IOTA/IOTA-ES occultation update for (358) Apollonia / TYC 6305-02167-1 event on 2012 Oct 13, 12:52 UT Visible from SE Asia Summary ------- On 2012 Oct 13 UT, the 89 km diameter asteroid (358) Apollonia will occult a 10.8 mag star in the constellation Sagittarius for observers along a path across SE Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.0 mag to 14.8 mag (the magnitude of the asteroid) for at most 5.6 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: 78 * date and approx. time of event: 2012 Oct 13, 12:51 - 2012 Oct 13, 12:57 UT * geocentric midpoint of event [JD]: 2456214.03624167 * magnitude of target star: 10.8 * magnitude drop [mag]: 4.0 * estimated maximum duration [s]: 5.6 * Moon: 5 % sunlit, 116° distance * Sun: 89° distance * rough path description: SE Asia The occultation path -------------------- * approximate projected width [km]: 106 * 1 sigma uncertainty interval [path widths]: +/- 0.71 * 1 sigma uncertainty interval [seconds]: +/- 5.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .030", 89° ) * approx speed of asteroid's shadow [km/s]: 15.9317 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6305-02167-1 by 358 Apollonia on 2012 Oct 13 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 72 0 0 13 11 11 12 51 52 57 174 0 12 42 35 13 39 57 12 2 13 14 21 3 73 0 0 13 11 48 12 51 59 57 176 -1 12 43 12 13 40 34 12 2 50 14 21 40 74 0 0 13 12 51 12 52 6 57 178 -2 12 44 15 13 41 37 12 3 53 14 22 44 75 0 0 13 14 20 12 52 13 57 180 -3 12 45 43 13 43 6 12 5 21 14 24 13 76 0 0 13 16 15 12 52 20 57 181 -4 12 47 38 13 45 1 12 7 14 14 26 9 77 0 0 13 18 35 12 52 27 57 183 -5 12 49 57 13 47 22 12 9 34 14 28 30 78 0 0 13 21 21 12 52 34 57 185 -6 12 52 43 13 50 9 12 12 18 14 31 18 79 0 0 13 24 33 12 52 41 57 187 -7 12 55 54 13 53 21 12 15 29 14 34 31 80 0 0 13 28 11 12 52 48 57 188 -8 12 59 31 13 56 59 12 19 5 14 38 11 81 0 0 13 32 14 12 52 55 57 190 -9 13 3 33 14 1 3 12 23 6 14 42 16 82 0 0 13 36 42 12 53 2 56 192 -10 13 8 1 14 5 33 12 27 32 14 46 47 83 0 0 13 41 37 12 53 9 56 194 -11 13 12 54 14 10 28 12 32 24 14 51 43 84 0 0 13 46 56 12 53 16 56 195 -12 13 18 13 14 15 48 12 37 41 14 57 5 85 0 0 13 52 41 12 53 23 55 197 -13 13 23 56 14 21 34 12 43 23 15 2 52 86 0 0 13 58 51 12 53 29 55 198 -14 13 30 5 14 27 45 12 49 30 15 9 5 87 0 0 14 5 25 12 53 36 54 200 -15 13 36 39 14 34 21 12 56 2 15 15 43 88 0 0 14 12 25 12 53 43 54 201 -16 13 43 37 14 41 23 13 2 59 15 22 46 89 0 0 14 19 50 12 53 50 54 203 -17 13 51 0 14 48 49 13 10 20 15 30 14 90 0 0 14 27 39 12 53 56 53 204 -18 13 58 48 14 56 39 13 18 5 15 38 7 91 0 0 14 35 52 12 54 3 52 206 -19 14 7 0 15 4 54 13 26 15 15 46 25 92 0 0 14 44 30 12 54 10 52 207 -20 14 15 36 15 13 34 13 34 49 15 55 6 93 0 0 14 53 32 12 54 16 51 208 -21 14 24 37 15 22 38 13 43 48 16 4 13 94 0 0 15 2 58 12 54 23 51 209 -22 14 34 1 15 32 