IOTA/IOTA-ES occultation update for (6383) Tokushima / TYC 6853-04308-1 event on 2012 Aug 07, 17:14 UT Visible from SE Australia, Antarctica Summary ------- On 2012 Aug 07 UT, the 15 km diameter asteroid (6383) Tokushima will occult a 10.1 mag star in the constellation Sagittarius for observers along a path across SE Australia, Antarctica. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.3 mag to 16.4 mag (the magnitude of the asteroid) for at most 4.2 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: 9 * date and approx. time of event: 2012 Aug 07, 16:59 - 2012 Aug 07, 17:30 UT * geocentric midpoint of event [JD]: 2456147.21872917 * magnitude of target star: 10.1 * magnitude drop [mag]: 6.3 * estimated maximum duration [s]: 4.2 * Moon: 69 % sunlit, 114° distance * Sun: 134° distance * rough path description: SE Australia, Antarctica The occultation path -------------------- * approximate projected width [km]: 29 * 1 sigma uncertainty interval [path widths]: +/- 7.15 * 1 sigma uncertainty interval [seconds]: +/- 30.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .086 +/- .061) * 1 sigma uncertainty ellipse (major, minor, PA): ( .087", .060", 102° ) * approx speed of asteroid's shadow [km/s]: 3.4557 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6853-04308-1 by 6383 Tokushima on 2012 Aug 7 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 158 26 49 -28 48 57 16 59 31 5 240 -41 159 6 8 -28 31 14 157 51 20 -29 4 27 ... .. .. .. .. .. 152 3 24 -31 13 16 155 40 22 -30 51 26 16 59 55 8 241 -43 156 6 17 -30 41 30 155 15 29 -31 0 45 ... .. .. .. .. .. 150 26 58 -32 34 17 153 41 4 -32 26 51 17 0 18 11 243 -44 154 2 29 -32 19 37 153 20 13 -32 33 46 161 33 36 -29 11 6 149 2 44 -33 48 19 152 3 38 -33 49 45 17 0 42 12 244 -45 152 22 37 -33 43 59 151 44 59 -33 55 19 157 57 45 -31 43 43 147 47 11 -34 57 26 150 39 34 -35 5 2 17 1 6 14 244 -46 150 57 2 -35 0 14 150 22 21 -35 9 41 155 47 0 -33 27 17 146 38 12 -36 2 51 149 24 48 -36 15 3 17 1 30 15 245 -47 149 41 13 -36 10 55 149 8 35 -36 19 3 154 5 1 -34 54 19 145 34 26 -37 5 20 148 17 2 -37 21 8 17 1 53 16 246 -47 148 32 41 -37 17 32 148 1 32 -37 24 38 152 39 8 -36 12 10 144 34 57 -38 5 27 147 14 45 -38 24 11 17 2 17 18 247 -48 147 29 50 -38 21 0 146 59 49 -38 27 17 151 23 56 -37 23 58 143 39 3 -39 3 36 146 16 59 -39 24 46 17 2 41 19 248 -48 146 31 37 -39 21 55 146 2 28 -39 27 32 150 16 35 -38 31 24 142 46 16 -40 0 6 145 23 0 -40 23 20 17 3 5 19 248 -48 145 37 17 -40 20 46 145 8 48 -40 25 50 149 15 18 -39 35 29 141 56 11 -40 55 9 144 32 16 -41 20 11 17 3 29 20 249 -48 144 46 17 -41 17 51 144 18 20 -41 22 27 148 18 56 -40 36 55 141 8 29 -41 48 59 143 44 22 -42 15 35 17 3 52 21 250 -48 143 58 11 -42 13 27 143 30 38 -42 17 39 147 26 41 -41 36 11 140 22 56 -42 41 44 142 59 1 -43 9 43 17 4 16 22 251 -48 143 12 40 -43 7 46 142 45 26 -43 11 36 146 37 58 -42 33 39 139 39 20 -43 33 31 142 15 56 -44 2 45 17 4 40 23 251 -48 142 29 28 -44 0 58 142 2 28 -44 4 29 145 52 20 -43 29 34 138 57 31 -44 24 28 141 34 56 -44 54 50 17 5 