IOTA/IOTA-ES occultation update for (191) Kolga / 2UCAC 34257879 event on 2012 Dec 15, 10:04 UT Visible from USA Summary ------- On 2012 Dec 15 UT, the 101 km diameter asteroid (191) Kolga will occult a 12.7 mag star in the constellation Monoceros for observers along a path across USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.1 mag to 13.3 mag (the magnitude of the asteroid) for at most 9.6 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: UCAC. The event at a glimpse ---------------------- * Rank: 86 * date and approx. time of event: 2012 Dec 15, 09:55 - 2012 Dec 15, 10:12 UT * geocentric midpoint of event [JD]: 2456276.9194 * magnitude of target star: 12.7 * magnitude drop [mag]: 1.1 * estimated maximum duration [s]: 9.6 * Moon: 6 % sunlit, 168° distance * Sun: 154° distance * rough path description: USA The occultation path -------------------- * approximate projected width [km]: 115 * 1 sigma uncertainty interval [path widths]: +/- 0.58 * 1 sigma uncertainty interval [seconds]: +/- 5.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .043", 360° ) * approx speed of asteroid's shadow [km/s]: 10.5522 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 34257879 by 191 Kolga on 2012 Dec 15 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 133 0 0 32 16 51 10 12 46 0 81 -26 32 48 23 31 45 28 33 25 9 31 9 16 134 0 0 32 24 39 10 12 46 1 82 -27 32 56 10 31 53 16 33 32 56 31 17 5 135 0 0 32 32 21 10 12 46 2 82 -28 33 3 53 32 1 0 33 40 38 31 24 48 136 0 0 32 40 0 10 12 45 3 83 -29 33 11 30 32 8 38 33 48 16 31 32 27 137 0 0 32 47 33 10 12 45 4 84 -30 33 19 4 32 16 12 33 55 49 31 40 1 138 0 0 32 55 2 10 12 44 4 84 -30 33 26 32 32 23 41 34 3 16 31 47 31 139 0 0 33 2 25 10 12 43 5 85 -31 33 33 55 32 31 4 34 10 39 31 54 55 140 0 0 33 9 43 10 12 42 6 85 -32 33 41 12 32 38 23 34 17 56 32 2 14 141 0 0 33 16 56 10 12 41 7 86 -33 33 48 25 32 45 36 34 25 8 32 9 27 142 0 0 33 24 3 10 12 40 8 86 -34 33 55 32 32 52 44 34 32 15 32 16 36 143 0 0 33 31 5 10 12 38 9 87 -35 34 2 34 32 59 47 34 39 16 32 23 38 144 0 0 33 38 2 10 12 37 9 87 -36 34 9 30 33 6 43 34 46 12 32 30 36 145 0 0 33 44 53 10 12 35 10 88 -36 34 16 20 33 13 34 34 53 1 32 37 27 146 0 0 33 51 38 10 12 33 11 89 -37 34 23 5 33 20 20 34 59 46 32 44 13 147 0 0 33 58 17 10 12 31 12 89 -38 34 29 43 33 26 59 35 6 24 32 50 53 148 0 0 34 4 50 10 12 29 13 90 -39 34 36 16 33 33 33 35 12 56 32 57 27 149 0 0 34 11 17 10 12 27 14 90 -40 34 42 43 33 40 0 35 19 23 33 3 55 150 0 0 34 17 38 10 12 24 14 91 -40 34 49 4 33 46 22 35 25 43 33 10 17 151 0 0 34 23 53 10 12 22 15 91 -41 34 55 18 33 52 37 35 31 57 33 16 33 152 0 0 34 30 2 10 12 19 16 92 -42 35 1 26 33 58 46 35 38 4 33 22 42 153 0 0 34 36 4 10 12 16 17 93 -43 35 7 28 34 4 49 35 44 6 33 28 45 154 0 0 34 42 0 10 12 13 18 93 -44 35 13 24 34 10 45 35 50 1 33 34 42 155 0 0 34 47 49 10 12 10 18 94 -45 35 19 13 34 16 35 35 55 49 33 40 32 156 0 0 34 53 32 10 12 7 19 94 -45 35 24 55 34 22 18 36 1 31 33 46 16 157 0 0 34 59 8 10 12 4 20 95 -46 35 30 31 34 27 55 36 7 7 33 51 53 158 0 0 35 4 38 10 12 0 21 96 -47 35 36 0 34 33 24 36 12 36 33 57 23 159 0 0 35 10 0 10 11 57 22 96 -48 35 41 22 34 38 48 36 17 58 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8 34 258 -23 30 48 15 29 45 14 31 25 6 29 8 58 - 73 0 0 30 8 15 9 57 2 33 258 -22 30 39 51 29 36 49 