IOTA/IOTA-ES occultation update for (358) Apollonia / TYC 6291-00661-1 event on 2012 Sep 21, 08:01 UT Visible from New Zealand Summary ------- On 2012 Sep 21 UT, the 89 km diameter asteroid (358) Apollonia will occult a 12.0 mag star in the constellation Sagittarius 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 2.6 mag to 14.5 mag (the magnitude of the asteroid) for at most 13.8 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: 75 * date and approx. time of event: 2012 Sep 21, 07:58 - 2012 Sep 21, 08:16 UT * geocentric midpoint of event [JD]: 2456191.83434167 * magnitude of target star: 12.0 * magnitude drop [mag]: 2.6 * estimated maximum duration [s]: 13.8 * Moon: 34 % sunlit, 37° distance * Sun: 108° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 96 * 1 sigma uncertainty interval [path widths]: +/- 0.75 * 1 sigma uncertainty interval [seconds]: +/- 9.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .033", 359° ) * approx speed of asteroid's shadow [km/s]: 6.4731 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6291-00661-1 by 358 Apollonia on 2012 Sep 21 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 149 0 0 -37 57 0 7 58 24 65 46 -1 -38 24 21 -37 29 43 -39 5 34 -36 48 58 150 0 0 -38 12 26 7 58 38 66 44 -1 -38 39 44 -37 45 13 -39 20 52 -37 4 33 151 0 0 -38 27 32 7 58 53 66 41 -2 -38 54 47 -38 0 22 -39 35 49 -37 19 46 152 0 0 -38 42 16 7 59 8 67 39 -3 -39 9 28 -38 15 9 -39 50 26 -37 34 39 153 0 0 -38 56 39 7 59 23 67 36 -4 -39 23 48 -38 29 36 -40 4 41 -37 49 10 154 0 0 -39 10 41 7 59 37 67 34 -5 -39 37 47 -38 43 41 -40 18 35 -38 3 20 155 0 0 -39 24 22 7 59 52 67 31 -6 -39 51 24 -38 57 25 -40 32 8 -38 17 8 156 0 0 -39 37 42 8 0 6 68 28 -6 -40 4 41 -39 10 48 -40 45 19 -38 30 36 157 0 0 -39 50 40 8 0 21 68 26 -7 -40 17 36 -39 23 49 -40 58 10 -38 43 41 158 0 0 -40 3 17 8 0 35 68 23 -8 -40 30 10 -39 36 29 -41 10 39 -38 56 26 159 0 0 -40 15 32 8 0 50 68 20 -9 -40 42 22 -39 48 47 -41 22 47 -39 8 49 160 0 0 -40 27 27 8 1 4 68 18 -9 -40 54 14 -40 0 44 -41 34 34 -39 20 50 161 0 0 -40 38 59 8 1 18 68 15 -10 -41 5 44 -40 12 20 -41 46 0 -39 32 30 162 0 0 -40 50 11 8 1 32 68 12 -11 -41 16 52 -40 23 34 -41 57 4 -39 43 48 163 0 0 -41 1 1 8 1 46 68 9 -12 -41 27 40 -40 34 27 -42 7 48 -39 54 45 164 0 0 -41 11 30 8 2 1 68 6 -13 -41 38 6 -40 44 59 -42 18 10 -40 5 21 165 0 0 -41 21 38 8 2 15 68 4 -13 -41 48 11 -40 55 9 -42 28 11 -40 15 35 166 0 0 -41 31 24 8 2 28 68 1 -14 -41 57 55 -41 4 58 -42 37 51 -40 25 28 167 0 0 -41 40 49 8 2 42 68 358 -15 -42 7 18 -41 14 26 -42 47 10 -40 34 59 168 0 0 -41 49 53 8 2 56 67 356 -15 -42 16 20 -41 23 32 -42 56 8 -40 44 9 169 0 0 -41 58 36 8 3 10 67 353 -16 -42 