IOTA/IOTA-ES occultation update for (521) Brixia / HIP 26381 event on 2012 Dec 11, 18:44 UT Visible from Philippines, China, Russia, Europe Summary ------- On 2012 Dec 11 UT, the 122 km diameter asteroid (521) Brixia will occult a 7.8 mag star in the constellation Taurus for observers along a path across Philippines, China, Russia, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.7 mag to 10.4 mag (the magnitude of the asteroid) for at most 14.0 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: . The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2012 Dec 11, 18:32 - 2012 Dec 11, 18:56 UT * geocentric midpoint of event [JD]: 2456273.28100833 * magnitude of target star: 7.8 * magnitude drop [mag]: 2.7 * estimated maximum duration [s]: 14.0 * Moon: 4 % sunlit, 153° distance * Sun: 175° distance * rough path description: Philippines, China, Russia, Europe The occultation path -------------------- * approximate projected width [km]: 124 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .019) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .019", 84° ) * approx speed of asteroid's shadow [km/s]: 8.7440 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 26381 by 521 Brixia 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 - 24 0 0 33 24 39 18 56 38 1 65 -6 34 1 21 32 48 0 34 12 23 32 37 2 - 23 0 0 33 47 27 18 56 38 2 66 -7 34 24 2 33 10 56 34 35 1 32 59 59 - 22 0 0 34 9 43 18 56 38 3 67 -8 34 46 10 33 33 19 34 57 7 33 22 24 - 21 0 0 34 31 26 18 56 37 3 67 -9 35 7 46 33 55 9 35 18 41 33 44 16 - 20 0 0 34 52 36 18 56 36 4 68 -10 35 28 50 34 16 26 35 39 42 34 5 36 - 19 0 0 35 13 14 18 56 35 5 68 -10 35 49 21 34 37 12 36 0 12 34 26 23 - 18 0 0 35 33 21 18 56 34 6 69 -11 36 9 20 34 57 25 36 20 9 34 46 39 - 17 0 0 35 52 55 18 56 33 7 69 -12 36 28 48 35 17 6 36 39 35 35 6 22 - 16 0 0 36 11 59 18 56 32 8 70 -13 36 47 45 35 36 16 36 58 29 35 25 34 - 15 0 0 36 30 30 18 56 30 9 71 -14 37 6 10 35 54 54 37 16 52 35 44 14 - 14 0 0 36 48 31 18 56 28 10 71 -15 37 24 4 36 13 1 37 34 45 36 2 23 - 13 0 0 37 6 1 18 56 26 10 72 -16 37 41 28 36 30 37 37 52 6 36 20 1 - 12 0 0 37 23 0 18 56 24 11 72 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10 4 30 42 2 48 23 132 0 0 3 2 3 18 35 38 41 295 -35 3 41 24 2 22 48 3 53 13 2 11 2 133 0 0 2 24 46 18 35 28 40 295 -34 3 4 4 1 45 33 3 15 52 1 33 48 134 0 0 1 47 38 18 35 19 38 295 -33 2 26 52 1 8 28 2 38 39 0 56 43 135 0 0 1 10 39 18 35 10 37 295 -32 1 49 50 0 31 32 2 1 36 0 19 49 136 0 0 0 33 52 18 35 1 36 296 -31 1 12 59 - 0 5 11 1 24 44 - 0 16 54 137 0 0 - 0 2 43 18 34 53 35 296 -30 0 36 20 - 0 41 43 0 48 4 - 0 53 24 138 0 0 - 0 39 6 18 34 44 34 296 -29 - 0 0 6 - 1 18 1 0 11 37 - 1 29 41 139 0 0 - 1 15 14 18 34 36 33 296 -28 - 0 36 18 - 1 54 5 - 0 24 36 - 2 5 44 140 0 0 - 1 51 6 18 34 28 32 296 -26 - 1 12 15 - 2 29 53 - 1 0 35 - 2 41 31 141 0 0 - 2 26 43 18 34 21 30 296 -25 - 1 47 56 - 3 5 26 - 