IOTA/IOTA-ES occultation update for (521) Brixia / TYC 0712-00441-1 event on 2012 Sep 20, 17:57 UT Visible from Japan, China Summary ------- On 2012 Sep 20 UT, the 122 km diameter asteroid (521) Brixia will occult a 11.9 mag star in the constellation Orion for observers along a path across Japan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.1 mag to 12.5 mag (the magnitude of the asteroid) for at most 7.6 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: 99 * date and approx. time of event: 2012 Sep 20, 17:51 - 2012 Sep 20, 17:58 UT * geocentric midpoint of event [JD]: 2456191.24812083 * magnitude of target star: 11.9 * magnitude drop [mag]: 1.1 * estimated maximum duration [s]: 7.6 * Moon: 27 % sunlit, 158° distance * Sun: 97° distance * rough path description: Japan, China The occultation path -------------------- * approximate projected width [km]: 148 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .027", 81° ) * approx speed of asteroid's shadow [km/s]: 16.1475 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0712-00441-1 by 521 Brixia on 2012 Sep 20 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 76 0 0 26 49 40 17 51 54 0 74 -59 26 7 48 27 31 53 .. .. .. 27 53 8 77 0 0 27 5 52 17 51 54 1 74 -59 26 23 58 27 48 8 26 3 9 28 9 24 78 0 0 27 22 13 17 51 54 2 74 -60 26 40 17 28 4 32 26 19 27 28 25 50 79 0 0 27 38 44 17 51 55 3 75 -60 26 56 45 28 21 5 26 35 54 28 42 25 80 0 0 27 55 24 17 51 55 4 75 -60 27 13 22 28 37 47 26 52 30 28 59 8 81 0 0 28 12 12 17 51 56 5 76 -60 27 30 8 28 54 38 27 9 14 29 16 0 82 0 0 28 29 7 17 51 56 6 76 -60 27 47 1 29 11 36 27 26 6 29 32 59 83 0 0 28 46 11 17 51 57 7 77 -60 28 4 2 29 28 42 27 43 6 29 50 6 84 0 0 29 3 21 17 51 58 8 77 -60 28 21 10 29 45 54 28 0 13 30 7 20 85 0 0 29 20 38 17 51 59 9 78 -60 28 38 25 30 3 14 28 17 27 30 24 40 86 0 0 29 38 1 17 52 1 10 78 -59 28 55 46 30 20 39 28 34 47 30 42 7 87 0 0 29 55 31 17 52 2 10 79 -59 29 13 14 30 38 11 28 52 13 30 59 39 88 0 0 30 13 5 17 52 3 11 79 -59 29 30 46 30 55 47 29 9 45 31 17 17 89 0 0 30 30 45 17 52 5 12 80 -59 29 48 24 31 13 29 29 27 22 31 35 0 90 0 0 30 48 29 17 52 7 13 80 -59 30 6 7 31 31 15 29 45 4 31 52 47 91 0 0 31 6 18 17 52 8 14 81 -58 30 23 53 31 49 5 30 2 49 32 10 38 92 0 0 31 24 10 17 52 10 15 82 -58 30 41 44 32 6 59 30 20 39 32 28 32 93 0 0 31 42 5 17 52 12 16 82 -58 30 59 38 32 24 56 30 38 32 32 46 30 94 0 0 32 0 3 17 52 15 17 83 -57 31 17 34 32 42 55 30 56 28 33 4 30 95 0 0 32 18 4 17 52 17 18 83 -57 31 35 33 33 0 57 31 14 27 33 22 33 96 0 0 32 36 6 17 52 19 19 84 -56 31 53 35 33 19 1 31 32 27 33 40 37 97 0 0 32 54 10 17 52 22 19 85 -56 32 11 37 33 37 6 31 50 29 33 58 43 98 0 0 33 12 15 17 52 24 20 85 -55 32 29 41 33 55 12 32 8 33 34 16 49 99 0 0 33 30 20 17 52 27 21 86 -55 32 47 46 34 13 18 32 26 37 34 34 56 100 0 0 33 48 26 17 52 30 22 86 -54 33 5 51 34 31 25 32 44 41 34 53 3 101 0 0 34 6 31 17 52 32 23 87 -54 33 23 55 34 49 31 33 2 45 35 11 10 102 0 0 34 24 36 17 52 35 24 88 -53 33 41 59 35 7 36 33 20 49 35 29 15 103 0 0 34 42 40 17 52 38 25 89 -53 34 0 2 35 25 40 33 38 52 35 47 19 104 0 0 35 0 41 17 52 42 25 89 -52 34 18 4 35 43 42 33 56 53 36 5 22 105 0 0 35 18 41 17 52 45 26 90 -51 34 36 3 36 1 43 34 14 53 36 23 22 106 0 0 35 36 39 17 52 48 27 91 -51 34 54 1 36 19 40 34 32 50 36 41 20 107 0 0 35 54 33 17 52 51 28 91 -50 35 11 55 36 37 