IOTA/IOTA-ES occultation update for (2509) Chukotka / TYC 0628-00415-1 event on 2012 Sep 29, 02:20 UT Visible from Russia, Europe, E USA Summary ------- On 2012 Sep 29 UT, the 18 km diameter asteroid (2509) Chukotka will occult a 11.2 mag star in the constellation Aries for observers along a path across Russia, Europe, E USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.0 mag to 15.2 mag (the magnitude of the asteroid) for at most 2.9 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: 27 * date and approx. time of event: 2012 Sep 29, 02:08 - 2012 Sep 29, 02:33 UT * geocentric midpoint of event [JD]: 2456199.59722083 * magnitude of target star: 11.2 * magnitude drop [mag]: 4.0 * estimated maximum duration [s]: 2.9 * Moon: 99 % sunlit, 38° distance * Sun: 155° distance * rough path description: Russia, Europe, E USA The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 2.47 * 1 sigma uncertainty interval [seconds]: +/- 9.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .073 +/- .056) * 1 sigma uncertainty ellipse (major, minor, PA): ( .076", .053", 70° ) * approx speed of asteroid's shadow [km/s]: 6.3963 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0628-00415-1 by 2509 Chukotka on 2012 Sep 29 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 -115 0 0 26 18 52 2 33 21 1 74 -15 26 25 8 26 12 36 26 56 14 .. .. .. -114 0 0 26 35 12 2 33 21 2 74 -16 26 41 29 26 28 56 27 12 37 .. .. .. -113 0 0 26 51 44 2 33 20 3 75 -17 26 58 1 26 45 27 27 29 11 .. .. .. -112 0 0 27 8 26 2 33 19 4 75 -18 27 14 44 27 2 9 27 45 56 .. .. .. -111 0 0 27 25 19 2 33 17 5 76 -19 27 31 37 27 19 2 28 2 52 26 48 6 -110 0 0 27 42 23 2 33 16 6 76 -20 27 48 41 27 36 5 28 19 57 27 5 7 -109 0 0 27 59 36 2 33 14 6 77 -20 28 5 54 27 53 18 28 37 13 27 22 17 -108 0 0 28 16 58 2 33 11 7 77 -21 28 23 17 28 10 39 28 54 37 27 39 37 -107 0 0 28 34 29 2 33 8 8 78 -22 28 40 48 28 28 10 29 12 10 27 57 6 -106 0 0 28 52 8 2 33 5 9 78 -23 28 58 28 28 45 49 29 29 52 28 14 43 -105 0 0 29 9 55 2 33 2 10 79 -24 29 16 15 29 3 35 29 47 41 28 32 28 -104 0 0 29 27 49 2 32 59 11 79 -24 29 34 10 29 21 29 30 5 38 28 50 20 -103 0 0 29 45 51 2 32 55 12 80 -25 29 52 12 29 39 30 30 23 41 29 8 19 -102 0 0 30 3 59 2 32 50 13 80 -26 30 10 20 29 57 38 30 41 51 29 26 25 -101 0 0 30 22 13 2 32 46 14 81 -27 30 28 34 30 15 52 31 0 7 29 44 37 -100 0 0 30 40 32 2 32 41 15 81 -27 30 46 54 30 34 11 31 18 29 30 2 55 - 99 0 0 30 58 57 2 32 36 15 82 -28 31 5 19 30 52 35 31 36 56 30 21 18 - 98 0 0 31 17 27 2 32 31 16 82 -29 31 23 49 31 11 5 31 55 27 30 39 45 - 97 0 0 31 36 0 2 32 25 17 83 -30 31 42 23 31 29 38 32 14 3 30 58 17 - 96 0 0 31 54 38 2 32 20 18 83 -30 32 1 1 31 48 15 32 32 42 31 16 53 - 95 0 0 32 13 19 2 32 13 19 84 -31 32 19 42 32 6 56 32 51 25 31 35 32 - 94 0 0 32 32 3 2 32 7 20 85 -32 32 38 27 32 25 40 33 10 11 31 54 14 - 93 0 0 32 50 49 2 32 1 21 85 -32 32 