IOTA/IOTA-ES occultation update for (405) Thia / 2UCAC 38548437 event on 2012 Sep 22, 05:15 UT Visible from Europe, SE USA, Mexico Summary ------- On 2012 Sep 22 UT, the 113 km diameter asteroid (405) Thia will occult a 13.0 mag star in the constellation Pisces for observers along a path across Europe, SE USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 13.2 mag (the magnitude of the asteroid) for at most 7.8 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: 64 * date and approx. time of event: 2012 Sep 22, 05:08 - 2012 Sep 22, 05:22 UT * geocentric midpoint of event [JD]: 2456192.71918333 * magnitude of target star: 13.0 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 7.8 * Moon: 43 % sunlit, 109° distance * Sun: 160° distance * rough path description: Europe, SE USA, Mexico The occultation path -------------------- * approximate projected width [km]: 116 * 1 sigma uncertainty interval [path widths]: +/- 0.95 * 1 sigma uncertainty interval [seconds]: +/- 7.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .068 +/- .066) * 1 sigma uncertainty ellipse (major, minor, PA): ( .068", .066", 89° ) * approx speed of asteroid's shadow [km/s]: 14.6188 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 38548437 by 405 Thia on 2012 Sep 22 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 -163 0 0 - 9 50 5 5 22 42 1 70 -9 - 9 16 36 -10 23 30 - 8 12 43 -11 26 47 -162 0 0 - 9 28 2 5 22 42 2 70 -10 - 8 54 27 -10 1 32 - 7 50 25 -11 4 59 -161 0 0 - 9 5 30 5 22 41 3 70 -11 - 8 31 49 - 9 39 5 - 7 27 37 -10 42 42 -160 0 0 - 8 42 27 5 22 41 4 70 -12 - 8 8 42 - 9 16 8 - 7 4 19 -10 19 54 -159 0 0 - 8 18 55 5 22 40 5 69 -13 - 7 45 4 - 8 52 41 - 6 40 32 - 9 56 38 -158 0 0 - 7 54 54 5 22 39 6 69 -14 - 7 20 58 - 8 28 45 - 6 16 15 - 9 32 52 -157 0 0 - 7 30 24 5 22 38 7 69 -15 - 6 56 23 - 8 4 21 - 5 51 29 - 9 8 38 -156 0 0 - 7 5 26 5 22 37 8 69 -16 - 6 31 19 - 7 39 28 - 5 26 15 - 8 43 55 -155 0 0 - 6 40 0 5 22 36 9 69 -17 - 6 5 48 - 7 14 7 - 5 0 33 - 8 18 45 -154 0 0 - 6 14 6 5 22 35 10 69 -18 - 5 39 48 - 6 48 19 - 4 34 23 - 7 53 6 -153 0 0 - 5 47 45 5 22 33 12 69 -19 - 5 13 21 - 6 22 3 - 4 7 46 - 7 27 1 -152 0 0 - 5 20 57 5 22 31 13 69 -20 - 4 46 28 - 5 55 20 - 3 40 43 - 7 0 28 -151 0 0 - 4 53 42 5 22 29 14 69 -21 - 4 19 8 - 5 28 11 - 3 13 12 - 6 33 29 -150 0 0 - 4 26 2 5 22 27 15 69 -22 - 3 51 22 - 5 0 36 - 2 45 16 - 6 6 4 -149 0 0 - 3 57 56 5 22 25 16 68 -23 - 3 23 11 - 4 32 36 - 2 16 55 - 5 38 14 -148 0 0 - 3 29 26 5 22 22 17 68 -24 - 2 54 35 - 4 4 10 - 1 48 9 - 5 9 58 -147 0 0 - 3 0 31 5 22 20 18 68 -25 - 2 25 35 - 3 35 21 - 1 18 59 - 4 41 18 -146 0 0 - 2 31 12 5 22 17 19 68 -26 - 1 56 11 - 3 6 