IOTA/IOTA-ES occultation update for (521) Brixia / TYC 1310-02663-1 event on 2012 Dec 12, 12:13 UT Visible from Russia Summary ------- On 2012 Dec 12 UT, the 122 km diameter asteroid (521) Brixia will occult a 11.9 mag star in the constellation Taurus for observers along a path across Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.2 mag to 10.3 mag (the magnitude of the asteroid) for at most 13.9 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: 99 * date and approx. time of event: 2012 Dec 12, 12:02 - 2012 Dec 12, 12:25 UT * geocentric midpoint of event [JD]: 2456274.00959167 * magnitude of target star: 11.9 * magnitude drop [mag]: 0.2 * estimated maximum duration [s]: 13.9 * Moon: 1 % sunlit, 164° distance * Sun: 175° distance * rough path description: Russia The occultation path -------------------- * approximate projected width [km]: 129 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .030", 84° ) * approx speed of asteroid's shadow [km/s]: 8.7679 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1310-02663-1 by 521 Brixia on 2012 Dec 12 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 67 0 0 42 0 48 12 25 16 0 62 -5 42 40 14 41 21 32 42 56 3 .. .. .. 68 0 0 42 24 35 12 25 16 1 63 -6 43 3 52 41 45 28 43 19 38 41 29 51 69 0 0 42 47 50 12 25 15 2 63 -6 43 26 58 42 8 51 43 42 41 41 53 18 70 0 0 43 10 32 12 25 15 3 64 -7 43 49 32 42 31 42 44 5 11 42 16 12 71 0 0 43 32 42 12 25 14 4 65 -8 44 11 33 42 54 0 44 27 9 42 38 34 72 0 0 43 54 19 12 25 14 4 65 -9 44 33 3 43 15 46 44 48 35 43 0 23 73 0 0 44 15 25 12 25 13 5 66 -10 44 54 0 43 37 0 45 9 29 43 21 40 74 0 0 44 36 0 12 25 12 6 67 -10 45 14 26 43 57 43 45 29 52 43 42 26 75 0 0 44 56 3 12 25 10 7 67 -11 45 34 21 44 17 54 45 49 43 44 2 41 76 0 0 45 15 35 12 25 9 8 68 -12 45 53 45 44 37 34 46 9 4 44 22 24 77 0 0 45 34 37 12 25 8 8 69 -13 46 12 39 44 56 44 46 27 54 44 41 37 78 0 0 45 53 8 12 25 6 9 70 -14 46 31 2 45 15 22 46 46 14 45 0 19 79 0 0 46 11 9 12 25 4 10 70 -14 46 48 55 45 33 31 47 4 5 45 18 31 80 0 0 46 28 40 12 25 2 11 71 -15 47 6 19 45 51 10 47 21 25 45 36 12 81 0 0 46 45 42 12 25 1 11 72 -16 47 23 13 46 8 19 47 38 16 45 53 25 82 0 0 47 2 15 12 24 59 12 72 -16 47 39 39 46 24 59 47 54 39 46 10 7 83 0 0 47 18 18 12 24 56 13 73 -17 47 55 35 46 41 10 48 10 32 46 26 21 84 0 0 47 33 54 12 24 54 14 74 -18 48 11 3 46 56 52 48 25 58 46 42 6 85 0 0 47 49 1 12 24 52 14 75 -19 48 26 3 47 12 6 48 40 55 46 57 23 86 0 0 48 3 40 12 24 50 15 75 -19 48 40 36 47 26 52 48 55 24 47 12 11 87 0 0 48 17 51 12 24 47 16 76 -20 48 54 40 47 41 10 49 9 27 47 26 32 88 0 0 48 31 35 12 24 44 16 77 -21 49 8 18 47 55 1 49 23 1 47 40 25 89 0 0 48 44 52 12 24 42 17 78 -21 49 21 29 48 8 24 49 36 10 47 53 51 90 0 0 48 57 42 12 24 39 18 78 -22 49 34 13 48 21 20 49 48 51 48 6 50 91 0 0 49 10 6 12 24 36 18 79 -23 49 46 30 48 33 50 50 1 7 48 19 22 92 0 0 49 22 4 12 24 33 19 80 -23 49 58 22 48 45 53 50 12 56 48 31 27 93 0 0 49 33 35 12 24 30 20 81 -24 50 9 48 48 57 30 50 24 20 48 43 7 94 0 0 49 44 41 12 24 27 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49 -125 0 0 10 52 41 12 5 3 38 288 -34 11 33 54 10 11 39 11 50 26 9 55 17 -124 0 0 10 15 13 12 4 54 37 288 -33 10 56 21 9 34 16 11 12 51 9 17 56 -123 0 0 9 37 57 12 4 45 36 289 -32 10 18 59 8 57 6 10 35 28 