IOTA/IOTA-ES occultation update for (191) Kolga / TYC 0751-01355-1 event on 2012 Oct 02, 08:25 UT Visible from E Canada, W USA Summary ------- On 2012 Oct 02 UT, the 101 km diameter asteroid (191) Kolga will occult a 11.4 mag star in the constellation Monoceros for observers along a path across E Canada, W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.1 mag to 14.4 mag (the magnitude of the asteroid) for at most 5.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 90 * date and approx. time of event: 2012 Oct 02, 08:20 - 2012 Oct 02, 08:24 UT * geocentric midpoint of event [JD]: 2456202.85085 * magnitude of target star: 11.4 * magnitude drop [mag]: 3.1 * estimated maximum duration [s]: 5.5 * Moon: 95 % sunlit, 70° distance * Sun: 86° distance * rough path description: E Canada, W USA The occultation path -------------------- * approximate projected width [km]: 113 * 1 sigma uncertainty interval [path widths]: +/- 0.52 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .026", 90° ) * approx speed of asteroid's shadow [km/s]: 18.5069 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0751-01355-1 by 191 Kolga on 2012 Oct 2 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 43 39 33 8 20 7 1 75 -50 43 7 52 44 11 23 42 35 4 44 44 39 -132 0 0 43 51 4 8 20 7 1 76 -50 43 19 26 44 22 51 42 46 42 44 56 5 -131 0 0 44 2 19 8 20 7 2 77 -50 43 30 43 44 34 3 42 58 2 45 7 13 -130 0 0 44 13 16 8 20 7 3 77 -50 43 41 43 44 44 57 43 9 4 45 18 5 -129 0 0 44 23 56 8 20 8 4 78 -49 43 52 26 44 55 34 43 19 50 45 28 39 -128 0 0 44 34 18 8 20 8 4 79 -49 44 2 51 45 5 54 43 30 18 45 38 56 -127 0 0 44 44 23 8 20 8 5 80 -49 44 12 59 45 15 57 43 40 28 45 48 55 -126 0 0 44 54 11 8 20 9 6 80 -49 44 22 50 45 25 42 43 50 22 45 58 38 -125 0 0 45 3 42 8 20 9 7 81 -49 44 32 23 45 35 10 43 59 58 46 8 3 -124 0 0 45 12 55 8 20 10 7 82 -49 44 41 39 45 44 21 44 9 16 46 17 11 -123 0 0 45 21 51 8 20 11 8 82 -48 44 50 37 45 53 14 44 18 17 46 26 2 -122 0 0 45 30 30 8 20 11 9 83 -48 44 59 18 46 1 50 44 27 1 46 34 35 -121 0 0 45 38 51 8 20 12 9 84 -48 45 7 42 46 10 9 44 35 27 46 42 52 -120 0 0 45 46 56 8 20 13 10 85 -48 45 15 49 46 18 11 44 43 36 46 50 51 -119 0 0 45 54 42 8 20 14 11 85 -47 45 23 38 46 25 56 44 51 28 46 58 33 -118 0 0 46 2 12 8 20 15 12 86 -47 45 31 10 46 33 23 44 59 2 47 5 58 -117 0 0 46 9 24 8 20 16 12 87 -47 45 38 24 46 40 33 45 6 18 47 13 6 -116 0 0 46 16 19 8 20 17 13 87 -46 45 45 21 46 47 26 45 13 18 47 19 57 -115 0 0 46 22 57 8 20 18 14 88 -46 