IOTA/IOTA-ES occultation update for (521) Brixia / 2UCAC 37677800 event on 2012 Oct 31, 17:32 UT Visible from Japan, SE Asia Summary ------- On 2012 Oct 31 UT, the 122 km diameter asteroid (521) Brixia will occult a 12.9 mag star in the constellation Orion for observers along a path across Japan, SE Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.3 mag to 11.7 mag (the magnitude of the asteroid) for at most 42.0 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: 94 * date and approx. time of event: 2012 Oct 31, 16:58 - 2012 Oct 31, 18:07 UT * geocentric midpoint of event [JD]: 2456232.2316125 * magnitude of target star: 12.9 * magnitude drop [mag]: 0.3 * estimated maximum duration [s]: 42.0 * Moon: 97 % sunlit, 31° distance * Sun: 128° distance * rough path description: Japan, SE Asia The occultation path -------------------- * approximate projected width [km]: 125 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 20.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .059 +/- .070) * 1 sigma uncertainty ellipse (major, minor, PA): ( .070", .059", 360° ) * approx speed of asteroid's shadow [km/s]: 2.9069 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 37677800 by 521 Brixia on 2012 Oct 31 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 ' " Longitude Longitude Longitude Longitude 82 4 6 -41 0 0 16 58 0 1 66 -32 83 52 6 80 9 0 85 26 16 ... .. .. 84 51 16 -40 0 0 16 58 4 4 65 -34 86 28 57 83 8 27 87 54 55 81 28 30 Latitude Latitude Latitude Latitude 85 0 0 -39 56 39 16 58 5 4 65 -34 -40 34 53 -39 18 16 -41 9 56 -38 42 48 86 0 0 -39 33 2 16 58 7 5 64 -34 -40 11 36 -38 54 19 -40 46 57 -38 18 33 87 0 0 -39 8 21 16 58 10 6 63 -35 -39 47 16 -38 29 17 -40 22 56 -37 53 11 88 0 0 -38 42 34 16 58 14 7 63 -36 -39 21 50 -38 3 7 -39 57 50 -37 26 40 89 0 0 -38 15 37 16 58 18 7 62 -36 -38 55 17 -37 35 47 -39 31 37 -36 58 58 90 0 0 -37 47 29 16 58 23 8 61 -37 -38 27 33 -37 7 15 -39 4 15 -36 30 3 91 0 0 -37 18 7 16 58 29 9 61 -38 -37 58 36 -36 37 27 -38 35 41 -35 59 51 92 0 0 -36 47 29 16 58 35 10 60 -38 -37 28 24 -36 6 21 -38 5 54 -35 28 20 93 0 0 -36 15 31 16 58 43 11 60 -39 -36 56 54 -35 33 54 -37 34 48 -34 55 26 94 0 0 -35 42 9 16 58 51 12 59 -40 -36 24 2 -35 0 3 -37 2 23 -34 21 7 95 0 0 -35 7 22 16 58 59 13 58 -40 -35 49 46 -34 24 44 -36 28 35 -33 45 19 96 0 0 -34 31 5 16 59 9 14 58 -41 -35 14 1 -33 47 54 -35 53 19 -33 7 57 97 0 0 -33 53 14 16 59 20 15 57 -42 -34 36 45 -33 9 29 -35 16 34 -32 28 59 98 0 0 -33 13 46 16 59 32 17 57 -42 -33 57 53 -32 29 24 -34 38 14 -31 48 20 99 0 0 -32 32 36 16 59 44 18 56 -43 -33 17 20 -31 47 35 -33 58 16 -31 5 55 100 0 0 -31 49 40 16 59 58 19 56 -44 -32 35 4 -31 3 58 -33 