IOTA/IOTA-ES occultation update for (2685) Masursky / TYC 0731-01008-1 event on 2012 Nov 27, 01:49 UT Visible from Europe, Venezuela, Colombia Summary ------- On 2012 Nov 27 UT, the 13 km diameter asteroid (2685) Masursky will occult a 10.3 mag star in the constellation Orion for observers along a path across Europe, Venezuela, Colombia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 15.7 mag (the magnitude of the asteroid) for at most 1.4 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: 11 * date and approx. time of event: 2012 Nov 27, 01:39 - 2012 Nov 27, 01:58 UT * geocentric midpoint of event [JD]: 2456258.57557083 * magnitude of target star: 10.3 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 1.4 * Moon: 98 % sunlit, 48° distance * Sun: 147° distance * rough path description: Europe, Venezuela, Colombia The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 6.12 * 1 sigma uncertainty interval [seconds]: +/- 9.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .086 +/- .061) * 1 sigma uncertainty ellipse (major, minor, PA): ( .086", .061", 95° ) * approx speed of asteroid's shadow [km/s]: 8.7780 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0731-01008-1 by 2685 Masursky on 2012 Nov 27 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 - 89 52 13 0 0 0 1 58 24 1 81 -30 - 90 18 24 - 89 26 54 ... .. .. ... .. .. - 85 3 20 1 0 0 1 58 19 6 81 -35 - 85 22 20 - 84 44 40 - 89 51 9 - 81 17 17 Latitude Latitude Latitude Latitude - 85 0 0 1 0 48 1 58 19 6 81 -35 1 5 21 0 56 16 2 1 19 .. .. .. - 84 0 0 1 15 44 1 58 18 7 81 -36 1 20 17 1 11 11 2 16 24 0 15 52 - 83 0 0 1 31 29 1 58 15 8 81 -37 1 36 3 1 26 55 2 32 21 0 31 26 - 82 0 0 1 48 4 1 58 13 9 81 -38 1 52 39 1 43 29 2 49 7 0 47 50 - 81 0 0 2 5 28 1 58 10 10 81 -39 2 10 4 2 0 53 3 6 45 1 5 3 - 80 0 0 2 23 43 1 58 7 11 81 -40 2 28 20 2 19 6 3 25 12 1 23 5 - 79 0 0 2 42 47 1 58 4 12 81 -41 2 47 25 2 38 10 3 44 31 1 41 56 - 78 0 0 3 2 42 1 58 0 13 82 -42 3 7 21 2 58 3 4 4 40 2 1 36 - 77 0 0 3 23 26 1 57 56 14 82 -43 3 28 6 3 18 46 4 25 39 2 22 6 - 76 0 0 3 45 0 1 57 52 15 82 -44 3 49 41 3 40 19 4 47 29 2 43 25 - 75 0 0 4 7 24 1 57 47 16 82 -45 4 12 6 4 2 42 5 10 9 3 5 33 - 74 0 0 4 30 38 1 57 42 17 82 -46 4 35 21 4 25 54 5 33 40 3 28 30 - 73 0 0 4 54 41 1 57 37 18 82 -47 4 59 26 4 49 56 5 58 1 3 52 16 - 72 0 0 5 19 34 1 57 32 19 82 -49 5 24 21 5 14 48 6 23 13 4 16 52 - 71 0 0 5 45 17 1 57 26 20 83 -50 5 50 5 5 40 30 6 49 15 4 42 17 - 70 0 0 6 11 50 1 57 20 21 83 -51 6 16 39 6 7 1 7 16 8 5 8 31 - 69 0 0 6 39 12 1 57 14 22 83 -52 6 44 3 6 34 22 7 43 51 5 35 33 - 68 0 0 7 7 24 1 57 7 23 83 -53 7 12 17 7 2 32 8 12 24 6 3 25 - 67 0 0 7 36 26 1 57 0 24 84 -54 7 41 20 7 31 32 8 41 47 6 32 5 - 66 0 0 8 6 16 1 56 53 25 84 -55 8 11 12 8 1 21 9 12 0 7 1 34 - 65 0 0 8 36 56 1 56 45 26 84 -56 8 41 53 8 31 59 9 43 3 7 31 52 - 64 0 0 9 8 24 1 56 37 27 85 -57 9 13 23 9 3 25 10 14 55 8 2 57 - 63 0 0 9 40 41 1 56 29 28 85 -58 9 45 42 9 35 41 10 47 37 8 34 51 - 62 0 0 10 13 47 1 56 20 29 85 -59 10 18 50 10 8 44 11 21 8 9 7 33 - 61 0 0 10 47 41 1 56 12 30 86 -60 10 52 45 10 42 36 11 55 28 9 41 2 - 60 0 0 11 22 22 1 56 3 31 86 -61 11 27 29 11 17 16 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76 15 5 77 18 23 75 21 24 85 0 0 76 19 5 1 39 31 11 264 -15 76 23 30 76 14 40 77 17 59 75 20 57 86 0 0 76 18 28 1 39 30 11 265 -15 76 22 53 76 14 2 77 17 23 75 20 18 87 0 0 76 17 39 1 39 29 10 266 -15 76 22 4 76 13 13 77 16 37 75 19 27 88 0 0 76 16 38 1 39 29 10 267 -15 76 21 4 76 12 12 77 15 39 75 18 23 89 0 0 76 15 25 1 39 28 10 268 -14 76 19 51 76 10 59 77 14 30 75 17 7 90 0 0 76 14 1 1 39 28 10 269 -14 76 18 27 76 9 35 77 13 10 75 15 38 91 0 0 76 12 24 1 39 27 9 270 -14 76 16 51 76 7 58 77 11 39 75 13 57 92 0 0 76 10 36 1 39 26 9 270 -14 76 15 3 76 6 9 77 9 56 75 12 3 93 