IOTA/IOTA-ES occultation update for (570) Kythera / TYC 1311-00167-1 event on 2009 Apr 08, 01:01 UT Visible from Summary ------- On 2009 Apr 08 UT, the 103 km diameter asteroid (570) Kythera will occult a 10.2 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 15.1 mag (the magnitude of the asteroid) for at most 3.8 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: 91 * date and approx. time of event: 2009 Apr 08, 01:02 - 2009 Apr 08, 01:04 UT * magnitude of target star: 10.2 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 3.8 * Moon: 97 % sunlit, 92° distance * Sun: 68° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 123 * 1 sigma uncertainty interval [path widths]: +/- 0.51 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .020", 90° ) * approx speed of asteroid's shadow [km/s]: 26.7963 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1311-00167-1 by 570 Kythera on 2009 Apr 8 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 - 95 0 0 53 48 48 1 2 25 51 228 0 53 15 7 54 22 42 52 40 58 54 57 31 - 94 0 0 53 41 45 1 2 28 50 230 -1 53 8 1 54 15 42 52 33 49 54 50 34 - 93 0 0 53 34 25 1 2 30 50 231 -1 53 0 37 54 8 25 52 26 23 54 43 20 - 92 0 0 53 26 47 1 2 32 49 232 -2 52 52 56 54 0 50 52 18 38 54 35 49 - 91 0 0 53 18 51 1 2 35 49 234 -3 52 44 57 53 52 58 52 10 36 54 28 0 - 90 0 0 53 10 37 1 2 37 49 235 -3 52 36 40 53 44 48 52 2 16 54 19 54 - 89 0 0 53 2 6 1 2 39 48 236 -4 52 28 5 53 36 20 51 53 37 54 11 30 - 88 0 0 52 53 17 1 2 41 48 238 -4 52 19 13 53 27 35 51 44 41 54 2 48 - 87 0 0 52 44 10 1 2 44 47 239 -5 52 10 2 53 18 31 51 35 27 53 53 49 - 86 0 0 52 34 45 1 2 46 47 240 -6 52 0 33 53 9 10 51 25 54 53 44 31 - 85 0 0 52 25 2 1 2 48 46 242 -6 51 50 46 52 59 31 51 16 3 53 34 56 - 84 0 0 52 15 0 1 2 51 46 243 -7 51 40 41 52 49 33 51 5 54 53 25 3 - 83 0 0 52 4 41 1 2 53 46 244 -8 51 30 17 52 39 18 50 55 27 53 14 51 - 82 0 0 51 54 3 1 2 55 45 245 -8 51 19 36 52 28 44 50 44 41 53 4 22 - 81 0 0 51 43 7 1 2 58 45 247 -9 51 8 35 52 17 52 50 33 37 52 53 34 - 80 0 0 51 31 52 1 3 0 44 248 -10 50 57 17 52 6 42 50 22 14 52 42 28 - 79 0 0 51 20 19 1 3 2 44 249 -10 50 45 39 51 55 13 50 10 32 52 31 4 - 78 0 0 51 8 27 1 3 4 43 250 -11 50 33 44 51 43 25 49 58 32 52 19 21 - 77 0 0 50 56 17 1 3 7 42 251 -12 50 21 29 51 31 20 49 46 14 52 7 19 - 76 0 0 50 43 48 1 3 9 42 252 -12 50 8 56 51 18 55 49 33 36 51 54 59 - 75 0 0 50 31 1 1 3 11 41 254 -13 49 56 4 51 6 12 49 20 40 51 42 21 - 74 0 0 50 17 55 1 3 13 41 255 -14 49 42 54 50 53 10 49 7 25 51 29 24 - 73 0 0 50 4 30 1 3 16 40 256 -14 49 29 24 50 39 50 48 53 51 51 16 8 - 72 0 0 49 