IOTA/IOTA-ES occultation update for (111) Ate / TYC 6330-00805-1 event on 2012 Sep 14, 12:20 UT Visible from Japan, China Summary ------- On 2012 Sep 14 UT, the 147 km diameter asteroid (111) Ate will occult a 9.9 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 2.8 mag to 12.6 mag (the magnitude of the asteroid) for at most 29.2 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: UCAC. The event at a glimpse ---------------------- * Rank: 97 * date and approx. time of event: 2012 Sep 14, 12:05 - 2012 Sep 14, 12:30 UT * geocentric midpoint of event [JD]: 2456185.0137375 * magnitude of target star: 9.9 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 29.2 * Moon: 4 % sunlit, 157° distance * Sun: 136° distance * rough path description: Japan, China The occultation path -------------------- * approximate projected width [km]: 220 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 7.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .039) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .026", 359° ) * approx speed of asteroid's shadow [km/s]: 5.0278 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6330-00805-1 by 111 Ate on 2012 Sep 14 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 84 0 0 33 17 11 12 30 47 25 132 -1 34 19 2 32 16 35 35 8 12 31 30 7 85 0 0 33 7 52 12 30 36 25 133 -1 34 9 37 32 7 22 34 58 42 31 20 58 86 0 0 32 58 53 12 30 24 26 133 -2 34 0 32 31 58 28 34 49 32 31 12 9 87 0 0 32 50 14 12 30 12 27 134 -3 33 51 47 31 49 55 34 40 42 31 3 39 88 0 0 32 41 55 12 30 0 27 135 -4 33 43 22 31 41 41 34 32 13 30 55 30 89 0 0 32 33 56 12 29 48 28 136 -5 33 35 18 31 33 47 34 24 4 30 47 40 90 0 0 32 26 18 12 29 35 29 136 -6 33 27 35 31 26 14 34 16 16 30 40 10 91 0 0 32 19 0 12 29 22 29 137 -6 33 20 11 31 19 0 34 8 49 30 33 0 92 0 0 32 12 2 12 29 8 30 138 -7 33 13 9 31 12 7 34 1 42 30 26 10 93 0 0 32 5 25 12 28 55 31 139 -8 33 6 27 31 5 34 33 54 57 30 19 40 94 0 0 31 59 8 12 28 41 31 140 -9 33 0 6 30 59 22 33 48 32 30 13 31 95 0 0 31 53 12 12 28 27 32 141 -10 32 54 5 30 53 29 33 42 28 30 7 41 96 0 0 31 47 36 12 28 13 32 141 -10 32 48 26 30 47 57 33 36 45 30 2 12 97 0 0 31 42 21 12 27 59 33 142 -11 32 43 7 30 42 46 33 31 23 29 57 3 98 0 0 31 37 27 12 27 44 34 143 -12 32 38 9 30 37 55 33 26 22 29 52 15 99 0 0 31 32 53 12 27 29 34 144 -13 32 33 32 30 33 24 33 21 43 29 47 47 100 0 0 31 28 40 12 27 14 35 145 -14 32 29 16 30 29 14 33 17 24 29 43 39 101 0 0 31 24 48 12 26 59 35 146 -14 32 25 21 30 25 25 33 13 26 29 39 51 102 0 0 31 21 16 12 26 44 36 147 -15 32 21 47 30 21 56 33 9 50 29 36 24 103 0 0 31 18 6 12 26 28 36 148 -16 32 18 33 30 18 48 33 6 35 29 33 18 