IOTA/IOTA-ES occultation update for (392) Wilhelmina / TYC 0155-01849-1 event on 2012 Dec 08, 05:31 UT Visible from Brazil, Bolivia, Chile Summary ------- On 2012 Dec 08 UT, the 59 km diameter asteroid (392) Wilhelmina will occult a 10.5 mag star in the constellation Monoceros for observers along a path across Brazil, Bolivia, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 13.8 mag (the magnitude of the asteroid) for at most 5.4 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: 81 * date and approx. time of event: 2012 Dec 08, 05:23 - 2012 Dec 08, 05:40 UT * geocentric midpoint of event [JD]: 2456269.73033333 * magnitude of target star: 10.5 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 5.4 * Moon: 34 % sunlit, 84° distance * Sun: 150° distance * rough path description: Brazil, Bolivia, Chile The occultation path -------------------- * approximate projected width [km]: 63 * 1 sigma uncertainty interval [path widths]: +/- 0.66 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .029", 93° ) * approx speed of asteroid's shadow [km/s]: 10.8641 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0155-01849-1 by 392 Wilhelmina on 2012 Dec 8 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 -149 0 0 -42 59 56 5 40 52 0 85 -3 -42 42 54 .. .. .. -42 20 28 .. .. .. -148 0 0 -42 55 43 5 40 52 1 84 -4 -42 38 40 -43 12 47 -42 16 13 -43 35 22 -147 0 0 -42 51 10 5 40 52 2 83 -5 -42 34 7 -43 8 15 -42 11 38 -43 30 52 -146 0 0 -42 46 18 5 40 52 2 83 -5 -42 29 14 -43 3 24 -42 6 44 -43 26 2 -145 0 0 -42 41 7 5 40 51 3 82 -6 -42 24 1 -42 58 14 -42 1 31 -43 20 52 -144 0 0 -42 35 36 5 40 51 4 81 -6 -42 18 30 -42 52 44 -41 55 58 -43 15 24 -143 0 0 -42 29 45 5 40 50 4 81 -7 -42 12 38 -42 46 55 -41 50 5 -43 9 36 -142 0 0 -42 23 36 5 40 50 5 80 -8 -42 6 27 -42 40 46 -41 43 53 -43 3 29 -141 0 0 -42 17 6 5 40 49 6 79 -8 -41 59 57 -42 34 18 -41 37 21 -42 57 2 -140 0 0 -42 10 17 5 40 48 7 79 -9 -41 53 7 -42 27 30 -41 30 29 -42 50 16 -139 0 0 -42 3 9 5 40 47 7 78 -10 -41 45 57 -42 20 23 -41 23 18 -42 43 10 -138 0 0 -41 55 41 5 40 46 8 77 -10 -41 38 28 -42 12 56 -41 15 47 -42 35 45 -137 0 0 -41 47 54 5 40 45 9 77 -11 -41 30 39 -42 5 10 -41 7 57 -42 28 1 -136 0 0 -41 39 47 5 40 43 10 76 -11 -41 22 31 -41 57 5 -40 59 47 -42 19 57 -135 0 0 -41 31 21 5 40 42 10 75 -12 -41 14 3 -41 48 40 -40 51 17 -42 11 34 -134 0 0 -41 22 35 5 40 40 11 75 -13 -41 5 16 -41 39 55 -40 42 28 -42 2 51 -133 0 0 -41 13 29 5 40 39 12 74 -13 -40 56 9 -41 30 51 -40 33 19 -41 53 49 -132 0 0 -41 4 4 5 40 37 13 73 -14 -40 46 43 -41 21 27 -40 23 51 -41 44 28 -131 0 0 -40 54 20 5 40 35 14 73 -15 -40 36 57 -41 11 44 -40 14 3 -41 34 47 -130 0 0 -40 44 15 5 40 33 14 72 -15 -40 26 51 -41 1 42 -40 3 55 -41 24 46 -129 0 0 -40 33 52 5 40 31 15 71 -16 -40 16 26 -40 51 20 -39 53 28 -41 14 26 -128 0 0 -40 23 9 5 40 28 16 71 -16 -40 5 41 -40 40 38 -39 42 41 -41 3 47 -127 0 0 -40 12 6 5 40 26 17 70 -17 -39 54 37 -40 29 37 -39 31 34 -40 52 48 -126 0 0 -40 0 44 5 40 24 17 69 -18 -39 43 13 -40 18 16 -39 20 8 -40 41 29 -125 0 0 -39 49 2 5 40 21 18 69 -18 -39 31 29 -40 6 36 -39 8 23 -40 29 52 -124 0 0 -39 37 1 5 40 18 19 68 -19 -39 19 26 -39 54 37 -38 56 18 -40 17 54 -123 0 0 -39 24 40 5 40 15 20 67 -19 -39 7 4 -39 42 18 -38 43 53 -40 5 38 -122 0 0 -39 12 0 5 40 12 20 67 -20 -38 54 22 -39 29 40 -38 31 9 -39 53 2 -121 0 0 -38 59 1 5 40 9 21 66 -21 -38 41 21 -39 16 42 -38 18 6 -39 40 6 -120 0 0 -38 45 42 5 40 6 22 65 -21 -38 28 1 -39 3 25 -38 4 43 -39 26 52 -119 0 0 -38 32 4 5 40 3 23 65 -22 -38 14 21 -38 49 49 -37 51 1 -39 13 18 -118 0 0 -38 18 6 5 39 59 24 64 -23 -38 0 22 -38 35 53 -37 37 0 -38 59 25 -117 0 0 -38 3 50 5 39 56 24 63 -23 -37 46 4 -38 21 39 -37 22 39 -38 45 12 -116 0 0 -37 49 15 5 39 52 25 63 -24 -37 31 26 -38 7 5 -37 7 59 -38 30 41 -115 0 0 -37 34 20 5 39 48 26 62 -24 -37 16 30 -37 52 12 -36 53 1 -38 15 50 -114 0 0 -37 19 6 5 39 44 27 61 -25 -37 1 15 -37 37 0 -36 37 43 -38 0 41 -113 0 0 -37 3 34 5 39 40 28 61 -25 -36 45 40 -37 21 30 -36 22 7 -37 45 13 -112 0 0 -36 47 43 5 39 36 29 60 -26 -36 29 48 -37 5 40 -36 6 11 -37 29 26 -111 0 0 -36 31 33 5 39 31 29 59 -27 -36 13 36 -36 49 32 -35 49 58 -37 13 20 -110 0 0 -36 15 5 5 39 27 30 59 -27 -35 57 6 -36 33 6 -35 33 25 -36 56 56 -109 0 0 -35 58 18 5 39 22 31 58 -28 -35 40 18 -36 16 21 -35 16 34 -36 40 13 -108 0 0 -35 41 13 5 39 18 32 57 -28 -35 23 11 -35 59 17 -34 59 25 -36 23 12 -107 0 0 -35 23 50 5 39 13 33 57 -29 -35 5 46 -35 41 56 -34 41 58 -36 5 53 -106 0 0 -35 6 9 5 39 8 33 56 -29 -34 48 3 -35 24 17 -34 24 13 -35 48 16 -105 0 0 -34 48 10 5 39 2 34 55 -30 -34 30 3 -35 6 19 -34 6 11 -35 30 21 -104 0 0 -34 29 53 5 38 57 35 55 -31 -34 11 44 -34 48 5 -33 47 50 -35 12 9 -103 0 0 -34 11 19 5 38 52 36 54 -31 -33 53 9 -34 29 32 -33 29 13 -34 53 38 -102 0 0 -33 52 28 5 38 46 37 53 -32 -33 34 16 -34 10 43 -33 10 18 -34 34 51 -101 0 0 -33 33 20 5 38 40 38 52 -32 -33 15 6 -33 51 36 -32 51 6 -34 15 46 -100 0 0 -33 13 55 5 38 34 38 52 -33 -32 55 40 -33 32 13 -32 31 37 -33 56 25 - 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57 0 0 -16 20 14 5 32 28 70 350 -42 -16 1 43 -16 38 48 -15 37 19 -17 3 23 - 56 0 0 -15 55 9 5 32 18 70 347 -42 -15 36 38 -16 13 42 -15 12 16 -16 38 15 - 55 0 0 -15 30 8 5 32 7 70 344 -42 -15 11 38 -15 48 40 -14 47 17 -16 