IOTA/IOTA-ES occultation update for (358) Apollonia / UCAC2 24480506 event on 2012 Nov 06, 15:54 UT Visible from SW Asia, Arabia Summary ------- On 2012 Nov 06 UT, the 89 km diameter asteroid (358) Apollonia will occult a 11.9 mag star in the constellation Sagittarius for observers along a path across SW Asia, Arabia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.0 mag to 14.9 mag (the magnitude of the asteroid) for at most 3.5 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: 74 * date and approx. time of event: 2012 Nov 06, 15:55 - 2012 Nov 06, 15:57 UT * geocentric midpoint of event [JD]: 2456238.16289167 * magnitude of target star: 11.9 * magnitude drop [mag]: 3.0 * estimated maximum duration [s]: 3.5 * Moon: 53 % sunlit, 164° distance * Sun: 70° distance * rough path description: SW Asia, Arabia The occultation path -------------------- * approximate projected width [km]: 127 * 1 sigma uncertainty interval [path widths]: +/- 0.77 * 1 sigma uncertainty interval [seconds]: +/- 2.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .030", 89° ) * approx speed of asteroid's shadow [km/s]: 25.6104 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 24480506 by 358 Apollonia on 2012 Nov 6 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 19 0 0 28 23 43 15 55 22 42 190 -1 27 48 29 28 59 19 26 54 57 29 54 56 20 0 0 28 36 9 15 55 25 42 191 -2 28 0 52 29 11 49 27 7 15 30 7 32 21 0 0 28 49 1 15 55 29 41 192 -3 28 13 40 29 24 45 27 19 57 30 20 35 22 0 0 29 2 18 15 55 33 41 193 -4 28 26 53 29 38 6 27 33 4 30 34 2 23 0 0 29 16 0 15 55 37 41 194 -4 28 40 31 29 51 53 27 46 36 30 47 55 24 0 0 29 30 7 15 55 40 40 196 -5 28 54 33 30 6 3 28 0 32 31 2 13 25 0 0 29 44 37 15 55 44 40 197 -6 29 9 0 30 20 38 28 14 52 31 16 55 26 0 0 29 59 31 15 55 48 39 198 -7 29 23 50 30 35 37 28 29 35 31 32 1 27 0 0 30 14 49 15 55 51 39 199 -8 29 39 3 30 51 0 28 44 42 31 47 31 28 0 0 30 30 30 15 55 55 38 200 -9 29 54 39 31 6 45 29 0 12 32 3 24 29 0 0 30 46 34 15 55 58 37 201 -10 30 10 38 31 22 53 29 16 4 32 19 40 30 0 0 31 2 59 15 56 2 37 202 -11 30 26 59 31 39 24 29 32 18 32 36 18 31 0 0 31 19 47 15 56 5 36 203 -12 30 43 42 31 56 16 29 48 54 32 53 19 32 0 0 31 36 56 15 56 8 36 204 -13 31 0 46 32 13 31 30 5 51 33 10 41 33 0 0 31 54 26 15 56 12 35 205 -14 31 18 12 32 31 6 30 23 9 33 28 24 34 0 0 32 12 17 15 56 15 34 206 -14 31 35 57 32 49 1 30 40 47 33 46 28 35 0 0 32 30 27 15 56 18 34 207 -15 31 54 3 33 7 17 30 58 46 34 4 52 36 0 0 32 48 57 15 56 21 33 208 -16 32 12 28 33 25 52 31 17 3 34 23 36 37 0 0 33 7 46 15 56 24 32 209 -17 32 31 12 33 44 46 31 35 40 34 42 38 38 0 0 33 26 54 15 56 27 32 210 -18 32 50 14 34 3 59 31 54 35 35 2 0 39 0 0 33 46 20 15 56 30 31 211 -19 33 9 35 34 23 30 32 13 48 35 21 39 40 0 0 34 6 3 15 56 33 30 212 -20 33 29 13 34 43 19 32 33 18 35 41 36 41 0 0 34 26 2 15 56 36 30 213 -21 33 49 7 35 3 24 32 53 5 36 1 50 42 0 0 34 46 19 15 56 38 29 214 -21 34 9 18 35 23 45 33 13 9 36 22 20 43 0 0 35 6 50 15 56 41 28 214 -22 34 29 45 35 44 22 33 33 28 36 43 6 44 0 0 35 27 37 15 56 44 27 215 -23 34 50 27 36 5 15 33 54 2 37 4 7 45 0 0 35 48 39 15 56 46 27 216 -24 35 11 23 36 26 22 34 14 51 37 25 22 46 0 0 36 9 54 15 56 49 26 217 -25 35 32 34 36 47 42 34 35 54 37 46 51 47 0 0 36 31 23 15 56 51 25 218 -26 35 53 57 37 9 16 34 57 10 38 8 33 48 0 0 36 53 4 15 56 53 24 219 -26 36 15 33 37 31 2 35 18 39 38 30 28 49 0 0 37 14 57 15 56 56 23 219 -27 36 37 22 37 53 1 35 40 20 38 52 35 50 0 0 37 37 2 15 56 58 23 220 -28 36 59 21 