IOTA/IOTA-ES occultation update for (133) Cyrene / TYC 6331-00173-1 event on 2012 Nov 04, 00:05 UT Visible from Uruguay, Argentina Summary ------- On 2012 Nov 04 UT, the 71 km diameter asteroid (133) Cyrene will occult a 10.1 mag star in the constellation Capricornus for observers along a path across Uruguay, Argentina. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.5 mag to 13.6 mag (the magnitude of the asteroid) for at most 3.7 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: 62 * date and approx. time of event: 2012 Nov 04, 00:05 - 2012 Nov 04, 00:09 UT * geocentric midpoint of event [JD]: 2456235.50352917 * magnitude of target star: 10.1 * magnitude drop [mag]: 3.5 * estimated maximum duration [s]: 3.7 * Moon: 78 % sunlit, 148° distance * Sun: 87° distance * rough path description: Uruguay, Argentina The occultation path -------------------- * approximate projected width [km]: 83 * 1 sigma uncertainty interval [path widths]: +/- 0.99 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .034", 358° ) * approx speed of asteroid's shadow [km/s]: 19.0575 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6331-00173-1 by 133 Cyrene on 2012 Nov 4 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 - 79 0 0 -45 26 24 0 5 4 59 332 0 -45 51 57 -45 0 59 -46 42 54 -44 11 2 - 78 0 0 -45 3 23 0 5 9 59 330 -1 -45 28 59 -44 37 54 -46 20 4 -43 47 50 - 77 0 0 -44 39 59 0 5 13 59 328 -2 -45 5 38 -44 14 27 -45 56 51 -43 24 15 - 76 0 0 -44 16 12 0 5 18 59 326 -3 -44 41 55 -43 50 36 -45 33 14 -43 0 18 - 75 0 0 -43 52 2 0 5 23 59 324 -3 -44 17 49 -43 26 23 -45 9 15 -42 35 59 - 74 0 0 -43 27 31 0 5 28 58 322 -4 -43 53 20 -43 1 49 -44 44 53 -42 11 18 - 73 0 0 -43 2 37 0 5 33 58 320 -5 -43 28 30 -42 36 52 -44 20 9 -41 46 15 - 72 0 0 -42 37 22 0 5 38 58 318 -6 -43 3 18 -42 11 34 -43 55 3 -41 20 52 - 71 0 0 -42 11 46 0 5 43 58 316 -7 -42 37 45 -41 45 55 -43 29 36 -40 55 7 - 70 0 0 -41 45 49 0 5 48 58 314 -8 -42 11 50 -41 19 55 -43 3 47 -40 29 2 - 69 0 0 -41 19 32 0 5 53 57 312 -9 -41 45 36 -40 53 35 -42 37 37 -40 2 37 - 68 0 0 -40 52 54 0 5 58 57 310 -9 -41 19 1 -40 26 56 -42 11 8 -39 35 53 - 67 0 0 -40 25 58 0 6 3 57 308 -10 -40 52 7 -39 59 57 -41 44 18 -39 8 50 - 66 0 0 -39 58 42 0 6 9 57 306 -11 -40 24 54 -39 32 40 -41 17 9 -38 41 28 - 65 0 0 -39 31 9 0 6 14 56 304 -12 -39 57 22 -39 5 4 -40 49 42 -38 13 49 - 64 0 0 -39 3 17 0 6 19 56 302 -13 -39 29 32 -38 37 11 -40 21 56 -37 45 52 - 63 0 0 -38 35 9 0 6 24 55 300 -14 -39 1 26 -38 9 1 -39 53 52 -37 17 39 - 62 0 0 -38 6 44 0 6 29 55 299 -15 -38 33 2 -37 40 35 -39 25 32 -36 49 10 - 61 0 0 -37 38 4 0 6 35 54 297 -16 -38 4 23 -37 11 53 -38 56 55 -36 20 26 - 60 0 0 -37 9 8 0 6 40 54 295 -17 -37 35 28 -36 42 56 -38 28 3 -35 51 27 - 59 0 0 -36 39 58 0 6 45 53 293 -18 -37 6 20 -36 13 45 -37 58 56 -35 22 15 - 58 0 0 -36 10 35 0 6 50 53 292 -19 -36 36 57 -35 44 21 -37 29 35 -34 52 50 - 57 0 