IOTA/IOTA-ES occultation update for (654) Zelinda / UCAC2 30694030 event on 2009 May 11, 11:26 UT Visible from Summary ------- On 2009 May 11 UT, the 129 km diameter asteroid (654) Zelinda will occult a 11.9 mag star in the constellation Hydra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.0 mag to 12.3 mag (the magnitude of the asteroid) for at most 5.7 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: 99 * date and approx. time of event: 2009 May 11, 11:27 - 2009 May 11, 11:29 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 1.0 * estimated maximum duration [s]: 5.7 * Moon: 95 % sunlit, 117° distance * Sun: 86° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 194 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .047 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .047", .034", 93° ) * approx speed of asteroid's shadow [km/s]: 22.5094 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 30694030 by 654 Zelinda on 2009 May 11 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 115 0 0 42 39 25 11 27 19 40 210 0 41 46 15 43 33 33 41 13 44 44 7 37 116 0 0 42 31 44 11 27 23 39 211 -1 41 38 36 43 25 50 41 6 6 43 59 54 117 0 0 42 24 12 11 27 26 39 212 -2 41 31 5 43 18 16 40 58 36 43 52 18 118 0 0 42 16 47 11 27 30 39 214 -2 41 23 41 43 10 49 40 51 13 43 44 50 119 0 0 42 9 30 11 27 33 38 215 -3 41 16 26 43 3 31 40 43 59 43 37 31 120 0 0 42 2 21 11 27 37 38 216 -4 41 9 19 42 56 20 40 36 53 43 30 19 121 0 0 41 55 21 11 27 40 38 217 -5 41 2 20 42 49 19 40 29 55 43 23 16 122 0 0 41 48 29 11 27 44 37 219 -5 40 55 30 42 42 25 40 23 6 43 16 22 123 0 0 41 41 47 11 27 47 37 220 -6 40 48 49 42 35 41 40 16 26 43 9 37 124 0 0 41 35 13 11 27 51 37 221 -7 40 42 17 42 29 6 40 9 55 43 3 0 125 0 0 41 28 48 11 27 54 36 222 -7 40 35 54 42 22 40 40 3 32 42 56 33 126 0 0 41 22 33 11 27 58 36 223 -8 40 29 40 42 16 23 39 57 19 42 50 15 127 0 0 41 16 27 11 28 1 35 224 -9 40 23 36 42 10 15 39 51 16 42 44 7 128 0 0 41 10 31 11 28 4 35 225 -10 40 17 41 42 4 18 39 45 22 42 38 8 129 0 0 41 4 44 11 28 8 34 226 -10 40 11 56 41 58 29 39 39 38 42 32 19 130 0 0 40 59 8 11 28 11 34 228 -11 40 6 20 41 52 51 39 34 3 42 26 40 131 0 0 40 53 41 11 28 14 33 229 -12 40 0 55 41 47 23 39 28 39 42 21 11 132 0 0 40 48 24 11 28 17 33 230 -12 39 55 40 41 42 5 39 23 24 42 15 52 133 0 0 40 43 18 11 28 20 32 231 -13 39 50 35 41 36 58 39 18 20 42 10 43 134 0 0 40 38 22 11 28 23 32 232 -14 39 45 40 41 32 0 39 13 27 42 5 45 135 0 0 40 33 37 11 28 26 31 233 -14 39 40 56 41 27 14 39 8 43 42 0 58 136 0 0 40 29 2 11 28 29 31 234 -15 39 36 23 41 22 38 39 4 10 41 56 21 137 0 0 40 24 38 11 28 32 30 235 -16 39 32 0 41 18 12 38 59 48 41 51 55 138 0 0 40 20 25 11 28 35 29 235 -16 39 27 48 41 13 58 38 55 37 41 47 39 139 0 0 40 16 23 11 28 38 29 236 -17 39 23 47 41 9 54 38 51 36 41 43 35 140 0 0 40 12 31 11 28 41 28 237 -17 39 19 56 41 6 2 38 47 47 41 39 42 141 0 0 40 8 51 11 28 43 28 238 -18 39 16 17 41 2 21 38 44 8 41 36 0 142 0 0 40 5 22 11 28 46 27 239 -19 39 12 49 40 58 50 38 40 41 41 32 29 143 0 0 40 2 4 11 28 49 26 240 -19 39 9 33 40 55 32 38 37 25 41 29 10 144 0 0 39 58 58 11 28 51 26 241 -20 39 6 27 40 52 24 38 34 20 41 26 2 145 0 0 39 56 3 11 28 54 25 242 -20 39 3 33 40 49 28 38 31 26 41 23 5 146 0 0 39 53 19 11 28 56 24 242 -21 39 0 50 40 46 44 38 28 44 41 20 20 147 0 0 39 50 47 11 28 58 24 243 -21 38 58 19 40 44 11 38 26 13 41 17 47 148 0 0 39 48 27 11 29 1 23 244 -22 38 55 59 40 41 50 38 23 54 41 15 25 149 0 0 39 46 18 11 29 3 22 245 -22 38 53 51 40 39 40 38 21 46 41 13 15 150 0 0 39 44 21 11 29 5 22 246 -23 38 51 