IOTA/IOTA-ES occultation update for (191) Kolga / HIP 33947 event on 2012 Oct 15, 09:52 UT Visible from N Canada Summary ------- On 2012 Oct 15 UT, the 101 km diameter asteroid (191) Kolga will occult a 8.8 mag star in the constellation Monoceros for observers along a path across N Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 14.2 mag (the magnitude of the asteroid) for at most 7.6 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: . The event at a glimpse ---------------------- * Rank: 98 * date and approx. time of event: 2012 Oct 15, 09:46 - 2012 Oct 15, 09:51 UT * geocentric midpoint of event [JD]: 2456215.91122917 * magnitude of target star: 8.8 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 7.6 * Moon: 0 % sunlit, 94° distance * Sun: 96° distance * rough path description: N Canada The occultation path -------------------- * approximate projected width [km]: 142 * 1 sigma uncertainty interval [path widths]: +/- 0.37 * 1 sigma uncertainty interval [seconds]: +/- 3.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .020", 89° ) * approx speed of asteroid's shadow [km/s]: 13.3405 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 33947 by 191 Kolga on 2012 Oct 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 -178 0 0 66 32 41 9 46 33 0 65 -29 65 50 27 67 15 29 .. .. .. 67 47 32 -177 0 0 66 43 50 9 46 33 1 66 -29 66 1 46 67 26 28 65 30 59 67 58 23 -176 0 0 66 54 40 9 46 33 1 67 -29 66 12 46 67 37 7 65 42 6 68 8 54 -175 0 0 67 5 10 9 46 33 2 68 -29 66 23 26 67 47 27 65 52 53 68 19 7 -174 0 0 67 15 22 9 46 34 2 69 -29 66 33 47 67 57 29 66 3 22 68 29 1 -173 0 0 67 25 15 9 46 34 3 70 -29 66 43 50 68 7 12 66 13 31 68 38 36 -172 0 0 67 34 49 9 46 34 3 71 -29 66 53 34 68 16 36 66 23 21 68 47 53 -171 0 0 67 44 5 9 46 34 3 72 -29 67 2 59 68 25 43 66 32 53 68 56 52 -170 0 0 67 53 4 9 46 35 4 73 -29 67 12 7 68 34 32 66 42 7 69 5 34 -169 0 0 68 1 44 9 46 35 4 73 -29 67 20 56 68 43 3 66 51 3 69 13 59 -168 0 0 68 10 8 9 46 35 5 74 -29 67 29 28 68 51 18 66 59 41 69 22 6 -167 0 0 68 18 14 9 46 36 5 75 -29 67 37 43 68 59 15 67 8 2 69 29 57 -166 0 0 68 26 3 9 46 36 5 76 -29 67 45 40 69 6 56 67 16 5 69 37 31 -165 0 0 68 33 35 9 46 37 6 77 -29 67 53 21 69 14 20 67 23 52 69 44 48 -164 0 0 68 40 51 9 46 37 6 78 -29 68 0 44 69 21 27 67 31 21 69 51 50 -163 0 0 68 47 51 9 46 38 7 79 -29 68 7 52 69 28 19 67 38 34 69 58 36 -162 0 0 68 54 35 9 46 38 7 80 -29 68 14 43 69 34 55 67 45 31 70 5 6 -161 0 0 69 1 3 9 46 39 7 81 -29 68 21 18 69 41 16 67 52 11 70 11 20 -160 0 0 69 7 15 9 46 39 8 82 -29 68 27 37 69 47 21 67 58 35 70 17 20 -159 0 0 69 13 12 9 46 40 8 83 -29 68 33 41 69 53 10 68 4 43 70 23 4 -158 0 0 69 18 53 9 46 40 8 84 -29 68 39 29 69 58 45 68 10 36 70 28 34 -157 0 0 69 24 19 9 46 41 9 85 -29 68 45 1 70 4 5 68 16 13 70 33 49 -156 0 0 69 29 31 9 46 42 9 86 -29 68 50 19 70 9 10 68 21 35 70 38 49 -155 0 0 69 34 28 9 46 42 9 87 -29 68 55 21 70 14 1 68 26 42 70 43 35 -154 0 0 69 39 10 9 46 43 10 88 -29 69 0 9 70 18 37 68 31 34 70 48 7 -153 0 0 69 43 