50 46 1 3 18 40 257 -15 49 15 36 50 26 11 48 39 59 51 2 34 - 71 0 0 49 36 44 1 3 20 39 258 -16 49 1 30 50 12 13 48 25 48 50 48 40 - 70 0 0 49 22 23 1 3 22 39 259 -16 48 47 4 49 57 56 48 11 18 50 34 28 - 69 0 0 49 7 43 1 3 24 38 260 -17 48 32 20 49 43 21 47 56 29 50 19 57 - 68 0 0 48 52 44 1 3 26 37 261 -18 48 17 17 49 28 26 47 41 22 50 5 8 - 67 0 0 48 37 26 1 3 29 37 262 -18 48 1 55 49 13 13 47 25 56 49 50 0 - 66 0 0 48 21 50 1 3 31 36 263 -19 47 46 14 48 57 42 47 10 11 49 34 33 - 65 0 0 48 5 55 1 3 33 35 264 -20 47 30 15 48 41 51 46 54 7 49 18 47 - 64 0 0 47 49 42 1 3 35 35 265 -20 47 13 57 48 25 42 46 37 45 49 2 42 - 63 0 0 47 33 10 1 3 37 34 266 -21 46 57 21 48 9 15 46 21 5 48 46 19 - 62 0 0 47 16 20 1 3 39 33 267 -22 46 40 26 47 52 29 46 4 6 48 29 38 - 61 0 0 46 59 11 1 3 41 33 268 -23 46 23 13 47 35 24 45 46 49 48 12 37 - 60 0 0 46 41 44 1 3 43 32 269 -23 46 5 42 47 18 1 45 29 13 47 55 19 - 59 0 0 46 23 58 1 3 45 31 270 -24 45 47 53 47 0 20 45 11 20 47 37 42 - 58 0 0 46 5 55 1 3 47 31 271 -25 45 29 45 46 42 20 44 53 8 47 19 47 - 57 0 0 45 47 34 1 3 49 30 272 -25 45 11 20 46 24 3 44 34 39 47 1 34 - 56 0 0 45 28 54 1 3 51 29 272 -26 44 52 37 46 5 28 44 15 52 46 43 3 - 55 0 0 45 9 58 1 3 53 29 273 -27 44 33 37 45 46 35 43 56 48 46 24 14 - 54 0 0 44 50 44 1 3 54 28 274 -28 44 14 19 45 27 25 43 37 27 46 5 8 - 53 0 0 44 31 12 1 3 56 27 275 -28 43 54 44 45 7 57 43 17 49 45 45 44 - 52 0 0 44 11 24 1 3 58 26 276 -29 43 34 53 44 48 13 42 57 53 45 26 3 - 51 0 0 43 51 19 1 4 0 26 277 -30 43 14 44 44 28 11 42 37 42 45 6 5 - 50 0 0 43 30 58 1 4 1 25 277 -31 42 54 20 44 7 53 42 17 14 44 45 50 - 49 0 0 43 10 20 1 4 3 24 278 -31 42 33 39 43 47 18 41 56 30 44 25 19 - 48 0 0 42 49 27 1 4 5 23 279 -32 42 12 42 43 26 28 41 35 31 44 4 32 - 47 0 0 42 28 17 1 4 6 22 280 -33 41 51 30 43 5 22 41 14 16 43 43 28 - 46 0 0 42 6 53 1 4 8 22 281 -33 41 30 3 42 44 0 40 52 46 43 22 10 - 45 0 0 41 45 14 1 4 9 21 281 -34 41 8 21 42 22 23 40 31 1 43 0 36 - 44 0 0 41 23 20 1 4 11 20 282 -35 40 46 25 42 0 32 40 9 3 42 38 47 - 43 0 0 41 1 11 1 4 12 19 283 -36 40 24 14 41 38 26 39 46 50 42 16 43 - 42 0 0 40 38 50 1 4 14 18 284 -36 40 1 50 41 16 6 39 24 24 41 54 26 - 41 0 0 40 16 14 1 4 15 18 284 -37 39 39 13 40 53 33 39 1 45 41 31 55 - 40 0 0 39 53 26 1 4 16 17 285 -38 39 16 23 40 30 47 38 38 53 41 9 10 - 39 0 0 39 30 25 1 4 17 16 286 -39 38 53 21 40 7 48 38 15 49 40 46 13 - 38 0 0 39 7 13 1 4 18 15 286 -39 38 30 7 39 44 36 37 52 33 40 23 3 - 37 0 0 38 43 49 1 4 20 14 287 -40 38 6 41 39 21 14 37 29 7 39 59 42 - 36 0 0 38 20 14 1 4 21 13 288 -41 37 43 5 38 57 40 37 5 29 39 