38 15 10 36 2 12 39 14 53 51 0 0 37 59 17 15 57 0 22 221 -29 37 21 31 38 37 30 36 24 15 39 37 21 52 0 0 38 21 41 15 57 2 21 222 -30 37 43 51 39 0 0 36 46 28 39 59 59 53 0 0 38 44 16 15 57 4 20 222 -30 38 6 21 39 22 39 37 8 50 40 22 46 54 0 0 39 6 58 15 57 5 19 223 -31 38 28 59 39 45 27 37 31 22 40 45 41 55 0 0 39 29 49 15 57 7 19 224 -32 38 51 45 40 8 22 37 54 1 41 8 44 56 0 0 39 52 46 15 57 9 18 225 -33 39 14 38 40 31 24 38 16 47 41 31 54 57 0 0 40 15 51 15 57 11 17 225 -33 39 37 38 40 54 33 38 39 41 41 55 10 58 0 0 40 39 0 15 57 12 16 226 -34 40 0 43 41 17 47 39 2 40 42 18 31 59 0 0 41 2 15 15 57 13 15 227 -35 40 23 54 41 41 6 39 25 45 42 41 57 60 0 0 41 25 34 15 57 15 15 227 -36 40 47 9 42 4 29 39 48 54 43 5 27 61 0 0 41 48 57 15 57 16 14 228 -36 41 10 28 42 27 56 40 12 7 43 29 0 62 0 0 42 12 22 15 57 17 13 229 -37 41 33 49 42 51 25 40 35 23 43 52 36 63 0 0 42 35 50 15 57 18 12 230 -37 41 57 13 43 14 56 40 58 42 44 16 13 64 0 0 42 59 19 15 57 19 11 230 -38 42 20 39 43 38 29 41 22 3 44 39 52 65 0 0 43 22 48 15 57 20 10 231 -39 42 44 5 44 2 2 41 45 24 45 3 30 66 0 0 43 46 18 15 57 21 10 232 -39 43 7 32 44 25 35 42 8 46 45 27 9 67 0 0 44 9 47 15 57 22 9 233 -40 43 30 58 44 49 7 42 32 8 45 50 46 68 0 0 44 33 15 15 57 23 8 233 -40 43 54 23 45 12 38 42 55 29 46 14 21 69 0 0 44 56 40 15 57 24 7 234 -41 44 17 46 45 36 6 43 18 48 46 37 53 70 0 0 45 20 3 15 57 24 6 235 -41 44 41 6 45 59 31 43 42 5 47 1 23 71 0 0 45 43 22 15 57 25 6 235 -42 45 4 23 46 22 53 44 5 19 47 24 48 72 0 0 46 6 37 15 57 25 5 236 -42 45 27 36 46 46 10 44 28 29 47 48 9 73 0 0 46 29 48 15 57 25 4 237 -43 45 50 45 47 9 22 .. .. .. 48 11 24 74 0 0 46 52 53 15 57 26 3 238 -43 46 13 49 47 32 29 .. .. .. 48 34 34 75 0 0 47 15 52 15 57 26 2 238 -44 46 36 46 47 55 30 .. .. .. 48 57 37 76 0 0 47 38 45 15 57 26 2 239 -44 46 59 38 48 18 23 .. .. .. 49 20 32 77 0 0 48 1 30 15 57 26 1 240 -45 47 22 22 48 41 10 .. .. .. 49 43 20 78 0 0 48 24 8 15 57 26 0 241 -45 47 44 59 .. .. .. .. .. .. .. .. .. Uncertainty in time = +/- 3 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: UCAC2 24480506 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 45 42.4849 DE: -19 04 27.358 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .028 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (358) Apollonia approx. diameter [km]: 89 approx. diameter ["]: .039 distance from Earth [AU]: 3.16800 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1294 number of rejected observations: 136 time covered by the observations: 1901 Dec 04 - 2012 Oct 19 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.009, 83° remarks: * orbital elements for (358) Apollonia : Mean anomaly = 263.79305926 deg Arg. of pericenter = 253.69268090 deg Long. of node = 172.22018666 deg Inclination = 3.54847907 deg Eccentricity = 0.15107282 Semimajor axis = 2.87699546 AU Perihelion dist = 2.44235965 AU Mag: H = 9.10, G = 0.15 Epoch of elements : MJD 56237.66300000 TDT (2012 Nov 06.663) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 6 358 Apollonia 15h 54.6m UT 11.9 19 45 42.485-19 4 27.36UCAC2 24480506 0.0 14.9 89 3.5 3.168 2.812 4.54 11.5184 -19.075 -62.72 -16.23 15.9094 -0.07583 0.70992 14.36251 1.63439 0.00548 0.00106 2000 262.24533320121030.00000253.692681172.220187 3.5484790.15107282 2.8769955 2.4423596 9.1 5.00.15 RATE 2.0197390 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.030 89 1.77 0.030 0 0-1 2 056226.0020121106_480506 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org