25 0 -41 32 17 -43 4 45 -40 52 57 170 0 0 -42 6 58 8 3 23 67 351 -17 -42 33 20 -41 40 41 -43 13 1 -41 1 25 171 0 0 -42 14 59 8 3 37 67 348 -18 -42 41 18 -41 48 44 -43 20 57 -41 9 31 172 0 0 -42 22 39 8 3 50 66 346 -18 -42 48 56 -41 56 26 -43 28 31 -41 17 16 173 0 0 -42 29 57 8 4 4 66 343 -19 -42 56 13 -42 3 47 -43 35 45 -41 24 39 174 0 0 -42 36 55 8 4 17 66 341 -20 -43 3 9 -42 10 46 -43 42 38 -41 31 42 175 0 0 -42 43 32 8 4 30 65 339 -20 -43 9 44 -42 17 25 -43 49 11 -41 38 23 176 0 0 -42 49 48 8 4 44 65 337 -21 -43 15 58 -42 23 43 -43 55 23 -41 44 43 177 0 0 -42 55 44 8 4 57 65 334 -22 -43 21 52 -42 29 40 -44 1 14 -41 50 43 178 0 0 -43 1 18 8 5 10 64 332 -23 -43 27 25 -42 35 16 -44 6 45 -41 56 21 179 0 0 -43 6 32 8 5 23 64 330 -23 -43 32 38 -42 40 31 -44 11 55 -42 1 39 180 0 0 -43 11 26 8 5 35 63 328 -24 -43 37 30 -42 45 26 -44 16 45 -42 6 35 -179 0 0 -43 15 58 8 5 48 63 326 -25 -43 42 1 -42 50 0 -44 21 15 -42 11 11 -178 0 0 -43 20 11 8 6 1 62 325 -25 -43 46 12 -42 54 13 -44 25 24 -42 15 26 -177 0 0 -43 24 2 8 6 13 62 323 -26 -43 50 3 -42 58 6 -44 29 13 -42 19 20 -176 0 0 -43 27 33 8 6 26 61 321 -27 -43 53 33 -43 1 38 -44 32 42 -42 22 54 -175 0 0 -43 30 44 8 6 38 61 319 -27 -43 56 43 -43 4 50 -44 35 51 -42 26 7 -174 0 0 -43 33 35 8 6 51 60 318 -28 -43 59 33 -43 7 41 -44 38 39 -42 28 59 -173 0 0 -43 36 5 8 7 3 60 316 -28 -44 2 2 -43 10 12 -44 41 8 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47 8 9 45 51 297 -37 -44 1 46 -43 9 53 -44 40 54 -42 31 9 -158 0 0 -43 33 16 8 9 56 50 295 -38 -43 59 16 -43 7 20 -44 38 25 -42 28 35 -157 0 0 -43 30 24 8 10 7 50 294 -38 -43 56 25 -43 4 27 -44 35 35 -42 25 41 -156 0 0 -43 27 12 8 10 18 49 293 -39 -43 53 14 -43 1 15 -44 32 26 -42 22 27 -155 0 0 -43 23 40 8 10 28 48 292 -39 -43 49 44 -42 57 42 -44 28 57 -42 18 53 -154 0 0 -43 19 49 8 10 39 48 291 -40 -43 45 53 -42 53 49 -44 25 9 -42 14 58 -153 0 0 -43 15 37 8 10 49 47 290 -40 -43 41 43 -42 49 36 -44 21 0 -42 10 43 -152 0 0 -43 11 5 8 10 59 46 289 -41 -43 37 12 -42 45 3 -44 16 32 -42 6 8 -151 0 0 -43 6 14 8 11 10 46 288 -41 -43 32 22 -42 40 10 -44 11 44 -42 1 13 -150 0 0 -43 1 2 8 11 20 45 287 -42 -43 27 12 -42 34 57 -44 6 37 -41 55 57 -149 0 0 -42 55 31 8 11 30 44 286 -42 -43 21 42 -42 29 24 -44 1 9 -41 50 22 -148 0 0 -42 49 39 8 11 40 44 285 -43 -43 15 53 -42 23 31 -43 55 22 -41 44 26 -147 0 0 -42 43 28 8 11 49 43 284 -43 -43 9 43 -42 17 17 -43 49 15 -41 38 10 -146 0 0 -42 36 56 8 11 59 42 283 -44 -43 3 14 -42 10 44 -43 42 49 -41 31 34 -145 0 0 -42 30 5 8 12 9 41 282 -44 -42 56 24 -42 3 51 -43 36 2 -41 24 38 -144 0 0 -42 22 54 8 12 18 41 281 -45 -42 49 15 -41 56 37 -43 28 56 -41 17 21 -143 0 0 -42 15 22 8 12 27 40 280 -45 -42 41 46 -41 49 4 -43 21 30 -41 9 45 -142 0 0 -42 7 31 8 12 37 39 279 -46 -42 33 57 -41 41 10 -43 13 44 -41 1 48 -141 0 0 -41 59 20 8 12 46 38 278 -46 -42 25 48 -41 32 57 -43 5 39 -40 53 32 -140 0 0 -41 50 49 8 12 55 38 277 -47 -42 17 19 -41 24 24 -42 57 13 -40 44 55 -139 0 0 -41 41 58 8 13 4 37 276 -47 -42 8 30 -41 15 30 -42 48 28 -40 35 58 -138 0 0 -41 32 47 8 13 12 36 276 -47 -41 59 22 -41 6 17 -42 39 23 -40 26 41 -137 0 0 -41 23 16 8 13 21 35 275 -48 -41 49 53 -40 56 44 -42 29 59 -40 17 4 -136 0 0 -41 13 25 8 13 29 35 274 -48 -41 40 5 -40 46 50 -42 20 14 -40 7 7 -135 0 0 -41 3 15 8 13 38 34 273 -49 -41 29 57 -40 36 37 -42 10 10 -39 56 50 -134 0 0 -40 52 44 8 13 46 33 272 -49 -41 19 29 -40 26 4 -41 59 47 -39 46 13 -133 0 0 -40 41 54 8 13 54 32 272 -49 -41 8 42 -40 15 12 -41 49 3 -39 35 17 -132 0 0 -40 30 44 8 14 2 32 271 -50 -40 57 35 -40 3 59 -41 38 0 -39 24 0 -131 0 0 -40 19 15 8 14 10 31 270 -50 -40 46 8 -39 52 27 -41 26 37 -39 12 24 -130 0 0 -40 7 25 8 14 17 30 269 -50 -40 34 21 -39 40 35 -41 14 55 -39 0 28 -129 0 0 -39 55 17 8 14 25 29 268 -51 -40 22 15 -39 28 23 -41 2 53 -38 48 12 -128 0 0 -39 42 48 8 14 32 28 268 -51 -40 9 50 -39 15 52 -40 50 32 -38 35 37 -127 0 0 -39 30 0 8 14 39 28 267 -51 -39 57 5 -39 3 1 -40 37 52 -38 22 42 -126 0 0 -39 16 53 8 14 46 27 266 -51 -39 44 0 -38 49 51 -40 24 52 -38 9 27 -125 0 0 -39 3 27 8 14 53 26 265 -52 -39 30 37 -38 36 22 -40 11 32 -37 55 54 -124 0 0 -38 49 41 8 15 0 25 265 -52 -39 16 54 -38 22 33 -39 57 54 -37 42 1 -123 0 0 -38 35 36 8 15 6 24 264 -52 -39 2 52 -38 8 25 -39 43 56 -37 27 49 -122 0 0 -38 21 12 8 15 13 24 263 -52 -38 48 31 -37 53 58 -39 29 40 -37 13 18 -121 0 0 -38 6 29 8 15 19 23 263 -52 -38 33 51 -37 39 13 -39 15 5 -36 58 28 -120 0 0 -37 51 28 8 15 25 22 262 -52 -38 18 53 -37 24 8 -39 0 10 -36 43 19 -119 0 0 -37 36 8 8 15 30 21 261 -52 -38 3 35 -37 8 45 -38 44 58 -36 27 52 -118 0 0 -37 20 29 8 15 36 20 261 -53 -37 48 0 -36 53 4 -38 29 26 -36 12 6 -117 0 0 -37 4 32 8 15 41 19 260 -53 -37 32 6 -36 37 4 -38 13 36 -35 56 2 -116 0 0 -36 48 17 8 15 47 18 259 -53 -37 15 53 -36 20 46 -37 57 29 -35 39 40 -115 0 0 -36 31 44 8 15 52 18 259 -53 -36 59 23 -36 4 10 -37 41 3 -35 23 0 -114 0 0 -36 14 53 8 15 56 17 258 -53 -36 42 35 -35 47 17 -37 24 19 -35 6 2 -113 0 0 -35 57 44 8 16 1 16 257 -53 -36 25 29 -35 30 5 -37 7 17 -34 48 47 -112 0 0 -35 40 19 8 16 5 15 257 -53 -36 8 6 -35 12 37 -36 49 58 -34 31 14 -111 0 0 -35 22 36 8 16 9 14 256 -53 -35 50 26 -34 54 51 -36 32 22 -34 13 25 -110 0 0 -35 4 36 8 16 13 13 256 -52 -35 32 29 -34 36 49 -36 14 29 -33 55 19 -109 0 0 -34 46 19 8 16 17 12 255 -52 -35 14 15 -34 18 30 -35 56 19 -33 36 56 -108 0 0 -34 27 46 8 16 