IOTA/IOTA-ES occultation update for (570) Kythera / TYC 6228-00313-1 event on 2012 Aug 20, 12:17 UT Visible from S Australia Summary ------- On 2012 Aug 20 UT, the 99 km diameter asteroid (570) Kythera will occult a 10.5 mag star in the constellation Ophiuchus for observers along a path across S Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.4 mag to 14.9 mag (the magnitude of the asteroid) for at most 12.4 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: 83 * date and approx. time of event: 2012 Aug 20, 12:15 - 2012 Aug 20, 12:30 UT * geocentric midpoint of event [JD]: 2456160.01242083 * magnitude of target star: 10.5 * magnitude drop [mag]: 4.4 * estimated maximum duration [s]: 12.4 * Moon: 9 % sunlit, 68° distance * Sun: 103° distance * rough path description: S Australia The occultation path -------------------- * approximate projected width [km]: 102 * 1 sigma uncertainty interval [path widths]: +/- 0.63 * 1 sigma uncertainty interval [seconds]: +/- 8.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .027", 91° ) * approx speed of asteroid's shadow [km/s]: 7.9330 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6228-00313-1 by 570 Kythera on 2012 Aug 20 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 80 0 0 -30 46 2 12 15 0 72 61 0 -31 14 44 -30 17 23 -31 50 59 -29 41 22 81 0 0 -31 1 2 12 15 13 72 58 -1 -31 29 41 -30 32 26 -32 5 52 -29 56 29 82 0 0 -31 15 39 12 15 25 73 56 -2 -31 44 15 -30 47 7 -32 20 22 -30 11 13 83 0 0 -31 29 54 12 15 38 74 53 -3 -31 58 27 -31 1 25 -32 34 30 -30 25 35 84 0 0 -31 43 47 12 15 51 74 49 -4 -32 12 17 -31 15 20 -32 48 16 -30 39 34 85 0 0 -31 57 17 12 16 4 75 46 -5 -32 25 44 -31 28 53 -33 1 39 -30 53 11 86 0 0 -32 10 24 12 16 17 75 43 -6 -32 38 48 -31 42 3 -33 14 40 -31 6 25 87 0 0 -32 23 9 12 16 29 76 39 -7 -32 51 30 -31 54 51 -33 27 18 -31 19 16 88 0 0 -32 35 31 12 16 42 76 35 -8 -33 3 49 -32 7 16 -33 39 34 -31 31 44 89 0 0 -32 47 30 12 16 55 76 31 -9 -33 15 46 -32 19 18 -33 51 27 -31 43 50 90 0 0 -32 59 7 12 17 8 76 27 -9 -33 27 19 -32 30 57 -34 2 57 -31 55 32 91 0 0 -33 10 20 12 17 20 77 22 -10 -33 38 30 -32 42 13 -34 14 5 -32 6 52 92 0 0 -33 21 11 12 17 33 77 18 -11 -33 49 19 -32 53 7 -34 24 50 -32 17 49 93 0 0 -33 31 39 12 17 45 77 13 -12 -33 59 44 -33 3 37 -34 35 12 -32 28 22 94 0 0 -33 41 44 12 17 58 77 9 -13 -34 9 47 -33 13 45 -34 45 12 -32 38 33 95 0 0 -33 51 27 12 18 10 77 4 -14 -34 19 27 -33 23 30 -34 54 49 -32 48 21 96 0 0 -34 0 46 12 18 23 77 0 -15 -34 28 44 -33 32 51 -35 4 3 -32 57 45 97 0 0 -34 9 43 12 18 35 76 356 -16 -34 37 39 -33 41 50 -35 12 55 -33 6 47 98 0 0 -34 18 17 12 18 48 76 352 -17 -34 46 11 -33 50 27 -35 21 24 -33 15 26 99 0 0 -34 26 28 12 19 0 76 348 -17 -34 54 20 -33 58 40 -35 29 31 -33 23 41 100 0 0 -34 34 17 12 19 12 76 344 -18 -35 2 6 -34 6 30 -35 37 15 -33 31 34 101 0 0 -34 41 42 12 19 24 75 340 -19 -35 9 30 -34 13 58 -35 44 36 -33 39 4 102 0 0 -34 48 45 12 19 37 75 337 -20 -35 16 31 -34 21 2 -35 51 35 -33 46 11 103 0 0 -34 55 25 12 19 49 74 333 -21 -35 23 10 -34 27 44 -35 58 11 -33 52 55 104 0 0 -35 1 43 12 20 1 74 330 -22 -35 29 26 -34 34 3 -36 4 25 -33 59 16 105 0 0 -35 7 38 12 20 13 73 327 -23 -35 35 19 -34 40 0 -36 10 17 -34 5 14 106 0 0 -35 13 10 12 20 25 73 324 -23 -35 40 50 -34 45 33 -36 15 46 -34 10 50 107 0 0 -35 18 20 12 20 36 72 322 -24 -35 45 58 -34 50 44 -36 20 52 -34 16 2 108 0 0 -35 23 7 12 20 48 72 319 -25 -35 50 44 -34 55 33 -36 25 37 -34 20 52 109 0 0 -35 27 31 12 21 0 71 317 -26 -35 55 7 -34 59 58 -36 29 59 -34 25 19 110 0 0 -35 31 33 12 21 12 70 315 -27 -35 59 8 -35 4 1 -36 33 58 -34 29 24 111 0 0 -35 35 13 12 21 23 70 312 -28 -36 2 47 -35 7 42 -36 37 36 -34 33 5 112 0 0 -35 38 30 12 21 35 69 310 -29 -36 6 3 -35 11 0 -36 40 51 -34 36 24 113 0 0 -35 41 25 12 21 46 68 309 -29 -36 8 57 -35 13 55 -36 43 44 -34 39 21 114 0 0 -35 43 57 12 21 58 68 307 -30 -36 11 29 -35 16 28 -36 46 15 -34 41 54 115 0 0 -35 46 7 12 22 9 67 305 -31 -36 13 38 -35 18 38 -36 48 23 -34 44 5 116 0 0 -35 47 54 12 22 20 66 303 -32 -36 15 25 -35 20 26 -36 50 10 -34 45 54 117 0 0 -35 49 20 12 22 31 65 302 -33 -36 16 50 -35 21 52 -36 51 34 -34 47 20 118 0 0 -35 50 22 12 22 42 65 300 -34 -36 17 53 -35 22 55 -36 52 37 -34 48 23 119 0 0 -35 51 3 12 22 53 64 299 -34 -36 18 33 -35 23 36 -36 53 17 -34 49 4 120 0 0 -35 51 21 12 23 4 63 297 -35 -36 18 52 -35 23 54 -36 53 35 -34 49 23 121 0 0 -35 51 18 12 23 15 63 296 -36 -36 18 48 -35 23 50 -36 53 32 -34 49 19 122 0 0 -35 50 51 12 23 26 62 295 -37 -36 18 22 -35 23 24 -36 53 6 -34 48 52 123 0 0 -35 50 3 12 23 37 61 293 -38 -36 17 34 -35 22 35 -36 52 18 -34 48 3 124 0 0 -35 48 53 12 23 47 60 292 -39 -36 16 24 -35 21 25 -36 51 9 -34 46 52 125 0 0 -35 47 20 12 23 58 59 291 -39 -36 14 52 -35 19 51 -36 49 37 -34 45 18 126 0 0 -35 45 25 12 24 8 59 290 -40 -36 12 57 -35 17 56 -36 47 44 -34 43 22 127 0 0 -35 43 8 12 24 19 58 289 -41 -36 10 41 -35 15 39 -36 45 28 -34 41 4 128 0 0 -35 40 29 12 24 29 57 288 -42 -36 8 3 -35 12 59 -36 42 51 -34 38 23 129 0 0 -35 37 28 12 24 39 56 287 -43 -36 5 3 -35 9 57 -36 39 52 -34 35 20 130 0 0 -35 34 5 12 24 50 55 286 -44 -36 1 40 -35 6 33 -36 36 31 -34 31 55 131 0 0 -35 30 20 12 25 0 55 285 -44 -35 57 56 -35 2 46 -36 32 48 -34 28 7 132 0 0 -35 26 12 12 25 10 54 284 -45 -35 53 50 -34 58 38 -36 28 43 -34 23 57 133 0 0 -35 21 43 12 25 19 53 283 -46 -35 49 22 -34 54 7 -36 24 16 -34 19 25 134 0 0 -35 16 52 12 25 29 52 282 -47 -35 44 32 -34 49 15 -36 19 28 -34 14 31 135 0 0 -35 11 38 12 25 39 51 281 -48 -35 39 20 -34 44 0 -36 14 18 -34 9 14 136 0 0 -35 6 3 12 25 49 51 280 -48 -35 33 46 -34 38 23 -36 8 46 -34 3 35 137 0 0 -35 0 5 12 25 58 50 279 -49 -35 27 50 -34 32 24 -36 2 52 -33 57 34 138 0 0 -34 53 46 12 26 7 49 278 -50 -35 21 