IOTA/IOTA-ES occultation update for (521) Brixia / UCAC2 36769086 event on 2012 Sep 11, 20:20 UT Visible from N Russia Summary ------- On 2012 Sep 11 UT, the 122 km diameter asteroid (521) Brixia will occult a 11.4 mag star in the constellation Orion for observers along a path across N Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.5 mag to 12.6 mag (the magnitude of the asteroid) for at most 6.4 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 11, 20:17 - 2012 Sep 11, 20:21 UT * geocentric midpoint of event [JD]: 2456182.34775417 * magnitude of target star: 11.4 * magnitude drop [mag]: 1.5 * estimated maximum duration [s]: 6.4 * Moon: 20 % sunlit, 38° distance * Sun: 91° distance * rough path description: N Russia The occultation path -------------------- * approximate projected width [km]: 209 * 1 sigma uncertainty interval [path widths]: +/- 0.79 * 1 sigma uncertainty interval [seconds]: +/- 5.1 * 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]: 19.1077 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 36769086 by 521 Brixia on 2012 Sep 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 38 0 0 46 0 25 20 17 32 1 70 -38 44 59 55 47 2 35 .. .. .. 48 44 32 39 0 0 46 16 45 20 17 33 1 71 -38 45 16 6 47 19 3 .. .. .. 49 1 16 40 0 0 46 33 17 20 17 33 2 71 -38 45 32 30 47 35 43 .. .. .. 49 18 12 41 0 0 46 49 59 20 17 33 3 72 -38 45 49 4 47 52 35 .. .. .. 49 35 19 42 0 0 47 6 53 20 17 34 4 73 -38 46 5 50 48 9 37 .. .. .. 49 52 37 43 0 0 47 23 57 20 17 34 4 73 -38 46 22 45 48 26 50 .. .. .. 50 10 6 44 0 0 47 41 10 20 17 35 5 74 -37 46 39 51 48 44 12 .. .. .. 50 27 43 45 0 0 47 58 34 20 17 35 6 75 -37 46 57 6 49 1 44 .. .. .. 50 45 30 46 0 0 48 16 5 20 17 36 7 76 -37 47 14 30 49 19 24 .. .. .. 51 3 26 47 0 0 48 33 45 20 17 37 7 76 -37 47 32 3 49 37 13 .. .. .. 51 21 29 48 0 0 48 51 33 20 17 38 8 77 -37 47 49 43 49 55 9 .. .. .. 51 39 40 49 0 0 49 9 28 20 17 39 9 78 -37 48 7 30 50 13 12 46 32 49 51 57 58 50 0 0 49 27 30 20 17 40 9 79 -36 48 25 24 50 31 22 46 50 33 52 16 22 51 0 0 49 45 38 20 17 42 10 80 -36 48 43 25 50 49 38 47 8 23 52 34 52 52 0 0 50 3 51 20 17 43 11 80 -36 49 1 31 51 7 59 47 26 19 52 53 27 53 0 0 50 22 10 20 17 44 11 81 -36 49 19 43 51 26 25 47 44 20 53 12 7 54 0 0 50 40 32 20 17 46 12 82 -35 49 37 59 51 44 55 48 2 26 53 30 50 55 0 0 50 58 59 20 17 47 13 83 -35 49 56 19 52 3 29 48 20 37 53 49 37 56 0 0 51 17 29 20 17 49 13 84 -35 50 14 42 52 22 6 48 38 51 54 8 27 57 0 0 51 36 2 20 17 51 14 85 -34 50 33 9 52 40 46 48 57 9 54 27 18 58 0 0 51 54 37 20 17 52 15 85 -34 50 51 38 52 59 27 49 15 29 54 46 11 59 0 0 52 13 13 20 17 54 15 86 -34 51 10 9 53 18 10 49 33 52 55 5 5 60 0 0 52 31 51 20 17 56 16 87 -33 51 28 41 53 36 54 49 52 16 55 24 0 61 0 0 52 50 29 20 17 58 17 88 -33 51 47 14 53 55 38 50 10 42 55 42 54 62 0 0 53 9 8 20 18 0 17 89 -32 52 5 47 54 14 22 50 29 8 56 1 47 63 0 0 53 27 45 20 18 2 18 90 -32 52 24 20 54 33 4 50 47 34 56 20 39 64 0 0 53 46 21 20 18 4 18 91 -32 52 42 52 54 51 45 51 5 59 56 39 29 65 0 0 54 4 56 20 18 6 19 92 -31 53 1 22 55 10 