6 13 53 9 16 13 43 95 0 0 15 12 48 12 54 29 50 211 -23 14 43 49 15 41 57 14 2 55 16 23 37 96 0 0 15 23 2 12 54 35 49 212 -24 14 54 0 15 52 12 14 13 4 16 33 55 97 0 0 15 33 38 12 54 42 49 213 -25 15 4 35 16 2 51 14 23 36 16 44 37 98 0 0 15 44 38 12 54 48 48 214 -26 15 15 33 16 13 53 14 34 31 16 55 42 99 0 0 15 56 1 12 54 54 47 215 -27 15 26 54 16 25 18 14 45 49 17 7 9 100 0 0 16 7 47 12 55 0 47 216 -28 15 38 37 16 37 5 14 57 30 17 19 0 101 0 0 16 19 54 12 55 6 46 217 -29 15 50 43 16 49 15 15 9 32 17 31 13 102 0 0 16 32 24 12 55 12 45 218 -30 16 3 11 17 1 48 15 21 57 17 43 49 103 0 0 16 45 16 12 55 18 44 219 -31 16 16 1 17 14 42 15 34 44 17 56 46 104 0 0 16 58 30 12 55 24 43 220 -32 16 29 12 17 27 57 15 47 52 18 10 5 105 0 0 17 12 5 12 55 29 43 221 -33 16 42 44 17 41 35 16 1 21 18 23 46 106 0 0 17 26 0 12 55 35 42 222 -34 16 56 38 17 55 33 16 15 11 18 37 47 107 0 0 17 40 17 12 55 40 41 222 -35 17 10 52 18 9 52 16 29 22 18 52 9 108 0 0 17 54 54 12 55 46 40 223 -36 17 25 26 18 24 31 16 43 53 19 6 52 109 0 0 18 9 50 12 55 51 39 224 -37 17 40 21 18 39 30 16 58 44 19 21 55 110 0 0 18 25 7 12 55 56 38 225 -38 17 55 35 18 54 49 17 13 55 19 37 18 111 0 0 18 40 43 12 56 2 38 225 -39 18 11 8 19 10 27 17 29 25 19 53 0 112 0 0 18 56 37 12 56 7 37 226 -40 18 27 0 19 26 25 17 45 13 20 9 0 113 0 0 19 12 50 12 56 12 36 227 -41 18 43 11 19 42 40 18 1 21 20 25 20 114 0 0 19 29 22 12 56 16 35 227 -42 18 59 40 19 59 14 18 17 46 20 41 57 115 0 0 19 46 11 12 56 21 34 228 -43 19 16 26 20 16 6 18 34 29 20 58 53 116 0 0 20 3 17 12 56 26 33 229 -44 19 33 30 20 33 15 18 51 29 21 16 6 117 0 0 20 20 41 12 56 30 32 229 -44 19 50 51 20 50 41 19 8 47 21 33 35 118 0 0 20 38 21 12 56 34 31 230 -45 20 8 28 21 8 23 19 26 21 21 51 21 119 0 0 20 56 17 12 56 39 30 230 -46 20 26 22 21 26 22 19 44 11 22 9 24 120 0 0 21 14 28 12 56 43 29 231 -47 20 44 31 21 44 36 20 2 16 22 27 41 121 0 0 21 32 55 12 56 47 29 232 -48 21 2 55 22 3 5 20 20 37 22 46 14 122 0 0 21 51 36 12 56 51 28 232 -49 21 21 34 22 21 49 20 39 12 23 5 2 123 0 0 22 10 31 12 56 54 27 233 -50 21 40 26 22 40 47 20 58 1 23 24 3 124 0 0 22 29 40 12 56 58 26 233 -50 21 59 33 22 59 58 21 17 4 23 43 18 125 0 0 22 49 2 12 57 2 25 234 -51 22 18 53 23 19 23 21 36 21 24 2 46 126 0 0 23 8 37 12 57 5 24 234 -52 22 38 25 23 39 0 21 55 50 24 22 27 127 0 0 23 28 24 12 57 8 23 235 -53 22 58 10 23 58 49 22 15 31 24 42 20 128 0 0 23 48 23 12 57 11 22 235 -54 23 18 6 24 18 50 22 35 24 25 2 24 129 0 0 24 8 32 12 57 14 21 236 -54 23 38 13 24 39 2 22 55 29 25 22 40 130 0 0 24 28 53 12 57 17 20 236 -55 23 58 31 24 59 25 23 15 43 25 43 6 131 0 0 24 49 23 12 57 20 19 237 -56 24 18 59 25 19 57 23 36 8 26 3 41 132 0 0 25 10 3 12 57 22 18 237 -57 24 39 37 25 40 39 23 56 43 26 24 26 133 0 0 25 30 51 12 57 25 17 238 -57 25 0 23 26 1 30 24 17 26 26 45 20 134 0 0 25 51 48 12 57 27 16 238 -58 