IOTA/IOTA-ES occultation update for (521) Brixia / 2UCAC 36768798 event on 2012 Sep 10, 17:44 UT Visible from Japan, China Summary ------- On 2012 Sep 10 UT, the 122 km diameter asteroid (521) Brixia will occult a 13.0 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 0.6 mag to 12.6 mag (the magnitude of the asteroid) for at most 6.3 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: 72 * date and approx. time of event: 2012 Sep 10, 17:40 - 2012 Sep 10, 17:44 UT * geocentric midpoint of event [JD]: 2456181.23939167 * magnitude of target star: 13.0 * magnitude drop [mag]: 0.6 * estimated maximum duration [s]: 6.3 * Moon: 30 % sunlit, 25° distance * Sun: 91° distance * rough path description: Japan, China The occultation path -------------------- * approximate projected width [km]: 148 * 1 sigma uncertainty interval [path widths]: +/- 0.80 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .083 +/- .080) * 1 sigma uncertainty ellipse (major, minor, PA): ( .083", .080", 88° ) * approx speed of asteroid's shadow [km/s]: 19.4670 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 36768798 by 521 Brixia on 2012 Sep 10 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 85 0 0 26 53 9 17 40 15 0 74 -57 .. .. .. 27 35 21 .. .. .. 28 43 40 86 0 0 27 8 50 17 40 15 1 74 -57 26 26 58 27 51 4 .. .. .. 28 59 28 87 0 0 27 24 40 17 40 15 2 75 -57 26 42 45 28 6 57 .. .. .. 29 15 24 88 0 0 27 40 39 17 40 15 3 75 -57 26 58 42 28 22 58 .. .. .. 29 31 30 89 0 0 27 56 47 17 40 16 4 76 -57 27 14 48 28 39 9 .. .. .. 29 47 45 90 0 0 28 13 4 17 40 16 5 76 -57 27 31 2 28 55 28 .. .. .. 30 4 8 91 0 0 28 29 29 17 40 17 6 77 -57 27 47 25 29 11 55 26 40 51 30 20 39 92 0 0 28 46 1 17 40 18 7 77 -57 28 3 55 29 28 30 26 57 17 30 37 18 93 0 0 29 2 41 17 40 18 7 78 -56 28 20 33 29 45 13 27 13 52 30 54 4 94 0 0 29 19 28 17 40 19 8 78 -56 28 37 17 30 2 2 27 30 33 31 10 57 95 0 0 29 36 22 17 40 20 9 79 -56 28 54 9 30 18 57 27 47 21 31 27 56 96 0 0 29 53 21 17 40 21 10 79 -56 29 11 6 30 35 59 28 4 16 31 45 1 97 0 0 30 10 26 17 40 23 11 80 -55 29 28 10 30 53 6 28 21 16 32 2 12 98 0 0 30 27 37 17 40 24 12 80 -55 29 45 18 31 10 19 28 38 22 32 19 27 99 0 0 30 44 53 17 40 25 13 81 -54 30 2 32 31 27 36 28 55 33 32 36 48 100 0 0 31 2 13 17 40 27 14 81 -54 30 19 50 31 44 58 29 12 48 32 54 12 101 0 0 31 19 37 17 40 28 15 82 -54 30 37 13 32 2 23 29 30 8 33 11 41 102 0 0 31 37 4 17 40 30 16 82 -53 30 54 39 32 19 53 29 47 32 33 29 13 103 0 0 31 54 35 17 40 32 16 83 -53 31 12 8 32 37 25 30 4 59 33 46 48 104 0 0 32 12 9 17 40 33 17 84 -52 31 29 40 32 55 0 30 22 29 34 4 25 105 0 0 32 29 45 17 40 35 18 84 -52 31 47 15 33 12 37 30 40 1 34 22 4 106 0 0 32 47 22 17 40 37 19 85 -51 32 4 52 33 30 16 30 57 36 34 39 46 107 0 0 33 5 2 17 40 39 20 85 -50 32 22 30 33 47 57 31 15 13 34 57 28 108 0 0 33 22 42 17 40 42 21 86 -50 32 40 9 34 5 38 31 32 50 35 15 11 109 0 0 33 40 23 17 40 44 22 87 -49 32 57 49 34 23 20 31 50 29 35 32 54 110 0 0 33 58 4 17 40 46 23 87 -49 33 15 30 34 41 2 32 8 8 35 50 38 111 0 0 34 15 45 17 40 49 23 88 -48 33 33 10 34 58 44 32 25 47 36 8 21 112 0 