104 0 0 31 15 16 12 26 12 37 149 -17 32 15 41 30 16 0 33 3 41 29 30 31 105 0 0 31 12 47 12 25 56 37 150 -18 32 13 10 30 13 33 33 1 8 29 28 6 106 0 0 31 10 38 12 25 40 37 151 -18 32 11 0 30 11 26 32 58 56 29 26 0 107 0 0 31 8 50 12 25 24 38 152 -19 32 9 10 30 9 40 32 57 6 29 24 15 108 0 0 31 7 23 12 25 8 38 153 -20 32 7 42 30 8 14 32 55 36 29 22 50 109 0 0 31 6 17 12 24 52 39 154 -21 32 6 35 30 7 9 32 54 28 29 21 46 110 0 0 31 5 32 12 24 35 39 155 -21 32 5 48 30 6 24 32 53 41 29 21 2 111 0 0 31 5 7 12 24 18 39 156 -22 32 5 23 30 6 0 32 53 14 29 20 38 112 0 0 31 5 3 12 24 2 40 157 -23 32 5 18 30 5 56 32 53 9 29 20 35 113 0 0 31 5 19 12 23 45 40 158 -24 32 5 34 30 6 13 32 53 25 29 20 52 114 0 0 31 5 56 12 23 28 40 159 -24 32 6 11 30 6 50 32 54 2 29 21 29 115 0 0 31 6 54 12 23 11 40 160 -25 32 7 9 30 7 48 32 55 0 29 22 26 116 0 0 31 8 12 12 22 53 41 161 -26 32 8 28 30 9 5 32 56 19 29 23 44 117 0 0 31 9 51 12 22 36 41 163 -27 32 10 7 30 10 43 32 57 59 29 25 21 118 0 0 31 11 50 12 22 19 41 164 -27 32 12 7 30 12 42 32 59 59 29 27 19 119 0 0 31 14 9 12 22 2 41 165 -28 32 14 27 30 15 0 33 2 21 29 29 37 120 0 0 31 16 49 12 21 44 41 166 -29 32 17 8 30 17 39 33 5 3 29 32 15 121 0 0 31 19 49 12 21 27 42 167 -29 32 20 10 30 20 38 33 8 6 29 35 12 122 0 0 31 23 9 12 21 9 42 168 -30 32 23 32 30 23 56 33 11 29 29 38 30 123 0 0 31 26 50 12 20 52 42 170 -31 32 27 14 30 27 35 33 15 13 29 42 7 124 0 0 31 30 50 12 20 34 42 171 -31 32 31 17 30 31 33 33 19 18 29 46 4 125 0 0 31 35 11 12 20 17 42 172 -32 32 35 40 30 35 52 33 23 42 29 50 21 126 0 0 31 39 52 12 19 59 42 173 -33 32 40 23 30 40 30 33 28 28 29 54 57 127 0 0 31 44 52 12 19 41 42 174 -33 32 45 26 30 45 28 33 33 33 29 59 53 128 0 0 31 50 12 12 19 24 42 176 -34 32 50 49 30 50 45 33 38 59 30 5 9 129 0 0 31 55 52 12 19 6 42 177 -35 32 56 33 30 56 22 33 44 45 30 10 44 130 0 0 32 1 52 12 18 49 42 178 -35 33 2 36 31 2 19 33 50 50 30 16 38 131 0 0 32 8 11 12 18 31 42 179 -36 33 8 58 31 8 35 33 57 16 30 22 51 132 0 0 32 14 50 12 18 14 42 180 -37 33 15 41 31 15 10 34 4 2 30 29 23 133 0 0 32 21 48 12 17 56 41 182 -37 33 22 43 31 22 4 34 11 7 30 36 15 134 0 0 32 29 5 12 17 39 41 183 -38 33 30 4 31 29 17 34 18 32 30 43 25 135 0 0 32 36 41 12 17 22 41 184 -38 33 37 45 31 36 49 34 26 16 30 50 54 136 0 0 32 44 37 12 17 5 41 185 -39 33 45 45 31 44 40 34 34 20 30 58 42 137 0 0 32 52 51 12 16 47 41 186 -39 33 54 4 31 52 50 34 42 43 31 6 49 138 0 0 33 1 24 12 16 30 41 187 -40 34 2 42 32 1 19 34 51 25 31 15 14 139 0 0 33 10 16 12 16 13 40 189 -40 34 11 39 32 10 6 35 0 26 31 23 57 140 0 0 33 19 26 12 15 56 40 190 -41 34 20 54 32 19 11 35 9 46 31 32 59 141 0 0 33 28 