 36 58 -51 0 0 11 43 49 16 340 -35 172 39 17 174 35 22 171 55 55 175 20 16 173 37 2 -50 0 0 11 43 44 17 339 -36 172 40 32 174 34 12 171 58 2 175 18 9 173 39 2 -49 0 0 11 43 40 18 339 -37 172 43 39 174 35 5 172 1 58 175 18 9 173 42 53 -48 0 0 11 43 35 19 339 -38 172 48 31 174 37 54 172 7 36 175 20 9 173 48 29 -47 0 0 11 43 30 20 339 -39 172 55 4 174 42 31 172 14 51 175 24 2 173 55 44 -46 0 0 11 43 24 21 339 -40 173 3 12 174 48 52 172 23 39 175 29 41 174 4 34 -45 0 0 11 43 18 21 338 -41 173 12 50 174 56 52 172 33 54 175 37 2 174 14 54 -44 0 0 11 43 12 22 338 -42 173 23 56 175 6 26 172 45 34 175 46 0 174 26 42 -43 0 0 11 43 6 23 338 -43 173 36 26 175 17 31 172 58 35 175 56 32 174 39 53 -42 0 0 11 43 0 24 338 -44 173 50 16 175 30 3 173 12 54 176 8 34 174 54 26 -41 0 0 11 42 53 25 337 -45 174 5 25 175 44 0 173 28 30 176 22 2 175 10 18 -40 0 0 11 42 46 26 337 -46 174 21 50 175 59 19 173 45 20 176 36 55 175 27 27 -39 0 0 11 42 39 27 336 -47 174 39 29 176 15 57 174 3 22 176 53 10 175 45 52 -38 0 0 11 42 32 27 336 -48 174 58 22 176 33 53 174 22 35 177 10 45 176 5 30 -37 0 0 11 42 24 28 335 -49 175 18 25 176 53 6 174 42 58 177 29 38 176 26 22 -36 0 0 11 42 16 29 335 -50 175 39 39 177 13 35 175 4 29 177 49 49 176 48 25 -35 0 0 11 42 8 30 334 -51 176 2 3 177 35 18 175 27 9 178 11 16 177 11 40 -34 0 0 11 42 0 31 334 -52 176 25 36 177 58 14 175 50 55 178 33 59 177 36 6 -33 0 0 11 41 52 31 333 -53 176 50 18 178 22 24 176 15 49 178 57 57 178 1 43 -32 0 0 11 41 43 32 332 -54 177 16 9 178 47 47 176 41 51 179 23 10 178 28 30 -31 0 0 11 41 34 33 332 -55 177 43 8 179 14 23 177 8 59 179 49 37 178 56 30 -30 0 0 11 41 25 34 331 -57 178 11 17 179 42 13 177 37 15 -179 42 40 179 25 41 -29 0 0 11 41 15 34 330 -58 178 40 35 -179 48 43 178 6 39 -179 13 41 179 56 4 -28 0 0 11 41 5 35 329 -59 179 11 4 -179 18 24 178 37 12 -178 43 25 -179 32 18 -27 0 0 11 40 55 36 328 -60 179 42 44 -178 46 49 179 8 55 -178 11 52 -178 59 26 -26 0 0 11 40 45 36 327 -61 -179 44 22 -178 13 56 179 41 49 -177 38 59 -178 25 17 -25 0 0 11 40 35 37 327 -62 -179 10 15 -177 39 45 -179 44 4 -177 4 46 -177 49 49 -24 0 0 11 40 24 37 326 -63 -178 34 51 -177 4 13 -179 8 43 -176 29 9 -177 13 1 -23 0 0 11 40 13 38 325 -64 -177 58 9 -176 27 18 -178 32 5 -175 52 8 -176 34 50 -22 0 0 11 40 2 38 324 -65 -177 20 7 -175 48 57 -177 54 9 -175 13 39 -175 55 13 -21 0 0 11 39 51 39 323 -66 -176 40 42 -175 9 8 -177 14 52 -174 33 40 -175 14 8 -20 0 0 11 39 39 39 321 -67 -175 59 50 -174 27 47 -176 34 10 -173 52 6 -174 31 29 -19 0 0 11 39 28 40 320 -67 -175 17 29 -173 44 50 -175 52 2 -173 8 54 -173 47 15 -18 0 0 11 39 16 40 319 -68 -174 33 35 -173 0 13 -175 8 22 -172 24 0 -173 1 19 -17 0 0 11 39 3 40 318 -69 -173 48 3 -172 13 52 -174 23 6 -171 37 18 -172 13 36 -16 0 0 11 38 51 40 317 -70 -173 0 48 -171 25 40 -173 36 11 -170 48 42 -171 24 2 -15 0 0 11 38 38 41 315 -71 -172 11 45 -170 35 31 -172 47 31 -169 58 6 -170 32 28 -14 0 0 11 38 25 41 314 -71 -171 20 47 -169 43 19 -171 56 59 -169 5 22 -169 38 48 -13 0 0 11 38 12 41 313 -72 -170 27 48 -168 48 55 -171 4 28 -168 10 23 -168 42 52 -12 0 0 11 37 58 41 312 -72 -169 32 38 -167 52 9 -170 9 52 -167 12 56 -167 44 30 -11 0 0 11 37 44 41 310 -73 -168 35 9 -166 52 51 -169 13 1 -166 12 52 -166 43 32 -10 0 0 11 37 30 41 309 -73 -167 35 11 -165 50 48 -168 13 45 -165 9 56 -165 39 42 - 9 0 0 11 37 15 41 308 -73 -166 32 29 -164 45 44 -167 11 52 -164 3 52 -164 32 45 - 8 0 0 11 37 0 40 306 -73 -165 26 50 -163 37 23 -166 7 8 -162 54 22 -163 22 22 - 7 0 0 11 36 45 40 305 -73 -164 17 56 -162 25 23 -164 59 17 -161 41 2 -162 8 10 - 6 0 0 11 36 30 40 303 -73 -163 5 27 -161 9 18 -163 48 1 -160 23 24 -160 49 41 - 5 0 0 11 36 14 39 302 -72 -161 48 57 -159 48 36 -162 32 54 -159 0 52 -159 26 19 - 4 0 0 11 35 57 39 301 -71 -160 27 56 -158 22 38 -161 13 31 -157 32 43 -157 57 20 - 3 0 0 11 35 40 38 299 -70 -159 1 44 -156 50 32 -159 49 14 -155 57 58 -156 21 46 - 2 0 0 11 35 23 37 298 -69 -157 29 32 -155 11 9 -158 19 21 -154 15 19 -154 38 20 - 1 0 0 11 35 5 36 297 -68 -155 50 15 -153 22 55 -156 42 53 -152 22 55 -152 45 13 0 0 0 11 34 46 35 296 -66 -154 2 24 -151 23 36 -154 58 32 -150 18 3 -150 39 45 1 0 0 11 34 26 33 294 -64 -152 3 52 -149 9 41 -153 4 31 -147 56 20 Latitude Latitude Latitude Latitude -150 0 0 1 17 37 11 34 20 33 294 -64 1 56 20 0 38 21 2 25 25 0 8 7 -149 0 0 1 42 58 11 34 11 32 294 -63 2 21 22 1 4 3 2 50 12 0 34 5 -148 0 0 2 6 52 11 34 2 31 293 -62 2 44 58 1 28 16 3 13 34 0 58 33 -147 0 0 2 29 20 11 33 54 31 293 -61 3 7 8 1 51 2 3 35 33 1 21 33 -146 0 0 2 50 24 11 33 45 30 293 -60 3 27 56 2 12 21 3 56 9 1 43 6 -145 0 0 3 10 4 11 33 37 29 292 -59 3 47 22 2 32 16 4 15 24 2 3 13 -144 0 0 3 28 22 11 33 30 28 292 -58 4 5 27 2 50 48 4 33 19 2 21 55 -143 0 0 3 45 19 11 33 22 28 292 -57 4 22 12 3 7 58 4 49 55 2 39 15 -142 0 0 4 0 56 11 33 15 27 291 -56 4 37 38 3 23 47 5 5 13 2 55 13 -141 0 0 4 15 15 11 33 8 26 291 -55 4 51 46 3 38 15 5 19 14 3 9 49 -140 0 0 4 28 15 11 33 1 25 291 -54 5 4 37 3 51 24 5 31 59 3 23 6 -139 0 0 4 39 57 11 32 55 24 291 -53 5 16 12 4 3 15 5 43 28 3 35 3 -138 0 0 4 50 23 11 32 48 23 291 -52 5 26 31 4 13 48 5 53 42 3 45 41 -137 0 0 4 59 32 11 32 42 23 291 -51 5 35 34 4 23 3 6 2 41 3 55 0 -136 0 0 5 7 25 11 32 36 22 290 -50 5 43 23 4 31 1 6 10 25 4 3 2 -135 0 0 5 14 2 11 32 31 21 290 -49 5 49 56 4 37 42 6 16 56 4 9 47 -134 0 0 5 19 25 11 32 25 20 290 -48 5 55 16 4 43 7 6 22 14 4 15 14 -133 0 0 5 23 31 11 32 20 19 290 -47 5 59 21 4 47 16 6 26 17 4 19 25 -132 0 0 5 26 23 11 32 15 18 290 -46 6 2 11 4 50 9 6 29 7 4 22 18 -131 0 0 5 28 0 11 32 10 17 290 -45 6 3 48 4 51 45 6 30 44 4 23 54 -130 0 0 5 28 21 11 32 6 16 290 -44 6 4 10 