16 35 -30 21 39 101 0 0 -31 4 52 17 0 14 20 55 -45 -31 50 58 -30 18 27 -32 33 7 -29 35 28 102 0 0 -30 18 8 17 0 30 21 55 -45 -31 4 58 -29 30 58 -31 47 47 -28 47 16 103 0 0 -29 29 22 17 0 48 22 54 -46 -30 16 59 -28 41 24 -31 0 29 -27 56 56 104 0 0 -28 38 27 17 1 7 24 54 -47 -29 26 54 -27 49 39 -30 11 9 -27 4 24 105 0 0 -27 45 19 17 1 28 25 53 -48 -28 34 37 -26 55 37 -29 19 39 -26 9 31 106 0 0 -26 49 49 17 1 51 26 53 -49 -27 40 3 -25 59 10 -28 25 54 -25 12 11 107 0 0 -25 51 51 17 2 16 28 52 -49 -26 43 3 -25 0 12 -27 29 47 -24 12 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178 0 0 67 1 28 18 2 43 34 227 -12 66 20 18 67 42 45 65 42 29 68 20 49 179 0 0 67 17 56 18 2 53 33 228 -12 66 37 12 67 58 45 65 59 49 68 36 24 180 0 0 67 33 40 18 3 4 33 229 -11 66 53 22 68 14 4 66 16 22 68 51 19 -179 0 0 67 48 43 18 3 13 32 230 -11 67 8 50 68 28 42 66 32 13 69 5 34 -178 0 0 68 3 6 18 3 23 32 231 -11 67 23 36 68 42 41 66 47 21 69 19 11 -177 0 0 68 16 51 18 3 32 31 232 -10 67 37 44 68 56 3 67 1 49 69 32 13 -176 0 0 68 29 59 18 3 41 31 233 -10 67 51 13 69 8 49 67 15 39 69 44 39 -175 0 0 68 42 31 18 3 50 30 234 -10 68 4 7 69 21 1 67 28 51 69 56 32 -174 0 0 68 54 30 18 3 58 30 235 -9 68 16 25 69 32 40 67 41 28 70 7 53 -173 0 0 69 5 56 18 4 7 30 236 -9 68 28 10 69 43 47 67 53 30 70 18 42 -172 0 0 69 16 50 18 4 15 29 237 -9 68 39 22 69 54 24 68 4 59 70 29 2 -171 0 0 69 27 14 18 4 22 29 238 -9 68 50 3 70 4 30 68 15 55 70 38 53 -170 0 0 69 37 8 18 4 30 28 239 -8 69 0 14 70 14 8 68 26 21 70 48 16 -169 0 0 69 46 34 18 4 37 28 240 -8 69 9 55 70 23 18 68 36 16 70 57 11 -168 0 0 69 55 32 18 4 44 28 241 -8 69 19 8 70 32 2 68 45 43 71 5 41 -167 0 0 70 4 3 18 4 51 27 242 -7 69 27 53 70 40 19 68 54 41 71 13 45 -166 0 0 70 12 8 18 4 58 27 243 -7 69 36 11 70 48 10 69 3 11 71 21 24 -165 0 0 70 19 48 18 5 4 27 244 -7 69 44 4 70 55 37 69 11 15 71 28 40 -164 0 0 70 27 3 18 5 11 26 245 -7 69 51 31 71 2 41 69 18 53 71 35 32 -163 0 0 70 33 54 18 5 17 26 246 -6 69 58 33 71 9 20 69 26 6 71 42 1 -162 0 0 70 40 22 18 5 23 25 247 -6 70 5 12 71 15 38 69 32 54 71 48 8 -161 0 0 70 46 27 18 5 29 25 248 -6 70 11 26 71 21 32 69 39 18 71 53 54 -160 0 0 70 52 10 18 5 35 25 249 -6 70 17 18 71 27 6 69 45 18 71 59 19 -159 0 0 70 57 30 18 5 41 24 250 -5 70 22 48 71 32 18 69 50 56 72 4 23 -158 0 0 71 2 30 18 5 46 24 251 -5 70 27 55 71 37 9 69 56 11 72 9 6 -157 0 0 71 7 8 18 5 52 24 252 -5 70 32 41 71 41 40 70 1 4 72 13 30 -156 0 0 71 11 26 18 5 57 23 252 -5 70 37 6 71 45 51 70 5 35 72 17 35 -155 0 0 71 15 24 18 6 2 23 253 -4 70 41 10 71 49 42 70 9 45 72 21 20 -154 0 0 71 19 2 18 6 7 23 254 -4 70 44 54 71 53 14 70 13 34 72 24 47 -153 0 0 71 22 20 18 6 12 22 255 -4 70 48 