IOTA/IOTA-ES occultation update for (521) Brixia / TYC 1312-00848-1 event on 2012 Oct 22, 07:21 UT Visible from Canada, W USA Summary ------- On 2012 Oct 22 UT, the 122 km diameter asteroid (521) Brixia will occult a 10.5 mag star in the constellation Orion for observers along a path across Canada, W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 11.9 mag (the magnitude of the asteroid) for at most 23.0 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: . The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2012 Oct 22, 07:07 - 2012 Oct 22, 07:33 UT * geocentric midpoint of event [JD]: 2456222.80671667 * magnitude of target star: 10.5 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 23.0 * Moon: 51 % sunlit, 149° distance * Sun: 120° distance * rough path description: Canada, W USA Additional comments ------------------- double star The occultation path -------------------- * approximate projected width [km]: 178 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 6.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .028", 81° ) * approx speed of asteroid's shadow [km/s]: 5.3099 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1312-00848-1 by 521 Brixia on 2012 Oct 22 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 -146 0 0 23 13 21 7 7 56 0 72 -54 .. .. .. 24 5 17 .. .. .. 24 28 26 -145 0 0 23 31 15 7 7 57 1 73 -55 22 39 58 24 23 25 22 17 40 24 46 40 -144 0 0 23 49 50 7 7 57 2 73 -56 22 58 19 24 42 14 22 35 56 25 5 36 -143 0 0 24 9 5 7 7 59 3 74 -57 23 17 20 25 1 44 22 54 51 25 25 12 -142 0 0 24 29 0 7 8 0 4 74 -58 23 37 1 25 21 54 23 14 25 25 45 29 -141 0 0 24 49 35 7 8 3 5 75 -58 23 57 21 25 42 45 23 34 39 26 6 28 -140 0 0 25 10 51 7 8 6 6 75 -59 24 18 21 26 4 17 23 55 33 26 28 7 -139 0 0 25 32 46 7 8 9 7 75 -60 24 40 1 26 26 29 24 17 5 26 50 26 -138 0 0 25 55 21 7 8 13 8 76 -61 25 2 20 26 49 21 24 39 18 27 13 27 -137 0 0 26 18 36 7 8 17 9 76 -61 25 25 18 27 12 54 25 2 9 27 37 8 -136 0 0 26 42 31 7 8 22 10 77 -62 25 48 56 27 37 7 25 25 39 28 1 29 -135 0 0 27 7 5 7 8 28 11 77 -62 26 13 12 28 2 0 25 49 48 28 26 30 -134 0 0 27 32 19 7 8 34 12 78 -63 26 38 8 28 27 32 26 14 36 28 52 11 -133 0 0 27 58 11 7 8 40 13 78 -63 27 3 41 28 53 43 26 40 2 29 18 31 -132 0 0 28 24 41 7 8 47 14 79 -64 27 29 53 29 20 34 27 6 6 29 45 31 -131 0 0 28 51 50 7 8 55 15 79 -64 27 56 43 29 48 3 27 32 47 30 13 9 -130 0 0 29 19 37 7 9 3 16 80 -65 28 24 10 30 16 10 28 0 6 30 41 26 -129 0 0 29 48 1 7 9 12 17 81 -65 28 52 14 30 44 55 28 28 2 31 10 20 -128 0 0 30 17 1 7 9 21 18 81 -65 29 20 54 31 14 17 28 56 34 31 39 52 -127 0 0 30 46 38 7 9 31 19 82 -66 29 50 11 31 44 15 29 25 41 32 10 0 -126 0 0 31 16 50 7 9 41 19 83 -66 30 20 2 32 14 50 29 55 24 32 40 45 -125 0 0 31 47 37 7 9 51 20 83 -66 30 50 28 32 45 59 30 25 41 33 12 4 -124 0 0 32 18 58 7 10 3 21 84 -66 31 21 28 33 17 43 30 56 32 33 43 59 -123 0 0 32 50 52 7 10 14 22 85 -66 31 53 0 33 50 0 31 27 55 34 16 26 -122 0 0 33 23 19 7 10 27 23 85 -66 32 25 5 34 22 49 31 59 51 34 49 26 -121 0 0 33 56 17 7 10 39 24 86 -66 32 57 41 34 56 10 32 32 