IOTA/IOTA-ES occultation update for (515) Athalia / TYC 1386-01139-1 event on 2010 Jan 05, 21:55 UT Visible from China, Russia, Europe Summary ------- On 2010 Jan 05 UT, the 38 km diameter asteroid (515) Athalia will occult a 11.3 mag star in the constellation Cancer for observers along a path across China, Russia, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.0 mag to 15.2 mag (the magnitude of the asteroid) for at most 3.6 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: 56 * date and approx. time of event: 2010 Jan 05, 21:47 - 2010 Jan 05, 22:04 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 4.0 * estimated maximum duration [s]: 3.6 * Moon: 67 % sunlit, 54° distance * Sun: 163° distance * rough path description: China, Russia, Europe The occultation path -------------------- * approximate projected width [km]: 43 * 1 sigma uncertainty interval [path widths]: +/- 1.11 * 1 sigma uncertainty interval [seconds]: +/- 5.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .048 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .049", .032", 98° ) * approx speed of asteroid's shadow [km/s]: 10.6040 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1386-01139-1 by 515 Athalia on 2010 Jan 5 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 - 60 0 0 42 2 48 22 4 33 0 64 -15 42 15 47 .. .. .. 42 44 43 .. .. .. - 59 0 0 42 24 50 22 4 33 1 64 -15 42 37 48 42 11 54 43 6 40 41 43 18 - 58 0 0 42 46 31 22 4 32 2 65 -16 42 59 27 42 33 37 43 28 16 42 5 4 - 57 0 0 43 7 50 22 4 32 3 66 -17 43 20 44 42 54 57 43 49 30 42 26 28 - 56 0 0 43 28 47 22 4 32 3 66 -18 43 41 40 43 15 56 44 10 22 42 47 31 - 55 0 0 43 49 23 22 4 31 4 67 -19 44 2 14 43 36 34 44 30 52 43 8 12 - 54 0 0 44 9 37 22 4 30 5 68 -19 44 22 27 43 56 49 44 51 1 43 28 31 - 53 0 0 44 29 29 22 4 29 6 68 -20 44 42 17 44 16 43 45 10 47 43 48 28 - 52 0 0 44 48 59 22 4 28 6 69 -21 45 1 45 44 36 15 45 30 12 44 8 3 - 51 0 0 45 8 7 22 4 27 7 70 -22 45 20 52 44 55 24 45 49 15 44 27 17 - 50 0 0 45 26 53 22 4 26 8 71 -22 45 39 36 45 14 12 46 7 55 44 46 8 - 49 0 0 45 45 17 22 4 25 9 71 -23 45 57 58 45 32 38 46 26 14 45 4 38 - 48 0 0 46 3 19 22 4 23 10 72 -24 46 15 59 45 50 42 46 44 10 45 22 45 - 47 0 0 46 20 59 22 4 22 10 73 -25 46 33 37 46 8 23 47 1 45 45 40 31 - 46 0 0 46 38 18 22 4 20 11 74 -25 46 50 53 46 25 43 47 18 57 45 57 55 - 45 0 0 46 55 14 22 4 18 12 74 -26 47 7 48 46 42 41 47 35 48 46 14 56 - 44 0 0 47 11 48 22 4 16 12 75 -27 47 24 21 46 59 17 47 52 17 46 31 36 - 43 0 0 47 28 1 22 4 14 13 76 -27 47 40 32 47 15 32 48 8 24 46 47 54 - 42 0 0 47 43 52 22 4 12 14 76 -28 47 56 21 47 31 24 48 24 9 47 3 51 - 41 0 0 47 59 21 22 4 10 15 77 -29 48 11 48 47 46 55 48 39 33 47 19 25 - 40 0 0 48 14 29 22 4 8 15 78 -29 48 26 54 48 2 5 48 54 35 47 34 38 - 39 0 0 48 29 15 22 4 6 16 79 -30 48 41 39 48 16 53 49 9 16 47 49 30 - 38 0 0 48 43 40 22 4 3 17 80 -31 48 56 2 48 