4 52 5 6 31 7 4 24 14 -129 0 0 5 27 27 11 32 1 15 290 -43 6 3 18 4 51 9 6 30 16 4 23 16 -128 0 0 5 25 17 11 31 57 15 290 -43 6 1 11 4 48 56 6 28 11 4 21 0 -127 0 0 5 21 50 11 31 54 14 290 -42 5 57 49 4 45 26 6 24 52 4 17 27 -126 0 0 5 17 8 11 31 50 13 290 -41 5 53 11 4 40 38 6 20 18 4 12 34 -125 0 0 5 11 8 11 31 47 12 290 -40 5 47 17 4 34 31 6 14 28 4 6 23 -124 0 0 5 3 50 11 31 44 11 290 -39 5 40 6 4 27 6 6 7 22 3 58 52 -123 0 0 4 55 13 11 31 41 10 290 -38 5 31 37 4 18 21 5 59 0 3 50 0 -122 0 0 4 45 17 11 31 38 9 290 -37 5 21 50 4 8 15 5 49 20 3 39 47 -121 0 0 4 34 0 11 31 36 8 290 -36 5 10 44 3 56 47 5 38 21 3 28 10 -120 0 0 4 21 21 11 31 34 7 291 -35 4 58 17 3 43 57 5 26 3 3 15 10 -119 0 0 4 7 20 11 31 32 6 291 -34 4 44 29 3 29 42 5 12 23 3 0 45 -118 0 0 3 51 54 11 31 31 5 291 -33 4 29 17 3 14 1 4 57 22 2 44 53 -117 0 0 3 35 3 11 31 29 4 291 -32 4 12 41 2 56 54 4 40 57 2 27 33 -116 0 0 3 16 44 11 31 29 3 291 -31 3 54 39 2 38 17 .. .. .. 2 8 42 -115 0 0 2 56 55 11 31 28 2 291 -30 3 35 9 2 18 10 .. .. .. 1 48 20 -114 0 0 2 35 36 11 31 28 1 291 -29 3 14 9 1 56 30 .. .. .. 1 26 24 Uncertainty in time = +/- 3 secs [Prediction of 2008 Sep 26.0] Data for the target star ------------------------ * name: UCAC2 39243449 * constellation : Pegasus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 35 58.3617 DE: +20 47 20.006 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .021 ) * V mag [mag]: 11.5 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (568) Cheruskia approx. diameter [km]: 87 approx. diameter ["]: .069 distance from Earth [AU]: 1.74500 * orbital information: orbit source: Preston date of fit: 2008 Sep 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 790 number of rejected observations: 51 time covered by the observations: 1915 Sep 13 - 2008 Sep 25 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.015, 64° remarks: * orbital elements for (568) Cheruskia : Mean anomaly = 308.64005818 deg Arg. of pericenter = 174.14102442 deg Long. of node = 249.93084232 deg Inclination = 18.38879144 deg Eccentricity = 0.16546530 Semimajor axis = 2.88289344 AU Perihelion dist = 2.40587461 AU Mag: H = 9.37, G = 0.15 Epoch of elements : MJD 54740.48500000 TDT (2008 Oct 01.485) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 1 568 Cheruskia 11h 38.0m UT 11.5 22 35 58.362 20 47 20.01UCAC2 39243449 0.0 13.1 87 8.1 1.745 -1.347 -23.90 153.9272 20.795 2.90 -3.44 11.6326 0.59273 -0.46930 -3.75176 -4.74167 0.00276 -0.00145 2000 308.542401200810 1.00000174.141024249.930842 18.3887910.16546530 2.8828934 2.4058746 9.1 5.00.15 RATE 2.0135440 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.025 75 1.38 0.026 0 54735.5020081001_243449 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 26, 02:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org