IOTA/IOTA-ES occultation update for (67) Asia / 2UCAC 27006170 event on 2012 Oct 26, 11:46 UT Visible from Japan, China Summary ------- On 2012 Oct 26 UT, the 62 km diameter asteroid (67) Asia will occult a 12.2 mag star in the constellation Capricornus for observers along a path across Japan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.8 mag to 12.2 mag (the magnitude of the asteroid) for at most 3.1 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: 85 * date and approx. time of event: 2012 Oct 26, 11:41 - 2012 Oct 26, 11:46 UT * geocentric midpoint of event [JD]: 2456226.98806667 * magnitude of target star: 12.2 * magnitude drop [mag]: 0.8 * estimated maximum duration [s]: 3.1 * Moon: 89 % sunlit, 49° distance * Sun: 93° distance * rough path description: Japan, China The occultation path -------------------- * approximate projected width [km]: 88 * 1 sigma uncertainty interval [path widths]: +/- 0.61 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .072 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .072", .030", 90° ) * approx speed of asteroid's shadow [km/s]: 19.6360 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 27006170 by 67 Asia on 2012 Oct 26 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 83 0 0 31 18 47 11 41 58 43 161 0 30 54 55 31 42 48 30 26 2 32 12 21 84 0 0 31 20 9 11 42 3 44 163 -1 30 56 17 31 44 11 30 27 23 32 13 44 85 0 0 31 21 50 11 42 8 44 164 -2 30 57 58 31 45 53 30 29 4 32 15 26 86 0 0 31 23 52 11 42 13 44 165 -3 30 59 59 31 47 54 30 31 5 32 17 28 87 0 0 31 26 13 11 42 18 44 167 -4 31 2 20 31 50 16 30 33 25 32 19 50 88 0 0 31 28 53 11 42 23 44 168 -5 31 5 0 31 52 56 30 36 4 32 22 32 89 0 0 31 31 53 11 42 28 44 169 -5 31 7 59 31 55 57 30 39 3 32 25 32 90 0 0 31 35 12 11 42 33 44 171 -6 31 11 17 31 59 16 30 42 21 32 28 53 91 0 0 31 38 50 11 42 38 45 172 -7 31 14 55 32 2 55 30 45 58 32 32 33 92 0 0 31 42 48 11 42 43 45 174 -8 31 18 52 32 6 54 30 49 54 32 36 32 93 0 0 31 47 5 11 42 47 45 175 -9 31 23 8 32 11 11 30 54 9 32 40 50 94 0 0 31 51 40 11 42 52 45 176 -10 31 27 43 32 15 48 30 58 44 32 45 28 95 0 0 31 56 35 11 42 57 45 178 -11 31 32 37 32 20 43 31 3 36 32 50 24 96 0 0 32 1 49 11 43 2 45 179 -11 31 37 50 32 25 58 31 8 48 32 55 40 97 0 0 32 7 21 11 43 7 44 181 -12 31 43 21 32 31 31 31 14 18 33 1 14 98 0 0 32 13 11 11 43 12 44 182 -13 31 49 11 32 37 22 31 20 7 33 7 6 99 0 0 32 19 20 11 43 17 44 183 -14 31 55 19 32 43 32 31 26 14 33 13 18 100 0 0 32 25 48 11 43 22 44 185 -15 32 1 45 32 50 0 31 32 39 33 19 47 101 0 0 32 32 33 11 43 27 44 186 -16 32 8 29 32 56 47 31 39 22 33 26 35 102 0 0 32 39 36 11 43 32 44 187 -17 32 15 32 33 3 51 31 46 23 33 33 41 103 0 0 32 46 57 11 43 36 43 189 -18 32 22 51 33 11 13 31 53 41 33 41 4 104 0 0 32 54 36 11 43 41 43 190 -18 32 30 29 33 18 53 32 1 17 33 48 46 105 0 0 33 2 32 11 43 46 43 191 -19 32 38 24 33 26 50 32 9 11 33 56 44 106 0 0 33 10 45 11 43 51 42 193 -20 32 46 35 33 35 4 32 17 21 34 5 0 107 0 0 33 19 15 11 43 55 42 194 -21 32 55 4 33 43 36 32 25 48 34 13 33 108 