45 52 1 46 54 2 45 19 59 47 26 30 -114 0 0 46 29 18 8 20 19 14 89 -46 45 58 24 47 0 20 45 26 24 47 32 47 -113 0 0 46 35 21 8 20 20 15 90 -45 46 4 29 47 6 22 45 32 31 47 38 46 -112 0 0 46 41 7 8 20 21 16 90 -45 46 10 17 47 12 6 45 38 21 47 44 28 -111 0 0 46 46 36 8 20 23 16 91 -45 46 15 47 47 17 33 45 43 53 47 49 54 -110 0 0 46 51 48 8 20 24 17 92 -44 46 21 1 47 22 43 45 49 9 47 55 2 -109 0 0 46 56 42 8 20 25 18 93 -44 46 25 57 47 27 36 45 54 6 47 59 53 -108 0 0 47 1 20 8 20 27 18 94 -44 46 30 36 47 32 12 45 58 47 48 4 28 -107 0 0 47 5 40 8 20 28 19 94 -43 46 34 58 47 36 31 46 3 10 48 8 45 -106 0 0 47 9 44 8 20 30 20 95 -43 46 39 2 47 40 33 46 7 16 48 12 45 -105 0 0 47 13 30 8 20 32 20 96 -42 46 42 50 47 44 18 46 11 5 48 16 29 -104 0 0 47 16 59 8 20 33 21 97 -42 46 46 20 47 47 46 46 14 36 48 19 56 -103 0 0 47 20 11 8 20 35 22 97 -42 46 49 33 47 50 56 46 17 50 48 23 5 -102 0 0 47 23 5 8 20 37 22 98 -41 46 52 29 47 53 50 46 20 47 48 25 58 -101 0 0 47 25 43 8 20 38 23 99 -41 46 55 7 47 56 27 46 23 27 48 28 34 -100 0 0 47 28 4 8 20 40 24 100 -40 46 57 29 47 58 47 46 25 49 48 30 53 - 99 0 0 47 30 8 8 20 42 24 101 -40 46 59 33 48 0 50 46 27 54 48 32 55 - 98 0 0 47 31 54 8 20 44 25 101 -39 47 1 21 48 2 36 46 29 42 48 34 40 - 97 0 0 47 33 24 8 20 46 26 102 -39 47 2 51 48 4 5 46 31 13 48 36 8 - 96 0 0 47 34 36 8 20 48 26 103 -38 47 4 4 48 5 17 46 32 26 48 37 20 - 95 0 0 47 35 31 8 20 50 27 104 -38 47 4 59 48 6 12 46 33 22 48 38 14 - 94 0 0 47 36 10 8 20 52 28 105 -37 47 5 38 48 6 50 46 34 1 48 38 52 - 93 0 0 47 36 31 8 20 54 28 106 -37 47 5 59 48 7 11 46 34 23 48 39 13 - 92 0 0 47 36 35 8 20 57 29 106 -36 47 6 4 48 7 15 46 34 27 48 39 17 - 91 0 0 47 36 22 8 20 59 30 107 -36 47 5 51 48 7 2 46 34 15 48 39 4 - 90 0 0 47 35 52 8 21 1 30 108 -35 47 5 21 48 6 32 46 33 44 48 38 34 - 89 0 0 47 35 5 8 21 4 31 109 -35 47 4 33 48 5 45 46 32 57 48 37 47 - 88 0 0 47 34 1 8 21 6 32 110 -34 47 3 29 48 4 41 46 31 52 48 36 44 - 87 0 0 47 32 40 8 21 8 32 111 -34 47 2 7 48 3 20 46 30 30 48 35 23 - 86 0 0 47 31 1 8 21 11 33 112 -33 47 0 28 48 1 42 46 28 51 48 33 45 - 85 0 0 47 29 5 8 21 13 34 113 -33 46 58 32 47 59 47 46 26 54 48 31 51 - 84 0 0 47 26 52 8 21 16 34 113 -32 46 56 18 47 57 34 46 24 39 48 29 39 - 83 0 0 47 24 22 8 21 19 35 114 -32 46 53 47 47 55 5 46 22 8 48 27 11 - 82 0 0 47 21 35 8 21 21 36 115 -31 46 50 59 47 52 18 46 19 19 48 24 25 - 81 0 0 47 18 30 8 21 24 36 116 -31 46 47 53 47 49 15 46 16 12 48 21 22 - 80 0 0 47 15 8 8 21 27 37 117 -30 46 44 30 47 