25 21 18 26 22 29 24 38 18 27 6 22 135 0 0 26 12 53 12 57 29 15 239 -58 25 42 21 26 43 35 24 59 18 27 27 32 136 0 0 26 34 5 12 57 31 14 239 -59 26 3 31 27 4 49 25 20 26 27 48 48 137 0 0 26 55 23 12 57 33 13 240 -60 26 24 48 27 26 10 25 41 40 28 10 12 138 0 0 27 16 48 12 57 35 12 240 -60 26 46 10 27 47 36 26 3 0 28 31 41 139 0 0 27 38 18 12 57 37 11 241 -61 27 7 39 28 9 8 26 24 26 28 53 15 140 0 0 27 59 53 12 57 38 10 241 -61 27 29 12 28 30 45 26 45 57 29 14 54 141 0 0 28 21 32 12 57 40 10 242 -62 27 50 50 28 52 26 27 7 33 29 36 38 142 0 0 28 43 15 12 57 41 9 242 -62 28 12 32 29 14 10 27 29 12 29 58 25 143 0 0 29 5 2 12 57 42 8 243 -62 28 34 17 29 35 58 27 50 55 30 20 14 144 0 0 29 26 51 12 57 43 7 243 -63 28 56 4 29 57 49 28 12 41 30 42 7 145 0 0 29 48 42 12 57 44 6 244 -63 29 17 54 30 19 41 28 34 29 31 4 1 146 0 0 30 10 34 12 57 45 5 244 -63 29 39 45 30 41 35 28 56 19 31 25 57 147 0 0 30 32 28 12 57 45 4 245 -63 30 1 38 31 3 29 29 18 10 31 47 53 148 0 0 30 54 22 12 57 46 3 245 -64 30 23 31 31 25 24 29 40 1 32 9 49 149 0 0 31 16 15 12 57 46 2 246 -64 30 45 23 31 47 19 .. .. .. 32 31 45 150 0 0 31 38 8 12 57 46 1 246 -64 31 7 15 32 9 12 .. .. .. 32 53 40 151 0 0 32 0 0 12 57 46 0 247 -64 31 29 6 .. .. .. .. .. .. .. .. .. Uncertainty in time = +/- 5 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 6305-02167-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 22 27.8468 DE: -19 29 13.237 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .039, .029 ) * V mag [mag]: 10.8 * B mag [mag]: 11.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (358) Apollonia approx. diameter [km]: 89 approx. diameter ["]: .043 distance from Earth [AU]: 2.86800 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1285 number of rejected observations: 137 time covered by the observations: 1901 Dec 04 - 2012 Oct 03 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.010, 84° remarks: * orbital elements for (358) Apollonia : Mean anomaly = 258.93239653 deg Arg. of pericenter = 253.67995103 deg Long. of node = 172.22085306 deg Inclination = 3.54843068 deg Eccentricity = 0.15106347 Semimajor axis = 2.87708792 AU Perihelion dist = 2.44246504 AU Mag: H = 9.10, G = 0.15 Epoch of elements : MJD 56213.53600000 TDT (2012 Oct 13.536) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 13 358 Apollonia 12h 52.2m UT 10.8 19 22 27.847-19 29 13.24TYC 6305-02167-1 11.8 14.8 89 5.6 2.868 1.950 0.70 75.0821 -19.487 -16.51 -8.04 12.8698 -0.00887 0.53876 8.98948 0.22581 0.00581 0.00083 2000 258.21825220121010.00000253.679951172.220853 3.5484310.15106347 2.8770879 2.4424650 9.1 5.00.15 RATE 2.0196420 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.030 89 1.71 0.030 0 0-2 3 056208.0020121013_2167-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 18:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org