IOTA/IOTA-ES occultation update for (1266) Tone / UCAC2 46544590 event on 2012 Dec 11, 02:12 UT Visible from Russia, Scandanavia, Canada, USA Summary ------- On 2012 Dec 11 UT, the 89 km diameter asteroid (1266) Tone will occult a 12.0 mag star in the constellation Auriga for observers along a path across Russia, Scandanavia, Canada, USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 14.7 mag (the magnitude of the asteroid) for at most 6.0 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: 82 * date and approx. time of event: 2012 Dec 11, 02:06 - 2012 Dec 11, 02:18 UT * geocentric midpoint of event [JD]: 2456272.5918 * magnitude of target star: 12.0 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 6.0 * Moon: 7 % sunlit, 137° distance * Sun: 159° distance * rough path description: Russia, Scandanavia, Canada, USA The occultation path -------------------- * approximate projected width [km]: 101 * 1 sigma uncertainty interval [path widths]: +/- 0.65 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .031", 96° ) * approx speed of asteroid's shadow [km/s]: 14.7849 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 46544590 by 1266 Tone on 2012 Dec 11 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 -132 0 0 16 11 14 2 18 32 1 45 -1 16 49 52 15 32 56 17 40 34 .. .. .. -131 0 0 17 10 3 2 18 32 2 45 -2 17 48 58 16 31 28 18 40 2 15 41 45 -130 0 0 18 9 23 2 18 32 3 46 -4 18 48 34 17 30 31 19 40 1 16 40 28 -129 0 0 19 9 10 2 18 31 5 46 -5 19 48 37 18 30 3 20 40 26 17 39 39 -128 0 0 20 9 22 2 18 30 6 46 -6 20 49 5 19 29 59 21 41 16 18 39 16 -127 0 0 21 9 55 2 18 28 7 47 -7 21 49 54 20 30 17 22 42 26 19 39 15 -126 0 0 22 10 47 2 18 27 9 47 -9 22 51 1 21 30 54 23 43 53 20 39 33 -125 0 0 23 11 53 2 18 25 10 47 -10 23 52 22 22 31 46 24 45 34 21 40 7 -124 0 0 24 13 11 2 18 22 11 48 -11 24 53 54 23 32 50 25 47 25 22 40 54 -123 0 0 25 14 36 2 18 20 13 48 -12 25 55 33 24 34 2 26 49 22 23 41 49 -122 0 0 26 16 6 2 18 17 14 49 -13 26 57 15 25 35 19 27 51 22 24 42 50 -121 0 0 27 17 35 2 18 14 16 49 -15 27 58 58 26 36 36 28 53 21 25 43 53 -120 0 0 28 19 2 2 18 11 17 50 -16 29 0 35 27 37 51 29 55 15 26 44 53 -119 0 0 29 20 21 2 18 8 18 50 -17 30 2 6 28 39 0 30 57 0 27 45 49 -118 0 0 30 21 29 2 18 4 19 51 -18 31 3 24 29 39 58 31 58 32 28 46 35 -117 0 0 31 22 23 2 18 0 21 52 -19 32 4 27 30 40 43 32 59 48 29 47 9 -116 0 0 32 22 59 2 17 56 22 52 -20 33 5 11 31 41 11 34 0 43 30 47 26 -115 0 0 33 23 13 2 17 52 23 53 -21 34 5 33 32 41 17 35 1 15 31 47 24 -114 0 0 34 23 1 2 17 47 25 53 -22 35 5 28 33 41 0 36 1 19 32 46 58 -113 0 0 35 22 21 2 17 43 26 54 -23 36 4 54 34 40 14 37 0 52 33 46 6 -112 0 0 36 21 9 2 17 38 27 55 -24 37 3 46 35 38 58 37 59 51 34 44 44 -111 0 0 37 19 21 2 17 33 28 56 -25 38 2 2 36 37 6 38 58 12 35 42 48 -110 0 0 38 16 55 2 17 28 29 57 -26 38 59 39 37 34 38 39 55 53 36 40 17 -109 0 0 39 13 48 2 17 23 31 57 -27 39 56 33 38 31 29 40 52 49 37 37 7 -108 0 0 40 9 57 2 17 17 32 58 -28 40 52 42 39 27 38 41 48 59 38 33 14 -107 0 0 41 5 19 2 17 12 33 59 -29 41 48 4 40 23 0 42 44 20 39 28 38 -106 0 0 41 59 52 2 17 6 34 60 -30 42 42 35 41 17 35 43 38 49 40 23 14 -105 0 0 42 53 33 2 17 1 35 61 -30 43 36 14 42 11 19 44 32 24 41 17 2 -104 0 0 43 46 21 2 16 55 36 62 -31 44 28 58 43 4 11 45 25 4 42 9 58 -103 0 0 44 38 14 2 16 50 37 63 -32 45 20 47 43 56 8 46 16 46 43 2 2 -102 0 0 45 29 10 2 16 44 38 64 -33 46 11 37 44 47 10 47 7 29 43 53 11 -101 0 0 46 19 8 2 16 38 39 65 -33 47 1 28 45 37 14 47 57 11 44 43 23 -100 0 0 47 8 6 2 16 32 40 66 -34 47 50 19 46 26 20 48 45 51 45 32 38 - 99 0 0 47 56 4 2 16 27 41 67 -35 48 38 8 47 14 26 49 33 29 46 20 55 - 98 0 0 48 43 0 2 16 21 42 68 -35 49 24 54 48 1 31 50 20 3 47 8 11 - 97 0 0 