7 - 0 49 25 - 4 12 15 -145 0 0 - 2 1 30 5 22 14 20 68 -27 - 1 26 24 - 2 36 31 - 0 19 28 - 3 42 47 -144 0 0 - 1 31 26 5 22 11 21 68 -28 - 0 56 15 - 2 6 31 0 10 51 - 3 12 58 -143 0 0 - 1 1 0 5 22 8 22 68 -29 - 0 25 44 - 1 36 10 0 41 32 - 2 42 46 -142 0 0 - 0 30 13 5 22 5 24 68 -30 0 5 8 - 1 5 28 1 12 33 - 2 12 13 -141 0 0 0 0 55 5 22 1 25 68 -31 0 36 21 - 0 34 25 1 43 55 - 1 41 19 -140 0 0 0 32 22 5 21 57 26 69 -32 1 7 53 - 0 3 2 2 15 36 - 1 10 5 -139 0 0 1 4 9 5 21 53 27 69 -33 1 39 43 0 28 39 2 47 36 - 0 38 32 -138 0 0 1 36 13 5 21 49 28 69 -34 2 11 52 1 0 39 3 19 54 - 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84 0 0 30 50 26 5 15 52 76 144 -59 31 25 40 30 15 19 32 32 52 29 8 49 - 83 0 0 31 16 12 5 15 45 76 149 -59 31 51 20 30 41 9 32 58 22 29 34 49 - 82 0 0 31 41 32 5 15 38 76 153 -58 32 16 35 31 6 34 33 23 28 30 0 23 - 81 0 0 32 6 26 5 15 31 76 158 -58 32 41 24 31 31 33 33 48 8 30 25 32 - 80 0 0 32 30 55 5 15 24 76 162 -57 33 5 48 31 56 8 34 12 22 30 50 16 - 79 0 0 32 54 58 5 15 17 76 166 -57 33 29 46 32 20 16 34 36 10 31 14 34 - 78 0 0 33 18 36 5 15 10 76 170 -57 33 53 19 32 43 59 34 59 32 31 38 26 - 77 0 0 33 41 47 5 15 3 76 174 -56 34 16 25 33 7 15 35 22 28 32 1 52 - 76 0 0 34 4 33 5 14 56 75 178 -56 34 39 5 33 30 6 35 44 58 32 24 53 - 75 0 0 34 26 52 5 14 50 75 182 -55 35 1 19 33 52 30 36 7 2 32 47 27 - 74 0 0 34 48 45 5 14 43 75 185 -55 35 23 6 34 14 28 36 28 39 33 9 35 - 73 0 0 35 10 11 5 14 36 74 188 -54 35 44 28 34 36 0 36 49 50 33 31 17 - 72 0 0 35 31 12 5 14 30 74 192 -54 36 5 23 34 57 6 37 10 35 33 52 32 - 71 0 0 35 51 45 5 14 23 73 194 -53 36 25 51 35 17 45 37 30 53 34 13 21 - 70 0 0 36 11 53 5 14 17 73 197 -52 36 45 53 35 37 58 37 50 46 34 33 44 - 69 0 0 36 31 34 5 14 11 72 200 -52 37 5 29 35 57 44 38 10 11 34 53 40 - 68 0 0 36 50 49 5 14 4 71 202 -51 37 24 39 36 17 4 38 29 11 35 13 10 - 67 0 0 37 9 37 5 13 58 71 205 -51 37 43 22 36 35 57 38 47 44 35 32 13 - 66 0 0 37 27 59 5 13 52 70 207 -50 38 1 39 36 54 25 39 5 51 35 50 50 - 65 0 0 37 45 55 5 13 46 70 209 -50 38 19 30 37 12 26 39 23 32 36 9 1 - 64 0 0 38 3 25 5 13 40 69 211 -49 38 36 54 37 30 0 39 40 47 36 26 45 - 63 0 0 38 20 28 5 13 34 68 213 -48 38 53 53 37 47 9 39 57 35 36 44 3 - 62 0 0 38 37 6 5 13 28 68 215 -48 39 10 25 38 3 51 40 13 58 37 0 54 - 61 0 0 38 53 18 5 13 22 67 216 -47 39 26 32 38 20 8 40 29 55 37 17 20 - 60 0 0 39 9 3 5 13 16 66 218 -47 39 42 13 38 35 58 40 45 27 37 33 20 - 59 0 0 39 24 23 5 13 11 66 220 -46 39 57 28 38 51 23 41 0 33 37 48 53 - 58 0 0 39 39 17 5 13 5 65 221 -45 40 12 17 39 6 22 41 15 13 38 4 1 - 57 0 0 39 53 46 5 12 59 64 223 -45 40 26 41 39 20 55 41 29 28 38 18 43 - 56 0 0 40 7 49 5 12 