IOTA/IOTA-ES occultation update for (500) Selinur / UCAC2 33753214 event on 2009 Jan 10, 22:51 UT Visible from Summary ------- On 2009 Jan 10 UT, the 43 km diameter asteroid (500) Selinur will occult a 11.8 mag star in the constellation Sextans for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.8 mag (the magnitude of the asteroid) for at most 4.9 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: 54 * date and approx. time of event: 2009 Jan 10, 22:45 - 2009 Jan 10, 23:01 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 2.2 * estimated maximum duration [s]: 4.9 * Moon: 100 % sunlit, 43° distance * Sun: 141° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 1.18 * 1 sigma uncertainty interval [seconds]: +/- 6.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .035", 99° ) * approx speed of asteroid's shadow [km/s]: 8.8009 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 33753214 by 500 Selinur on 2009 Jan 10 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 - 31 0 0 -40 55 13 23 1 51 0 82 -13 -40 41 12 -41 9 16 .. .. .. -41 42 35 - 30 0 0 -40 49 1 23 1 51 1 81 -14 -40 34 59 -41 3 4 .. .. .. -41 36 24 - 29 0 0 -40 42 40 23 1 51 2 81 -15 -40 28 38 -40 56 44 .. .. .. -41 30 5 - 28 0 0 -40 36 12 23 1 50 3 80 -15 -40 22 10 -40 50 16 .. .. .. -41 23 38 - 27 0 0 -40 29 36 23 1 50 4 79 -16 -40 15 34 -40 43 41 -39 42 34 -41 17 3 - 26 0 0 -40 22 52 23 1 49 4 79 -16 -40 8 50 -40 36 57 -39 35 49 -41 10 21 - 25 0 0 -40 16 1 23 1 48 5 78 -17 -40 1 58 -40 30 7 -39 28 57 -41 3 31 - 24 0 0 -40 9 3 23 1 47 6 77 -18 -39 54 59 -40 23 9 -39 21 58 -40 56 34 - 23 0 0 -40 1 57 23 1 46 7 77 -18 -39 47 53 -40 16 3 -39 14 50 -40 49 29 - 22 0 0 -39 54 44 23 1 44 7 76 -19 -39 40 40 -40 8 50 -39 7 36 -40 42 17 - 21 0 0 -39 47 24 23 1 43 8 76 -19 -39 33 19 -40 1 31 -39 0 15 -40 34 58 - 20 0 0 -39 39 57 23 1 41 9 75 -20 -39 25 52 -39 54 4 -38 52 47 -40 27 32 - 19 0 0 -39 32 22 23 1 39 10 74 -20 -39 18 17 -39 46 30 -38 45 11 -40 19 59 - 18 0 0 -39 24 42 23 1 37 10 74 -21 -39 10 36 -39 38 49 -38 37 29 -40 12 19 - 17 0 0 -39 16 54 23 1 35 11 73 -21 -39 2 48 -39 31 2 -38 29 41 -40 4 33 - 16 0 0 -39 9 0 23 1 32 12 72 -22 -38 54 54 -39 23 8 -38 21 46 -39 56 40 - 15 0 0 -39 0 59 23 1 30 13 72 -22 -38 46 53 -39 15 8 -38 13 44 -39 48 41 - 14 0 0 -38 52 53 23 1 27 14 71 -23 -38 38 46 -39 7 2 -38 5 36 -39 40 35 - 13 0 0 -38 44 40 23 1 24 14 70 -24 -38 30 33 -38 58 49 -37 57 22 -39 32 23 - 12 0 0 -38 36 21 23 1 21 15 70 -24 -38 22 13 -38 50 30 -37 49 2 -39 24 5 - 11 0 0 -38 27 56 23 1 18 16 69 -25 -38 13 48 -38 42 6 -37 40 36 -39 15 41 - 10 0 0 -38 19 25 23 1 15 17 68 -25 -38 5 17 -38 33 35 -37 32 5 -39 7 11 - 9 0 0 -38 10 49 23 1 11 17 68 -25 -37 56 40 -38 24 59 -37 23 28 -38 58 36 - 8 0 0 -38 2 7 23 1 8 18 67 -26 -37 47 58 -38 16 17 -37 14 45 -38 49 55 - 7 0 0 -37 53 19 23 1 4 19 66 -26 -37 39 11 -38 7 30 -37 5 57 -38 41 8 - 6 0 0 -37 44 27 23 