0 34 33 25 17 40 51 24 89 -47 33 50 50 35 16 25 32 43 26 36 26 3 113 0 0 34 51 5 17 40 54 25 89 -47 34 8 28 35 34 4 33 1 4 36 43 43 114 0 0 35 8 42 17 40 56 26 90 -46 34 26 6 35 51 43 33 18 41 37 1 22 115 0 0 35 26 18 17 40 59 27 91 -45 34 43 41 36 9 19 33 36 16 37 18 59 116 0 0 35 43 52 17 41 2 28 92 -45 35 1 15 36 26 52 33 53 49 37 36 33 117 0 0 36 1 23 17 41 5 28 92 -44 35 18 45 36 44 23 34 11 20 37 54 4 118 0 0 36 18 50 17 41 8 29 93 -43 35 36 13 37 1 51 34 28 48 38 11 31 119 0 0 36 36 15 17 41 11 30 94 -43 35 53 38 37 19 15 34 46 12 38 28 55 120 0 0 36 53 35 17 41 14 31 95 -42 36 10 58 37 36 35 35 3 33 38 46 15 121 0 0 37 10 51 17 41 17 32 96 -41 36 28 15 37 53 51 35 20 50 39 3 30 122 0 0 37 28 2 17 41 20 32 96 -41 36 45 26 38 11 2 35 38 3 39 20 40 123 0 0 37 45 9 17 41 23 33 97 -40 37 2 33 38 28 7 35 55 11 39 37 44 124 0 0 38 2 10 17 41 26 34 98 -39 37 19 35 38 45 8 36 12 13 39 54 43 125 0 0 38 19 5 17 41 30 35 99 -38 37 36 31 39 2 2 36 29 11 40 11 36 126 0 0 38 35 54 17 41 33 35 100 -38 37 53 21 39 18 50 36 46 2 40 28 23 127 0 0 38 52 37 17 41 36 36 101 -37 38 10 5 39 35 32 37 2 47 40 45 3 128 0 0 39 9 12 17 41 40 37 102 -36 38 26 42 39 52 7 37 19 26 41 1 36 129 0 0 39 25 41 17 41 43 37 103 -35 38 43 11 40 8 34 37 35 57 41 18 1 130 0 0 39 42 2 17 41 47 38 104 -35 38 59 34 40 24 54 37 52 22 41 34 19 131 0 0 39 58 16 17 41 50 39 105 -34 39 15 49 40 41 6 38 8 39 41 50 29 132 0 0 40 14 21 17 41 54 40 106 -33 39 31 56 40 57 10 38 24 48 42 6 30 133 0 0 40 30 19 17 41 58 40 107 -32 39 47 55 41 13 5 38 40 50 42 22 23 134 0 0 40 46 7 17 42 1 41 108 -32 40 3 45 41 28 52 38 56 42 42 38 7 135 0 0 41 1 47 17 42 5 41 109 -31 40 19 26 41 44 30 39 12 26 42 53 42 136 0 0 41 17 17 17 42 9 42 110 -30 40 34 58 41 59 59 39 28 1 43 9 7 137 0 0 41 32 38 17 42 13 43 111 -29 40 50 21 42 15 18 39 43 27 43 24 23 138 0 0 41 47 49 17 42 17 43 113 -29 41 5 34 42 30 27 39 58 44 43 39 28 139 0 0 42 2 51 17 42 20 44 114 -28 41 20 38 42 45 26 40 13 50 43 54 24 140 0 0 42 17 42 17 42 24 45 115 -27 41 35 31 43 0 15 40 28 47 44 9 9 141 0 0 42 32 22 17 42 28 45 116 -26 41 50 14 43 14 53 40 43 33 44 23 44 142 0 0 42 46 52 17 42 32 46 117 -26 42 4 46 43 29 21 40 58 9 44 38 8 143 0 0 43 1 12 17 42 36 46 119 -25 42 19 8 43 43 38 41 12 34 44 52 21 144 0 0 43 15 20 17 42 40 47 120 -24 42 33 19 43 57 44 41 26 49 45 6 22 145 0 0 43 29 17 17 42 44 47 121 -23 42 47 18 44 11 38 41 40 52 45 20 13 146 0 0 43 43 3 17 42 48 48 123 -23 43 1 6 44 25 21 41 54 44 45 33 52 147 0 0 43 56 37 17 42 52 48 124 -22 43 14 43 44 38 53 42 8 25 45 47 19 148 0 0 44 9 59 17 42 56 49 125 -21 43 28 8 44 52 12 42 21 54 46 0 34 149 0 0 44 23 9 17 43 0 49 127 -20 43 41 21 45 5 20 42 35 11 46 13 37 150 0 0 44 36 8 17 43 4 50 128 -20 43 54 22 45 18 16 42 48 16 46 26 28 151 0 0 44 48 54 17 43 8 50 130 -19 44 7 11 45 30 59 43 1 9 46 39 7 152 0 0 45 1 28 17 43 12 50 131 -18 44 19 47 45 43 30 43 13 50 46 51 33 153 0 0 45 13 49 17 43 16 51 133 -17 44 32 12 45 55 49 43 26 18 47 3 47 154 0 0 45 25 58 17 43 20 51 134 -17 44 44 23 46 7 55 43 38 34 47 15 48 155 0 0 45 37 54 17 43 24 52 136 -16 44 56 