25 51 24 24 56 58 17 66 0 0 54 23 29 20 18 9 20 93 -31 53 19 51 55 29 1 51 42 47 57 17 1 67 0 0 54 41 58 20 18 11 20 93 -30 53 38 17 55 47 35 52 1 8 57 35 41 68 0 0 55 0 25 20 18 13 21 94 -30 53 56 40 56 6 5 52 19 27 57 54 18 69 0 0 55 18 48 20 18 16 21 95 -29 54 15 0 56 24 31 52 37 43 58 12 49 70 0 0 55 37 6 20 18 18 22 96 -29 54 33 16 56 42 52 52 55 55 58 31 15 71 0 0 55 55 20 20 18 20 22 97 -29 54 51 27 57 1 8 53 14 3 58 49 36 72 0 0 56 13 28 20 18 23 23 98 -28 55 9 34 57 19 18 53 32 7 59 7 50 73 0 0 56 31 30 20 18 25 23 99 -28 55 27 35 57 37 23 53 50 6 59 25 57 74 0 0 56 49 27 20 18 28 24 100 -27 55 45 30 57 55 20 54 7 59 59 43 57 75 0 0 57 7 16 20 18 31 24 101 -27 56 3 19 58 13 11 54 25 47 60 1 49 76 0 0 57 24 59 20 18 33 25 102 -26 56 21 1 58 30 54 54 43 28 60 19 34 77 0 0 57 42 34 20 18 36 25 103 -26 56 38 36 58 48 29 55 1 3 60 37 9 78 0 0 58 0 1 20 18 38 26 105 -25 56 56 3 59 5 56 55 18 30 60 54 36 79 0 0 58 17 20 20 18 41 26 106 -25 57 13 22 59 23 14 55 35 50 61 11 53 80 0 0 58 34 30 20 18 44 27 107 -24 57 30 33 59 40 24 55 53 3 61 29 0 81 0 0 58 51 31 20 18 47 27 108 -24 57 47 35 59 57 23 56 10 7 61 45 57 82 0 0 59 8 23 20 18 49 27 109 -23 58 4 29 60 14 13 56 27 2 62 2 44 83 0 0 59 25 4 20 18 52 28 110 -23 58 21 12 60 30 53 56 43 49 62 19 20 84 0 0 59 41 36 20 18 55 28 111 -22 58 37 46 60 47 22 57 0 26 62 35 45 85 0 0 59 57 57 20 18 58 29 112 -22 58 54 10 61 3 40 57 16 53 62 51 58 86 0 0 60 14 8 20 19 0 29 113 -21 59 10 24 61 19 48 57 33 11 63 8 0 87 0 0 60 30 8 20 19 3 29 114 -21 59 26 27 61 35 44 57 49 19 63 23 50 88 0 0 60 45 56 20 19 6 30 115 -20 59 42 19 61 51 28 58 5 16 63 39 27 89 0 0 61 1 33 20 19 9 30 117 -20 59 58 0 62 7 1 58 21 2 63 54 52 90 0 0 61 16 58 20 19 12 30 118 -19 60 13 29 62 22 22 58 36 38 64 10 5 91 0 0 61 32 12 20 19 14 31 119 -19 60 28 47 62 37 30 58 52 2 64 25 4 92 0 0 61 47 13 20 19 17 31 120 -18 60 43 53 62 52 26 59 7 15 64 39 51 93 0 0 62 2 2 20 19 20 31 121 -18 60 58 47 63 7 9 59 22 16 64 54 25 94 0 0 62 16 38 20 19 23 31 122 -17 61 13 29 63 21 40 59 37 6 65 8 45 95 0 0 62 31 2 20 19 26 32 124 -17 61 27 58 63 35 58 59 51 43 65 22 52 96 0 0 62 45 13 20 19 28 32 125 -16 61 42 15 63 50 3 60 6 8 65 36 45 97 0 0 62 59 11 20 19 31 32 126 -16 61 56 19 64 3 54 60 20 21 65 50 25 98 0 0 63 12 56 20 19 34 32 127 -15 62 10 11 64 17 33 60 34 22 66 3 51 99 0 0 63 26 28 20 19 37 33 128 -15 62 23 49 64 30 58 60 48 10 66 17 4 100 0 0 63 39 47 20 19 39 33 130 -14 62 37 15 64 44 9 61 1 45 66 30 2 101 0 0 63 52 53 20 19 42 33 131 -14 62 50 27 64 57 7 61 15 7 66 42 47 102 0 0 64 5 45 20 19 45 33 132 -13 63 3 27 65 9 52 61 28 17 66 55 18 103 0 0 64 18 24 20 19 48 33 133 -13 63 16 13 65 22 23 61 41 14 67 7 35 104 0 0 64 30 50 20 19 50 34 134 -12 63 28 46 65 34 40 61 53 57 67 19 38 105 0 0 64 43 2 20 19 53 34 136 -12 63 41 6 65 46 44 62 6 28 67 31 28 106 0 0 64 55 0 20 19 56 34 137 -11 63 53 12 65 58 34 62 18 45 67 43 3 107 0 0 65 6 46 20 19 58 34 138 -11 64 5 5 66 10 11 62 30 49 67 54 25 108 0 0 65 18 17 20 20 1 34 139 -10 64 16 44 66 21 34 62 42 40 68 5 33 109 0 0 65 29 