31 19 49 23 36 48 4 0 - 37 0 0 48 57 43 22 4 1 17 80 -31 49 10 4 48 45 24 49 37 34 48 18 9 - 36 0 0 49 11 26 22 3 58 18 81 -32 49 23 45 48 59 8 49 51 11 48 31 56 - 35 0 0 49 24 47 22 3 56 19 82 -33 49 37 5 49 12 31 50 4 27 48 45 23 - 34 0 0 49 37 48 22 3 53 19 83 -33 49 50 3 49 25 33 50 17 22 48 58 28 - 33 0 0 49 50 27 22 3 50 20 83 -34 50 2 41 49 38 14 50 29 57 49 11 13 - 32 0 0 50 2 46 22 3 48 21 84 -35 50 14 59 49 50 35 50 42 11 49 23 36 - 31 0 0 50 14 44 22 3 45 21 85 -35 50 26 55 50 2 34 50 54 4 49 35 39 - 30 0 0 50 26 22 22 3 42 22 86 -36 50 38 32 50 14 14 51 5 37 49 47 22 - 29 0 0 50 37 39 22 3 39 23 87 -36 50 49 48 50 25 32 51 16 50 49 58 44 - 28 0 0 50 48 36 22 3 36 23 88 -37 51 0 43 50 36 31 51 27 42 50 9 45 - 27 0 0 50 59 13 22 3 33 24 88 -38 51 11 19 50 47 9 51 38 15 50 20 27 - 26 0 0 51 9 31 22 3 29 25 89 -38 51 21 35 50 57 28 51 48 27 50 30 48 - 25 0 0 51 19 28 22 3 26 25 90 -39 51 31 31 51 7 26 51 58 20 50 40 50 - 24 0 0 51 29 5 22 3 23 26 91 -39 51 41 7 51 17 5 52 7 54 50 50 31 - 23 0 0 51 38 23 22 3 20 26 92 -40 51 50 23 51 26 24 52 17 7 50 59 53 - 22 0 0 51 47 22 22 3 16 27 93 -40 51 59 21 51 35 24 52 26 2 51 8 56 - 21 0 0 51 56 1 22 3 13 28 93 -41 52 7 58 51 44 4 52 34 37 51 17 39 - 20 0 0 52 4 20 22 3 9 28 94 -41 52 16 17 51 52 25 52 42 53 51 26 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33 81 0 0 40 1 26 21 53 10 57 240 -46 40 14 30 39 48 23 40 43 38 39 19 32 82 0 0 39 38 11 21 53 1 57 242 -45 39 51 16 39 25 7 40 20 26 38 56 14 83 0 0 39 14 38 21 52 53 56 244 -45 39 27 44 39 1 34 39 56 57 38 32 38 84 0 0 38 50 49 21 52 45 56 245 -44 39 3 56 38 37 43 39 33 10 38 8 46 85 0 0 38 26 43 21 52 36 55 247 -43 38 39 51 38 13 36 39 9 7 37 44 37 86 0 0 38 2 20 21 52 28 55 248 -43 38 15 29 37 49 13 38 44 47 37 20 12 87 0 0 37 37 42 21 52 19 54 250 -42 37 50 52 37 24 34 38 20 12 36 55 32 88 0 0 37 12 48 21 52 11 53 251 -41 37 25 59 36 59 40 37 55 20 36 30 36 89 0 0 36 47 40 21 52 2 53 253 -40 37 0 51 36 34 30 37 30 14 36 5 25 90 0 0 36 22 16 21 51 54 52 254 -40 36 35 28 36 9 6 37 4 52 35 40 0 91 0 0 35 56 39 21 51 46 52 255 -39 36 9 51 35 43 28 36 39 16 35 14 20 92 0 0 35 30 47 21 51 37 51 257 -38 35 44 0 35 17 37 36 13 27 34 48 27 93 0 0 35 4 43 21 51 29 50 258 -37 35 17 56 34 51 32 35 47 24 34 22 22 94 0 0 34 38 26 21 51 21 50 259 -36 34 51 39 34 25 14 35 21 8 33 56 3 95 0 0 34 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21 49 24 37 274 -23 27 58 29 27 32 8 28 27 53 27 3 1 110 0 0 27 16 59 21 49 17 37 275 -22 27 30 10 27 3 50 27 59 33 26 34 44 111 0 0 26 48 39 21 49 10 36 275 -21 27 1 49 26 35 30 27 31 11 26 6 26 112 0 0 26 20 18 21 49 3 35 276 -20 26 33 28 26 7 10 27 2 47 25 38 7 113 0 0 25 51 57 21 48 56 34 277 -19 26 5 5 25 38 49 26 34 23 25 9 48 114 0 0 25 23 36 21 48 50 33 278 -18 25 36 44 25 10 29 26 6 0 24 41 30 115 0 0 24 55 16 21 48 43 32 278 -17 25 8 23 24 42 11 25 37 38 24 13 13 