IOTA/IOTA-ES occultation update for (643) Scheherezade / TYC 4916-01144-1 event on 2008 Jul 10, 08:27 UT Visible from New Zealand, SE Australia Summary ------- On 2008 Jul 10 UT, the 72 km diameter asteroid (643) Scheherezade will occult a 11.2 mag star in the constellation Sextans for observers along a path across New Zealand, SE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.7 mag to 15.9 mag (the magnitude of the asteroid) for at most 2.2 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: 70 * date and approx. time of event: 2008 Jul 10, 08:28 - 2008 Jul 10, 08:30 UT * midpoint of event [JD]: 2454657.85230833 * magnitude of target star: 11.2 * magnitude drop [mag]: 4.7 * estimated maximum duration [s]: 2.2 * Moon: 52 % sunlit, 36° distance * Sun: 57° distance * rough path description: New Zealand, SE Australia The occultation path -------------------- * approximate projected width [km]: 77 * 1 sigma uncertainty interval [path widths]: +/- 0.84 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .025 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .023", 99° ) * approx speed of asteroid's shadow [km/s]: 33.0978 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4916-01144-1 by 643 Scheherezade on 2008 Jul 10 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 130 0 0 -31 13 44 8 28 45 55 315 0 -31 35 1 -30 52 29 -32 10 54 -30 16 54 131 0 0 -31 24 1 8 28 48 55 313 -1 -31 45 17 -31 2 47 -32 21 9 -30 27 14 132 0 0 -31 34 6 8 28 50 54 312 -2 -31 55 21 -31 12 53 -32 31 12 -30 37 21 133 0 0 -31 43 59 8 28 53 53 311 -3 -32 5 14 -31 22 47 -32 41 2 -30 47 16 134 0 0 -31 53 39 8 28 55 52 310 -3 -32 14 53 -31 32 28 -32 50 41 -30 57 0 135 0 0 -32 3 8 8 28 58 52 309 -4 -32 24 21 -31 41 58 -33 0 7 -31 6 30 136 0 0 -32 12 24 8 29 0 51 308 -5 -32 33 36 -31 51 15 -33 9 21 -31 15 49 137 0 0 -32 21 28 8 29 3 50 307 -6 -32 42 39 -32 0 19 -33 18 22 -31 24 55 138 0 0 -32 30 19 8 29 5 49 306 -7 -32 51 29 -32 9 11 -33 27 11 -31 33 48 139 0 0 -32 38 57 8 29 7 48 305 -8 -33 0 7 -32 17 50 -33 35 47 -31 42 29 140 0 0 -32 47 23 8 29 10 48 304 -9 -33 8 32 -32 26 17 -33 44 10 -31 50 56 141 0 0 -32 55 35 8 29 12 47 303 -9 -33 16 43 -32 34 30 -33 52 21 -31 59 11 142 0 0 -33 3 35 8 29 14 46 302 -10 -33 24 42 -32 42 31 -34 0 18 -32 7 13 143 0 0 -33 11 22 8 29 16 45 301 -11 -33 32 29 -32 50 19 -34 8 3 -32 15 2 144 0 0 -33 18 56 8 29 19 45 300 -12 -33 40 2 -32 57 53 -34 15 35 -32 22 38 145 0 0 -33 26 17 8 29 21 44 299 -13 -33 47 21 -33 5 15 -34 22 53 -32 30 1 146 0 0 -33 33 24 8 29 23 43 299 -14 -33 54 28 -33 12 23 -34 29 59 -32 37 10 147 0 0 -33 40 18 8 29 25 42 298 -14 -34 1 22 -33 19 18 -34 36 51 -32 44 7 148 0 0 -33 46 59 8 29 27 41 297 -15 -34 8 2 -33 26 0 -34 43 30 -32 50 49 149 0 0 -33 53 27 8 29 29 41 296 -16 -34 14 29 -33 32 28 -34 49 56 -32 