49 28 54 2 16 15 43 70 -36 50 10 38 48 47 35 51 5 33 47 54 28 - 96 0 0 50 13 45 2 16 9 43 71 -36 50 55 18 49 32 37 51 49 58 48 39 43 - 95 0 0 50 57 33 2 16 4 44 72 -37 51 38 54 50 16 36 52 33 18 49 23 58 - 94 0 0 51 40 18 2 15 58 45 73 -37 52 21 27 50 59 34 53 15 34 50 7 10 - 93 0 0 52 22 0 2 15 52 46 74 -38 53 2 55 51 41 28 53 56 45 50 49 21 - 92 0 0 53 2 39 2 15 47 47 76 -38 53 43 20 52 22 21 54 36 52 51 30 30 - 91 0 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35 52 0 0 57 30 34 2 8 2 42 288 -21 58 9 21 56 52 8 59 0 18 56 2 38 53 0 0 56 57 18 2 7 57 41 289 -21 57 36 22 56 18 35 58 27 42 55 28 44 54 0 0 56 23 2 2 7 53 40 290 -20 57 2 23 55 44 3 57 54 5 54 53 52 55 0 0 55 47 47 2 7 49 39 291 -20 56 27 24 55 8 31 57 19 28 54 18 0 56 0 0 55 11 30 2 7 44 39 292 -19 55 51 24 54 31 59 56 43 50 53 41 7 57 0 0 54 34 12 2 7 40 38 293 -18 55 14 21 53 54 25 56 7 8 53 3 14 58 0 0 53 55 51 2 7 35 37 294 -17 54 36 15 53 15 49 55 29 23 52 24 19 59 0 0 53 16 26 2 7 31 36 295 -17 53 57 6 52 36 10 54 50 34 51 44 22 60 0 0 52 35 59 2 7 26 36 296 -16 53 16 53 51 55 28 54 10 40 51 3 22 61 0 0 51 54 27 2 7 22 35 297 -15 52 35 35 51 13 43 53 29 40 50 21 20 62 0 0 51 11 51 2 7 17 34 298 -14 51 53 12 50 30 54 52 47 35 49 38 15 63 0 0 50 28 11 2 7 13 33 299 -14 51 9 44 49 47 2 52 4 24 48 54 8 64 0 0 49 43 26 2 7 8 32 300 -13 50 25 11 49 2 6 51 20 7 48 8 57 65 0 0 48 57 38 2 7 4 31 301 -12 49 39 34 48 16 7 50 34 44 47 22 45 66 0 0 48 10 46 2 6 59 30 302 -11 48 52 52 47 29 5 49 48 16 46 35 30 67 0 0 47 22 51 2 6 55 29 303 -10 48 5 6 46 41 1 49 0 42 45 47 15 68 0 0 46 33 53 2 6 50 28 304 -9 47 16 17 45 51 55 48 12 5 44 57 59 69 0 0 45 43 55 2 6 46 27 305 -8 46 26 26 45 1 49 47 22 23 44 7 44 70 0 0 44 52 56 2 6 42 26 306 -7 45 35 33 44 10 44 46 31 40 43 16 31 71 0 0 44 0 58 2 6 38 25 306 -6 44 43 41 43 18 42 45 39 55 42 24 21 72 0 0 43 8 4 2 6 34 24 307 -5 43 50 51 42 25 43 44 47 11 41 31 17 73 0 0 42 14 14 2 6 30 23 308 -4 42 57 5 41 31 49 43 53 28 40 37 19 74 0 0 41 19 30 2 6 26 22 309 -3 42 2 23 40 37 4 42 58 50 39 42 31 75 0 0 40 23 56 2 6 22 20 309 -2 41 6 50 39 41 28 42 3 19 38 46 53 76 0 0 39 27 33 2 6 19 19 310 -1 40 10 27 38 45 5 41 6 56 37 50 29 Uncertainty in time = +/- 4 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: UCAC2 46544590 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 49 16.7771 DE: +42 57 44.917 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .022, .025 ) * V mag [mag]: 12.0 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1266) Tone approx. diameter [km]: 89 approx. diameter ["]: .047 distance from Earth [AU]: 2.59300 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1019 number of rejected observations: 41 time covered by the observations: 1927 Jan 23 - 2012 Nov 29 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.017, 101° remarks: * orbital elements for (1266) Tone : Mean anomaly = 189.58635011 deg Arg. of pericenter = 294.78757901 deg Long. of node = 320.72618025 deg Inclination = 17.14386585 deg Eccentricity = 0.04840890 Semimajor axis = 3.36735115 AU Perihelion dist = 3.20434139 AU Mag: H = 9.32, G = 0.15 Epoch of elements : MJD 56272.09200000 TDT (2012 Dec 11.092) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 11 1266 Tone 2h 12.2m UT 12.0 5 49 16.777 42 57 44.92UCAC2 46544590 0.0 14.7 89 6.0 2.593 -2.563 -3.12 -25.9313 42.964 145.27 -23.02 2.2032 -0.05155 0.46616 -8.29443 -0.91742 -0.00090 -0.00204 2000 189.252668201212 9.00000294.787579320.726180 17.1438660.04840890 3.3673512 3.2043414 9.4 5.00.15 RATE 1.5950390 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.031 96 1.65 0.031 0 0 1-3 056264.0020121211_544590 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org