37 9 46 44 10 88 -29 69 4 42 70 23 0 68 36 10 70 52 25 -152 0 0 69 47 51 9 46 45 10 89 -29 69 9 1 70 27 8 68 40 33 70 56 30 -151 0 0 69 51 50 9 46 45 11 90 -29 69 13 5 70 31 2 68 44 40 71 0 20 -150 0 0 69 55 35 9 46 46 11 91 -29 69 16 54 70 34 42 68 48 33 71 3 57 -149 0 0 69 59 7 9 46 47 12 92 -29 69 20 30 70 38 9 68 52 12 71 7 20 -148 0 0 70 2 24 9 46 48 12 93 -29 69 23 52 70 41 23 68 55 36 71 10 31 -147 0 0 70 5 28 9 46 49 12 94 -29 69 26 59 70 44 22 68 58 47 71 13 27 -146 0 0 70 8 18 9 46 50 13 95 -29 69 29 53 70 47 9 69 1 43 71 16 11 -145 0 0 70 10 55 9 46 50 13 96 -28 69 32 33 70 49 42 69 4 26 71 18 42 -144 0 0 70 13 18 9 46 51 13 97 -28 69 34 59 70 52 2 69 6 54 71 21 0 -143 0 0 70 15 28 9 46 52 14 98 -28 69 37 12 70 54 10 69 9 9 71 23 5 -142 0 0 70 17 25 9 46 53 14 99 -28 69 39 11 70 56 4 69 11 10 71 24 57 -141 0 0 70 19 8 9 46 54 14 100 -28 69 40 57 70 57 45 69 12 57 71 26 36 -140 0 0 70 20 39 9 46 55 15 101 -28 69 42 29 70 59 13 69 14 31 71 28 3 -139 0 0 70 21 56 9 46 56 15 102 -28 69 43 48 71 0 29 69 15 51 71 29 17 -138 0 0 70 23 0 9 46 57 15 103 -28 69 44 54 71 1 31 69 16 58 71 30 18 -137 0 0 70 23 51 9 46 58 16 104 -28 69 45 46 71 2 21 69 17 51 71 31 7 -136 0 0 70 24 29 9 46 59 16 105 -28 69 46 25 71 2 58 69 18 31 71 31 44 -135 0 0 70 24 54 9 47 0 16 106 -28 69 46 51 71 3 23 69 18 57 71 32 8 -134 0 0 70 25 7 9 47 2 16 107 -27 69 47 4 71 3 34 69 19 10 71 32 19 -133 0 0 70 25 6 9 47 3 17 108 -27 69 47 3 71 3 33 69 19 10 71 32 18 -132 0 0 70 24 52 9 47 4 17 109 -27 69 46 49 71 3 20 69 18 56 71 32 4 -131 0 0 70 24 25 9 47 5 17 110 -27 69 46 22 71 2 53 69 18 28 71 31 38 -130 0 0 70 23 45 9 47 6 18 111 -27 69 45 42 71 2 14 69 17 48 71 31 0 -129 0 0 70 22 53 9 47 8 18 112 -27 69 44 48 71 1 22 69 16 53 71 30 8 -128 0 0 70 21 47 9 47 9 18 113 -27 69 43 41 71 0 18 69 15 45 71 29 5 -127 0 0 70 20 28 9 47 10 19 114 -27 69 42 21 70 59 0 69 14 24 71 27 48 -126 0 0 70 18 55 9 47 11 19 115 -27 69 40 47 70 57 30 69 12 49 71 26 19 -125 0 0 70 17 10 9 47 13 19 116 -26 69 39 0 70 55 46 69 11 0 71 24 37 -124 0 0 70 15 11 9 47 14 20 117 -26 69 36 59 70 53 50 69 8 58 71 22 43 -123 0 0 70 12 59 9 47 15 20 118 -26 69 34 44 70 51 40 69 6 42 71 20 35 -122 0 0 70 10 34 9 47 17 20 119 -26 69 32 16 70 49 18 69 4 12 71 18 15 -121 0 0 70 7 55 9 47 18 21 120 -26 69 29 34 70 46 42 69 1 28 71 15 41 -120 0 0 70 5 3 9 47 20 21 121 -26 69 26 38 70 43 53 68 58 29 71 12 55 -119 0 0 70 1 56 9 47 21 21 122 -26 69 23 29 70 40 50 68 55 17 71 9 55 -118 0 0 69 58 36 9 47 23 22 123 -25 69 20 5 70 37 34 68 51 51 71 6 41 -117 0 0 69 55 2 9 47 24 22 124 -25 69 16 27 70 34 4 68 48 10 71 3 15 -116 0 0 69 51 14 9 47 26 22 125 -25 69 12 34 70 30 20 68 44 14 70 59 35 -115 0 0 69 47 12 9 47 27 23 126 -25 69 8 28 70 26 23 68 40 4 70 55 41 -114 0 0 69 42 55 9 47 29 23 127 -25 69 4 6 70 22 11 68 35 39 70 51 33 -113 0 0 69 38 24 9 47 31 23 128 -25 68 59 30 70 17 45 68 31 0 70 47 11 -112 0 0 69 33 38 9 47 32 24 129 -24 68 54 39 70 13 5 68 26 5 70 42 35 -111 0 0 69 28 38 9 47 34 24 130 -24 68 49 33 70 