57 19 150 0 0 -33 59 41 8 29 31 40 295 -17 -34 20 43 -33 38 43 -34 56 8 -33 3 35 151 0 0 -34 5 42 8 29 33 39 295 -18 -34 26 43 -33 44 44 -35 2 7 -33 9 38 152 0 0 -34 11 29 8 29 35 38 294 -19 -34 32 30 -33 50 32 -35 7 53 -33 15 27 153 0 0 -34 17 3 8 29 36 37 293 -19 -34 38 3 -33 56 7 -35 13 25 -33 21 2 154 0 0 -34 22 24 8 29 38 37 292 -20 -34 43 22 -34 1 28 -35 18 44 -33 26 24 155 0 0 -34 27 30 8 29 40 36 292 -21 -34 48 29 -34 6 35 -35 23 49 -33 31 32 156 0 0 -34 32 23 8 29 42 35 291 -22 -34 53 21 -34 11 29 -35 28 41 -33 36 27 157 0 0 -34 37 3 8 29 43 34 290 -23 -34 58 0 -34 16 9 -35 33 19 -33 41 8 158 0 0 -34 41 29 8 29 45 33 289 -24 -35 2 25 -34 20 35 -35 37 43 -33 45 35 159 0 0 -34 45 41 8 29 47 33 289 -24 -35 6 37 -34 24 47 -35 41 54 -33 49 48 160 0 0 -34 49 39 8 29 48 32 288 -25 -35 10 35 -34 28 46 -35 45 51 -33 53 48 161 0 0 -34 53 24 8 29 50 31 287 -26 -35 14 19 -34 32 31 -35 49 34 -33 57 33 162 0 0 -34 56 54 8 29 51 30 287 -27 -35 17 49 -34 36 2 -35 53 4 -34 1 5 163 0 0 -35 0 12 8 29 53 29 286 -28 -35 21 6 -34 39 20 -35 56 20 -34 4 23 164 0 0 -35 3 15 8 29 54 29 285 -28 -35 24 9 -34 42 23 -35 59 23 -34 7 27 165 0 0 -35 6 4 8 29 56 28 285 -29 -35 26 58 -34 45 13 -36 2 11 -34 10 18 166 0 0 -35 8 40 8 29 57 27 284 -30 -35 29 34 -34 47 49 -36 4 46 -34 12 54 167 0 0 -35 11 2 8 29 58 26 283 -31 -35 31 55 -34 50 11 -36 7 7 -34 15 17 168 0 0 -35 13 10 8 30 0 25 283 -32 -35 34 3 -34 52 20 -36 9 15 -34 17 25 169 0 0 -35 15 4 8 30 1 24 282 -33 -35 35 57 -34 54 14 -36 11 8 -34 19 20 170 0 0 -35 16 44 8 30 2 24 281 -33 -35 37 37 -34 55 54 -36 12 48 -34 21 1 171 0 0 -35 18 11 8 30 3 23 281 -34 -35 39 3 -34 57 21 -36 14 14 -34 22 28 172 0 0 -35 19 23 8 30 4 22 280 -35 -35 40 16 -34 58 34 -36 15 26 -34 23 41 173 0 0 -35 20 22 8 30 6 21 279 -36 -35 41 14 -34 59 33 -36 16 25 -34 24 40 174 0 0 -35 21 7 8 30 7 20 279 -37 -35 41 59 -35 0 18 -36 17 9 -34 25 25 175 0 0 -35 21 38 8 30 8 20 278 -37 -35 42 30 -35 0 49 -36 17 40 -34 25 56 176 0 0 -35 21 55 8 30 9 19 278 -38 -35 42 47 -35 1 6 -36 17 58 -34 26 13 177 0 0 -35 21 59 8 30 10 18 277 -39 -35 42 51 -35 1 9 -36 18 1 -34 26 17 178 0 0 -35 21 48 8 30 10 17 276 -40 -35 42 40 -35 0 59 -36 17 51 -34 26 6 179 0 0 -35 21 24 8 30 11 16 276 -41 -35 42 16 -35 0 34 -36 17 27 -34 25 41 180 0 0 -35 20 46 8 30 12 16 275 -42 -35 41 38 -34 59 56 -36 16 49 -34 25 3 -179 0 0 -35 19 54 8 30 13 15 275 -42 -35 40 46 -34 59 4 -36 15 57 -34 24 11 -178 0 0 -35 18 48 8 30 14 14 274 -43 -35 39 41 -34 57 58 -36 14 52 -34 23 5 -177 0 0 -35 17 29 8 30 14 13 273 -44 -35 38 21 -34 56 39 -36 13 33 -34 21 45 -176 0 0 -35 15 55 8 30 15 12 273 -45 -35 36 48 -34 55 5 -36 12 0 -34 20 11 -175 0 0 -35 14 8 8 30 16 11 272 -46 -35 35 2 -34 53 18 -36 10 14 -34 18 23 -174 0 0 -35 12 8 8 30 16 11 272 -46 -35 33 1 -34 51 17 -36 8 14 -34 16 22 -173 0 0 -35 9 53 8 30 17 10 271 -47 -35 30 47 -34 49 2 -36 6 0 -34 14 7 -172 0 0 -35 7 25 8 30 17 9 270 -48 -35 28 19 -34 46 34 -36 3 33 -34 11 38 -171 0 0 -35 4 43 8 30 18 8 270 -49 -35 25 38 -34 43 52 -36 0 52 -34 8 55 -170 0 0 -35 1 48 8 30 18 7 269 -50 -35 22 43 -34 40 56 -35 57 58 -34 5 59 -169 0 0 -34 58 39 8 30 18 7 269 -51 -35 19 34 -34 37 46 -35 54 50 -34 2 48 -168 0 0 -34 55 16 8 30 19 6 268 -51 -35 16 12 -34 34 23 -35 51 28 -33 59 25 -167 0 0 -34 51 40 8 30 19 5 268 -52 -35 12 36 -34 30 47 -35 47 53 -33 55 47 -166 0 0 -34 47 50 8 30 19 4 267 -53 -35 8 47 -34 26 56 -35 44 5 -33 51 56 -165 0 0 -34 43 47 8 30 19 3 266 -54 -35 4 44 -34 22 53 -35 40 3 -33 47 52 -164 0 0 -34 39 30 8 30 19 2 266 -55 -35 0 28 -34 18 35 -35 35 47 -33 43 34 -163 0 0 -34 35 0 8 30 20 2 265 -56 -34 55 58 -34 14 5 -35 31 19 -33 39 2 -162 0 0 -34 30 17 8 30 20 1 265 -56 -34 51 15 -34 9 21 -35 26 37 -33 34 17 Uncertainty in time = +/- 2 secs [Prediction of 2008 Jun 6.0] Data for the target star ------------------------ * name: TYC 4916-01144-1 * constellation : Sextans * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 47 06.8097 DE: -04 43 59.703 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .019 ) * V mag [mag]: 11.2 * B mag [mag]: 11.6 * Apparent position with proper motion RA(deg): 161.8858650138 DE(deg): -4.7786327588 * Equation of equinoxes (radians) : 0.000051005374979 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (643) Scheherezade approx. diameter [km]: 72 approx. diameter ["]: .027 distance from Earth [AU]: 3.64500 * orbital information: orbit source: Preston date of fit: 2008 Jun 04 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 848 number of rejected observations: 41 time covered by the observations: 1907 Sep 12 - 2008 May 03 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.012, 112° remarks: * orbital elements for (643) Scheherezade : Mean anomaly = 46.33018712 deg Arg. of pericenter = 235.96801478 deg Long. of node = 252.36861610 deg Inclination = 13.76565665 deg Eccentricity = 0.06413416 Semimajor axis = 3.35564900 AU Perihelion dist = 3.14043729 AU Mag: H = 9.76, G = 0.15 Epoch of elements : MJD 54657.35200000 TDT (2008 Jul 10.352) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 10 643 Scheherezade 8h 27.3m UT 11.2 10 47 6.810- 4 43 59.70TYC 4916-01144-1 11.6 15.9 72 2.2 3.645 2.930 -10.62 106.3087 -4.731 54.53 22.17 8.4554 -0.08451 -0.34380 18.15536 -4.40156 0.00410 -0.00239 2000 45.1513742008 7 3.00000235.968015252.368616 13.7656570.06413416 3.3556490 3.1404373 9.7 5.00.15 RATE 1.6033910 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.025 0.023 99 1.84 0.023 0 54623.5020080710_1144-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 06, 22:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org