45 53 46 12 48 48 18 2 - 79 0 0 47 11 28 8 21 30 37 118 -30 46 40 50 47 42 15 46 9 6 48 14 25 - 78 0 0 47 7 32 8 21 33 38 119 -29 46 36 52 47 38 20 46 5 7 48 10 31 - 77 0 0 47 3 18 8 21 35 39 120 -28 46 32 37 47 34 7 46 0 51 48 6 19 - 76 0 0 46 58 46 8 21 38 39 121 -28 46 28 4 47 29 37 45 56 16 48 1 50 - 75 0 0 46 53 57 8 21 41 40 122 -27 46 23 13 47 24 49 45 51 24 47 57 4 - 74 0 0 46 48 50 8 21 44 41 123 -27 46 18 5 47 19 44 45 46 15 47 52 1 - 73 0 0 46 43 26 8 21 48 41 124 -26 46 12 39 47 14 21 45 40 47 47 46 40 - 72 0 0 46 37 45 8 21 51 42 125 -25 46 6 56 47 8 41 45 35 2 47 41 2 - 71 0 0 46 31 45 8 21 54 43 126 -25 46 0 55 47 2 44 45 28 59 47 35 6 - 70 0 0 46 25 28 8 21 57 43 127 -24 45 54 36 46 56 29 45 22 39 47 28 53 - 69 0 0 46 18 54 8 22 0 44 128 -24 45 48 0 46 49 56 45 16 0 47 22 22 - 68 0 0 46 12 1 8 22 4 44 129 -23 45 41 5 46 43 6 45 9 4 47 15 34 - 67 0 0 46 4 51 8 22 7 45 130 -22 45 33 53 46 35 58 45 1 49 47 8 28 - 66 0 0 45 57 23 8 22 11 46 131 -22 45 26 23 46 28 32 44 54 17 47 1 5 - 65 0 0 45 49 37 8 22 14 46 132 -21 45 18 35 46 20 48 44 46 27 46 53 24 - 64 0 0 45 41 34 8 22 18 47 134 -20 45 10 29 46 12 47 44 38 18 46 45 25 - 63 0 0 45 33 12 8 22 21 47 135 -20 45 2 5 46 4 28 44 29 52 46 37 8 - 62 0 0 45 24 33 8 22 25 48 136 -19 44 53 23 45 55 51 44 21 7 46 28 34 - 61 0 0 45 15 35 8 22 29 49 137 -19 44 44 23 45 46 56 44 12 5 46 19 41 - 60 0 0 45 6 19 8 22 32 49 138 -18 44 35 5 45 37 43 44 2 44 46 10 31 - 59 0 0 44 56 46 8 22 36 50 140 -17 44 25 29 45 28 12 43 53 5 46 1 3 - 58 0 0 44 46 54 8 22 40 50 141 -17 44 15 34 45 18 23 43 43 8 45 51 17 - 57 0 0 44 36 45 8 22 44 51 142 -16 44 5 22 45 8 16 43 32 53 45 41 13 - 56 0 0 44 26 17 8 22 48 52 143 -15 43 54 52 44 57 51 43 22 20 45 30 51 - 55 0 0 44 15 31 8 22 52 52 145 -14 43 44 3 44 47 8 43 11 28 45 20 11 - 54 0 0 44 4 27 8 22 56 53 146 -14 43 32 56 44 36 7 43 0 19 45 9 13 - 53 0 0 43 53 5 8 23 0 53 147 -13 43 21 31 44 24 48 42 48 51 44 57 57 - 52 0 0 43 41 25 8 23 4 54 149 -12 43 9 48 44 13 11 42 37 4 44 46 23 - 51 0 0 43 29 26 8 23 8 54 150 -12 42 57 47 44 1 15 42 25 0 44 34 30 - 50 0 0 43 17 10 8 23 12 55 152 -11 42 45 27 43 49 2 42 12 38 44 22 20 - 49 0 0 43 4 35 8 23 17 55 153 -10 42 32 50 43 36 30 41 59 57 44 9 52 - 48 0 0 42 51 43 8 23 21 56 155 -10 42 19 54 43 23 41 41 46 58 43 57 6 - 47 0 0 42 38 32 8 23 25 56 156 -9 42 6 40 43 10 33 41 33 41 43 44 1 - 46 0 0 42 25 3 8 23 30 57 158 -8 41 53 8 42 57 8 41 20 6 43 30 39 - 45 0 0 42 11 17 8 23 34 57 160 -7 41 39 18 42 43 24 