35 20 20 3 34 140 -10 64 28 11 66 32 44 62 54 18 68 16 27 110 0 0 65 40 40 20 20 6 34 142 -9 64 39 23 66 43 40 63 5 42 68 27 7 111 0 0 65 51 31 20 20 9 35 143 -9 64 50 23 66 54 22 63 16 53 68 37 34 112 0 0 66 2 9 20 20 11 35 144 -9 65 1 9 67 4 51 63 27 51 68 47 47 113 0 0 66 12 34 20 20 14 35 145 -8 65 11 42 67 15 6 63 38 36 68 57 47 114 0 0 66 22 45 20 20 16 35 147 -8 65 22 1 67 25 9 63 49 7 69 7 33 115 0 0 66 32 43 20 20 19 35 148 -7 65 32 7 67 34 57 63 59 25 69 17 6 116 0 0 66 42 27 20 20 21 35 149 -7 65 42 0 67 44 33 64 9 30 69 26 26 117 0 0 66 51 59 20 20 24 35 150 -6 65 51 40 67 53 55 64 19 22 69 35 32 118 0 0 67 1 17 20 20 26 35 152 -6 66 1 7 68 3 5 64 29 1 69 44 25 119 0 0 67 10 22 20 20 29 35 153 -6 66 10 20 68 12 1 64 38 27 69 53 6 120 0 0 67 19 14 20 20 31 35 154 -5 66 19 21 68 20 44 64 47 39 70 1 33 121 0 0 67 27 54 20 20 34 35 155 -5 66 28 8 68 29 15 64 56 39 70 9 48 122 0 0 67 36 20 20 20 36 35 156 -4 66 36 43 68 37 32 65 5 25 70 17 50 123 0 0 67 44 34 20 20 38 35 158 -4 66 45 5 68 45 37 65 13 59 70 25 40 124 0 0 67 52 35 20 20 41 35 159 -4 66 53 14 68 53 30 65 22 20 70 33 17 125 0 0 68 0 24 20 20 43 35 160 -3 67 1 11 69 1 10 65 30 28 70 40 42 126 0 0 68 8 0 20 20 45 35 161 -3 67 8 55 69 8 37 65 38 24 70 47 54 127 0 0 68 15 24 20 20 48 35 163 -2 67 16 26 69 15 52 65 46 6 70 54 55 128 0 0 68 22 35 20 20 50 35 164 -2 67 23 46 69 22 55 65 53 37 71 1 43 129 0 0 68 29 34 20 20 52 35 165 -2 67 30 52 69 29 46 66 0 54 71 8 20 130 0 0 68 36 21 20 20 55 35 166 -1 67 37 47 69 36 25 66 8 0 71 14 44 131 0 0 68 42 56 20 20 57 35 167 -1 67 44 29 69 42 52 66 14 53 71 20 57 132 0 0 68 49 19 20 20 59 35 169 0 67 50 59 69 49 7 66 21 33 71 26 59 133 0 0 68 55 30 20 21 1 35 170 0 67 57 17 69 55 11 66 28 2 71 32 49 Uncertainty in time = +/- 5 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: UCAC2 36769086 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 11 13.3009 DE: +14 23 33.535 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .080, .080 ) * V mag [mag]: 11.4 * 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 ["]: .101 distance from Earth [AU]: 1.66500 * 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 = 0.30774114 deg Arg. of pericenter = 316.23104928 deg Long. of node = 89.66617217 deg Inclination = 10.59775106 deg Eccentricity = 0.28329323 Semimajor axis = 2.73988121 AU Perihelion dist = 1.96369141 AU Mag: H = 8.15, G = -0.06 Epoch of elements : MJD 56181.84800000 TDT (2012 Sep 11.848) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 11 521 Brixia 20h 20.8m UT 11.4 5 11 13.301 14 23 33.53UCAC2 36769086 0.0 12.6 122 6.4 1.665 3.892 6.86 141.3594 14.392 -126.10 4.16 20.3461 -0.09850 0.80609 10.70641 1.29911 -0.00515 -0.00042 2000 359.9061272012 910.00000316.231049 89.666172 10.5977510.28329323 2.7398812 1.9636914 8.3 5.0-.06 RATE 2.1732340 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.083 0.080 88 1.79 0.080 0 0-1 5 056129.0020120911_769086 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 15:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org