54 64 224 -44 40 40 40 39 35 3 41 43 18 38 32 59 - 55 0 0 40 21 26 5 12 48 63 225 -44 40 54 13 39 48 45 41 56 42 38 46 49 - 54 0 0 40 34 39 5 12 43 62 227 -43 41 7 21 40 2 1 42 9 42 39 0 14 - 53 0 0 40 47 26 5 12 38 62 228 -42 41 20 4 40 14 53 42 22 17 39 13 13 - 52 0 0 40 59 48 5 12 32 61 229 -42 41 32 22 40 27 19 42 34 26 39 25 47 - 51 0 0 41 11 45 5 12 27 60 231 -41 41 44 15 40 39 20 42 46 12 39 37 56 - 50 0 0 41 23 17 5 12 22 60 232 -41 41 55 43 40 50 56 42 57 32 39 49 40 - 49 0 0 41 34 25 5 12 17 59 233 -40 42 6 47 41 2 8 43 8 28 40 0 58 - 48 0 0 41 45 8 5 12 12 58 234 -39 42 17 26 41 12 54 43 19 0 40 11 52 - 47 0 0 41 55 26 5 12 7 57 235 -39 42 27 40 41 23 16 43 29 8 40 22 21 - 46 0 0 42 5 20 5 12 2 57 236 -38 42 37 31 41 33 14 43 38 52 40 32 25 - 45 0 0 42 14 50 5 11 57 56 237 -37 42 46 57 41 42 47 43 48 11 40 42 4 - 44 0 0 42 23 55 5 11 52 55 238 -37 42 55 59 41 51 56 43 57 7 40 51 19 - 43 0 0 42 32 37 5 11 47 55 239 -36 43 4 37 42 0 40 44 5 39 41 0 10 - 42 0 0 42 40 54 5 11 43 54 240 -35 43 12 52 42 9 1 44 13 48 41 8 36 - 41 0 0 42 48 47 5 11 38 53 241 -35 43 20 42 42 16 57 44 21 32 41 16 38 - 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26 0 0 44 0 13 5 10 35 43 255 -25 44 31 40 43 28 50 45 31 37 42 29 23 - 25 0 0 44 1 53 5 10 32 42 256 -25 44 33 20 43 30 31 45 33 15 42 31 5 - 24 0 0 44 3 11 5 10 28 42 256 -24 44 34 37 43 31 49 45 34 31 42 32 24 - 23 0 0 44 4 5 5 10 24 41 257 -23 44 35 31 43 32 44 45 35 24 42 33 20 - 22 0 0 44 4 37 5 10 21 40 258 -23 44 36 2 43 33 16 45 35 55 42 33 52 - 21 0 0 44 4 46 5 10 17 39 259 -22 44 36 11 43 33 25 45 36 4 42 34 1 - 20 0 0 44 4 31 5 10 14 39 260 -21 44 35 56 43 33 10 45 35 49 42 33 47 - 19 0 0 44 3 54 5 10 10 38 260 -21 44 35 19 43 32 33 45 35 12 42 33 9 - 18 0 0 44 2 54 5 10 7 37 261 -20 44 34 19 43 31 32 45 34 13 42 32 8 - 17 0 0 44 1 30 5 10 3 37 262 -19 44 32 56 43 30 8 45 32 51 42 30 43 - 16 0 0 43 59 44 5 10 0 36 263 -19 44 31 10 43 28 21 45 31 6 42 28 55 - 15 0 0 43 57 34 5 9 57 35 263 -18 44 29 1 43 26 11 45 28 59 42 26 43 - 14 0 0 43 55 1 5 9 54 35 264 -17 44 26 29 43 23 37 45 26 29 42 24 7 - 13 0 0 43 52 5 5 9 50 34 265 -17 44 23 34 43 20 40 45 23 36 42 21 8 - 12 0 0 43 48 46 5 9 47 33 266 -16 44 20 16 43 17 19 45 20 20 42 17 45 - 11 0 0 43 45 3 5 9 44 32 266 -15 44 16 35 43 13 35 45 16 41 42 13 59 - 10 0 0 43 40 57 5 9 41 32 267 -15 44 12 30 43 9 27 45 12 39 42 9 48 - 9 0 0 43 36 27 5 9 38 31 268 -14 44 8 2 43 4 56 45 8 14 42 5 13 - 8 0 0 43 31 34 5 9 35 30 269 -13 44 3 10 43 0 1 45 3 26 42 0 15 - 7 0 0 43 26 17 5 9 33 30 269 -13 43 57 55 42 54 42 44 58 15 41 54 52 - 6 0 0 43 20 36 5 9 30 29 270 -12 43 52 17 42 48 59 44 52 40 41 49 