8 10 68 20 55 70 37 44 -110 0 0 69 23 22 9 47 36 24 131 -24 68 44 12 70 3 1 68 15 29 70 32 39 -109 0 0 69 17 52 9 47 38 25 132 -24 68 38 35 69 57 36 68 9 48 70 27 20 -108 0 0 69 12 6 9 47 39 25 133 -24 68 32 43 69 51 57 68 3 51 70 21 45 -107 0 0 69 6 4 9 47 41 25 134 -23 68 26 35 69 46 2 67 57 39 70 15 56 -106 0 0 68 59 47 9 47 43 26 135 -23 68 20 10 69 39 52 67 51 10 70 9 51 -105 0 0 68 53 14 9 47 45 26 136 -23 68 13 30 69 33 26 67 44 24 70 3 30 -104 0 0 68 46 24 9 47 47 26 137 -23 68 6 33 69 26 44 67 37 22 69 56 54 -103 0 0 68 39 18 9 47 49 27 138 -23 67 59 20 69 19 46 67 30 4 69 50 2 -102 0 0 68 31 56 9 47 51 27 139 -22 67 51 50 69 12 31 67 22 28 69 42 53 -101 0 0 68 24 16 9 47 53 27 140 -22 67 44 3 69 5 0 67 14 35 69 35 29 -100 0 0 68 16 20 9 47 55 28 141 -22 67 35 58 68 57 12 67 6 24 69 27 47 - 99 0 0 68 8 6 9 47 57 28 142 -22 67 27 36 68 49 7 66 57 56 69 19 48 - 98 0 0 67 59 34 9 48 0 28 143 -21 67 18 56 68 40 44 66 49 10 69 11 33 - 97 0 0 67 50 45 9 48 2 29 144 -21 67 9 57 68 32 4 66 40 5 69 2 59 - 96 0 0 67 41 37 9 48 4 29 145 -21 67 0 41 68 23 5 66 30 42 68 54 8 - 95 0 0 67 32 11 9 48 7 29 146 -21 66 51 5 68 13 49 66 21 0 68 44 59 - 94 0 0 67 22 26 9 48 9 30 147 -20 66 41 11 68 4 14 66 10 59 68 35 31 - 93 0 0 67 12 22 9 48 12 30 148 -20 66 30 57 67 54 19 66 0 39 68 25 44 - 92 0 0 67 1 59 9 48 14 30 149 -20 66 20 24 67 44 6 65 49 58 68 15 39 - 91 0 0 66 51 16 9 48 17 31 150 -20 66 9 31 67 33 33 65 38 58 68 5 14 - 90 0 0 66 40 13 9 48 19 31 152 -19 65 58 18 67 22 41 65 27 38 67 54 29 - 89 0 0 66 28 49 9 48 22 31 153 -19 65 46 44 67 11 28 65 15 57 67 43 25 - 88 0 0 66 17 5 9 48 25 32 154 -19 65 34 50 66 59 55 65 3 55 67 32 0 - 87 0 0 66 5 0 9 48 28 32 155 -18 65 22 35 66 48 1 64 51 32 67 20 14 - 86 0 0 65 52 34 9 48 31 32 156 -18 65 9 58 66 35 46 64 38 48 67 8 8 - 85 0 0 65 39 46 9 48 34 33 157 -18 64 56 59 66 23 9 64 25 42 66 55 40 - 84 0 0 65 26 36 9 48 37 33 158 -17 64 43 39 66 10 11 64 12 13 66 42 50 - 83 0 0 65 13 4 9 48 40 34 159 -17 64 29 56 65 56 50 63 58 22 66 29 38 - 82 0 0 64 59 10 9 48 43 34 160 -17 64 15 50 65 43 7 63 44 9 66 16 4 - 81 0 0 64 44 52 9 48 46 34 162 -16 64 1 21 65 29 1 63 29 32 66 2 6 - 80 0 0 64 30 12 9 48 50 35 163 -16 63 46 30 65 14 32 63 14 33 65 47 46 - 79 0 0 64 15 7 9 48 53 35 164 -16 63 31 14 64 59 39 62 59 9 65 33 3 - 78 0 0 63 59 39 9 48 56 35 165 -15 63 15 35 64 44 23 62 43 22 65 17 55 - 77 0 0 63 43 47 9 49 0 36 166 -15 62 59 31 64 28 42 62 27 10 65 2 23 - 76 0 0 63 27 30 9 49 4 36 167 -15 62 43 3 64 12 37 62 10 34 64 46 27 - 75 0 0 63 10 48 9 49 7 37 169 -14 62 26 10 63 56 7 61 53 34 64 30 6 - 74 0 0 62 53 42 9 49 11 37 170 -14 62 8 53 63 39 12 61 36 8 64 13 20 - 73 0 0 62 36 10 9 49 15 37 171 -13 61 51 10 63 21 52 61 18 17 63 56 9 - 72 0 0 62 18 12 9 49 19 38 172 -13 61 33 1 63 4 5 61 0 1 63 38 31 - 71 0 0 61 59 49 9 49 23 38 174 -12 61 14 27 62 45 53 60 41 18 63 20 28 - 70 0 0 61 40 59 9 49 27 38 175 -12 60 55 27 62 27 15 60 22 11 63 1 58 - 69 0 0 61 21 44 9 49 32 39 176 -11 60 36 0 62 8 11 60 2 37 62 43 