0 0 33 28 1 11 44 0 42 195 -22 33 3 50 33 52 24 32 34 32 34 22 23 109 0 0 33 37 5 11 44 5 41 196 -23 33 12 51 34 1 28 32 43 32 34 31 29 110 0 0 33 46 24 11 44 9 41 198 -24 33 22 10 34 10 49 32 52 49 34 40 52 111 0 0 33 56 0 11 44 14 41 199 -24 33 31 44 34 20 26 33 2 21 34 50 30 112 0 0 34 5 51 11 44 18 40 200 -25 33 41 34 34 30 19 33 12 10 35 0 25 113 0 0 34 15 58 11 44 23 40 201 -26 33 51 39 34 40 27 33 22 13 35 10 35 114 0 0 34 26 20 11 44 27 39 203 -27 34 2 0 34 50 51 33 32 32 35 21 0 115 0 0 34 36 57 11 44 32 39 204 -28 34 12 35 35 1 29 33 43 6 35 31 41 116 0 0 34 47 49 11 44 36 38 205 -29 34 23 26 35 12 23 33 53 55 35 42 36 117 0 0 34 58 55 11 44 40 38 206 -29 34 34 30 35 23 30 34 4 58 35 53 46 118 0 0 35 10 15 11 44 44 37 207 -30 34 45 49 35 34 52 34 16 15 36 5 10 119 0 0 35 21 49 11 44 48 37 208 -31 34 57 22 35 46 28 34 27 45 36 16 47 120 0 0 35 33 37 11 44 52 36 209 -32 35 9 8 35 58 17 34 39 30 36 28 38 121 0 0 35 45 38 11 44 56 35 210 -33 35 21 7 36 10 20 34 51 27 36 40 43 122 0 0 35 57 52 11 45 0 35 211 -33 35 33 19 36 22 35 35 3 38 36 53 0 123 0 0 36 10 18 11 45 4 34 212 -34 35 45 44 36 35 3 35 16 1 37 5 30 124 0 0 36 22 57 11 45 8 34 213 -35 35 58 21 36 47 43 35 28 36 37 18 12 125 0 0 36 35 47 11 45 12 33 214 -36 36 11 10 37 0 35 35 41 23 37 31 6 126 0 0 36 48 49 11 45 16 32 215 -36 36 24 11 37 13 39 35 54 21 37 44 12 127 0 0 37 2 2 11 45 19 32 216 -37 36 37 22 37 26 54 36 7 31 37 57 29 128 0 0 37 15 26 11 45 23 31 217 -38 36 50 44 37 40 19 36 20 51 38 10 56 129 0 0 37 29 1 11 45 26 30 218 -39 37 4 17 37 53 55 36 34 22 38 24 34 130 0 0 37 42 45 11 45 30 30 219 -39 37 18 0 38 7 41 36 48 4 38 38 23 131 0 0 37 56 39 11 45 33 29 220 -40 37 31 53 38 21 37 37 1 54 38 52 20 132 0 0 38 10 43 11 45 36 28 221 -41 37 45 55 38 35 42 37 15 55 39 6 27 133 0 0 38 24 56 11 45 39 28 221 -41 38 0 6 38 49 56 37 30 4 39 20 43 134 0 0 38 39 17 11 45 42 27 222 -42 38 14 26 39 4 19 37 44 22 39 35 8 135 0 0 38 53 46 11 45 45 26 223 -43 38 28 54 39 18 50 37 58 48 39 49 41 136 0 0 39 8 23 11 45 48 25 224 -43 38 43 29 39 33 29 38 13 22 40 4 21 137 0 0 39 23 8 11 45 51 25 225 -44 38 58 12 39 48 15 38 28 3 40 19 9 138 0 0 39 37 59 11 45 54 24 226 -45 39 13 3 40 3 8 38 42 52 40 34 4 139 0 0 39 52 57 11 45 56 23 226 -45 39 27 59 40 18 7 38 57 47 40 49 5 140 0 0 40 8 2 11 45 59 23 227 -46 39 43 2 40 33 13 39 12 48 41 4 13 141 0 0 40 23 12 11 46 1 22 228 -46 39 58 11 40 48 24 39 27 56 41 19 26 142 0 0 40 38 27 11 46 4 21 229 -47 40 13 25 41 3 41 39 43 8 41 34 44 143 0 0 40 53 48 11 46 6 20 230 -47 40 28 45 41 19 3 39 58 26 41 50 8 144 0 0 41 9 13 11 46 8 20 230 -48 40 44 9 41 34 30 40 13 49 42 5 36 145 0 0 41 24 43 11 46 10 19 231 -48 40 59 37 41 50 0 40 29 15 42 21 8 146 0 0 41 40 16 11 46 12 18 232 -49 41 15 9 42 5 34 40 44 46 42 36 44 147 0 0 41 55 52 11 46 14 17 233 -49 41 30 44 42 21 12 41 0 20 42 52 23 148 0 0 42 11 32 11 46 16 17 233 -50 41 46 23 42 36 53 41 15 57 43 8 5 149 0 0 42 27 14 11 46 18 16 234 -50 42 2 4 42 52 36 41 31 37 43 23 49 150 0 0 42 42 58 11 46 20 15 235 -51 