5 - 5 0 0 43 14 31 5 9 27 28 271 -11 43 46 14 42 42 52 44 46 42 41 42 54 - 4 0 0 43 8 2 5 9 24 27 272 -11 43 39 48 42 36 21 44 40 20 41 36 18 - 3 0 0 43 1 9 5 9 22 27 272 -10 43 32 57 42 29 25 44 33 34 41 29 18 - 2 0 0 42 53 52 5 9 19 26 273 -9 43 25 43 42 22 5 44 26 25 41 21 53 - 1 0 0 42 46 10 5 9 17 25 274 -9 43 18 4 42 14 21 44 18 52 41 14 4 0 0 0 42 38 4 5 9 14 25 274 -8 43 10 1 42 6 12 44 10 54 41 5 49 1 0 0 42 29 33 5 9 12 24 275 -7 43 1 33 41 57 38 44 2 32 40 57 9 2 0 0 42 20 38 5 9 10 23 276 -6 42 52 41 41 48 39 43 53 46 40 48 4 3 0 0 42 11 17 5 9 7 22 277 -6 42 43 24 41 39 15 43 44 36 40 38 34 4 0 0 42 1 32 5 9 5 22 277 -5 42 33 41 41 29 26 43 35 0 40 28 39 5 0 0 41 51 21 5 9 3 21 278 -4 42 23 34 41 19 12 43 25 0 40 18 18 6 0 0 41 40 45 5 9 1 20 279 -4 42 13 2 41 8 32 43 14 35 40 7 31 7 0 0 41 29 43 5 8 59 19 279 -3 42 2 4 40 57 26 43 3 45 39 56 18 8 0 0 41 18 16 5 8 57 19 280 -2 41 50 41 40 45 55 42 52 29 39 44 39 9 0 0 41 6 23 5 8 55 18 281 -1 41 38 52 40 33 58 42 40 48 39 32 34 10 0 0 40 54 3 5 8 53 17 281 -1 41 26 37 40 21 34 42 28 41 39 20 2 Uncertainty in time = +/- 7 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: 2UCAC 38548437 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 18 13.4672 DE: +19 23 37.208 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .066, .065 ) * V mag [mag]: 13.0 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (405) Thia approx. diameter [km]: 113 approx. diameter ["]: .070 distance from Earth [AU]: 2.21100 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 920 number of rejected observations: 82 time covered by the observations: 1903 Jun 27 - 2012 Aug 12 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.013, 68° remarks: * orbital elements for (405) Thia : Mean anomaly = 153.73217186 deg Arg. of pericenter = 308.89314073 deg Long. of node = 255.28613912 deg Inclination = 11.95009818 deg Eccentricity = 0.24410716 Semimajor axis = 2.58352794 AU Perihelion dist = 1.95287027 AU Mag: H = 8.47, G = 0.15 Epoch of elements : MJD 56192.21900000 TDT (2012 Sep 22.219) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 22 405 Thia 5h 15.6m UT 13.0 0 18 13.467 19 23 37.212UCAC 38548437 0.0 13.2 113 7.8 2.211 -2.119 -13.36 -75.8270 19.398 99.26 0.15 5.2604 -0.09383 0.21050 -7.53740 -3.35716 -0.00048 -0.00193 2000 153.2054982012 920.00000308.893141255.286139 11.9500980.24410716 2.5835279 1.9528703 8.5 5.00.15 RATE 2.3734730 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.068 0.066 89 1.95 0.067 0 0 2-2 056165.0020120922_548437 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 23:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org