1 0 20 66 -27 -37 30 18 -37 58 38 -36 57 3 -38 32 16 - 5 0 0 -37 35 29 23 0 56 21 65 -27 -37 21 20 -37 49 41 -36 48 5 -38 23 20 - 4 0 0 -37 26 27 23 0 52 21 64 -28 -37 12 17 -37 40 38 -36 39 2 -38 14 18 - 3 0 0 -37 17 19 23 0 47 22 64 -28 -37 3 10 -37 31 31 -36 29 54 -38 5 11 - 2 0 0 -37 8 7 23 0 43 23 63 -29 -36 53 57 -37 22 19 -36 20 41 -37 56 0 - 1 0 0 -36 58 51 23 0 38 24 62 -29 -36 44 41 -37 13 3 -36 11 24 -37 46 44 0 0 0 -36 49 30 23 0 33 24 62 -29 -36 35 20 -37 3 42 -36 2 2 -37 37 24 1 0 0 -36 40 5 23 0 28 25 61 -30 -36 25 55 -36 54 18 -35 52 37 -37 27 59 2 0 0 -36 30 36 23 0 23 26 60 -30 -36 16 25 -36 44 49 -35 43 7 -37 18 31 3 0 0 -36 21 3 23 0 18 27 60 -31 -36 6 52 -36 35 16 -35 33 34 -37 8 58 4 0 0 -36 11 26 23 0 12 27 59 -31 -35 57 15 -36 25 39 -35 23 57 -36 59 22 5 0 0 -36 1 46 23 0 6 28 58 -31 -35 47 35 -36 15 59 -35 14 16 -36 49 42 6 0 0 -35 52 2 23 0 1 29 58 -32 -35 37 51 -36 6 16 -35 4 32 -36 39 59 7 0 0 -35 42 16 22 59 55 30 57 -32 -35 28 4 -35 56 29 -34 54 45 -36 30 13 8 0 0 -35 32 26 22 59 48 30 56 -32 -35 18 15 -35 46 39 -34 44 55 -36 20 23 9 0 0 -35 22 33 22 59 42 31 55 -32 -35 8 22 -35 36 47 -34 35 2 -36 10 31 10 0 0 -35 12 38 22 59 36 32 55 -33 -34 58 26 -35 26 51 -34 25 6 -36 0 35 11 0 0 -35 2 40 22 59 29 33 54 -33 -34 48 28 -35 16 53 -34 15 8 -35 50 38 12 0 0 -34 52 39 22 59 23 33 53 -33 -34 38 28 -35 6 53 -34 5 7 -35 40 37 13 0 0 -34 42 37 22 59 16 34 52 -33 -34 28 25 -34 56 51 -33 55 5 -35 30 35 14 0 0 -34 32 32 22 59 9 35 51 -34 -34 18 21 -34 46 46 -33 45 0 -35 20 31 15 0 0 -34 22 26 22 59 2 36 51 -34 -34 8 14 -34 36 40 -33 34 54 -35 10 24 16 0 0 -34 12 18 22 58 54 36 50 -34 -33 58 6 -34 26 32 -33 24 46 -35 0 16 17 0 0 -34 2 8 22 58 47 37 49 -34 -33 47 57 -34 16 22 -33 14 36 -34 50 7 18 0 0 -33 51 58 22 58 40 38 48 -34 -33 37 46 -34 6 11 -33 4 26 -34 39 56 19 0 0 -33 41 46 22 58 32 38 47 -35 -33 27 34 -33 55 59 -32 54 14 -34 29 44 20 0 0 -33 31 33 22 58 24 39 46 -35 -33 17 21 -33 45 46 -32 44 1 -34 19 31 21 0 0 -33 21 19 22 58 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13 -31 56 29 35 0 0 -30 58 33 22 56 13 49 31 -35 -30 44 24 -31 12 45 -30 11 9 -31 46 24 36 0 0 -30 48 30 22 56 4 49 30 -35 -30 34 21 -31 2 42 -30 1 7 -31 36 20 37 0 0 -30 38 30 22 55 54 50 28 -35 -30 24 21 -30 52 41 -29 51 7 -31 26 19 38 0 0 -30 28 32 22 55 44 50 27 -34 -30 14 23 -30 42 43 -29 41 9 -31 16 20 39 0 0 -30 18 36 22 55 34 51 26 -34 -30 4 28 -30 32 47 -29 31 15 -31 6 24 40 0 0 -30 8 43 22 55 24 51 24 -34 -29 54 35 -30 22 54 -29 21 23 -30 56 30 41 0 0 -29 58 53 22 55 14 52 23 -34 -29 44 46 -30 13 3 -29 11 34 -30 46 39 42 0 0 -29 49 7 22 55 4 52 22 -34 -29 34 59 -30 3 16 -29 1 48 -30 36 51 43 0 0 -29 39 23 22 54 54 53 20 -33 -29 25 16 -29 53 33 -28 52 5 -30 27 7 44 0 0 -29 29 43 22 54 44 53 19 -33 -29 15 36 -29 43 52 -28 42 26 -30 17 26 45 0 0 -29 20 7 22 54 34 54 17 -33 -29 6 0 -29 34 16 -28 32 50 -30 7 49 46 0 0 -29 