18 35 22 58 -120 0 0 34 29 45 7 10 53 25 87 -66 33 30 48 35 30 2 33 5 15 35 57 0 -119 0 0 35 3 42 7 11 6 26 88 -65 34 4 23 36 4 23 33 38 41 36 31 32 -118 0 0 35 38 8 7 11 20 27 89 -65 34 38 26 36 39 11 34 12 35 37 6 31 -117 0 0 36 12 59 7 11 35 28 90 -65 35 12 56 37 14 27 34 46 55 37 41 57 -116 0 0 36 48 17 7 11 50 29 91 -64 35 47 51 37 50 7 35 21 41 38 17 49 -115 0 0 37 23 58 7 12 5 29 92 -64 36 23 11 38 26 12 35 56 52 38 54 4 -114 0 0 38 0 2 7 12 21 30 93 -63 36 58 53 39 2 38 36 32 24 39 30 41 -113 0 0 38 36 26 7 12 37 31 94 -63 37 34 56 39 39 26 37 8 18 40 7 39 -112 0 0 39 13 10 7 12 54 32 95 -62 38 11 18 40 16 32 37 44 32 40 44 56 -111 0 0 39 50 11 7 13 10 33 96 -61 38 47 59 40 53 55 38 21 4 41 22 29 -110 0 0 40 27 28 7 13 28 33 97 -61 39 24 55 41 31 34 38 57 52 42 0 18 -109 0 0 41 4 59 7 13 45 34 98 -60 40 2 6 42 9 27 39 34 54 42 38 21 -108 0 0 41 42 42 7 14 3 35 99 -59 40 39 30 42 47 31 40 12 10 43 16 34 -107 0 0 42 20 35 7 14 21 35 101 -59 41 17 4 43 25 44 40 49 36 43 54 57 -106 0 0 42 58 37 7 14 39 36 102 -58 41 54 47 44 4 5 41 27 11 44 33 27 -105 0 0 43 36 44 7 14 57 37 103 -57 42 32 37 44 42 31 42 4 54 45 12 2 -104 0 0 44 14 56 7 15 16 37 105 -56 43 10 31 45 21 1 42 42 41 45 50 40 -103 0 0 44 53 9 7 15 34 38 106 -55 43 48 29 45 59 31 43 20 32 46 29 18 -102 0 0 45 31 22 7 15 53 38 107 -55 44 26 27 46 38 1 43 58 24 47 7 56 -101 0 0 46 9 34 7 16 12 39 109 -54 45 4 24 47 16 28 44 36 15 47 46 29 -100 0 0 46 47 41 7 16 31 39 110 -53 45 42 18 47 54 49 45 14 3 48 24 57 - 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26 0 0 73 3 53 7 30 45 31 213 -11 72 13 53 73 54 43 71 52 8 74 17 22 - 25 0 0 73 9 38 7 30 50 30 214 -10 72 19 49 74 0 17 71 58 8 74 22 50 - 24 0 0 73 15 8 7 30 55 30 215 -10 72 25 29 74 5 36 72 3 53 74 28 4 - 23 0 0 73 20 23 7 31 0 30 216 -10 72 30 54 74 10 40 72 9 22 74 33 4 - 22 0 0 73 25 23 7 31 4 30 217 -9 72 36 4 74 15 30 72 14 36 74 37 49 - 21 0 0 73 30 9 7 31 9 29 218 -9 72 40 59 74 20 7 72 19 35 74 42 21 - 20 0 0 73 34 41 7 31 13 29 219 -9 72 45 39 74 24 29 72 24 19 74 46 40 - 19 0 0 73 38 59 7 31 18 29 220 -9 72 50 6 74 28 38 72 28 49 74 50 45 - 18 0 0 73 43 3 7 31 22 29 221 -8 72 54 18 74 32 34 72 33 4 74 54 37 - 17 0 0 73 46 53 7 31 27 29 222 -8 72 58 15 74 36 17 72 37 5 74 58 16 - 16 0 0 73 50 30 7 31 31 28 223 -8 73 2 0 74 39 47 72 40 53 75 1 43 - 15 0 0 73 53 54 7 31 35 28 224 -8 73 5 30 74 43 4 72 44 26 75 4 57 - 14 0 0 73 57 5 7 31 39 28 225 -7 73 8 47 74 46 8 72 47 46 75 7 58 - 13 0 0 74 0 3 7 31 43 28 227 -7 73 11 51 74 49 0 72 50 52 75 10 48 - 12 0 0 74 2 48 7 31 47 27 228 -7 73 14 41 74 51 40 72 53 44 75 13 25 - 11 0 0 74 5 21 7 31 51 27 229 -6 73 17 19 74 54 8 72 56 24 75 15 50 - 10 0 0 74 7 41 7 31 55 27 230 -6 73 19 43 74 56 23 72 58 50 75 18 3 - 9 0 0 74 9 49 7 31 59 27 231 -6 73 21 55 74 58 26 73 1 4 75 20 5 - 8 0 0 74 11 44 7 32 3 26 232 -6 73 23 54 75 0 18 73 3 4 75 21 55 - 7 0 0 74 13 28 7 32 7 26 233 -5 73 25 41 75 1 58 73 4 52 75 23 33 - 6 0 0 74 14 59 7 32 10 26 234 -5 73 27 14 75 3 26 73 6 27 75 25 0 - 5 0 0 74 16 18 7 32 14 26 235 -5 73 