4 23 252 -48 141 48 23 -44 53 11 141 21 33 -44 56 25 145 9 27 -44 24 10 138 17 21 -45 14 40 140 55 51 -45 46 2 17 5 27 24 253 -48 141 9 15 -45 44 32 140 42 31 -45 47 31 144 29 3 -45 17 37 137 38 42 -46 4 11 140 18 33 -46 36 30 17 5 51 24 253 -48 140 31 56 -46 35 6 140 5 14 -46 37 51 143 50 55 -46 10 3 137 1 30 -46 53 6 139 42 55 -47 26 16 17 6 15 25 254 -48 139 56 18 -47 24 58 139 29 37 -47 27 31 143 14 54 -47 1 36 136 25 40 -47 41 28 139 8 53 -48 15 26 17 6 39 26 255 -47 139 22 16 -48 14 13 138 55 33 -48 16 36 142 40 52 -47 52 22 135 51 7 -48 29 21 138 36 21 -49 4 2 17 7 3 26 255 -47 138 49 47 -49 2 55 138 22 59 -49 5 7 142 8 43 -48 42 25 135 17 49 -49 16 47 138 5 17 -49 52 9 17 7 26 27 256 -47 138 18 46 -49 51 6 137 51 51 -49 53 9 141 38 21 -49 31 50 134 45 42 -50 3 49 137 35 38 -50 39 49 17 7 50 27 257 -46 137 49 12 -50 38 51 137 22 7 -50 40 45 141 9 42 -50 20 41 134 14 45 -50 50 29 137 7 21 -51 27 5 17 8 14 27 257 -46 137 21 1 -51 26 10 136 53 45 -51 27 57 140 42 44 -51 9 0 133 44 56 -51 36 50 136 40 26 -52 13 58 17 8 38 28 258 -46 136 54 13 -52 13 7 136 26 43 -52 14 47 140 17 26 -51 56 52 133 16 15 -52 22 53 136 14 52 -53 0 32 17 9 2 28 259 -45 136 28 46 -52 59 44 136 1 1 -53 1 18 139 53 45 -52 44 18 132 48 39 -53 8 40 135 50 38 -53 46 48 17 9 25 28 259 -45 136 4 41 -53 46 3 135 36 39 -53 47 30 139 31 41 -53 31 20 132 22 10 -53 54 12 135 27 45 -54 32 47 17 9 49 29 260 -45 135 41 58 -54 32 5 135 13 36 -54 33 27 139 11 15 -54 18 2 131 56 46 -54 39 32 135 6 14 -55 18 32 17 10 13 29 261 -44 135 20 37 -55 17 52 134 51 53 -55 19 9 138 52 27 -55 4 24 131 32 29 -55 24 41 134 46 5 -56 4 3 17 10 37 29 261 -44 135 0 40 -56 3 25 134 31 33 -56 4 39 138 35 20 -55 50 28 131 9 20 -56 9 39 134 27 21 -56 49 22 17 11 0 29 262 -43 134 42 10 -56 48 47 134 12 36 -56 49 56 138 19 55 -56 36 16 130 47 19 -56 54 29 134 10 5 -57 34 31 17 11 24 30 262 -43 134 25 7 -57 33 57 133 55 5 -57 35 3 138 6 16 -57 21 49 130 26 28 -57 39 11 133 54 18 -58 19 30 17 11 48 30 263 -42 134 9 36 -58 18 57 133 39 3 -58 20 1 137 54 26 -58 7 9 130 6 51 -58 23 46 133 40 5 -59 4 20 17 12 12 30 263 -42 133 55 40 -59 3 49 133 24 34 -59 4 50 137 44 29 -58 52 15 129 48 28 -59 8 16 133 27 30 -59 49 3 17 12 36 30 264 -41 133 43 23 -59 48 32 133 11 41 -59 49 31 137 36 32 -59 37 9 129 31 24 -59 52 41 133 16 39 -60 33 38 17 12 59 30 264 -41 133 32 50 -60 33 8 133 0 30 -60 34 6 137 30 39 -60 21 52 129 15 42 -60 37 2 133 7 36 -61 18 8 17 13 23 30 265 -40 133 24 8 -61 17 38 132 51 7 -61 18 35 137 26 59 -61 6 24 129 1 27 -61 21 21 133 0 29 -62 2 32 17 13 47 30 265 -39 133 17 24 -62 2 2 132 43 37 -62 2 59 137 25 39 -61 50 46 128 48 44 -62 5 37 132 55 25 -62 46 50 17 14 11 30 266 -39 133 12 44 -62 46 21 132 38 9 -62 47 17 137 26 49 -62 34 58 128 37 38 -62 49 51 132 52 33 -63 31 5 17 14 34 31 266 -38 133 10 18 -63 30 35 132 34 52 -63 31 32 137 30 40 -63 19 1 128 28 17 -63 34 5 132 52 4 -64 15 14 17 14 58 31 266 -38 133 10 17 -64 14 44 132 33 55 -64 15 43 137 37 24 -64 2 53 128 20 49 -64 18 19 132 54 9 -64 59 20 17 15 22 30 267 -37 