20 11 254 -52 -34 55 44 -33 59 54 -35 37 52 -33 18 17 -107 0 0 -34 8 57 8 16 23 11 254 -52 -34 36 58 -33 41 3 -35 19 10 -32 59 22 -106 0 0 -33 49 53 8 16 26 10 253 -52 -34 17 55 -33 21 56 -35 0 11 -32 40 11 -105 0 0 -33 30 32 8 16 29 9 253 -52 -33 58 37 -33 2 33 -34 40 57 -32 20 45 -104 0 0 -33 10 57 8 16 32 8 252 -51 -33 39 4 -32 42 55 -34 21 27 -32 1 4 -103 0 0 -32 51 6 8 16 34 7 251 -51 -33 19 16 -32 23 3 -34 1 42 -31 41 8 -102 0 0 -32 31 2 8 16 36 6 251 -51 -32 59 13 -32 2 56 -33 41 43 -31 20 58 -101 0 0 -32 10 43 8 16 37 5 250 -51 -32 38 56 -31 42 35 -33 21 29 -31 0 34 -100 0 0 -31 50 10 8 16 39 4 250 -50 -32 18 26 -31 22 0 -33 1 1 -30 39 57 - 99 0 0 -31 29 24 8 16 40 3 249 -50 -31 57 41 -31 1 12 -32 40 20 -30 19 6 - 98 0 0 -31 8 24 8 16 41 2 249 -50 -31 36 44 -30 40 11 -32 19 25 -29 58 2 - 97 0 0 -30 47 13 8 16 41 1 248 -49 -31 15 34 -30 18 58 -31 58 17 -29 36 46 - 96 0 0 -30 25 49 8 16 42 1 248 -49 -30 54 12 -29 57 32 -31 36 58 -29 15 19 Uncertainty in time = +/- 10 secs Prediction of 2012 Aug 7.0 Data for the target star ------------------------ * name: TYC 6291-00661-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 09 46.7992 DE: -19 21 49.101 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .033 ) * V mag [mag]: 12.0 * B mag [mag]: 11.9 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (358) Apollonia approx. diameter [km]: 89 approx. diameter ["]: .047 distance from Earth [AU]: 2.58800 * orbital information: orbit source: Preston date of fit: 2012 Aug 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1278 number of rejected observations: 137 time covered by the observations: 1901 Dec 04 - 2012 Jun 23 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.012, 85° remarks: * orbital elements for (358) Apollonia : Mean anomaly = 254.46009418 deg Arg. of pericenter = 253.66785331 deg Long. of node = 172.22148632 deg Inclination = 3.54839082 deg Eccentricity = 0.15105168 Semimajor axis = 2.87717729 AU Perihelion dist = 2.44257484 AU Mag: H = 9.10, G = 0.15 Epoch of elements : MJD 56191.33400000 TDT (2012 Sep 21.334) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 21 358 Apollonia 8h 1.5m UT 12.0 19 9 46.799-19 21 49.10TYC 6291-00661-1 11.9 14.5 89 13.8 2.588 0.864 -2.24 166.4773 -19.363 57.89 0.50 8.0242 -0.06664 -0.36269 3.59348 -0.66021 0.00548 0.00056 2000 254.1906862012 920.00000253.667853172.221486 3.5483910.15105168 2.8771773 2.4425748 9.1 5.00.15 RATE 2.0195480 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.033 359 1.75 0.035 0 0 2-1 056146.0020120921_0661-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 06, 20:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org