54 12 15 39 40 191 -41 34 30 28 32 28 34 35 19 24 31 42 18 142 0 0 33 38 41 12 15 23 39 192 -42 34 40 21 32 38 16 35 29 21 31 51 56 143 0 0 33 48 46 12 15 6 39 193 -42 34 50 31 32 48 15 35 39 37 32 1 51 144 0 0 33 59 9 12 14 50 39 194 -43 35 1 0 32 58 32 35 50 11 32 12 4 145 0 0 34 9 50 12 14 33 38 195 -43 35 11 47 33 9 7 36 1 3 32 22 35 146 0 0 34 20 48 12 14 17 38 196 -44 35 22 52 33 20 0 36 12 13 32 33 23 147 0 0 34 32 4 12 14 1 38 197 -44 35 34 14 33 31 9 36 23 40 32 44 28 148 0 0 34 43 37 12 13 45 37 198 -44 35 45 54 33 42 36 36 35 26 32 55 50 149 0 0 34 55 27 12 13 29 37 199 -45 35 57 51 33 54 20 36 47 28 33 7 29 150 0 0 35 7 34 12 13 14 36 200 -45 36 10 4 34 6 20 36 59 48 33 19 24 151 0 0 35 19 57 12 12 58 36 201 -45 36 22 35 34 18 37 37 12 24 33 31 36 152 0 0 35 32 37 12 12 43 35 202 -45 36 35 23 34 31 10 37 25 18 33 44 5 153 0 0 35 45 34 12 12 28 35 203 -46 36 48 26 34 44 0 37 38 27 33 56 49 154 0 0 35 58 46 12 12 13 34 204 -46 37 1 46 34 57 5 37 51 53 34 9 49 155 0 0 36 12 14 12 11 58 34 205 -46 37 15 22 35 10 26 38 5 36 34 23 5 156 0 0 36 25 58 12 11 44 33 206 -46 37 29 13 35 24 3 38 19 33 34 36 36 157 0 0 36 39 57 12 11 30 33 207 -47 37 43 20 35 37 54 38 33 47 34 50 22 158 0 0 36 54 11 12 11 16 32 208 -47 37 57 42 35 52 1 38 48 15 35 4 24 159 0 0 37 8 40 12 11 2 32 209 -47 38 12 19 36 6 23 39 2 59 35 18 40 160 0 0 37 23 24 12 10 48 31 210 -47 38 27 11 36 20 58 39 17 57 35 33 10 161 0 0 37 38 22 12 10 35 30 211 -47 38 42 17 36 35 49 39 33 10 35 47 54 162 0 0 37 53 33 12 10 22 30 212 -47 38 57 37 36 50 53 39 48 37 36 2 53 163 0 0 38 8 59 12 10 9 29 213 -47 39 13 11 37 6 10 40 4 18 36 18 5 164 0 0 38 24 38 12 9 56 29 213 -47 39 28 58 37 21 41 40 20 12 36 33 30 165 0 0 38 40 29 12 9 44 28 214 -47 39 44 58 37 37 25 40 36 19 36 49 8 166 0 0 38 56 34 12 9 32 27 215 -47 40 1 11 37 53 22 40 52 39 37 4 59 167 0 0 39 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44 25 43 42 13 54 45 18 53 41 24 6 -178 0 0 43 37 39 12 6 59 16 227 -43 44 44 27 42 32 24 45 37 43 41 42 30 -177 0 0 43 56 22 12 6 52 15 228 -43 45 3 17 42 51 0 45 56 39 42 1 1 -176 0 0 44 15 10 12 6 45 15 229 -42 45 22 12 43 9 41 46 15 40 42 19 37 -175 0 0 44 34 3 12 6 39 14 230 -42 45 41 12 43 28 28 46 34 46 42 38 19 -174 0 0 44 53 0 12 6 33 13 230 -41 46 0 16 43 47 19 46 53 56 42 57 5 -173 0 0 45 12 1 12 6 27 13 231 -41 46 19 24 44 6 14 47 13 9 43 15 56 -172 0 0 45 31 6 12 6 22 12 232 -41 46 38 35 44 25 12 47 32 25 43 34 50 -171 0 0 45 50 13 12 6 17 11 233 -40 46 57 48 44 44 14 47 51 44 43 53 47 -170 0 0 46 9 23 12 6 13 10 233 -40 47 17 4 45 3 18 48 11 4 44 12 48 -169 0 0 46 28 35 12 6 8 10 234 -39 47 36 22 45 