IOTA/IOTA-ES occultation update for (521) Brixia / TYC 1306-00268-1 event on 2012 Dec 05, 23:58 UT Visible from Arabia, Africa, Europe, SE Canada, NE USA Summary ------- On 2012 Dec 05 UT, the 122 km diameter asteroid (521) Brixia will occult a 9.0 mag star in the constellation Taurus for observers along a path across Arabia, Africa, Europe, SE Canada, NE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 10.6 mag (the magnitude of the asteroid) for at most 14.6 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: 100 * date and approx. time of event: 2012 Dec 05, 23:46 - 2012 Dec 06, 00:10 UT * geocentric midpoint of event [JD]: 2456267.49875 * magnitude of target star: 9.0 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 14.6 * Moon: 57 % sunlit, 70° distance * Sun: 168° distance * rough path description: Arabia, Africa, Europe, SE Canada, NE USA The occultation path -------------------- * approximate projected width [km]: 126 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .028", .021", 81° ) * approx speed of asteroid's shadow [km/s]: 8.3317 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1306-00268-1 by 521 Brixia on 2012 Dec 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 - 99 0 0 39 30 58 24 10 30 0 64 -11 40 8 52 .. .. .. 40 20 16 .. .. .. - 98 0 0 39 53 32 24 10 30 1 65 -12 40 31 18 39 15 53 40 42 40 39 4 36 - 97 0 0 40 15 34 24 10 30 2 65 -13 40 53 12 39 38 2 41 4 31 39 26 48 - 96 0 0 40 37 3 24 10 29 3 66 -14 41 14 33 39 59 39 41 25 49 39 48 27 - 95 0 0 40 57 59 24 10 29 4 66 -14 41 35 22 40 20 44 41 46 36 40 9 34 - 94 0 0 41 18 24 24 10 28 4 67 -15 41 55 38 40 41 16 42 6 50 40 30 9 - 93 0 0 41 38 16 24 10 27 5 68 -16 42 15 23 41 1 16 42 26 33 40 50 11 - 92 0 0 41 57 37 24 10 26 6 68 -17 42 34 37 41 20 45 42 45 44 41 9 42 - 91 0 0 42 16 27 24 10 24 7 69 -18 42 53 19 41 39 42 43 4 24 41 28 41 - 90 0 0 42 34 46 24 10 23 8 70 -18 43 11 31 41 58 8 43 22 33 41 47 10 - 89 0 0 42 52 34 24 10 21 8 70 -19 43 29 12 42 16 3 43 40 12 42 5 7 - 88 0 0 43 9 52 24 10 20 9 71 -20 43 46 22 42 33 28 43 57 21 42 22 34 - 87 0 0 43 26 39 24 10 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273 -51 21 46 46 20 25 11 21 59 4 20 13 0 42 0 0 20 28 52 23 53 14 62 275 -50 21 9 46 19 48 8 21 22 4 19 35 57 43 0 0 19 51 38 23 53 1 61 276 -49 20 32 32 19 10 52 20 44 50 18 58 40 44 0 0 19 14 11 23 52 48 60 277 -48 19 55 6 18 33 24 20 7 24 18 21 12 45 0 0 18 36 32 23 52 35 59 278 -47 19 17 28 17 55 46 19 29 47 17 43 34 46 0 0 17 58 44 23 52 22 58 279 -46 18 39 40 17 17 57 18 51 58 17 5 45 47 0 0 17 20 47 23 52 9 57 280 -45 18 1 43 16 40 0 18 14 1 16 27 48 48 0 0 16 42 42 23 51 56 56 281 -44 17 23 37 16 1 55 17 35 55 15 49 43 49 0 0 16 4 29 23 51 43 55 282 -43 16 45 24 15 23 44 16 57 42 15 11 32 50 0 0 15 26 11 23 51 31 54 283 -42 16 7 5 14 45 27 16 19 23 14 33 15 51 0 0 14 47 49 23 51 18 53 284 -41 15 28 41 14 7 5 15 40 59 13 54 54 52 0 0 14 9 23 23 51 6 52 285 -40 14 50 14 13 28 40 15 2 31 13 16 29 53 0 0 13 30 54 23 50 54 51 285 -39 14 11 44 12 50 14 14 24 0 12 38 3 54 0 0 12 52 25 23 50 42 50 286 -38 13 33 12 12 11 46 13 45 28 11 59 36 55 0 0 12 13 55 23 50 30 49 287 -37 12 54 40 11 33 18 13 6 55 11 21 9 56 0 0 11 35 26 23 50 18 48 287 -36 12 16 9 10 54 52 12 28 24 10 42 44 57 0 0 10 57 0 23 50 7 47 288 -35 11 37 40 10 16 29 11 49 54 10 4 21 58 0 0 10 18 37 23 49 55 46 288 -34 10 59 14 9 38 9 11 11 27 9 26 2 59 0 0 9 40 19 23 49 44 45 289 -33 10 20 53 8 59 54 10 33 5 8 47 48 60 0 0 9 2 7 23 49 33 44 289 -31 9 42 37 8 21 45 9 54 48 8 9 40 61 0 