116 0 0 24 26 59 21 48 37 31 279 -16 24 40 5 24 13 54 25 9 17 23 44 59 117 0 0 23 58 44 21 48 31 30 279 -15 24 11 49 23 45 40 24 40 59 23 16 47 118 0 0 23 30 33 21 48 25 29 280 -14 23 43 37 23 17 30 24 12 45 22 48 39 119 0 0 23 2 26 21 48 19 28 280 -13 23 15 29 22 49 25 23 44 35 22 20 36 120 0 0 22 34 24 21 48 14 27 281 -12 22 47 27 22 21 24 23 16 29 21 52 38 121 0 0 22 6 29 21 48 8 26 281 -11 22 19 30 21 53 29 22 48 30 21 24 45 122 0 0 21 38 39 21 48 3 25 282 -10 21 51 39 21 25 41 22 20 37 20 57 0 123 0 0 21 10 58 21 47 58 24 282 -9 21 23 56 20 58 1 21 52 51 20 29 22 124 0 0 20 43 24 21 47 53 23 283 -8 20 56 21 20 30 28 21 25 13 20 1 52 125 0 0 20 15 59 21 47 48 22 283 -7 20 28 55 20 3 5 20 57 44 19 34 32 126 0 0 19 48 44 21 47 43 21 284 -6 20 1 39 19 35 51 20 30 25 19 7 21 127 0 0 19 21 40 21 47 39 20 284 -5 19 34 33 19 8 48 20 3 16 18 40 21 128 0 0 18 54 46 21 47 35 19 285 -4 19 7 38 18 41 56 19 36 18 18 13 31 129 0 0 18 28 4 21 47 31 18 285 -3 18 40 55 18 15 15 19 9 31 17 46 54 130 0 0 18 1 35 21 47 27 17 285 -2 18 14 24 17 48 47 18 42 58 17 20 29 131 0 0 17 35 19 21 47 24 16 286 -1 17 48 6 17 22 33 18 16 37 16 54 18 Uncertainty in time = +/- 6 secs Prediction of 2009 Dec 27.0 Data for the target star ------------------------ * name: TYC 1386-01139-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 18 22.1147 DE: +19 22 26.249 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .021 ) * V mag [mag]: 11.3 * B mag [mag]: 11.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (515) Athalia approx. diameter [km]: 38 approx. diameter ["]: .029 distance from Earth [AU]: 1.81800 * orbital information: orbit source: Preston date of fit: 2009 Oct 19 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 911 number of rejected observations: 43 time covered by the observations: 1903 Sep 20 - 2009 Sep 27 1 sigma uncertainty ellipse (major, minor, PA): 0.041, 0.024, 101° remarks: * orbital elements for (515) Athalia : Mean anomaly = 40.93890725 deg Arg. of pericenter = 299.30995151 deg Long. of node = 121.22394525 deg Inclination = 2.03780766 deg Eccentricity = 0.16932688 Semimajor axis = 3.12619556 AU Perihelion dist = 2.59684662 AU Mag: H = 10.71, G = 0.15 Epoch of elements : MJD 55201.91400000 TDT (2010 Jan 05.914) ------ occelmnt file for Occult BEGIN ----------------------------------- 2010 Jan 5 515 Athalia 21h 55.8m UT 11.3 8 18 22.115 19 22 26.25TYC 1386-01139-1 11.8 15.2 38 3.6 1.818 -1.963 8.22 50.2666 19.372 -147.55 -22.54 21.9294 0.13360 0.45714 -5.73930 1.69802 -0.00172 0.00043 2000 40.5976182010 1 4.00000299.309952121.223945 2.0378080.16932688 3.1261956 2.596846611.2 5.00.15 RATE 1.7831170 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.049 0.032 98 2.11 0.032 0 055192.0020100105_1139-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Oct 19, 17:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org