10 34 22 54 23 54 16 -33 -28 56 28 -29 24 43 -28 23 19 -29 58 15 47 0 0 -29 1 5 22 54 13 54 14 -32 -28 46 59 -29 15 14 -28 13 51 -29 48 45 48 0 0 -28 51 41 22 54 2 55 13 -32 -28 37 35 -29 5 49 -28 4 28 -29 39 20 49 0 0 -28 42 21 22 53 52 55 11 -32 -28 28 15 -28 56 29 -27 55 9 -29 29 59 50 0 0 -28 33 5 22 53 41 55 10 -31 -28 19 0 -28 47 13 -27 45 54 -29 20 42 51 0 0 -28 23 54 22 53 31 56 8 -31 -28 9 50 -28 38 2 -27 36 44 -29 11 30 52 0 0 -28 14 48 22 53 20 56 6 -31 -28 0 44 -28 28 55 -27 27 39 -29 2 23 53 0 0 -28 5 47 22 53 9 56 5 -30 -27 51 43 -28 19 54 -27 18 39 -28 53 21 54 0 0 -27 56 52 22 52 59 56 3 -30 -27 42 48 -28 10 58 -27 9 44 -28 44 24 55 0 0 -27 48 1 22 52 48 57 1 -29 -27 33 57 -28 2 7 -27 0 55 -28 35 33 56 0 0 -27 39 16 22 52 37 57 359 -29 -27 25 13 -27 53 22 -26 52 11 -28 26 47 57 0 0 -27 30 37 22 52 26 57 358 -29 -27 16 34 -27 44 42 -26 43 33 -28 18 6 58 0 0 -27 22 3 22 52 15 57 356 -28 -27 8 1 -27 36 8 -26 35 0 -28 9 32 59 0 0 -27 13 36 22 52 4 57 354 -28 -26 59 33 -27 27 41 -26 26 34 -28 1 3 60 0 0 -27 5 15 22 51 54 57 352 -27 -26 51 12 -27 19 19 -26 18 14 -27 52 41 61 0 0 -26 57 0 22 51 43 57 351 -27 -26 42 58 -27 11 4 -26 10 0 -27 44 25 62 0 0 -26 48 51 22 51 32 57 349 -26 -26 34 49 -27 2 55 -26 1 52 -27 36 15 63 0 0 -26 40 49 22 51 21 57 347 -26 -26 26 48 -26 54 52 -25 53 51 -27 28 12 64 0 0 -26 32 54 22 51 10 57 345 -25 -26 18 53 -26 46 57 -25 45 57 -27 20 15 65 0 0 -26 25 5 22 50 59 57 344 -25 -26 11 5 -26 39 8 -25 38 10 -27 12 26 66 0 0 -26 17 24 22 50 48 57 342 -24 -26 3 24 -26 31 27 -25 30 30 -27 4 44 67 0 0 -26 9 50 22 50 37 57 340 -23 -25 55 50 -26 23 52 -25 22 57 -26 57 8 68 0 0 -26 2 23 22 50 26 56 339 -23 -25 48 24 -26 16 25 -25 15 31 -26 49 41 69 0 0 -25 55 4 22 50 15 56 337 -22 -25 41 5 -26 9 5 -25 8 13 -26 42 20 70 0 0 -25 47 52 22 50 5 56 335 -22 -25 33 53 -26 1 53 -25 1 2 -26 35 8 71 0 0 -25 40 48 22 49 54 56 334 -21 -25 26 50 -25 54 49 -24 53 59 -26 28 3 72 0 0 -25 33 52 22 49 43 55 332 -21 -25 19 54 -25 47 53 -24 47 4 -26 21 5 73 0 0 -25 27 4 22 49 32 55 330 -20 -25 13 6 -25 41 4 -24 40 17 -26 14 16 74 0 0 -25 20 24 22 49 21 55 329 -19 -25 6 26 -25 34 24 -24 33 38 -26 7 35 75 0 0 -25 13 53 22 49 11 54 327 -19 -24 59 55 -25 27 52 -24 27 7 -26 1 3 76 0 0 -25 7 29 22 49 0 54 326 -18 -24 53 32 -25 21 29 -24 20 45 -25 54 39 77 0 0 -25 1 14 22 48 50 54 324 -17 -24 47 18 -25 15 14 -24 14 31 -25 48 23 78 0 0 -24 55 8 22 48 39 53 323 -17 -24 41 12 -25 9 7 -24 8 26 -25 42 16 79 0 0 -24 49 11 22 48 28 53 322 -16 -24 35 15 -25 3 10 -24 2 29 -25 36 17 80 0 0 -24 43 22 22 48 18 52 320 -15 -24 29 26 -24 57 21 -23 56 42 -25 30 28 81 0 0 -24 37 43 22 48 8 52 319 -15 -24 23 47 -24 51 41 -23 51 3 -25 24 48 82 0 0 -24 32 12 22 47 57 51 318 -14 -24 18 17 -24 46 10 -23 45 33 -25 19 16 83 0 0 -24 26 51 22 47 47 51 316 -13 -24 12 56 -24 40 49 -23 40 13 -25 13 54 84 0 0 -24 21 39 22 47 37 50 315 -13 -24 7 44 -24 35 36 -23 35 1 -25 8 41 85 0 0 -24 16 37 22 47 27 50 314 -12 -24 2 42 -24 30 34 -23 30 0 -25 3 38 86 0 0 -24 11 43 22 47 17 49 313 -11 -23 57 49 -24 25 40 -23 25 7 -24 58 44 87 0 0 -24 7 0 22 47 7 48 312 -11 -23 53 5 -24 20 57 -23 20 25 -24 54 0 88 0 0 -24 2 26 22 46 57 48 311 -10 -23 48 32 -24 16 23 -23 15 51 -24 49 26 89 0 0 -23 58 2 22 46 47 47 310 -9 -23 44 8 -24 11 59 -23 11 28 -24 45 1 90 0 0 -23 53 48 22 46 38 46 308 -8 -23 39 54 -24 7 44 -23 7 15 -24 40 46 91 0 0 -23 49 44 22 46 28 46 307 -8 -23 35 50 -24 3 40 -23 3 11 -24 36 42 92 0 0 -23 45 50 22 46 18 45 306 -7 -23 31 57 -23 59 46 -22 59 18 -24 32 47 93 0 0 -23 42 6 22 46 9 44 306 -6 -23 28 13 -23 56 2 -22 55 34 -24 29 3 94 0 0 -23 38 33 22 46 0 44 305 -5 -23 24 39 -23 52 28 -22 52 1 -24 25 29 95 0 0 -23 35 9 22 45 51 43 304 -5 -23 21 16 -23 49 5 -22 48 38 -24 22 5 96 0 0 -23 31 56 22 45 42 42 303 -4 -23 18 3 -23 45 52 -22 45 26 -24 18 51 97 0 0 -23 28 54 22 45 33 42 302 -3 -23 15 1 -23 42 49 -22 42 24 -24 15 49 98 0 0 -23 26 2 22 45 24 41 301 -2 -23 12 9 -23 39 57 -22 39 32 -24 12 56 99 0 0 -23 23 21 22 45 15 40 300 -1 -23 9 28 -23 37 16 -22 36 51 -24 10 15 100 0 0 -23 20 50 22 45 7 39 300 -1 -23 6 58 -23 34 45 -22 34 21 -24 7 44 Uncertainty in time = +/- 6 secs [Prediction of 2008 Nov 4.0] Data for the target star ------------------------ * name: UCAC2 33753214 * constellation : Sextans * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 57 21.2165 DE: +05 46 14.188 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .032, .032 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (500) Selinur approx. diameter [km]: 43 approx. diameter ["]: .030 distance from Earth [AU]: 2.00400 * orbital information: orbit source: Preston date of fit: 2008 Nov 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 664 number of rejected observations: 80 time covered by the observations: 1903 Jan 16 - 2008 Mar 02 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.016, 118° remarks: * orbital elements for (500) Selinur : Mean anomaly = 118.97797695 deg Arg. of pericenter = 74.97209318 deg Long. of node = 290.02965821 deg Inclination = 9.76448915 deg Eccentricity = 0.14478233 Semimajor axis = 2.61391102 AU Perihelion dist = 2.23546288 AU Mag: H = 9.17, G = 0.15 Epoch of elements : MJD 54841.95300000 TDT (2009 Jan 10.953) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 10 500 Selinur 22h 51.7m UT 11.8 9 57 21.217 5 46 14.19UCAC2 33753214 0.0 13.8 43 4.9 2.004 -1.448 -3.08 55.8178 5.771 -160.98 -21.82 22.8621 0.07726 -0.53707 -4.91752 -0.70274 -0.00331 0.00175 2000 118.5224962009 1 9.00000 74.972093290.029658 9.7644890.14478233 2.6139110 2.2354629 9.3 5.00.15 RATE 2.3322110 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.035 99 2.18 0.035 0 54774.5020090110_753214 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 04, 05:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org