18 71 56 27 70 17 2 72 27 55 -152 0 0 71 25 19 18 6 17 22 256 -4 70 51 21 71 59 21 70 20 10 72 30 45 -151 0 0 71 27 59 18 6 22 22 257 -3 70 54 5 72 1 57 70 22 58 72 33 16 -150 0 0 71 30 20 18 6 27 21 258 -3 70 56 30 72 4 14 70 25 26 72 35 30 -149 0 0 71 32 22 18 6 31 21 259 -3 70 58 36 72 6 14 70 27 35 72 37 27 -148 0 0 71 34 6 18 6 36 21 260 -3 71 0 22 72 7 55 70 29 24 72 39 6 -147 0 0 71 35 32 18 6 40 20 261 -2 71 1 50 72 9 19 70 30 53 72 40 27 -146 0 0 71 36 39 18 6 45 20 262 -2 71 2 59 72 10 24 70 32 4 72 41 32 -145 0 0 71 37 29 18 6 49 20 263 -2 71 3 49 72 11 13 70 32 55 72 42 19 -144 0 0 71 38 0 18 6 54 19 264 -2 71 4 21 72 11 43 70 33 27 72 42 49 -143 0 0 71 38 13 18 6 58 19 265 -2 71 4 34 72 11 57 70 33 41 72 43 2 -142 0 0 71 38 9 18 7 2 19 266 -1 71 4 29 72 11 52 70 33 35 72 42 59 -141 0 0 71 37 46 18 7 6 18 267 -1 71 4 6 72 11 31 70 33 11 72 42 38 -140 0 0 71 37 5 18 7 10 18 268 -1 71 3 24 72 10 52 70 32 27 72 42 0 -139 0 0 71 36 7 18 7 14 18 269 -1 71 2 23 72 9 55 70 31 25 72 41 5 -138 0 0 71 34 50 18 7 18 18 270 0 71 1 4 72 8 41 70 30 3 72 39 54 -137 0 0 71 33 16 18 7 21 17 271 0 70 59 26 72 7 9 70 28 23 72 38 25 Uncertainty in time = +/- 21 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: 2UCAC 37677800 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 59 12.6253 DE: +16 38 38.315 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .055, .069 ) * V mag [mag]: 12.9 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (521) Brixia approx. diameter [km]: 122 approx. diameter ["]: .138 distance from Earth [AU]: 1.21800 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 961 number of rejected observations: 74 time covered by the observations: 1904 Jan 10 - 2012 Oct 25 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.012, 76° remarks: * orbital elements for (521) Brixia : Mean anomaly = 11.15343330 deg Arg. of pericenter = 316.22032658 deg Long. of node = 89.66489533 deg Inclination = 10.59811671 deg Eccentricity = 0.28335611 Semimajor axis = 2.74009505 AU Perihelion dist = 1.96367237 AU Mag: H = 8.15, G = -0.06 Epoch of elements : MJD 56231.73100000 TDT (2012 Oct 31.731) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 31 521 Brixia 17h 33.5m UT 12.9 5 59 12.625 16 38 38.312UCAC 37677800 0.0 11.7 122 42.0 1.218 0.450 9.92 146.0007 16.641 -87.48 -14.40 17.5587 -0.18932 0.12389 0.89893 1.37259 -0.00417 0.00039 2000 10.77729020121030.00000316.220327 89.664895 10.5981170.28335611 2.7400951 1.9636724 8.3 5.0-.06 RATE 2.1729800 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.070 0.059 360 1.46 0.063 0 0 3 5 056226.0020121031_677800 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org