0 -35 40 59 0 6 56 52 290 -20 -36 7 22 -35 14 45 -37 0 1 -34 23 12 - 56 0 0 -35 11 11 0 7 1 52 289 -21 -35 37 34 -34 44 57 -36 30 14 -33 53 23 - 55 0 0 -34 41 13 0 7 6 51 287 -22 -35 7 36 -34 14 58 -36 0 16 -33 23 24 - 54 0 0 -34 11 4 0 7 11 50 286 -23 -34 37 27 -33 44 49 -35 30 7 -32 53 15 - 53 0 0 -33 40 46 0 7 16 50 284 -24 -34 7 9 -33 14 31 -34 59 48 -32 22 58 - 52 0 0 -33 10 20 0 7 21 49 283 -25 -33 36 42 -32 44 6 -34 29 21 -31 52 33 - 51 0 0 -32 39 46 0 7 26 48 282 -26 -33 6 8 -32 13 33 -33 58 45 -31 22 1 - 50 0 0 -32 9 6 0 7 32 47 280 -27 -32 35 27 -31 42 53 -33 28 3 -30 51 23 - 49 0 0 -31 38 20 0 7 37 47 279 -28 -32 4 40 -31 12 9 -32 57 14 -30 20 41 - 48 0 0 -31 7 31 0 7 42 46 278 -29 -31 33 49 -30 41 20 -32 26 21 -29 49 54 - 47 0 0 -30 36 37 0 7 46 45 277 -29 -31 2 55 -30 10 28 -31 55 24 -29 19 5 - 46 0 0 -30 5 42 0 7 51 44 276 -30 -30 31 58 -29 39 34 -31 24 23 -28 48 14 - 45 0 0 -29 34 45 0 7 56 43 275 -31 -30 0 59 -29 8 39 -30 53 21 -28 17 22 - 44 0 0 -29 3 47 0 8 1 42 274 -32 -29 29 59 -28 37 43 -30 22 18 -27 46 30 - 43 0 0 -28 32 50 0 8 6 42 273 -33 -28 59 1 -28 6 48 -29 51 15 -27 15 39 - 42 0 0 -28 1 55 0 8 10 41 272 -34 -28 28 3 -27 35 55 -29 20 13 -26 44 50 - 41 0 0 -27 31 3 0 8 15 40 271 -35 -27 57 9 -27 5 5 -28 49 14 -26 14 4 - 40 0 0 -27 0 14 0 8 19 39 270 -36 -27 26 17 -26 34 19 -28 18 17 -25 43 23 - 39 0 0 -26 29 30 0 8 24 38 269 -37 -26 55 31 -26 3 38 -27 47 26 -25 12 47 - 38 0 0 -25 58 52 0 8 28 37 268 -38 -26 24 50 -25 33 2 -27 16 39 -24 42 17 - 37 0 0 -25 28 20 0 8 33 36 267 -39 -25 54 15 -25 2 34 -26 45 59 -24 11 54 - 36 0 0 -24 57 57 0 8 37 35 267 -40 -25 23 49 -24 32 13 -26 15 26 -23 41 39 - 35 0 0 -24 27 42 0 8 41 34 266 -41 -24 53 30 -24 2 1 -25 45 1 -23 11 33 - 34 0 0 -23 57 36 0 8 45 33 265 -42 -24 23 22 -23 31 59 -25 14 46 -22 41 37 - 33 0 0 -23 27 42 0 8 49 32 265 -43 -23 53 24 -23 2 7 -24 44 41 -22 11 52 - 32 0 0 -22 57 58 0 8 53 31 264 -44 -23 23 37 -22 32 28 -24 14 47 -21 42 19 - 31 0 0 -22 28 28 0 8 56 30 263 -45 -22 54 3 -22 3 0 -23 45 6 -21 12 59 - 30 0 0 -21 59 10 0 9 0 29 263 -46 -22 24 42 -21 33 47 -23 15 37 -20 43 52 - 29 0 0 -21 30 7 0 9 3 28 262 -47 -21 55 35 -21 4 47 -22 46 23 -20 15 0 - 28 0 0 -21 1 19 0 9 7 27 262 -48 -21 26 43 -20 36 3 -22 17 23 -19 46 23 - 27 0 0 -20 32 47 0 9 10 26 261 -49 -20 58 7 -20 7 35 -21 48 40 -19 18 2 - 26 0 0 -20 4 32 0 9 13 25 261 -50 -20 29 48 -19 39 24 -21 20 13 -18 49 58 - 25 0 0 -19 36 34 0 9 16 24 260 -51 -20 1 46 -19 11 30 -20 52 3 -18 22 12 - 24 0 0 -19 8 55 0 9 19 23 260 -51 -19 34 3 -18 43 54 -20 24 11 -17 54 44 - 23 0 0 -18 41 34 0 9 22 22 259 -52 -19 6 38 -18 16 38 -19 56 38 -17 27 35 - 22 0 0 -18 14 34 0 9 25 21 259 -53 -18 39 34 -17 49 41 -19 29 25 -17 0 47 - 21 0 0 -17 47 53 0 9 27 20 258 -54 -18 12 49 -17 23 5 -19 2 33 -16 34 18 - 20 0 0 -17 21 34 0 9 30 19 258 -55 -17 46 26 -16 56 50 -18 36 1 -16 8 11 - 19 0 0 -16 55 37 0 9 32 18 258 -55 -17 20 24 -16 30 57 -18 9 51 -15 42 26 - 18 0 0 -16 30 2 0 9 34 17 257 -56 -16 54 45 -16 5 25 -17 44 3 -15 17 3 - 17 0 0 -16 4 50 0 9 36 16 257 -57 -16 29 29 -15 40 17 -17 18 38 -14 52 2 - 16 0 0 -15 40 1 0 9 38 15 257 -58 -16 4 36 -15 15 33 -16 53 37 -14 27 26 - 15 0 0 -15 15 36 0 9 40 14 256 -58 -15 40 7 -14 51 12 -16 29 0 -14 3 13 - 14 0 0 -14 51 36 0 9 42 13 256 -59 -15 16 3 -14 27 16 -16 4 47 -13 39 25 - 13 0 0 -14 28 1 0 9 43 12 256 -59 -14 52 23 -14 3 45 -15 41 0 -13 16 2 - 12 0 0 -14 4 51 0 9 45 11 255 -60 -14 29 10 -13 40 39 -15 17 38 -12 53 4 - 11 0 0 -13 42 7 0 9 46 10 255 -61 -14 6 22 -13 18 0 -14 54 42 -12 30 32 - 10 0 0 -13 19 50 0 9 47 9 255 -61 -13 44 0 -12 55 46 -14 32 12 -12 8 26 - 9 0 0 -12 57 59 0 9 48 8 255 -62 -13 22 6 -12 33 59 -14 10 10 -11 46 47 - 8 0 0 -12 36 36 0 9 49 7 254 -62 -13 0 38 -12 12 40 -13 48 34 -11 25 35 - 7 0 0 -12 15 39 0 9 50 6 254 -62 -12 39 38 -11 51 47 -13 27 26 -11 4 50 - 6 0 0 -11 55 11 0 9 50 5 254 -63 -12 19 6 -11 31 23 -13 6 46 -10 44 32 - 5 0 0 -11 35 11 0 9 51 4 254 -63 -11 59 2 -11 11 26 -12 46 35 .. .. .. - 4 0 0 -11 15 39 0 9 51 3 254 -63 -11 39 26 -10 51 58 -12 26 52 .. .. .. - 3 0 0 -10 56 36 0 9 52 2 253 -63 -11 20 19 -10 32 58 -12 7 37 .. .. .. - 2 0 0 -10 38 1 0 9 52 1 253 -64 -11 1 41 -10 14 27 -11 48 52 .. .. .. Uncertainty in time = +/- 4 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 6331-00173-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 45 20.6089 DE: -16 40 15.680 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .032, .034 ) * V mag [mag]: 10.1 * B mag [mag]: 11.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (133) Cyrene approx. diameter [km]: 71 approx. diameter ["]: .035 distance from Earth [AU]: 2.79900 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 988 number of rejected observations: 108 time covered by the observations: 1908 Jan 03 - 2012 Oct 02 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.009, 66° remarks: * orbital elements for (133) Cyrene : Mean anomaly = 64.32070419 deg Arg. of pericenter = 290.38461329 deg Long. of node = 319.10062112 deg Inclination = 7.22683567 deg Eccentricity = 0.13888540 Semimajor axis = 3.06025206 AU Perihelion dist = 2.63522774 AU Mag: H = 7.88, G = 0.13 Epoch of elements : MJD 56235.00400000 TDT (2012 Nov 04.004) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 4 133 Cyrene 0h 5.1m UT 10.1 20 45 20.609-16 40 15.68TYC 6331-00173-1 11.4 13.6 71 3.7 2.799 2.208 11.64 -93.5814 -16.675 174.63 -15.43 0.0847 0.17752 -0.48356 10.09818 3.70547 0.00566 0.00155 2000 63.39943720121030.00000290.384613319.100621 7.2268360.13888540 3.0602521 2.6352277 8.0 5.00.13 RATE 1.8410610 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.034 358 1.99 0.035 0 0-1 0 056208.0020121104_0173-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 19:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org