0 0 76 8 35 1 39 26 9 271 -14 76 13 3 76 4 8 77 8 2 75 9 56 94 0 0 76 6 22 1 39 25 9 272 -13 76 10 50 76 1 54 77 5 56 75 7 36 95 0 0 76 3 56 1 39 24 8 273 -13 76 8 25 75 59 28 77 3 39 75 5 2 96 0 0 76 1 18 1 39 24 8 274 -13 76 5 48 75 56 49 77 1 9 75 2 16 97 0 0 75 58 27 1 39 23 8 275 -13 76 2 58 75 53 57 76 58 28 74 59 16 98 0 0 75 55 24 1 39 23 8 276 -12 75 59 54 75 50 53 76 55 34 74 56 3 99 0 0 75 52 7 1 39 22 7 277 -12 75 56 38 75 47 35 76 52 28 74 52 36 100 0 0 75 48 36 1 39 22 7 278 -12 75 53 9 75 44 4 76 49 9 74 48 55 101 0 0 75 44 53 1 39 21 7 279 -12 75 49 26 75 40 20 76 45 37 74 44 59 102 0 0 75 40 55 1 39 21 7 280 -12 75 45 30 75 36 21 76 41 53 74 40 49 103 0 0 75 36 44 1 39 20 6 281 -11 75 41 19 75 32 9 76 37 55 74 36 25 104 0 0 75 32 18 1 39 20 6 282 -11 75 36 55 75 27 42 76 33 44 74 31 45 105 0 0 75 27 38 1 39 19 6 283 -11 75 32 15 75 23 1 76 29 19 74 26 51 106 0 0 75 22 43 1 39 19 6 284 -11 75 27 22 75 18 4 76 24 40 74 21 41 107 0 0 75 17 33 1 39 19 5 285 -10 75 22 13 75 12 53 76 19 46 .. .. .. 108 0 0 75 12 7 1 39 18 5 286 -10 75 16 48 75 7 26 76 14 38 .. .. .. 109 0 0 75 6 26 1 39 18 5 287 -10 75 11 9 75 1 44 76 9 15 .. .. .. 110 0 0 75 0 28 1 39 17 4 288 -10 75 5 12 74 55 45 76 3 36 .. .. .. 111 0 0 74 54 14 1 39 17 4 289 -9 74 59 0 74 49 29 75 57 42 .. .. .. 112 0 0 74 47 44 1 39 17 4 290 -9 74 52 31 74 42 57 75 51 32 .. .. .. 113 0 0 74 40 55 1 39 16 4 291 -9 74 45 44 74 36 7 75 45 5 .. .. .. 114 0 0 74 33 50 1 39 16 3 292 -9 74 38 40 74 29 0 75 38 21 .. .. .. 115 0 0 74 26 25 1 39 16 3 293 -8 74 31 17 74 21 34 75 31 20 .. .. .. 116 0 0 74 18 43 1 39 16 3 294 -8 74 23 36 74 13 49 75 24 1 .. .. .. 117 0 0 74 10 40 1 39 15 2 295 -8 74 15 36 74 5 45 75 16 23 .. .. .. 118 0 0 74 2 19 1 39 15 2 296 -8 74 7 16 73 57 22 75 8 27 .. .. .. 119 0 0 73 53 37 1 39 15 2 297 -7 73 58 36 73 48 38 75 0 11 .. .. .. 120 0 0 73 44 34 1 39 15 2 297 -7 73 49 35 73 39 33 74 51 35 .. .. .. 121 0 0 73 35 9 1 39 15 1 298 -7 73 40 13 73 30 6 74 42 39 .. .. .. 122 0 0 73 25 23 1 39 15 1 299 -7 73 30 28 73 20 18 74 33 21 .. .. .. 123 0 0 73 15 13 1 39 15 1 300 -6 73 20 21 73 10 6 74 23 42 .. .. .. 124 0 0 73 4 41 1 39 15 0 301 -6 73 9 50 72 59 31 74 13 39 .. .. .. Uncertainty in time = +/- 11 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 0731-01008-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 19 07.7584 DE: +08 58 03.541 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .040, .041 ) * V mag [mag]: 10.3 * B mag [mag]: 11.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2685) Masursky approx. diameter [km]: 13 approx. diameter ["]: .012 distance from Earth [AU]: 1.51600 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 819 number of rejected observations: 16 time covered by the observations: 1973 Aug 28 - 2011 Dec 25 1 sigma uncertainty ellipse (major, minor, PA): 0.076, 0.045, 97° remarks: * orbital elements for (2685) Masursky : Mean anomaly = 310.86619410 deg Arg. of pericenter = 287.75700481 deg Long. of node = 215.39990768 deg Inclination = 12.12910632 deg Eccentricity = 0.11015152 Semimajor axis = 2.57001150 AU Perihelion dist = 2.28692083 AU Mag: H = 12.03, G = 0.15 Epoch of elements : MJD 56258.07600000 TDT (2012 Nov 27.076) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 27 2685 Masursky 1h 48.8m UT 10.3 6 19 7.758 8 58 3.54TYC 0731-01008-1 11.7 15.7 13 1.4 1.516 -1.537 -17.58 1.1898 8.973 149.71 -21.17 1.8137 -0.37351 0.48077 -3.92028 -3.02966 -0.00280 0.00133 2000 308.93423620121119.00000287.757005215.399908 12.1291060.11015152 2.5700115 2.286920812.1 5.00.15 RATE 2.3922220 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.086 0.061 95 7.12 0.072 0 0 4 1 056247.0020121127_1008-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 03:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org