42 17 47 43 8 21 41 47 19 43 39 36 151 0 0 42 58 44 11 46 21 14 236 -51 42 33 32 43 24 8 42 3 3 43 55 24 152 0 0 43 14 31 11 46 23 14 236 -51 42 49 19 43 39 56 42 18 49 44 11 13 153 0 0 43 30 20 11 46 24 13 237 -52 43 5 6 43 55 45 42 34 36 44 27 3 154 0 0 43 46 9 11 46 26 12 238 -52 43 20 55 44 11 35 42 50 23 44 42 54 155 0 0 44 1 58 11 46 27 11 238 -52 43 36 43 44 27 25 43 6 11 44 58 45 156 0 0 44 17 47 11 46 28 11 239 -53 43 52 31 44 43 15 43 21 58 45 14 35 157 0 0 44 33 35 11 46 29 10 240 -53 44 8 19 44 59 4 43 37 45 45 30 25 158 0 0 44 49 23 11 46 30 9 241 -53 44 24 6 45 14 52 43 53 32 45 46 14 159 0 0 45 5 9 11 46 31 8 241 -53 44 39 52 45 30 39 44 9 17 46 2 1 160 0 0 45 20 54 11 46 32 8 242 -53 44 55 36 45 46 24 44 25 0 46 17 47 161 0 0 45 36 36 11 46 33 7 243 -54 45 11 18 46 2 7 44 40 42 46 33 30 162 0 0 45 52 16 11 46 33 6 244 -54 45 26 58 46 17 47 44 56 21 46 49 11 163 0 0 46 7 54 11 46 34 5 244 -54 45 42 35 46 33 25 45 11 58 47 4 49 164 0 0 46 23 28 11 46 34 5 245 -54 45 58 9 46 48 59 45 27 32 47 20 24 165 0 0 46 38 59 11 46 35 4 246 -54 46 13 40 47 4 30 45 43 3 47 35 55 166 0 0 46 54 26 11 46 35 3 246 -54 46 29 7 47 19 57 45 58 30 47 51 23 167 0 0 47 9 49 11 46 35 2 247 -54 46 44 30 47 35 21 46 13 53 48 6 46 168 0 0 47 25 8 11 46 36 2 248 -54 46 59 49 47 50 39 .. .. .. 48 22 4 169 0 0 47 40 22 11 46 36 1 249 -54 47 15 3 48 5 53 .. .. .. 48 37 18 170 0 0 47 55 31 11 46 36 0 249 -54 47 30 12 48 21 2 .. .. .. .. .. .. Uncertainty in time = +/- 5 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: 2UCAC 27006170 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 29 49.9222 DE: -13 37 35.325 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .072, .029 ) * V mag [mag]: 12.2 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (67) Asia approx. diameter [km]: 62 approx. diameter ["]: .050 distance from Earth [AU]: 1.69300 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1306 number of rejected observations: 135 time covered by the observations: 1907 Nov 02 - 2012 Oct 02 1 sigma uncertainty ellipse (major, minor, PA): 0.009, 0.007, 78° remarks: * orbital elements for (67) Asia : Mean anomaly = 18.52961991 deg Arg. of pericenter = 106.22984277 deg Long. of node = 202.66366037 deg Inclination = 6.02767529 deg Eccentricity = 0.18408025 Semimajor axis = 2.42141654 AU Perihelion dist = 1.97568159 AU Mag: H = 8.28, G = 0.15 Epoch of elements : MJD 56226.49000000 TDT (2012 Oct 26.490) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 26 67 Asia 11h 42.8m UT 12.2 20 29 49.922-13 37 35.332UCAC 27006170 0.0 12.2 62 3.1 1.693 3.937 4.29 96.5012 -13.627 0.28 -12.67 11.7136 -0.05013 0.70876 11.05232 0.82538 0.00518 0.00127 2000 16.83198420121020.00000106.229843202.663660 6.0276750.18408025 2.4214165 1.9756816 8.3 5.00.15 RATE 2.6157720 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.072 0.030 90 1.61 0.031 0 0 2 5 056208.0020121026_006170 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 19:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org