35 34 50 44 36 59 14 108 0 0 36 12 25 17 52 55 29 92 -50 35 29 46 36 55 26 35 8 36 37 17 6 109 0 0 36 30 12 17 52 58 29 93 -49 35 47 34 37 13 13 35 26 24 37 34 53 110 0 0 36 47 56 17 53 2 30 94 -48 36 5 18 37 30 56 35 44 8 37 52 36 111 0 0 37 5 35 17 53 6 31 95 -48 36 22 57 37 48 35 36 1 47 38 10 14 112 0 0 37 23 9 17 53 10 32 95 -47 36 40 32 38 6 9 36 19 22 38 27 47 113 0 0 37 40 38 17 53 13 33 96 -46 36 58 1 38 23 37 36 36 52 38 45 15 114 0 0 37 58 1 17 53 17 33 97 -45 37 15 25 38 40 59 36 54 16 39 2 37 115 0 0 38 15 18 17 53 21 34 98 -45 37 32 43 38 58 15 37 11 35 39 19 53 116 0 0 38 32 29 17 53 25 35 99 -44 37 49 55 39 15 25 37 28 47 39 37 2 117 0 0 38 49 33 17 53 29 36 100 -43 38 7 0 39 32 28 37 45 52 39 54 5 118 0 0 39 6 30 17 53 33 36 101 -43 38 23 58 39 49 24 38 2 51 40 11 0 119 0 0 39 23 19 17 53 38 37 102 -42 38 40 49 40 6 12 38 19 43 40 27 47 120 0 0 39 40 1 17 53 42 38 103 -41 38 57 32 40 22 52 38 36 26 40 44 27 121 0 0 39 56 35 17 53 46 38 104 -40 39 14 8 40 39 24 38 53 2 41 0 58 122 0 0 40 13 0 17 53 50 39 105 -40 39 30 34 40 55 48 39 9 30 41 17 21 123 0 0 40 29 16 17 53 55 40 106 -39 39 46 53 41 12 3 39 25 49 41 33 35 124 0 0 40 45 24 17 53 59 40 107 -38 40 3 2 41 28 9 39 41 59 41 49 40 125 0 0 41 1 22 17 54 4 41 108 -38 40 19 2 41 44 5 39 58 0 42 5 35 126 0 0 41 17 11 17 54 8 42 109 -37 40 34 53 41 59 52 40 13 52 42 21 21 127 0 0 41 32 50 17 54 13 42 110 -36 40 50 34 42 15 28 40 29 34 42 36 56 128 0 0 41 48 19 17 54 17 43 111 -35 41 6 5 42 30 55 40 45 6 42 52 22 129 0 0 42 3 37 17 54 22 44 112 -35 41 21 26 42 46 11 41 0 28 43 7 37 130 0 0 42 18 45 17 54 27 44 114 -34 41 36 36 43 1 17 41 15 39 43 22 41 131 0 0 42 33 42 17 54 31 45 115 -33 41 51 35 43 16 11 41 30 40 43 37 35 132 0 0 42 48 28 17 54 36 45 116 -32 42 6 24 43 30 55 41 45 29 43 52 17 133 0 0 43 3 3 17 54 41 46 117 -32 42 21 1 43 45 27 42 0 8 44 6 48 134 0 0 43 17 26 17 54 45 46 119 -31 42 35 27 43 59 48 42 14 35 44 21 7 135 0 0 43 31 38 17 54 50 47 120 -30 42 49 41 44 13 57 42 28 51 44 35 15 136 0 0 43 45 38 17 54 55 48 121 -29 43 3 44 44 27 54 42 42 55 44 49 11 137 0 0 43 59 26 17 55 0 48 123 -29 43 17 34 44 41 39 42 56 47 45 2 55 138 0 0 44 13 2 17 55 5 49 124 -28 43 31 13 44 55 12 43 10 27 45 16 26 139 0 0 44 26 25 17 55 9 49 125 -27 43 44 39 45 8 33 43 23 54 45 29 45 140 0 0 44 39 36 17 55 14 49 127 -26 43 57 53 45 21 41 43 37 9 45 42 52 141 0 0 44 52 34 17 55 19 50 128 -26 44 10 54 45 34 36 43 50 12 45 55 46 142 0 0 45 5 20 17 55 24 50 130 -25 44 23 43 45 47 19 44 3 2 46 8 27 143 0 0 45 17 53 17 55 29 51 131 -24 44 36 18 45 59 49 44 15 39 46 20 55 144 0 0 45 30 12 17 55 34 51 133 -23 44 48 41 46 12 5 44 28 3 46 33 10 145 0 0 45 42 19 17 55 38 51 134 -23 45 0 51 46 24 9 44 40 14 46 45 12 146 0 0 45 54 12 17 55 43 52 136 -22 45 12 47 46 35 59 44 52 12 46 57 1 147 0 0 46 5 53 17 55 48 52 137 -21 45 24 30 46 47 36 45 3 56 47 8 36 148 0 0 46 17 19 17 55 53 53 139 -21 45 36 0 46 59 0 45 15 27 47 19 58 149 0 0 46 28 32 17 55 58 53 141 -20 45 47 16 47 10 10 45 26 45 47 31 7 150 0 0 46 39 32 17 56 3 53 142 -19 45 58 18 47 21 7 45 37 49 47 42 2 151 0 0 46 50 18 17 56 8 53 144 -18 46 9 7 47 31 50 45 48 40 47 52 43 152 0 0 47 0 50 17 56 12 54 146 -18 46 19 43 47 42 19 45 59 16 48 3 11 153 0 0 47 11 9 17 56 17 54 147 -17 46 30 4 47 52 34 46 9 39 48 13 25 154 0 0 47 21 13 17 56 22 54 149 -16 46 40 12 