28 36 75 4 43 73 7 49 75 26 15 - 4 0 0 74 17 25 7 32 18 25 236 -5 73 29 45 75 5 48 73 8 59 75 27 20 - 3 0 0 74 18 20 7 32 21 25 237 -5 73 30 41 75 6 42 73 9 56 75 28 12 - 2 0 0 74 19 3 7 32 25 25 238 -4 73 31 26 75 7 24 73 10 41 75 28 54 - 1 0 0 74 19 35 7 32 29 25 239 -4 73 31 58 75 7 54 73 11 14 75 29 24 0 0 0 74 19 54 7 32 32 25 240 -4 73 32 18 75 8 14 73 11 33 75 29 44 1 0 0 74 20 2 7 32 36 24 241 -4 73 32 25 75 8 22 73 11 41 75 29 52 2 0 0 74 19 58 7 32 39 24 242 -3 73 32 21 75 8 18 73 11 36 75 29 49 3 0 0 74 19 42 7 32 42 24 243 -3 73 32 4 75 8 4 73 11 19 75 29 34 4 0 0 74 19 15 7 32 46 24 244 -3 73 31 35 75 7 38 73 10 49 75 29 9 5 0 0 74 18 36 7 32 49 23 245 -3 73 30 54 75 7 0 73 10 7 75 28 32 6 0 0 74 17 44 7 32 52 23 246 -2 73 30 0 75 6 11 73 9 13 75 27 45 7 0 0 74 16 41 7 32 56 23 247 -2 73 28 54 75 5 11 73 8 6 75 26 46 8 0 0 74 15 26 7 32 59 23 248 -2 73 27 36 75 3 59 73 6 46 75 25 35 9 0 0 74 13 59 7 33 2 22 249 -2 73 26 6 75 2 36 73 5 14 75 24 14 10 0 0 74 12 21 7 33 6 22 250 -1 73 24 23 75 1 1 73 3 30 75 22 41 11 0 0 74 10 30 7 33 9 22 251 -1 73 22 27 74 59 15 73 1 32 75 20 57 12 0 0 74 8 26 7 33 12 22 252 -1 73 20 19 74 57 17 72 59 22 75 19 1 13 0 0 74 6 11 7 33 15 21 254 -1 73 17 59 74 55 7 72 56 59 75 16 53 14 0 0 74 3 43 7 33 18 21 255 0 73 15 25 74 52 45 72 54 24 75 14 34 15 0 0 74 1 3 7 33 21 21 256 0 73 12 39 74 50 11 72 51 35 75 12 3 16 0 0 73 58 10 7 33 24 21 257 0 73 9 40 74 47 25 72 48 33 75 9 20 Uncertainty in time = +/- 7 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 1312-00848-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 55 51.9834 DE: +16 05 17.616 * position source: Pos: Hugh Harris, pm: , pi: * standard error: RA,DE ["]: ( .025, .025 ) * V mag [mag]: 10.5 * B mag [mag]: 10.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (521) Brixia approx. diameter [km]: 122 approx. diameter ["]: .130 distance from Earth [AU]: 1.29000 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 942 number of rejected observations: 74 time covered by the observations: 1904 Jan 10 - 2012 Oct 03 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.012, 74° remarks: * orbital elements for (521) Brixia : Mean anomaly = 9.10434286 deg Arg. of pericenter = 316.22277141 deg Long. of node = 89.66508869 deg Inclination = 10.59803734 deg Eccentricity = 0.28334895 Semimajor axis = 2.74007738 AU Perihelion dist = 1.96367933 AU Mag: H = 8.15, G = -0.06 Epoch of elements : MJD 56222.30700000 TDT (2012 Oct 22.307) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 22 521 Brixia 7h 21.7m UT 10.5 5 55 51.983 16 5 17.62TYC 1312-00848-1 10.8 11.9 122 23.0 1.290 1.308 7.84 -52.5840 16.087 65.70 -11.23 7.3612 -0.27872 0.67081 2.76796 1.14919 -0.00458 0.00031 2000 8.60303220121020.00000316.222771 89.665089 10.5980370.28334895 2.7400774 1.9636793 8.3 5.0-.06 RATE 2.1730000 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.028 81 1.22 0.028 0 0 4-4 056208.0020121022_0848-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 19:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org