41 6 13 43 16 59 - 44 0 0 41 57 12 8 23 39 58 161 -7 41 25 11 42 29 23 40 52 2 43 3 1 - 43 0 0 41 42 49 8 23 43 58 163 -6 41 10 45 42 15 3 40 37 33 42 48 45 - 42 0 0 41 28 9 8 23 48 59 165 -5 40 56 2 42 0 26 40 22 47 42 34 11 - 41 0 0 41 13 11 8 23 53 59 167 -4 40 41 1 41 45 31 40 7 42 42 19 20 - 40 0 0 40 57 56 8 23 57 60 169 -3 40 25 42 41 30 19 39 52 20 42 4 10 - 39 0 0 40 42 22 8 24 2 60 171 -3 40 10 5 41 14 49 39 36 41 41 48 44 - 38 0 0 40 26 32 8 24 7 60 172 -2 39 54 12 40 59 1 39 20 44 41 32 59 - 37 0 0 40 10 24 8 24 12 61 174 -1 39 38 1 40 42 56 39 4 30 41 16 58 - 36 0 0 39 53 58 8 24 17 61 177 0 39 21 32 40 26 34 38 47 58 41 0 39 Uncertainty in time = +/- 4 secs Prediction of 2012 Aug 6.0 Data for the target star ------------------------ * name: TYC 0751-01355-1 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 52 13.9222 DE: +11 01 41.284 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .036, .024 ) * V mag [mag]: 11.4 * B mag [mag]: 12.2 * Apparent position with proper motion RA(deg): 103.2385285484 DE(deg): 11.0116724880 * Equation of equinoxes (radians) : 0.000062602264041 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (191) Kolga approx. diameter [km]: 101 approx. diameter ["]: .054 distance from Earth [AU]: 2.59800 * orbital information: orbit source: Preston date of fit: 2012 Jul 09 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1164 number of rejected observations: 95 time covered by the observations: 1902 Jul 09 - 2012 Jan 04 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.010, 88° remarks: * orbital elements for (191) Kolga : Mean anomaly = 45.37485547 deg Arg. of pericenter = 228.08923775 deg Long. of node = 159.36285203 deg Inclination = 11.50093710 deg Eccentricity = 0.09156793 Semimajor axis = 2.89680194 AU Perihelion dist = 2.63154779 AU Mag: H = 8.90, G = 0.15 Epoch of elements : MJD 56202.35100000 TDT (2012 Oct 02.351) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 2 191 Kolga 8h 25.2m UT 11.4 6 52 13.922 11 1 41.28TYC 0751-01355-1 12.2 14.4 101 5.5 2.598 2.290 -10.64 -34.7100 11.031 51.01 -3.78 8.4204 0.13447 0.42997 9.96199 -3.14230 -0.00566 0.00044 2000 44.9048762012 930.00000228.089238159.362852 11.5009370.09156793 2.8968019 2.6315478 9.1 5.00.15 RATE 1.9990600 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.026 90 1.52 0.028 0 0 2 4 056145.0020121002_1355-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 06, 17:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org