IOTA/IOTA-ES occultation update for (643) Scheherezade / TYC 6766-00825-1 event on 2009 May 05, 22:41 UT Visible from Summary ------- On 2009 May 05 UT, the 72 km diameter asteroid (643) Scheherezade will occult a 10.8 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.8 mag to 14.6 mag (the magnitude of the asteroid) for at most 5.1 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: 77 * date and approx. time of event: 2009 May 05, 22:36 - 2009 May 05, 22:45 UT * magnitude of target star: 10.8 * magnitude drop [mag]: 3.8 * estimated maximum duration [s]: 5.1 * Moon: 89 % sunlit, 46° distance * Sun: 170° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 118 * 1 sigma uncertainty interval [path widths]: +/- 0.72 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .028", 92° ) * approx speed of asteroid's shadow [km/s]: 13.9551 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6766-00825-1 by 643 Scheherezade on 2009 May 5 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 2 59 3 63 0 0 22 45 28 0 162 -10 4 13 55 ... .. .. 6 2 46 ... .. .. 3 42 8 62 0 0 22 45 28 1 163 -11 4 54 53 2 29 56 6 40 40 ... .. .. 4 25 43 61 0 0 22 45 27 2 163 -12 5 36 31 3 15 27 7 19 28 ... .. .. 5 9 47 60 0 0 22 45 27 3 164 -13 6 18 48 4 1 18 7 59 10 ... .. .. 5 54 23 59 0 0 22 45 26 4 164 -14 7 1 45 4 47 31 8 39 44 ... .. .. 6 39 30 58 0 0 22 45 24 5 165 -15 7 45 22 5 34 10 9 21 10 4 0 54 7 25 12 57 0 0 22 45 23 6 166 -16 8 29 40 6 21 14 10 3 28 4 49 58 8 11 28 56 0 0 22 45 21 8 166 -17 9 14 40 7 8 48 10 46 37 5 39 21 8 58 22 55 0 0 22 45 19 9 167 -18 10 0 22 7 56 51 11 30 37 6 29 6 9 45 53 54 0 0 22 45 17 10 168 -19 10 46 49 8 45 27 12 15 31 7 19 15 10 34 4 53 0 0 22 45 15 11 168 -20 11 34 1 9 34 37 13 1 17 8 9 51 11 22 56 52 0 0 22 45 12 12 169 -21 12 21 59 10 24 24 13 47 58 9 0 56 12 12 32 51 0 0 22 45 9 13 170 -22 13 10 46 11 14 50 14 35 34 9 52 34 13 2 54 50 0 0 22 45 5 14 171 -24 14 0 23 12 5 56 15 24 6 10 44 45 13 54 3 49 0 0 22 45 1 15 171 -25 14 50 52 12 57 46 16 13 38 11 37 34 14 46 3 48 0 0 22 44 57 16 172 -26 15 42 15 13 50 22 17 4 10 12 31 3 15 38 55 47 0 0 22 44 53 17 173 -27 16 34 35 14 43 47 17 55 45 13 25 15 16 32 43 46 0 0 22 44 49 18 174 -28 17 27 55 15 38 3 18 48 26 14 20 13 17 27 29 45 0 0 22 44 44 19 174 -29 18 22 17 16 33 13 19 42 14 15 16 0 18 23 16 44 0 0 22 44 38 20 175 -30 19 17 44 17 29 21 20 37 14 16 12 39 19 20 8 43 0 0 22 44 33 21 176 -31 20 14 21 18 26 31 21 33 28 17 10 15 20 18 9 42 0 0 22 44 27 22 177 -32 21 12 9 19 24 45 22 31 1 18 8 49 21 17 23 41 0 0 22 44 21 24 178 -33 22 11 15 20 24 8 23 29 56 19 8 28 22 17 54 40 0 0 22 44 14 25 179 -34 23 11 41 21 24 44 24 30 19 20 9 14 23 19 47 39 0 0 22 44 7 26 180 -34 24 13 34 22 26 39 25 32 14 21 11 12 24 23 7 38 0 0 22 44 0 27 181 -35 25 16 58 23 29 56 26 35 47 22 14 29 25 28 1 37 0 0 22 43 52 27 182 -36 26 22 1 24 34 43 27 41 6 23 19 8 26 34 35 36 0 0 22 43 44 28 183 -37 27 28 48 25 41 5 28 48 16 24 25 16 27 42 56 35 0 0 22 43 35 29 184 -38 28 37 28 26 49 10 29 57 27 25 33 0 28 53 12 34 0 0 22 43 26 30 186 -39 29 48 9 27 59 4 31 8 48 26 42 28 30 5 33 33 0 0 22 43 17 31 187 -39 31 1 1 29 10 58 32 