1 36 17 - 3 17 2 142 0 0 - 3 2 2 18 34 14 29 296 -24 - 2 23 20 - 3 40 40 - 2 11 43 - 3 52 15 143 0 0 - 3 37 4 18 34 7 28 296 -23 - 2 58 27 - 4 15 37 - 2 46 51 - 4 27 10 144 0 0 - 4 11 46 18 34 0 27 296 -22 - 3 33 14 - 4 50 14 - 3 21 40 - 5 1 46 145 0 0 - 4 46 9 18 33 53 26 296 -21 - 4 7 42 - 5 24 32 - 3 56 9 - 5 36 2 146 0 0 - 5 20 11 18 33 47 25 296 -20 - 4 41 50 - 5 58 29 - 4 30 18 - 6 9 57 147 0 0 - 5 53 52 18 33 41 24 296 -19 - 5 15 36 - 6 32 4 - 5 4 6 - 6 43 31 148 0 0 - 6 27 10 18 33 36 23 296 -17 - 5 48 59 - 7 5 16 - 5 37 31 - 7 16 41 149 0 0 - 7 0 5 18 33 30 22 296 -16 - 6 22 0 - 7 38 6 - 6 10 34 - 7 49 29 150 0 0 - 7 32 36 18 33 25 20 295 -15 - 6 54 37 - 8 10 31 - 6 43 13 - 8 21 53 151 0 0 - 8 4 43 18 33 20 19 295 -14 - 7 26 50 - 8 42 32 - 7 15 27 - 8 53 52 152 0 0 - 8 36 24 18 33 16 18 295 -13 - 7 58 38 - 9 14 7 - 7 47 17 - 9 25 25 153 0 0 - 9 7 40 18 33 11 17 295 -12 - 8 29 59 - 9 45 17 - 8 18 41 - 9 56 33 154 0 0 - 9 38 29 18 33 7 16 295 -11 - 9 0 55 -10 16 0 - 8 49 38 -10 27 14 155 0 0 -10 8 51 18 33 4 15 295 -10 - 9 31 23 -10 46 16 - 9 20 8 -10 57 28 156 0 0 -10 38 46 18 33 0 14 295 -9 -10 1 24 -11 16 4 - 9 50 11 -11 27 15 157 0 0 -11 8 12 18 32 57 13 294 -8 -10 30 57 -11 45 24 -10 19 46 -11 56 33 158 0 0 -11 37 10 18 32 54 12 294 -6 -11 0 1 -12 14 15 -10 48 52 -12 25 22 159 0 0 -12 5 38 18 32 51 11 294 -5 -11 28 36 -12 42 37 -11 17 29 -12 53 42 160 0 0 -12 33 37 18 32 49 10 294 -4 -11 56 42 -13 10 30 -11 45 36 -13 21 33 161 0 0 -13 1 6 18 32 47 8 294 -3 -12 24 17 -13 37 52 -12 13 14 -13 48 53 162 0 0 -13 28 5 18 32 45 7 293 -2 -12 51 22 -14 4 44 -12 40 21 -14 15 43 163 0 0 -13 54 33 18 32 43 6 293 -1 -13 17 57 -14 31 6 -13 6 57 -14 42 3 164 0 0 -14 20 30 18 32 42 5 293 0 -13 44 0 -14 56 56 -13 33 3 -15 7 51 Uncertainty in time = +/- 3 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: HIP 26381 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 37 02.4124 DE: +20 43 45.402 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .023, .014 ) * V mag [mag]: 7.8 * B mag [mag]: 8.3 * 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 = 20.08180843 deg Arg. of pericenter = 316.20634736 deg Long. of node = 89.66437213 deg Inclination = 10.59846926 deg Eccentricity = 0.28335826 Semimajor axis = 2.74002718 AU Perihelion dist = 1.96361784 AU Mag: H = 8.15, G = -0.06 Epoch of elements : MJD 56272.78100000 TDT (2012 Dec 11.781) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 11 521 Brixia 18h 44.7m UT 7.8 5 37 2.412 20 43 45.40HIP 26381 8.4 10.4 122 14.0 1.070 -2.589 18.10 82.2150 20.725 -102.76 -23.07 18.7442 0.06981 0.14067 -4.41695 2.20194 -0.00048 0.00023 2000 19.477480201212 9.00000316.206347 89.664372 10.5984690.28335826 2.7400272 1.9636178 8.3 5.0-.06 RATE 2.1730600 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.019 84 1.15 0.024 0 0 4 2 056264.0020121211__26381 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org