0 8 24 1 23 49 22 43 290 -30 9 4 28 7 43 43 9 16 37 7 31 39 62 0 0 7 46 4 23 49 12 41 290 -29 8 26 26 7 5 49 8 38 35 6 53 47 63 0 0 7 8 16 23 49 2 40 290 -28 7 48 34 6 28 5 8 0 41 6 16 4 64 0 0 6 30 38 23 48 52 39 291 -27 7 10 52 5 50 32 7 22 57 5 38 32 65 0 0 5 53 11 23 48 42 38 291 -26 6 33 21 5 13 10 6 45 25 5 1 11 66 0 0 5 15 57 23 48 32 37 291 -25 5 56 2 4 36 1 6 8 5 4 24 3 67 0 0 4 38 57 23 48 23 36 291 -24 5 18 57 3 59 5 5 30 58 3 47 9 68 0 0 4 2 11 23 48 14 35 292 -22 4 42 6 3 22 25 4 54 6 3 10 30 69 0 0 3 25 41 23 48 5 34 292 -21 4 5 30 2 46 0 4 17 29 2 34 7 70 0 0 2 49 28 23 47 56 33 292 -20 3 29 12 2 9 52 3 41 8 1 58 1 71 0 0 2 13 33 23 47 48 31 292 -19 2 53 10 1 34 2 3 5 5 1 22 13 72 0 0 1 37 56 23 47 40 30 292 -18 2 17 28 0 58 31 2 29 21 0 46 43 73 0 0 1 2 38 23 47 32 29 292 -17 1 42 5 0 23 20 1 53 56 0 11 34 74 0 0 0 27 42 23 47 25 28 293 -16 1 7 2 - 0 11 31 1 18 51 - 0 23 15 75 0 0 - 0 6 54 23 47 18 27 293 -15 0 32 20 - 0 46 0 0 44 8 - 0 57 42 76 0 0 - 0 41 7 23 47 11 26 293 -14 - 0 1 59 - 1 20 7 0 9 46 - 1 31 47 77 0 0 - 1 14 57 23 47 4 25 293 -12 - 0 35 56 - 1 53 50 - 0 24 12 - 2 5 29 78 0 0 - 1 48 23 23 46 58 24 293 -11 - 1 9 28 - 2 27 10 - 0 57 47 - 2 38 47 79 0 0 - 2 21 24 23 46 52 23 293 -10 - 1 42 36 - 3 0 5 - 1 30 57 - 3 11 39 80 0 0 - 2 54 0 23 46 46 21 293 -9 - 2 15 19 - 3 32 34 - 2 3 41 - 3 44 7 81 0 0 - 3 26 10 23 46 40 20 293 -8 - 2 47 36 - 4 4 37 - 2 36 0 - 4 16 8 82 0 0 - 3 57 53 23 46 35 19 293 -7 - 3 19 26 - 4 36 13 - 3 7 52 - 4 47 42 83 0 0 - 4 29 8 23 46 30 18 293 -6 - 3 50 48 - 5 7 22 - 3 39 17 - 5 18 49 84 0 0 - 4 59 56 23 46 26 17 293 -5 - 4 21 43 - 5 38 2 - 4 10 13 - 5 49 27 85 0 0 - 5 30 15 23 46 21 16 293 -4 - 4 52 8 - 6 8 14 - 4 40 41 - 6 19 37 86 0 0 - 6 0 4 23 46 17 15 293 -2 - 5 22 5 - 6 37 57 - 5 10 40 - 6 49 17 87 0 0 - 6 29 24 23 46 14 14 292 -1 - 5 51 32 - 7 7 10 - 5 40 9 - 7 18 28 88 0 0 - 6 58 14 23 46 10 13 292 0 - 6 20 29 - 7 35 52 - 6 9 8 - 7 47 9 Uncertainty in time = +/- 3 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 1306-00268-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 42 52.8098 DE: +20 02 03.021 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .015, .016 ) * V mag [mag]: 9.0 * B mag [mag]: 9.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (521) Brixia approx. diameter [km]: 122 approx. diameter ["]: .158 distance from Earth [AU]: 1.06800 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 971 number of rejected observations: 74 time covered by the observations: 1904 Jan 10 - 2012 Nov 28 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.013, 78° remarks: * orbital elements for (521) Brixia : Mean anomaly = 18.82385384 deg Arg. of pericenter = 316.20871033 deg Long. of node = 89.66441225 deg Inclination = 10.59841977 deg Eccentricity = 0.28336043 Semimajor axis = 2.74005005 AU Perihelion dist = 1.96362830 AU Mag: H = 8.15, G = -0.06 Epoch of elements : MJD 56266.99900000 TDT (2012 Dec 05.999) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 5 521 Brixia 23h 58.2m UT 9.0 5 42 52.810 20 2 3.02TYC 1306-00268-1 9.6 10.6 122 14.6 1.068 -2.437 17.88 10.9871 20.030 178.20 -22.51 23.9700 0.11702 0.22716 -4.17128 2.17153 -0.00117 0.00028 2000 17.30294820121129.00000316.208710 89.664412 10.5984200.28336043 2.7400501 1.9636283 8.3 5.0-.06 RATE 2.1730330 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.028 0.021 81 1.15 0.023 0 0-2 1 056264.0020121205_0268-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 22:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org