22 30 27 53 46 31 20 10 32 0 0 22 43 7 32 188 -40 32 16 15 30 25 1 33 38 44 29 7 5 32 37 15 31 0 0 22 42 57 33 190 -41 33 34 4 31 41 24 34 57 46 30 22 36 33 57 1 30 0 0 22 42 47 34 191 -41 34 54 44 33 0 21 36 19 52 31 40 29 35 19 45 29 0 0 22 42 35 34 193 -42 36 18 32 34 22 6 37 45 23 33 0 59 36 45 46 28 0 0 22 42 24 35 194 -42 37 45 48 35 46 58 39 14 41 34 24 21 38 15 26 27 0 0 22 42 11 36 196 -43 39 16 58 37 15 18 40 48 16 35 50 54 39 49 15 26 0 0 22 41 59 36 198 -43 40 52 33 38 47 29 42 26 44 37 21 1 41 27 44 25 0 0 22 41 45 37 200 -43 42 33 10 40 24 3 44 10 49 38 55 7 43 11 37 24 0 0 22 41 31 37 202 -43 44 19 37 42 5 38 46 1 30 40 33 46 45 1 48 23 0 0 22 41 16 37 204 -43 46 12 56 43 53 0 48 0 4 42 17 36 46 59 27 22 0 0 22 41 0 38 206 -43 48 14 30 45 47 13 50 8 18 44 7 29 49 6 12 21 0 0 22 40 42 38 209 -42 50 26 15 47 49 37 52 28 46 46 4 32 Latitude Latitude Latitude Latitude 50 0 0 20 35 58 22 40 35 38 210 -42 21 11 32 20 0 55 22 3 44 19 11 18 51 0 0 20 10 10 22 40 27 37 211 -42 20 45 28 19 35 23 21 37 14 18 46 8 52 0 0 19 45 25 22 40 19 37 212 -41 20 20 26 19 10 53 21 11 48 18 21 59 53 0 0 19 21 42 22 40 11 37 213 -41 19 56 29 18 47 25 20 47 28 17 58 50 54 0 0 18 59 2 22 40 4 37 214 -41 19 33 34 18 24 58 20 24 11 17 36 42 55 0 0 18 37 23 22 39 56 37 215 -40 19 11 42 18 3 32 20 1 59 17 15 34 56 0 0 18 16 45 22 39 48 37 216 -40 18 50 51 17 43 6 19 40 49 16 55 25 57 0 0 17 57 8 22 39 41 36 217 -39 18 31 3 17 23 41 19 20 43 16 36 15 58 0 0 17 38 32 22 39 33 36 218 -39 18 12 16 17 5 16 19 1 38 16 18 5 59 0 0 17 20 57 22 39 26 36 219 -38 17 54 30 16 47 50 18 43 37 16 0 53 60 0 0 17 4 21 22 39 19 35 220 -38 17 37 44 16 31 24 18 26 36 15 44 39 61 0 0 16 48 45 22 39 11 35 221 -37 17 21 59 16 15 57 18 10 38 15 29 24 62 0 0 16 34 9 22 39 4 34 221 -37 17 7 15 16 1 28 17 55 40 15 15 7 63 0 0 16 20 32 22 38 57 34 222 -36 16 53 30 15 47 59 17 41 44 15 1 48 64 0 0 16 7 54 22 38 50 33 223 -35 16 40 45 15 35 28 17 28 48 14 49 26 65 0 0 15 56 15 22 38 43 33 224 -35 16 28 59 15 23 55 17 16 53 14 38 2 66 0 0 15 45 34 22 38 37 32 225 -34 16 18 13 15 13 20 17 5 58 14 27 35 67 0 0 15 35 53 22 38 30 32 225 -33 16 8 26 15 3 43 16 56 3 14 18 5 68 0 0 15 27 9 22 38 24 31 226 -33 15 59 38 14 55 5 16 47 8 14 9 32 69 0 0 15 19 24 22 38 17 31 227 -32 15 51 49 14 47 23 16 39 13 14 1 57 70 0 0 15 12 38 22 38 11 30 228 -31 15 44 59 14 40 40 16 32 17 13 55 18 71 0 0 15 6 49 22 38 5 29 228 -30 15 39 7 14 34 54 16 26 22 13 49 36 72 0 0 15 1 59 22 37 59 29 229 -30 15 34 15 14 30 6 16 21 26 13 44 51 73 0 0 14 58 7 22 37 53 28 229 -29 15 30 21 14 26 16 16 17 29 13 41 3 74 0 0 14 55 13 22 37 47 27 230 -28 15 27 26 14 23 23 16 14 32 13 38 11 75 0 0 14 53 17 22 37 42 27 231 -27 15 25 30 14 21 28 16 12 35 13 36 17 76 0 0 14 52 20 22 37 36 26 231 -26 15 24 32 14 20 30 16 11 38 13 35 20 77 0 0 14 52 20 22 37 31 25 232 -25 15 24 34 14 20 31 16 11 40 13 35 19 78 0 0 14 53 20 22 37 26 25 232 -25 15 25 34 14 21 29 16 12 42 13 36 16 79 0 0 14 55 18 22 37 20 24 233 -24 15 27 34 14 23 25 16 14 45 13 38 9 80 0 0 14 58 14 22 37 16 23 233 -23 15 30 33 14 26 19 16 17 47 13 41 1 81 0 0 15 2 10 22 37 11 22 234 -22 15 34 