55 40 37 42 38 19 50 41 11 17 151 0 0 39 42 35 11 29 7 21 246 -23 38 50 10 40 35 56 38 18 6 41 9 30 152 0 0 39 41 2 11 29 9 20 247 -24 38 48 36 40 34 22 38 16 33 41 7 55 153 0 0 39 39 40 11 29 11 19 248 -24 38 47 15 40 32 59 38 15 12 41 6 33 154 0 0 39 38 29 11 29 13 19 249 -25 38 46 5 40 31 49 38 14 2 41 5 22 155 0 0 39 37 31 11 29 15 18 249 -25 38 45 7 40 30 50 38 13 4 41 4 22 156 0 0 39 36 45 11 29 17 17 250 -26 38 44 21 40 30 3 38 12 18 41 3 35 157 0 0 39 36 10 11 29 18 17 251 -26 38 43 47 40 29 28 38 11 44 41 3 0 158 0 0 39 35 47 11 29 20 16 252 -27 38 43 24 40 29 5 38 11 22 41 2 37 159 0 0 39 35 36 11 29 22 15 252 -27 38 43 13 40 28 53 38 11 11 41 2 25 160 0 0 39 35 37 11 29 23 14 253 -27 38 43 14 40 28 54 38 11 12 41 2 26 161 0 0 39 35 49 11 29 24 14 254 -28 38 43 27 40 29 7 38 11 24 41 2 38 162 0 0 39 36 13 11 29 26 13 254 -28 38 43 51 40 29 31 38 11 49 41 3 3 163 0 0 39 36 50 11 29 27 12 255 -28 38 44 27 40 30 7 38 12 25 41 3 39 164 0 0 39 37 37 11 29 28 11 256 -29 38 45 15 40 30 55 38 13 13 41 4 27 165 0 0 39 38 37 11 29 29 11 256 -29 38 46 14 40 31 55 38 14 12 41 5 26 166 0 0 39 39 48 11 29 30 10 257 -29 38 47 26 40 33 6 38 15 23 41 6 38 167 0 0 39 41 11 11 29 31 9 258 -30 38 48 48 40 34 29 38 16 46 41 8 1 168 0 0 39 42 46 11 29 32 8 258 -30 38 50 23 40 36 4 38 18 20 41 9 36 169 0 0 39 44 32 11 29 33 8 259 -30 38 52 8 40 37 51 38 20 5 41 11 23 170 0 0 39 46 29 11 29 34 7 260 -30 38 54 5 40 39 49 38 22 2 41 13 21 171 0 0 39 48 38 11 29 34 6 260 -31 38 56 14 40 41 58 38 24 11 41 15 31 172 0 0 39 50 59 11 29 35 5 261 -31 38 58 34 40 44 19 38 26 30 41 17 52 173 0 0 39 53 31 11 29 35 5 262 -31 39 1 5 40 46 51 38 29 1 41 20 25 174 0 0 39 56 14 11 29 36 4 262 -31 39 3 48 40 49 35 38 31 43 41 23 9 175 0 0 39 59 8 11 29 36 3 263 -31 39 6 41 40 52 30 38 34 36 41 26 4 176 0 0 40 2 13 11 29 36 2 264 -31 39 9 46 40 55 35 38 37 41 41 29 10 177 0 0 40 5 29 11 29 37 1 264 -31 39 13 1 40 58 52 .. .. .. 41 32 28 178 0 0 40 8 56 11 29 37 1 265 -31 39 16 28 41 2 20 .. .. .. 41 35 56 Uncertainty in time = +/- 2 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 30694030 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 53 58.3527 DE: -03 28 09.532 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .045, .033 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (654) Zelinda approx. diameter [km]: 129 approx. diameter ["]: .111 distance from Earth [AU]: 1.60700 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 944 number of rejected observations: 68 time covered by the observations: 1908 Jan 04 - 2008 Jan 09 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.008, 126° remarks: * orbital elements for (654) Zelinda : Mean anomaly = 25.13759612 deg Arg. of pericenter = 213.93108690 deg Long. of node = 278.57043569 deg Inclination = 18.12787669 deg Eccentricity = 0.23235602 Semimajor axis = 2.29645242 AU Perihelion dist = 1.76285789 AU Mag: H = 8.51, G = 0.15 Epoch of elements : MJD 54962.47700000 TDT (2009 May 11.477) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 May 11 654 Zelinda 11h 26.5m UT 11.9 8 53 58.353- 3 28 9.53UCAC2 30694030 0.0 12.3 129 5.7 1.607 4.592 -10.18 92.4891 -3.465 7.47 17.98 11.4414 0.10839 0.74030 12.56796 -1.86066 0.00466 -0.00153 2000 24.4360702009 5 9.00000213.931087278.570436 18.1278770.23235602 2.2964524 1.7628579 8.5 5.00.15 RATE 2.8321610 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.047 0.034 93 1.31 0.034 0 54545.5020090511_694030 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 08:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org