2 - 68 0 0 61 2 2 9 49 36 39 177 -11 60 16 8 61 48 39 59 42 36 62 23 40 - 67 0 0 60 41 53 9 49 40 39 179 -11 59 55 48 61 28 41 59 22 10 62 3 50 - 66 0 0 60 21 17 9 49 45 40 180 -10 59 35 3 61 8 16 59 1 17 61 43 33 - 65 0 0 60 0 15 9 49 50 40 181 -10 59 13 50 60 47 24 58 39 58 61 22 49 - 64 0 0 59 38 45 9 49 54 40 183 -9 58 52 11 60 26 5 58 18 12 61 1 37 - 63 0 0 59 16 49 9 49 59 41 184 -8 58 30 6 60 4 18 57 55 59 60 39 58 - 62 0 0 58 54 25 9 50 4 41 185 -8 58 7 33 59 42 4 57 33 20 60 17 52 - 61 0 0 58 31 35 9 50 9 41 187 -7 57 44 34 59 19 23 57 10 15 59 55 17 - 60 0 0 58 8 17 9 50 14 42 188 -7 57 21 8 58 56 14 56 46 43 59 32 16 - 59 0 0 57 44 33 9 50 20 42 189 -6 56 57 15 58 32 38 56 22 44 59 8 46 - 58 0 0 57 20 22 9 50 25 42 191 -6 56 32 56 58 8 35 55 58 20 58 44 49 - 57 0 0 56 55 44 9 50 30 43 192 -5 56 8 11 57 44 5 55 33 29 58 20 25 - 56 0 0 56 30 39 9 50 36 43 194 -4 55 43 0 57 19 8 55 8 13 57 55 34 - 55 0 0 56 5 9 9 50 42 43 195 -4 55 17 23 56 53 44 54 42 32 57 30 15 - 54 0 0 55 39 12 9 50 48 43 197 -3 54 51 20 56 27 54 54 16 25 57 4 30 - 53 0 0 55 12 51 9 50 53 44 198 -2 54 24 53 56 1 38 53 49 53 56 38 19 - 52 0 0 54 46 4 9 50 59 44 200 -2 53 58 0 55 34 57 53 22 57 56 11 41 - 51 0 0 54 18 52 9 51 6 44 201 -1 53 30 44 55 7 50 52 55 38 55 44 38 - 50 0 0 53 51 16 9 51 12 44 203 0 53 3 4 54 40 18 52 27 55 55 17 10 Uncertainty in time = +/- 4 secs Prediction of 2012 Jul 10.0 Data for the target star ------------------------ * name: HIP 33947 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 02 39.7583 DE: +10 04 58.190 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .020, .017 ) * V mag [mag]: 8.8 * B mag [mag]: 9.6 * Apparent position with proper motion RA(deg): 105.8461820101 DE(deg): 10.0630541678 * Equation of equinoxes (radians) : 0.000059693530339 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (191) Kolga approx. diameter [km]: 101 approx. diameter ["]: .057 distance from Earth [AU]: 2.43900 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 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): 0.018, 0.010, 88° remarks: * orbital elements for (191) Kolga : Mean anomaly = 48.01543571 deg Arg. of pericenter = 228.06080886 deg Long. of node = 159.35862251 deg Inclination = 11.50113199 deg Eccentricity = 0.09156000 Semimajor axis = 2.89666792 AU Perihelion dist = 2.63144900 AU Mag: H = 8.90, G = 0.15 Epoch of elements : MJD 56215.41100000 TDT (2012 Oct 15.411) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 15 191 Kolga 9h 52.2m UT 8.8 7 2 39.758 10 4 58.19HIP 33947 9.6 14.2 101 7.6 2.439 1.682 -10.93 -66.7118 10.087 28.39 -8.74 9.8695 0.27763 0.64320 6.89323 -3.02987 -0.00572 0.00078 2000 46.93366920121010.00000228.060809159.358623 11.5011320.09156000 2.8966679 2.6314490 9.1 5.00.15 RATE 1.9991990 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.027 0.020 89 1.37 0.021 0 0 3 0 056118.0020121015__33947 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 26, 04:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org