32 -34 26 3 -35 56 36 -33 51 11 139 0 0 -34 47 5 12 26 17 48 277 -51 -35 14 53 -34 19 20 -35 49 59 -33 44 26 140 0 0 -34 40 1 12 26 26 47 276 -52 -35 7 51 -34 12 15 -35 43 0 -33 37 19 141 0 0 -34 32 36 12 26 35 46 276 -53 -35 0 28 -34 4 48 -35 35 39 -33 29 49 142 0 0 -34 24 49 12 26 44 46 275 -53 -34 52 43 -33 56 59 -35 27 56 -33 21 58 143 0 0 -34 16 40 12 26 53 45 274 -54 -34 44 36 -33 48 48 -35 19 52 -33 13 44 144 0 0 -34 8 10 12 27 2 44 273 -55 -34 36 7 -33 40 15 -35 11 26 -33 5 9 145 0 0 -33 59 17 12 27 10 43 272 -56 -34 27 17 -33 31 20 -35 2 39 -32 56 11 146 0 0 -33 50 3 12 27 19 42 272 -57 -34 18 5 -33 22 3 -34 53 29 -32 46 52 147 0 0 -33 40 27 12 27 27 41 271 -57 -34 8 31 -33 12 25 -34 43 58 -32 37 11 148 0 0 -33 30 29 12 27 36 41 270 -58 -33 58 36 -33 2 25 -34 34 6 -32 27 8 149 0 0 -33 20 9 12 27 44 40 270 -59 -33 48 19 -32 52 3 -34 23 52 -32 16 43 150 0 0 -33 9 28 12 27 52 39 269 -60 -33 37 40 -32 41 20 -34 13 17 -32 5 56 151 0 0 -32 58 26 12 28 0 38 268 -61 -33 26 40 -32 30 15 -34 2 20 -31 54 48 152 0 0 -32 47 2 12 28 8 37 267 -61 -33 15 19 -32 18 48 -33 51 2 -31 43 18 153 0 0 -32 35 16 12 28 15 36 267 -62 -33 3 36 -32 7 0 -33 39 22 -31 31 27 154 0 0 -32 23 9 12 28 23 35 266 -63 -32 51 32 -31 54 50 -33 27 21 -31 19 14 155 0 0 -32 10 41 12 28 30 34 266 -64 -32 39 6 -31 42 20 -33 14 59 -31 6 40 156 0 0 -31 57 52 12 28 37 34 265 -64 -32 26 20 -31 29 28 -33 2 16 -30 53 44 157 0 0 -31 44 42 12 28 44 33 264 -65 -32 13 12 -31 16 14 -32 49 12 -30 40 28 158 0 0 -31 31 10 12 28 51 32 264 -66 -31 59 44 -31 2 40 -32 35 47 -30 26 50 159 0 0 -31 17 18 12 28 58 31 263 -67 -31 45 54 -30 48 45 -32 22 1 -30 12 52 160 0 0 -31 3 5 12 29 5 30 262 -67 -31 31 44 -30 34 29 -32 7 55 -29 58 32 161 0 0 -30 48 31 12 29 11 29 262 -68 -31 17 13 -30 19 53 -31 53 28 -29 43 52 162 0 0 -30 33 37 12 29 18 28 261 -69 -31 2 22 -30 4 56 -31 38 40 -29 28 51 163 0 0 -30 18 22 12 29 24 27 261 -69 -30 47 10 -29 49 38 -31 23 32 -29 13 30 164 0 0 -30 2 48 12 29 30 26 260 -70 -30 31 38 -29 34 1 -31 8 4 -28 57 49 165 0 0 -29 46 53 12 29 36 25 260 -71 -30 15 46 -29 18 3 -30 52 16 -28 41 48 166 0 0 -29 30 38 12 29 41 24 259 -71 -29 59 34 -29 1 45 -30 36 7 -28 25 27 167 0 0 -29 14 4 12 29 47 24 258 -72 -29 43 3 -28 45 8 -30 19 40 -28 8 46 168 0 0 -28 57 10 12 29 52 23 258 -73 -29 26 12 -28 28 11 -30 2 52 -27 51 46 169 0 0 -28 39 56 12 29 57 22 257 -73 -29 9 1 -28 10 55 -29 45 45 -27 34 26 170 0 0 -28 22 24 12 30 2 21 257 -74 -28 51 32 -27 53 20 -29 28 20 -27 16 47 171 0 0 -28 4 33 12 30 7 20 256 -74 -28 33 44 -27 35 26 -29 10 35 -26 58 50 172 0 0 -27 46 23 12 30 11 19 256 -74 -28 15 37 -27 17 14 -28 52 32 -26 40 34 173 0 0 -27 27 55 12 30 16 18 255 -75 -27 57 11 -26 58 43 -28 34 10 -26 22 0 174 0 0 -27 9 9 12 30 20 17 255 -75 -27 38 28 -26 39 54 -28 15 30 -26 3 8 175 0 0 -26 50 5 12 30 24 16 254 -75 -27 19 27 -26 20 47 -27 56 