8 40 48 -122 0 0 9 0 54 12 4 37 34 289 -30 9 41 51 8 20 8 9 58 17 8 3 53 -121 0 0 8 24 5 12 4 28 33 289 -29 9 4 56 7 43 25 9 21 20 7 27 12 -120 0 0 7 47 31 12 4 20 32 290 -28 8 28 17 7 6 57 8 44 38 6 50 46 -119 0 0 7 11 14 12 4 12 31 290 -27 7 51 53 6 30 45 8 8 12 6 14 37 -118 0 0 6 35 13 12 4 4 30 290 -26 7 15 46 5 54 51 7 32 2 5 38 45 -117 0 0 5 59 31 12 3 57 29 291 -25 6 39 57 5 19 15 6 56 11 5 3 12 -116 0 0 5 24 8 12 3 50 28 291 -24 6 4 28 4 43 59 6 20 39 4 27 58 -115 0 0 4 49 5 12 3 43 27 291 -23 5 29 18 4 9 2 5 45 27 3 53 4 -114 0 0 4 14 23 12 3 36 26 291 -21 4 54 30 3 34 27 5 10 35 3 18 31 -113 0 0 3 40 3 12 3 30 24 291 -20 4 20 3 3 0 14 4 36 5 2 44 21 -112 0 0 3 6 6 12 3 24 23 291 -19 3 45 59 2 26 24 4 1 59 2 10 33 -111 0 0 2 32 33 12 3 18 22 291 -18 3 12 18 1 52 57 3 28 15 1 37 9 -110 0 0 1 59 23 12 3 12 21 292 -17 2 39 2 1 19 55 2 54 56 1 4 10 -109 0 0 1 26 40 12 3 7 20 292 -16 2 6 11 0 47 18 2 22 2 0 31 36 -108 0 0 0 54 22 12 3 2 19 292 -15 1 33 46 0 15 8 1 49 34 - 0 0 31 -107 0 0 0 22 31 12 2 57 18 292 -14 1 1 47 - 0 16 36 1 17 33 - 0 32 12 -106 0 0 - 0 8 53 12 2 53 17 292 -13 0 30 16 - 0 47 53 0 45 59 - 1 3 26 -105 0 0 - 0 39 49 12 2 49 16 292 -11 - 0 0 47 - 1 18 41 0 14 53 - 1 34 11 -104 0 0 - 1 10 16 12 2 45 14 292 -10 - 0 31 21 - 1 49 1 - 0 15 45 - 2 4 28 -103 0 0 - 1 40 13 12 2 41 13 292 -9 - 1 1 26 - 2 18 51 - 0 45 53 - 2 34 16 -102 0 0 - 2 9 41 12 2 38 12 292 -8 - 1 31 2 - 2 48 12 - 1 15 31 - 3 3 33 -101 0 0 - 2 38 39 12 2 35 11 292 -7 - 2 0 7 - 3 17 2 - 1 44 39 - 3 32 20 -100 0 0 - 3 7 5 12 2 32 10 292 -6 - 2 28 41 - 3 45 21 - 2 13 16 - 4 0 37 - 99 0 0 - 3 35 1 12 2 30 9 292 -5 - 2 56 43 - 4 13 9 - 2 41 22 - 4 28 22 - 98 0 0 - 4 2 24 12 2 28 8 292 -4 - 3 24 14 - 4 40 25 - 3 8 55 - 4 55 35 - 97 0 0 - 4 29 15 12 2 26 7 292 -3 - 3 51 12 - 5 7 9 - 3 35 57 - 5 22 16 - 96 0 0 - 4 55 34 12 2 24 6 292 -2 - 4 17 38 - 5 33 20 - 4 2 25 - 5 48 25 - 95 0 0 - 5 21 19 12 2 23 5 291 -1 - 4 43 31 - 5 58 59 - 4 28 21 - 6 14 0 Uncertainty in time = +/- 3 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 1310-02663-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 36 17.0317 DE: +20 49 00.729 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .028 ) * V mag [mag]: 11.9 * B mag [mag]: 12.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (521) Brixia approx. diameter [km]: 122 approx. diameter ["]: .157 distance from Earth [AU]: 1.07000 * 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 = 20.24020313 deg Arg. of pericenter = 316.20604225 deg Long. of node = 89.66436787 deg Inclination = 10.59847541 deg Eccentricity = 0.28335796 Semimajor axis = 2.74002408 AU Perihelion dist = 1.96361646 AU Mag: H = 8.15, G = -0.06 Epoch of elements : MJD 56273.50900000 TDT (2012 Dec 12.509) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 12 521 Brixia 12h 13.8m UT 11.9 5 36 17.032 20 49 0.73TYC 1310-02663-1 12.3 10.3 122 13.9 1.070 -2.597 18.10 179.0185 20.813 -4.97 -23.12 12.2302 0.14385 0.28940 -4.43137 2.20320 -0.00038 0.00023 2000 19.477675201212 9.00000316.206042 89.664368 10.5984750.28335796 2.7400241 1.9636164 8.3 5.0-.06 RATE 2.1730640 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.030 84 1.20 0.031 0 0-3-1 056264.0020121212_2663-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org