31 14 30 12 16 21 50 13 44 50 82 0 0 15 7 5 22 37 6 21 234 -21 15 39 29 14 35 3 16 26 54 13 49 36 83 0 0 15 12 59 22 37 2 21 235 -20 15 45 28 14 40 53 16 32 58 13 55 21 84 0 0 15 19 52 22 36 57 20 235 -19 15 52 26 14 47 42 16 40 4 14 2 3 85 0 0 15 27 46 22 36 53 19 235 -18 16 0 25 14 55 31 16 48 11 14 9 45 86 0 0 15 36 39 22 36 49 18 236 -17 16 9 25 15 4 19 16 57 19 14 18 24 87 0 0 15 46 34 22 36 46 17 236 -16 16 19 25 15 14 6 17 7 30 14 28 3 88 0 0 15 57 29 22 36 42 16 237 -16 16 30 28 15 24 54 17 18 44 14 38 42 89 0 0 16 9 25 22 36 39 15 237 -15 16 42 32 15 36 43 17 31 0 14 50 20 90 0 0 16 22 23 22 36 35 14 237 -14 16 55 39 15 49 32 17 44 20 15 2 58 91 0 0 16 36 23 22 36 32 13 238 -13 17 9 48 16 3 23 17 58 43 15 16 36 92 0 0 16 51 25 22 36 29 13 238 -12 17 25 1 16 18 16 18 14 11 15 31 16 93 0 0 17 7 31 22 36 27 12 238 -11 17 41 17 16 34 11 18 30 44 15 46 57 94 0 0 17 24 40 22 36 24 11 239 -10 17 58 37 16 51 9 18 48 22 16 3 39 95 0 0 17 42 53 22 36 22 10 239 -9 18 17 3 17 9 10 19 7 6 16 21 24 96 0 0 18 2 11 22 36 20 9 239 -8 18 36 34 17 28 15 19 26 57 16 40 12 97 0 0 18 22 33 22 36 18 8 240 -7 18 57 11 17 48 25 19 47 55 17 0 3 98 0 0 18 44 2 22 36 16 7 240 -6 19 18 54 18 9 39 20 10 1 17 20 58 99 0 0 19 6 37 22 36 15 6 240 -5 19 41 45 18 31 59 20 33 16 17 42 57 100 0 0 19 30 19 22 36 14 5 241 -4 20 5 44 18 55 25 20 57 40 .. .. .. 101 0 0 19 55 9 22 36 13 4 241 -3 20 30 51 19 19 58 21 23 15 .. .. .. 102 0 0 20 21 7 22 36 12 3 241 -2 20 57 8 19 45 38 21 50 0 .. .. .. 103 0 0 20 48 14 22 36 11 2 242 -1 21 24 35 20 12 27 22 17 57 .. .. .. Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 6766-00825-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 12 58.4158 DE: -25 35 04.490 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .022 ) * V mag [mag]: 10.8 * B mag [mag]: 12.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (643) Scheherezade approx. diameter [km]: 72 approx. diameter ["]: .042 distance from Earth [AU]: 2.38800 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 819 number of rejected observations: 40 time covered by the observations: 1907 Sep 12 - 2008 Feb 09 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.018, 93° remarks: * orbital elements for (643) Scheherezade : Mean anomaly = 94.64452993 deg Arg. of pericenter = 235.72245258 deg Long. of node = 252.36253460 deg Inclination = 13.76684633 deg Eccentricity = 0.06392615 Semimajor axis = 3.35452104 AU Perihelion dist = 3.14007941 AU Mag: H = 9.77, G = 0.15 Epoch of elements : MJD 54956.94500000 TDT (2009 May 05.945) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 May 5 643 Scheherezade 22h 40.8m UT 10.8 15 12 58.416-25 35 4.49TYC 6766-00825-1 12.3 14.6 72 5.1 2.388 -1.885 13.82 24.1029 -25.588 -161.04 16.50 22.6806 0.37724 0.69572 -6.92499 3.75314 -0.00049 0.00090 2000 93.5304142009 429.00000235.722453252.362535 13.7668460.06392615 3.3545210 3.1400794 9.7 5.00.15 RATE 1.6041990 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.028 92 1.72 0.030 0 54545.5020090505_0825-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 07:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org