48 2 36 46 19 48 48 23 25 155 0 0 47 31 4 17 56 27 54 151 -16 46 50 5 48 12 24 46 29 44 48 33 11 156 0 0 47 40 41 17 56 32 55 152 -15 46 59 45 48 21 58 46 39 25 48 42 44 157 0 0 47 50 4 17 56 36 55 154 -14 47 9 11 48 31 18 46 48 52 48 52 2 158 0 0 47 59 13 17 56 41 55 156 -13 47 18 23 48 40 24 46 58 5 49 1 7 159 0 0 48 8 8 17 56 46 55 157 -13 47 27 21 48 49 16 47 7 4 49 9 58 160 0 0 48 16 49 17 56 51 55 159 -12 47 36 4 48 57 54 47 15 49 49 18 34 161 0 0 48 25 16 17 56 56 55 161 -11 47 44 34 49 6 18 47 24 20 49 26 57 162 0 0 48 33 28 17 57 0 55 163 -11 47 52 49 49 14 28 47 32 37 49 35 5 163 0 0 48 41 27 17 57 5 55 165 -10 48 0 50 49 22 24 47 40 39 49 43 0 164 0 0 48 49 11 17 57 10 55 166 -9 48 8 37 49 30 5 47 48 28 49 50 40 165 0 0 48 56 42 17 57 15 55 168 -9 48 16 10 49 37 33 47 56 2 49 58 6 166 0 0 49 3 58 17 57 19 55 170 -8 48 23 29 49 44 47 48 3 22 50 5 19 167 0 0 49 11 0 17 57 24 55 172 -7 48 30 33 49 51 46 48 10 27 50 12 17 168 0 0 49 17 47 17 57 29 55 173 -7 48 37 23 49 58 31 48 17 18 50 19 1 169 0 0 49 24 21 17 57 33 55 175 -6 48 43 59 50 5 3 48 23 56 50 25 31 170 0 0 49 30 41 17 57 38 55 177 -5 48 50 21 50 11 20 48 30 18 50 31 47 171 0 0 49 36 46 17 57 42 55 179 -5 48 56 28 50 17 23 48 36 27 50 37 49 172 0 0 49 42 37 17 57 47 55 180 -4 49 2 22 50 23 12 48 42 21 50 43 37 173 0 0 49 48 14 17 57 52 55 182 -3 49 8 1 50 28 47 48 48 1 50 49 11 174 0 0 49 53 37 17 57 56 55 184 -3 49 13 25 50 34 7 48 53 27 50 54 30 175 0 0 49 58 45 17 58 1 55 185 -2 49 18 36 50 39 14 48 58 38 50 59 36 176 0 0 50 3 40 17 58 5 55 187 -1 49 23 32 50 44 7 49 3 35 51 4 28 177 0 0 50 8 20 17 58 10 54 189 -1 49 28 14 50 48 45 49 8 18 51 9 5 Uncertainty in time = +/- 2 secs Prediction of 2012 Aug 7.0 Data for the target star ------------------------ * name: TYC 0712-00441-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 24 22.1193 DE: +14 46 22.797 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .025 ) * V mag [mag]: 11.9 * B mag [mag]: 12.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (521) Brixia approx. diameter [km]: 122 approx. diameter ["]: .107 distance from Earth [AU]: 1.57700 * orbital information: orbit source: Preston date of fit: 2012 Aug 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 940 number of rejected observations: 74 time covered by the observations: 1904 Jan 10 - 2011 Sep 01 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.010, 71° remarks: * orbital elements for (521) Brixia : Mean anomaly = 2.24283387 deg Arg. of pericenter = 316.22945250 deg Long. of node = 89.66591072 deg Inclination = 10.59780565 deg Eccentricity = 0.28330849 Semimajor axis = 2.73993871 AU Perihelion dist = 1.96369081 AU Mag: H = 8.15, G = -0.06 Epoch of elements : MJD 56190.74800000 TDT (2012 Sep 20.748) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 20 521 Brixia 17h 57.3m UT 11.9 5 24 22.119 14 46 22.80TYC 0712-00441-1 12.5 12.5 122 7.6 1.577 3.478 6.03 171.7422 14.772 -91.02 0.73 17.9549 -0.07177 0.55986 9.04977 1.08108 -0.00515 -0.00023 2000 2.0802812012 920.00000316.229453 89.665911 10.5978060.28330849 2.7399387 1.9636908 8.3 5.0-.06 RATE 2.1731660 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.027 81 1.25 0.027 0 0 3-3 056146.0020120920_0441-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 06, 20:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org