22 25 48 30 27 44 31 50 -168 0 0 46 47 48 12 6 4 9 235 -39 47 55 40 45 41 33 48 49 49 44 50 55 -167 0 0 47 7 2 12 6 1 8 236 -38 48 14 59 46 0 42 49 9 13 45 10 1 -166 0 0 47 26 17 12 5 58 7 236 -37 48 34 18 46 19 52 49 28 36 45 29 7 -165 0 0 47 45 31 12 5 55 7 237 -37 48 53 37 46 39 2 49 47 58 45 48 14 -164 0 0 48 4 44 12 5 52 6 238 -36 49 12 55 46 58 12 50 7 19 46 7 21 -163 0 0 48 23 57 12 5 50 5 239 -36 49 32 11 47 17 21 50 26 38 46 26 27 -162 0 0 48 43 7 12 5 48 4 239 -35 49 51 25 47 36 28 50 45 55 46 45 32 -161 0 0 49 2 16 12 5 46 4 240 -35 50 10 36 47 55 33 51 5 9 47 4 35 -160 0 0 49 21 21 12 5 45 3 241 -34 50 29 45 48 14 37 51 24 20 47 23 36 -159 0 0 49 40 24 12 5 44 2 242 -33 50 48 50 48 33 37 51 43 27 .. .. .. -158 0 0 49 59 23 12 5 43 2 242 -33 51 7 51 48 52 33 52 2 29 .. .. .. -157 0 0 50 18 17 12 5 42 1 243 -32 51 26 47 49 11 26 .. .. .. .. .. .. -156 0 0 50 37 7 12 5 42 0 244 -32 .. .. .. 49 30 15 .. .. .. .. .. .. Uncertainty in time = +/- 12 secs Prediction of 2012 Sep 8.0 Data for the target star ------------------------ * name: TYC 6330-00805-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 39 58.2991 DE: -16 19 00.522 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .039 ) * V mag [mag]: 9.9 * B mag [mag]: 10.2 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (111) Ate approx. diameter [km]: 147 approx. diameter ["]: .101 distance from Earth [AU]: 2.00500 * orbital information: orbit source: Preston date of fit: 2012 Sep 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1302 number of rejected observations: 112 time covered by the observations: 1908 Sep 21 - 2012 Sep 01 1 sigma uncertainty ellipse (major, minor, PA): 0.010, 0.007, 69° remarks: * orbital elements for (111) Ate : Mean anomaly = 215.95264141 deg Arg. of pericenter = 167.03133152 deg Long. of node = 305.76960633 deg Inclination = 4.93174166 deg Eccentricity = 0.10331064 Semimajor axis = 2.59309638 AU Perihelion dist = 2.32520194 AU Mag: H = 8.09, G = 0.15 Epoch of elements : MJD 56184.51400000 TDT (2012 Sep 14.514) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 14 111 Ate 12h 19.8m UT 9.9 20 39 58.299-16 19 0.52TYC 6330-00805-1 10.2 12.6 147 29.2 2.005 -0.859 -1.16 131.1661 -16.316 -6.09 3.14 12.3297 -0.06920 0.73954 -2.82535 -0.26591 0.00385 0.00087 2000 214.8871802012 910.00000167.031332305.769606 4.9317420.10331064 2.5930964 2.3252019 8.0 5.00.15 RATE 2.3603480 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.026 359 1.39 0.039 0 0 1-2 056178.0020120914_0805-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 07, 22:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org