36 9 - 35 0 0 37 56 28 1 4 22 12 288 -41 37 19 18 38 33 55 36 41 42 39 12 26 - 34 0 0 37 32 32 1 4 23 12 289 -42 36 55 22 38 10 0 36 17 45 38 48 32 - 33 0 0 37 8 27 1 4 23 11 290 -43 36 31 17 37 45 56 35 53 39 38 24 28 - 32 0 0 36 44 14 1 4 24 10 290 -44 36 7 3 37 21 43 35 29 24 38 0 15 - 31 0 0 36 19 52 1 4 25 9 291 -44 35 42 40 36 57 21 35 5 2 37 35 54 - 30 0 0 35 55 22 1 4 26 8 291 -45 35 18 11 36 32 51 34 40 32 37 11 24 - 29 0 0 35 30 46 1 4 26 7 292 -46 34 53 34 36 8 15 34 15 56 36 46 48 - 28 0 0 35 6 3 1 4 27 6 293 -46 34 28 52 35 43 32 33 51 14 36 22 4 - 27 0 0 34 41 14 1 4 27 5 293 -47 34 4 4 35 18 42 33 26 26 35 57 14 - 26 0 0 34 16 21 1 4 28 4 294 -47 33 39 11 34 53 48 33 1 33 35 32 19 - 25 0 0 33 51 22 1 4 28 3 294 -48 33 14 13 34 28 49 32 36 37 35 7 19 - 24 0 0 33 26 20 1 4 28 2 295 -49 32 49 12 34 3 46 32 11 37 34 42 15 - 23 0 0 33 1 15 1 4 28 2 295 -49 32 24 8 33 38 40 31 46 34 34 17 8 - 22 0 0 32 36 8 1 4 28 1 296 -50 31 59 2 33 13 31 31 21 30 33 51 57 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 1311-00167-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 45 21.2194 DE: +21 58 08.666 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .018 ) * V mag [mag]: 10.2 * B mag [mag]: 11.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (570) Kythera approx. diameter [km]: 103 approx. diameter ["]: .040 distance from Earth [AU]: 3.56600 * orbital information: orbit source: Preston date of fit: 2008 Mar 19 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1090 number of rejected observations: 125 time covered by the observations: 1905 Jul 31 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.010, 90° remarks: * orbital elements for (570) Kythera : Mean anomaly = 70.81827386 deg Arg. of pericenter = 154.32495196 deg Long. of node = 223.98246872 deg Inclination = 1.78465294 deg Eccentricity = 0.12167117 Semimajor axis = 3.42038430 AU Perihelion dist = 3.00422215 AU Mag: H = 8.62, G = 0.15 Epoch of elements : MJD 54929.04300000 TDT (2009 Apr 08.043) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 8 570 Kythera 1h 1.1m UT 10.2 5 45 21.219 21 58 8.67TYC 1311-00167-1 11.2 15.1 103 3.8 3.566 2.679 1.37 -125.3773 21.969 165.20 7.19 1.0191 -0.02022 0.54257 15.11426 0.55789 0.00540 0.00009 2000 69.4092962009 330.00000154.324952223.982469 1.7846530.12167117 3.4203843 3.0042221 8.8 5.00.15 RATE 1.5580870 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.026 0.020 90 1.51 0.020 0 54545.5020090408_0167-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 06:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org