22 46 19 48 43 50 37 47 27 37 156 0 0 45 49 37 17 43 28 52 137 -15 45 8 8 46 31 28 44 2 28 47 39 13 157 0 0 46 1 8 17 43 32 52 139 -14 45 19 41 46 42 56 44 14 6 47 50 35 158 0 0 46 12 25 17 43 36 53 140 -14 45 31 2 46 54 10 44 25 30 48 1 45 159 0 0 46 23 30 17 43 40 53 142 -13 45 42 9 47 5 12 44 36 42 48 12 42 160 0 0 46 34 21 17 43 44 53 144 -12 45 53 3 47 16 0 44 47 40 48 23 25 161 0 0 46 44 59 17 43 48 53 145 -12 46 3 44 47 26 35 44 58 26 48 33 55 162 0 0 46 55 24 17 43 52 54 147 -11 46 14 11 47 36 57 45 8 58 48 44 12 163 0 0 47 5 35 17 43 56 54 149 -10 46 24 26 47 47 5 45 19 16 48 54 16 164 0 0 47 15 33 17 44 0 54 150 -9 46 34 26 47 57 0 45 29 21 49 4 6 165 0 0 47 25 17 17 44 4 54 152 -9 46 44 14 48 6 42 45 39 13 49 13 43 166 0 0 47 34 48 17 44 8 54 154 -8 46 53 47 48 16 10 45 48 51 49 23 7 167 0 0 47 44 6 17 44 12 55 155 -7 47 3 7 48 25 25 45 58 15 49 32 17 168 0 0 47 53 9 17 44 16 55 157 -7 47 12 14 48 34 26 46 7 26 49 41 13 169 0 0 48 2 0 17 44 20 55 159 -6 47 21 7 48 43 13 46 16 23 49 49 56 170 0 0 48 10 36 17 44 24 55 161 -5 47 29 46 48 51 47 46 25 6 49 58 25 171 0 0 48 18 59 17 44 28 55 162 -5 47 38 11 49 0 7 46 33 36 50 6 41 172 0 0 48 27 8 17 44 32 55 164 -4 47 46 23 49 8 13 46 41 51 50 14 42 173 0 0 48 35 3 17 44 36 55 166 -3 47 54 20 49 16 6 46 49 53 50 22 31 174 0 0 48 42 44 17 44 40 55 168 -3 48 2 4 49 23 45 46 57 41 50 30 6 175 0 0 48 50 12 17 44 44 55 169 -2 48 9 35 49 31 10 47 5 15 50 37 27 176 0 0 48 57 26 17 44 48 55 171 -1 48 16 51 49 38 21 47 12 35 50 44 34 177 0 0 49 4 26 17 44 51 55 173 0 48 23 53 49 45 19 47 19 41 50 51 28 Uncertainty in time = +/- 5 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: 2UCAC 36768798 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 09 29.1195 DE: +14 20 30.419 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .080, .080 ) * V mag [mag]: 13.0 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (521) Brixia approx. diameter [km]: 122 approx. diameter ["]: .100 distance from Earth [AU]: 1.67600 * orbital information: orbit source: Preston date of fit: 2012 Jul 21 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): 0.023, 0.010, 70° remarks: * orbital elements for (521) Brixia : Mean anomaly = 0.06660898 deg Arg. of pericenter = 316.23124256 deg Long. of node = 89.66620524 deg Inclination = 10.59774463 deg Eccentricity = 0.28329124 Semimajor axis = 2.73987363 AU Perihelion dist = 1.96369142 AU Mag: H = 8.15, G = -0.06 Epoch of elements : MJD 56180.73900000 TDT (2012 Sep 10.739) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 10 521 Brixia 17h 44.7m UT 13.0 5 9 29.120 14 20 30.422UCAC 36768798 0.0 12.6 122 6.3 1.676 3.938 7.00 -178.9720 14.341 -86.99 4.58 17.7454 -0.07190 0.56319 10.90642 1.33401 -0.00514 -0.00045 2000 359.9060062012 910.00000316.231243 89.666205 10.5977450.28329124 2.7398736 1.9636914 8.3 5.0-.06 RATE 2.1732430 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.083 0.080 88 1.80 0.081 0 0-5-1 056129.0020120910_768798 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 15:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org