133 12 52 -64 58 49 132 35 29 -64 59 49 137 47 14 -64 46 35 128 15 22 -65 2 33 132 59 2 -65 43 22 17 15 46 30 267 -36 133 18 17 -65 42 49 132 39 50 -65 43 52 138 0 27 -65 30 7 128 12 8 -65 46 47 133 6 57 -66 27 20 17 16 10 30 267 -36 133 26 48 -66 26 45 132 47 10 -66 27 52 138 17 21 -66 13 27 128 11 17 -66 31 3 133 18 13 -67 11 12 17 16 33 30 267 -35 133 38 41 -67 10 35 132 57 48 -67 11 47 138 38 16 -66 56 34 128 13 5 -67 15 19 133 33 9 -67 55 0 17 16 57 30 268 -34 133 54 18 -67 54 21 133 12 4 -67 55 37 139 3 37 -67 39 28 128 17 47 -67 59 37 133 52 9 -68 38 42 17 17 21 30 268 -34 134 14 3 -68 37 59 133 30 20 -68 39 22 139 33 48 -68 22 6 128 25 42 -68 43 57 134 15 41 -69 22 17 17 17 45 30 268 -33 134 38 21 -69 21 30 133 53 4 -69 23 1 140 9 21 -69 4 25 128 37 12 -69 28 17 134 44 14 -70 5 43 17 18 8 30 267 -32 135 7 46 -70 4 51 134 20 45 -70 6 32 140 50 50 -69 46 24 128 52 42 -70 12 38 135 18 24 -70 48 59 17 18 32 30 267 -32 135 42 52 -70 48 1 134 54 1 -70 49 52 141 38 55 -70 27 58 129 12 43 -70 56 58 135 58 54 -71 32 1 17 18 56 29 267 -31 136 24 22 -71 30 57 135 33 31 -71 33 1 142 34 20 -71 9 3 129 37 48 -71 41 17 136 46 32 -72 14 46 17 19 20 29 267 -30 137 13 4 -72 13 35 136 20 3 -72 15 53 143 37 55 -71 49 34 130 8 40 -72 25 33 137 42 14 -72 57 10 17 19 44 29 266 -30 138 9 56 -72 55 50 137 14 35 -72 58 26 144 50 38 -72 29 23 130 46 8 -73 9 44 138 47 4 -73 39 8 17 20 7 29 265 -29 139 16 1 -73 37 38 138 18 10 -73 40 33 146 13 32 -73 8 22 131 31 9 -73 53 46 140 2 20 -74 20 32 17 20 31 28 264 -28 140 32 37 -74 18 51 139 32 5 -74 22 9 147 47 48 -73 46 21 132 24 54 -74 37 37 141 29 27 -75 1 15 17 20 55 28 263 -27 142 1 10 -74 59 20 140 57 46 -75 3 5 149 34 44 -74 23 9 133 28 44 -75 21 11 143 10 7 -75 41 5 17 21 19 28 262 -26 143 43 19 -75 38 55 142 36 54 -75 43 10 151 35 44 -74 58 30 134 44 20 -76 4 22 145 6 12 -76 19 50 17 21 42 27 260 -26 145 40 58 -76 17 22 144 31 25 -76 22 13 153 52 13 -75 32 6 136 13 41 -76 47 0 147 19 51 -76 57 12 17 22 6 27 258 -25 147 56 11 -76 54 23 146 43 28 -76 59 55 156 25 40 -76 3 37 137 59 10 -77 28 56 149 53 20 -77 32 51 17 22 30 26 256 -24 150 31 12 -77 29 38 149 15 22 -77 35 57 159 17 23 -76 32 38 140 3 34 -78 9 55 152 49 4 -78 6 21 17 22 54 26 254 -23 153 28 21 -78 2 41 152 9 36 -78 9 55 162 28 26 -76 58 38 142 30 14 -78 49 38 156 9 20 -78 37 12 17 23 18 25 251 -22 156 49 49 -78 33 1 155 28 36 -78 41 17 165 59 25 -77 21 6 145 22 57 -79 27 41 159 56 4 -79 4 47 17 23 41 25 247 -21 160 37 22 -79 0 1 159 14 26 -79 9 26 169 50 14 -77 39 23 148 45 54 -80 3 32 164 10 26 -79 28 23 17 24 5 24 243 -21 164 51 58 -79 22 58 163 28 28 -79 33 40 173 59 46 -77 52 50 152 43 23 -80 36 33 168 52 14 -79 47 10 17 24 29 24 239 -20 169 33 14 -79 41 4 168 10 42 -79 53 10 178 25 44 -78 0 44 157 19 16 -81 5 54 173 59 22 -80 0 18 17 24 53 23 234 -19 174 38 54 -79 53 26 173 19 15 -80 7 3 -176 55 27 -78 2 22 162 36 1 -81 30 36 179 27 22 -80 6 53 17 25 16 22 229 -18 -179 55 39 -79 59 14 178 49 44 -80 14 25 -172 8 34 -77 57 4 168 33 16 -81 49 29 -174 50 42 -80 6 6 17 25 40 