31 16 42 29 0 33 - 72 0 0 29 59 49 9 56 57 32 259 -21 30 31 24 29 28 23 31 8 15 28 52 6 - 71 0 0 29 51 20 9 56 51 32 260 -20 30 22 56 29 19 54 30 59 47 28 43 37 - 70 0 0 29 42 50 9 56 46 31 260 -19 30 14 25 29 11 23 30 51 16 28 35 7 - 69 0 0 29 34 17 9 56 41 30 261 -18 30 5 53 29 2 51 30 42 44 28 26 35 - 68 0 0 29 25 44 9 56 36 29 262 -17 29 57 20 28 54 18 30 34 11 28 18 1 - 67 0 0 29 17 9 9 56 31 28 262 -17 29 48 45 28 45 43 30 25 36 28 9 26 - 66 0 0 29 8 33 9 56 26 28 263 -16 29 40 8 28 37 6 30 17 0 28 0 50 - 65 0 0 28 59 55 9 56 21 27 264 -15 29 31 31 28 28 29 30 8 22 27 52 12 - 64 0 0 28 51 17 9 56 16 26 264 -14 29 22 53 28 19 51 29 59 44 27 43 34 - 63 0 0 28 42 38 9 56 12 25 265 -13 29 14 14 28 11 12 29 51 5 27 34 55 - 62 0 0 28 33 59 9 56 7 24 265 -12 29 5 34 28 2 33 29 42 26 27 26 16 - 61 0 0 28 25 19 9 56 3 23 266 -11 28 56 54 27 53 53 29 33 45 27 17 36 - 60 0 0 28 16 39 9 55 59 23 266 -11 28 48 14 27 45 12 29 25 5 27 8 56 - 59 0 0 28 7 58 9 55 55 22 267 -10 28 39 34 27 36 32 29 16 24 27 0 16 - 58 0 0 27 59 18 9 55 51 21 267 -9 28 30 53 27 27 52 29 7 44 26 51 36 - 57 0 0 27 50 38 9 55 47 20 268 -8 28 22 13 27 19 12 28 59 3 26 42 56 - 56 0 0 27 41 58 9 55 44 19 268 -7 28 13 33 27 10 32 28 50 23 26 34 16 - 55 0 0 27 33 18 9 55 41 18 269 -6 28 4 53 27 1 53 28 41 44 26 25 37 - 54 0 0 27 24 40 9 55 37 17 269 -5 27 56 15 26 53 14 28 33 5 26 16 59 - 53 0 0 27 16 2 9 55 34 16 270 -5 27 47 37 26 44 37 28 24 27 26 8 21 - 52 0 0 27 7 25 9 55 31 16 270 -4 27 39 0 26 36 0 28 15 50 25 59 45 - 51 0 0 26 58 50 9 55 28 15 271 -3 27 30 24 26 27 25 28 7 14 25 51 10 - 50 0 0 26 50 15 9 55 26 14 271 -2 27 21 50 26 18 51 27 58 39 25 42 36 - 49 0 0 26 41 43 9 55 23 13 272 -1 27 13 17 26 10 18 27 50 6 25 34 3 - 48 0 0 26 33 12 9 55 21 12 272 0 27 4 45 26 1 47 27 41 34 25 25 33 Uncertainty in time = +/- 6 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: 2UCAC 34257879 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 59 40.2366 DE: +07 24 54.230 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .037, .042 ) * V mag [mag]: 12.7 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (191) Kolga approx. diameter [km]: 101 approx. diameter ["]: .075 distance from Earth [AU]: 1.86800 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1183 number of rejected observations: 95 time covered by the observations: 1902 Jul 09 - 2012 Nov 28 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.013, 89° remarks: * orbital elements for (191) Kolga : Mean anomaly = 60.36617869 deg Arg. of pericenter = 227.91554706 deg Long. of node = 159.34229659 deg Inclination = 11.50237784 deg Eccentricity = 0.09151155 Semimajor axis = 2.89594265 AU Perihelion dist = 2.63093044 AU Mag: H = 8.90, G = 0.15 Epoch of elements : MJD 56276.42000000 TDT (2012 Dec 15.420) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 15 191 Kolga 10h 3.9m UT 12.7 6 59 40.237 7 24 54.232UCAC 34257879 0.0 13.3 101 9.6 1.868 -1.882 1.86 -130.5347 7.415 27.85 -23.29 10.0656 0.03148 0.47717 -5.94303 0.39251 -0.00202 0.00168 2000 59.082211201212 9.00000227.915547159.342297 11.5023780.09151155 2.8959427 2.6309304 9.1 5.00.15 RATE 1.9999500 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.044 0.043 360 1.58 0.043 0 0-4 0 056264.0020121215_257879 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org