32 -25 43 58 176 0 0 -26 30 44 12 30 28 15 254 -75 -27 0 8 -26 1 23 -27 37 17 -25 24 30 177 0 0 -26 11 5 12 30 31 14 253 -76 -26 40 32 -25 41 42 -27 17 44 -25 4 46 178 0 0 -25 51 10 12 30 34 13 253 -76 -26 20 39 -25 21 44 -26 57 54 -24 44 45 179 0 0 -25 30 58 12 30 37 12 253 -76 -26 0 30 -25 1 30 -26 37 48 -24 24 27 180 0 0 -25 10 30 12 30 40 11 252 -76 -25 40 4 -24 40 59 -26 17 25 -24 3 54 -179 0 0 -24 49 46 12 30 43 10 252 -75 -25 19 22 -24 20 13 -25 56 47 -23 43 5 -178 0 0 -24 28 46 12 30 45 9 251 -75 -24 58 25 -23 59 11 -25 35 53 -23 22 0 -177 0 0 -24 7 32 12 30 47 8 251 -75 -24 37 13 -23 37 55 -25 14 43 -23 0 41 -176 0 0 -23 46 3 12 30 49 7 250 -74 -24 15 46 -23 16 24 -24 53 19 -22 39 7 -175 0 0 -23 24 20 12 30 51 6 250 -74 -23 54 5 -22 54 38 -24 31 40 -22 17 19 -174 0 0 -23 2 22 12 30 52 5 250 -74 -23 32 10 -22 32 39 -24 9 48 -21 55 17 -173 0 0 -22 40 12 12 30 54 4 249 -73 -23 10 1 -22 10 27 -23 47 42 -21 33 3 -172 0 0 -22 17 49 12 30 55 3 249 -73 -22 47 40 -21 48 2 -23 25 23 -21 10 35 -171 0 0 -21 55 13 12 30 55 2 249 -72 -22 25 6 -21 25 24 -23 2 51 -20 47 56 -170 0 0 -21 32 25 12 30 56 1 248 -71 -22 2 20 -21 2 35 -22 40 7 -20 25 4 -169 0 0 -21 9 26 12 30 56 0 248 -71 -21 39 22 -20 39 34 -22 17 11 .. .. .. Uncertainty in time = +/- 9 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: TYC 6228-00313-1 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 38 35.4864 DE: -20 44 14.620 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .028, .025 ) * V mag [mag]: 10.5 * B mag [mag]: 11.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (570) Kythera approx. diameter [km]: 99 approx. diameter ["]: .043 distance from Earth [AU]: 3.15500 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1328 number of rejected observations: 126 time covered by the observations: 1905 Jul 31 - 2012 Jul 03 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.011, 96° remarks: * orbital elements for (570) Kythera : Mean anomaly = 261.77248749 deg Arg. of pericenter = 154.96159136 deg Long. of node = 223.91550432 deg Inclination = 1.78665308 deg Eccentricity = 0.12195443 Semimajor axis = 3.42045433 AU Perihelion dist = 3.00331478 AU Mag: H = 8.64, G = 0.15 Epoch of elements : MJD 56159.51200000 TDT (2012 Aug 20.512) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 20 570 Kythera 12h 17.9m UT 10.5 16 38 35.486-20 44 14.62TYC 6228-00313-1 11.7 14.9 99 12.4 3.155 0.878 -2.08 95.9370 -20.737 -3.65 12.21 12.2981 -0.03657 -0.21979 4.41486 -0.74682 0.00557 -0.00081 2000 260.2904802012 811.00000154.961591223.915504 1.7866530.12195443 3.4204543 3.0033148 8.8 5.00.15 RATE 1.5580390 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.032 0.027 91 1.63 0.027 0 0 4 0 056116.0020120820_0313-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 07, 23:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org