22 223 -17 -174 17 17 -79 57 39 -175 24 45 -80 14 26 -167 19 14 -77 44 13 175 6 25 -82 1 23 -169 3 39 -79 57 16 17 26 4 21 218 -16 -168 34 39 -79 48 2 -169 33 14 -80 6 23 -162 33 24 -77 23 15 -177 54 31 -82 5 8 -163 21 8 -79 39 52 17 26 28 20 212 -15 -162 57 5 -79 29 53 -163 45 42 -79 49 45 -157 56 41 -76 53 38 -170 44 16 -81 59 49 -157 52 17 -79 13 35 17 26 52 19 207 -14 -157 33 19 -79 2 50 -158 11 37 -79 24 12 -153 33 55 -76 14 49 -163 40 0 -81 44 52 -152 44 28 -78 38 11 17 27 15 18 202 -12 -152 30 24 -78 26 41 -152 58 47 -78 49 32 -149 28 42 -75 26 6 -156 57 50 -81 20 9 -148 2 45 -77 53 29 17 27 39 17 198 -11 -147 53 6 -77 41 13 -148 12 31 -78 5 36 -145 43 26 -74 26 25 -150 49 47 -80 45 48 -143 49 47 -76 59 10 17 28 3 16 194 -10 -143 43 58 -76 46 2 -143 55 37 -77 12 8 -142 19 18 -73 14 0 -145 22 37 -80 2 8 -140 6 17 -75 54 37 17 28 27 15 190 -9 -140 3 40 -75 40 26 -140 8 50 -76 8 34 -139 16 32 -71 45 39 -140 38 17 -79 9 24 -136 51 36 -74 38 34 17 28 50 13 187 -7 -136 51 34 -74 23 3 -136 51 31 -74 53 48 -136 34 41 -69 54 35 -136 35 27 -78 7 37 -134 4 22 -73 8 38 17 29 14 12 184 -6 -134 6 24 -72 51 13 -134 2 11 -73 25 40 -134 12 27 -67 22 34 -133 10 58 -76 56 27 -131 43 5 -71 20 3 17 29 38 10 182 -4 -131 46 44 -70 59 33 -131 39 13 -71 39 53 ... .. .. .. .. .. -130 21 2 -75 34 54 -129 46 47 -69 1 30 17 30 2 8 180 -2 -129 51 50 -68 34 51 -129 41 31 -69 26 42 ... .. .. .. .. .. -128 2 3 -74 0 54 Uncertainty in time = +/- 37 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: TYC 6853-04308-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 58 07.5682 DE: -28 45 26.272 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .036 ) * V mag [mag]: 10.1 * B mag [mag]: 10.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6383) Tokushima approx. diameter [km]: 15 approx. diameter ["]: .010 distance from Earth [AU]: 2.04500 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 882 number of rejected observations: 12 time covered by the observations: 1955 Jun 27 - 2012 Jun 28 1 sigma uncertainty ellipse (major, minor, PA): 0.083, 0.048, 103° remarks: * orbital elements for (6383) Tokushima : Mean anomaly = 29.83908095 deg Arg. of pericenter = 166.71145256 deg Long. of node = 84.60755042 deg Inclination = 11.14402799 deg Eccentricity = 0.05959326 Semimajor axis = 2.99667296 AU Perihelion dist = 2.81809145 AU Mag: H = 11.68, G = 0.15 Epoch of elements : MJD 56146.71800000 TDT (2012 Aug 07.718) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 7 6383 Tokushima 17h 15.0m UT 10.1 17 58 7.568-28 45 26.27TYC 6853-04308-1 10.3 16.4 15 4.2 2.045 -0.552 -4.17 54.1598 -28.757 -77.32 16.16 17.2495 0.42682 -0.74471 -1.69210 -0.97012 0.00398 0.00035 2000 28.5626862012 8 1.00000166.711453 84.607550 11.1440280.05959326 2.9966730 2.818091411.7 5.00.15 RATE 1.8999630 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.087 0.060 102 8.15 0.072 0 0 2-2 056116.0020120807_4308-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 07, 22:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org