13 12 - 54 0 0 -15 5 12 5 31 57 70 341 -42 -14 46 43 -15 23 43 -14 22 23 -15 48 13 - 53 0 0 -14 40 21 5 31 47 70 338 -41 -14 21 53 -14 58 51 -13 57 35 -15 23 20 - 52 0 0 -14 15 36 5 31 36 70 335 -41 -13 57 9 -14 34 5 -13 32 52 -14 58 32 - 51 0 0 -13 50 57 5 31 26 70 332 -41 -13 32 32 -14 9 25 -13 8 16 -14 33 51 - 50 0 0 -13 26 26 5 31 16 70 329 -40 -13 8 2 -13 44 52 -12 43 47 -14 9 17 - 49 0 0 -13 2 2 5 31 5 70 326 -40 -12 43 39 -13 20 27 -12 19 26 -13 44 50 - 48 0 0 -12 37 46 5 30 55 70 323 -40 -12 19 24 -12 56 10 -11 55 13 -13 20 31 - 47 0 0 -12 13 39 5 30 44 69 320 -39 -11 55 18 -12 32 2 -11 31 9 -12 56 21 - 46 0 0 -11 49 41 5 30 34 69 317 -39 -11 31 22 -12 8 2 -11 7 14 -12 32 20 - 45 0 0 -11 25 53 5 30 24 69 315 -38 -11 7 35 -11 44 13 -10 43 29 -12 8 28 - 44 0 0 -11 2 15 5 30 13 68 312 -38 -10 43 58 -11 20 33 -10 19 55 -11 44 47 - 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5 53 44 5 27 54 59 288 -30 - 5 35 50 - 6 11 41 - 5 12 15 - 6 35 25 - 29 0 0 - 5 33 35 5 27 45 58 287 -29 - 5 15 43 - 5 51 30 - 4 52 10 - 6 15 12 - 28 0 0 - 5 13 44 5 27 35 57 286 -29 - 4 55 53 - 5 31 37 - 4 32 22 - 5 55 17 - 27 0 0 - 4 54 10 5 27 26 57 285 -28 - 4 36 21 - 5 12 2 - 4 12 52 - 5 35 39 - 26 0 0 - 4 34 54 5 27 17 56 284 -27 - 4 17 6 - 4 52 44 - 3 53 40 - 5 16 19 - 25 0 0 - 4 15 57 5 27 8 55 283 -27 - 3 58 11 - 4 33 45 - 3 34 46 - 4 57 18 - 24 0 0 - 3 57 18 5 26 59 54 282 -26 - 3 39 33 - 4 15 4 - 3 16 11 - 4 38 35 - 23 0 0 - 3 38 58 5 26 50 53 281 -25 - 3 21 15 - 3 56 43 - 2 57 55 - 4 20 11 - 22 0 0 - 3 20 57 5 26 42 52 281 -24 - 3 3 16 - 3 38 40 - 2 39 58 - 4 2 7 - 21 0 0 - 3 3 16 5 26 33 51 280 -24 - 2 45 36 - 3 20 57 - 2 22 20 - 3 44 22 - 20 0 0 - 2 45 54 5 26 24 50 279 -23 - 2 28 16 - 3 3 34 - 2 5 3 - 3 26 57 - 19 0 0 - 2 28 53 5 26 16 50 279 -22 - 2 11 17 - 2 46 32 - 1 48 5 - 3 9 52 - 18 0 0 - 2 12 12 5 26 8 49 278 -22 - 1 54 37 - 2 29 49 - 1 31 28 - 2 53 7 - 17 0 0 - 1 55 52 5 26 0 48 278 -21 - 1 38 19 - 2 13 27 - 1 15 11 - 2 36 43 - 16 0 0 - 1 39 53 5 25 52 47 277 -20 - 1 22 21 - 1 57 27 - 0 59 16 - 2 20 41 - 15 0 0 - 1 24 15 5 25 44 46 277 -19 - 1 6 44 - 1 41 47 - 0 43 41 - 2 4 59 - 14 0 0 - 1 8 58 5 25 36 45 277 -18 - 0 51 29 - 1 26 29 - 0 28 28 - 1 49 39 - 13 0 0 - 0 54 3 5 25 28 44 276 -18 - 0 36 36 - 1 11 32 - 0 13 36 - 1 34 40 - 12 0 0 - 0 39 30 5 25 21 43 276 -17 - 0 22 4 - 0 56 57 0 0 54 - 1 20 4 - 11 0 0 - 0 25 18 5 25 13 42 276 -16 - 0 7 54 - 0 42 45 0 15 2 - 1 5 49 - 10 0 0 - 0 11 30 5 25 6 41 275 -15 0 5 53 - 0 28 55 0 28 47 - 0 51 57 - 9 0 0 0 1 57 5 24 59 40 275 -15 0 19 19 - 0 15 27 0 42 11 - 0 38 27 - 8 0 0 0 15 1 5 24 52 39 275 -14 0 32 21 - 0 2 22 0 55 11 - 0 25 20 - 7 0 0 0 27 42 5 24 45 38 275 -13 0 45 1 0 10 21 1 7 49 - 0 12 36 - 6 0 0 0 40 0 5 24 39 37 274 -12 0 57 17 0 22 40 1 20 4 - 0 0 16 - 5 0 0 0 51 54 5 24 32 36 274 -11 1 9 11 0 34 36 1 31 56 0 11 42 - 4 0 0 1 3 26 5 24 26 36 274 -10 1 20 41 0 46 8 1 43 25 0 23 16 - 3 0 0 1 14 33 5 24 20 35 274 -10 1 31 48 0 57 17 1 54 30 0 34 27 - 2 0 0 1 25 18 5 24 14 34 274 -9 1 42 31 1 8 3 2 5 11 0 45 14 - 1 0 0 1 35 38 5 24 8 33 274 -8 1 52 50 1 18 24 2 15 29 0 55 36 0 0 0 1 45 34 5 24 2 32 273 -7 2 2 45 1 28 21 2 25 23 1 5 35 1 0 0 1 55 6 5 23 57 31 273 -6 2 12 16 1 37 55 2 34 53 1 15 10 2 0 0 2 4 14 5 23 51 30 273 -5 2 21 23 1 47 4 2 43 59 1 24 20 3 0 0 2 12 58 5 23 46 29 273 -5 2 30 6 1 55 48 2 52 40 1 33 6 4 0 0 2 21 17 5 23 41 28 273 -4 2 38 24 2 4 8 3 0 57 1 41 27 5 0 0 2 29 11 5 23 36 27 273 -3 2 46 18 2 12 3 3 8 50 1 49 23 6 0 0 2 36 41 5 23 31 26 273 -2 2 53 47 2 19 34 3 16 18 1 56 55 7 0 0 2 43 46 5 23 26 25 273 -1 3 0 51 2 26 39 3 23 21 2 4 2 8 0 0 2 50 26 5 23 22 24 273 0 3 7 30 2 33 20 3 29 59 2 10 43 Uncertainty in time = +/- 4 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 0155-01849-1 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 39 17.4317 DE: +03 51 21.732 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .025 ) * V mag [mag]: 10.5 * B mag [mag]: 10.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (392) Wilhelmina approx. diameter [km]: 59 approx. diameter ["]: .046 distance from Earth [AU]: 1.78700 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1016 number of rejected observations: 60 time covered by the observations: 1933 Oct 23 - 2012 Nov 29 1 sigma uncertainty ellipse (major, minor, PA): 0.025, 0.013, 97° remarks: * orbital elements for (392) Wilhelmina : Mean anomaly = 53.34328104 deg Arg. of pericenter = 174.71245021 deg Long. of node = 209.86521192 deg Inclination = 14.32350983 deg Eccentricity = 0.14166958 Semimajor axis = 2.88470694 AU Perihelion dist = 2.47603172 AU Mag: H = 9.71, G = 0.15 Epoch of elements : MJD 56269.23000000 TDT (2012 Dec 08.230) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 8 392 Wilhelmina 5h 31.7m UT 10.5 6 39 17.432 3 51 21.73TYC 0155-01849-1 10.8 13.8 59 5.4 1.787 -1.856 -11.84 -60.4796 3.859 95.07 -22.76 5.5280 0.13263 -0.31144 -5.63970 -2.40729 -0.00231 0.00195 2000 51.48653220121129.00000174.712450209.865212 14.3235100.14166958 2.8847069 2.4760317 9.7 5.00.15 RATE 2.0116460 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.029 93 1.66 0.030 0 0-3 2 056264.0020121208_1849-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 22:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org