57 13 32 44 26 33 28 59 32 12 59 - 92 0 0 33 9 38 2 31 54 21 86 -33 33 16 2 33 3 14 33 47 49 32 31 46 - 91 0 0 33 28 28 2 31 47 22 87 -34 33 34 52 33 22 4 34 6 41 32 50 35 - 90 0 0 33 47 19 2 31 40 23 87 -34 33 53 44 33 40 55 34 25 33 33 9 25 - 89 0 0 34 6 11 2 31 32 24 88 -35 34 12 36 33 59 47 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2 18 54 53 175 -38 51 43 44 51 31 21 52 14 30 51 0 53 - 17 0 0 51 45 36 2 18 43 53 177 -38 51 51 48 51 39 25 52 22 32 51 8 59 - 16 0 0 51 53 27 2 18 33 53 178 -38 51 59 39 51 47 17 52 30 21 51 16 52 - 15 0 0 52 1 6 2 18 22 53 180 -37 52 7 16 51 54 55 52 37 56 51 24 32 - 14 0 0 52 8 31 2 18 12 53 181 -37 52 14 41 52 2 20 52 45 19 51 32 0 - 13 0 0 52 15 43 2 18 2 53 183 -36 52 21 53 52 9 33 52 52 29 51 39 14 - 12 0 0 52 22 42 2 17 51 52 184 -36 52 28 51 52 16 32 52 59 26 51 46 15 - 11 0 0 52 29 27 2 17 41 52 186 -36 52 35 37 52 23 18 53 6 10 51 53 3 - 10 0 0 52 36 0 2 17 31 52 187 -35 52 42 10 52 29 52 53 12 41 51 59 38 - 9 0 0 52 42 20 2 17 21 52 189 -35 52 48 29 52 36 12 53 18 59 52 6 0 - 8 0 0 52 48 27 2 17 11 52 190 -34 52 54 36 52 42 19 53 25 4 52 12 9 - 7 0 0 52 54 21 2 17 1 51 192 -34 53 0 30 52 48 14 53 30 56 52 18 5 - 6 0 0 53 0 3 2 16 51 51 193 -34 53 6 10 52 53 55 53 36 35 52 23 47 - 5 0 0 53 5 31 2 16 41 51 195 -33 53 11 38 52 59 24 53 42 1 52 29 17 - 4 0 0 53 10 46 2 16 31 51 196 -33 53 16 53 53 4 39 53 47 14 52 34 34 - 3 0 0 53 15 48 2 16 21 51 197 -32 53 21 55 53 9 41 53 52 15 52 39 38 - 2 0 0 53 20 37 2 16 12 50 199 -32 53 26 44 53 14 31 53 57 2 52 44 29 - 1 0 0 53 25 13 2 16 2 50 200 -31 53 31 20 53 19 8 54 1 37 52 49 7 0 0 0 53 29 37 2 15 52 50 202 -31 53 35 43 53 23 31 54 5 59 52 53 32 1 0 0 53 33 47 2 15 43 49 203 -31 53 39 53 53 27 42 54 10 8 52 57 44 2 0 0 53 37 45 2 15 33 49 204 -30 53 43 51 53 31 40 54 14 4 53 1 43 3 0 0 53 41 30 2 15 24 49 206 -30 53 47 35 53 35 25 54 17 47 53 5 29 4 0 0 53 45 2 2 15 15 49 207 -29 53 51 7 53 38 57 54 21 18 53 9 2 5 0 0 53 48 20 2 15 5 48 208 -29 53 54 25 53 42 16 54 24 35 53 12 22 6 0 0 53 51 27 2 14 56 48 210 -28 53 57 31 53 45 22 54 27 40 53 15 30 7 0 0 53 54 20 2 14 47 48 211 -28 54 0 24 53 48 16 54 30 32 53 18 24 8 0 0 53 57 0 2 14 38 47 212 -27 54 3 5 53 50 56 54 33 12 53 21 5 9 0 0 53 59 28 2 14 29 47 213 -27 54 5 32 53 53 24 54 35 38 53 23 34 10 0 0 54 1 42 2 14 20 47 215 -26 54 7 46 53 55 39 54 37 52 53 25 49 11 0 0 54 3 44 2 14 11 46 216 -26 54 9 48 53 57 41 54 39 53 53 27 52 12 0 0 54 5 33 2 14 2 46 217 -25 54 11 37 53 59 30 54 41 41 53 29 42 13 0 0 54 7 9 2 13 53 45 218 -25 54 13 13 54 1 6 54 43 16 53 31 19 14 0 0 54 8 33 2 13 45 45 220 -24 54 14 36 54 2 29 54 44 39 53 32 43 15 0 0 54 9 43 2 13 36 45 221 -24 54 15 46 54 3 40 54 45 49 53 33 54 16 0 0 54 10 41 2 13 27 44 222 -23 54 16 44 54 4 38 54 46 46 53 34 52 17 0 0 54 11 25 2 13 19 44 223 -23 54 17 28 54 5 22 54 47 30 53 35 37 18 0 0 54 11 57 2 13 10 44 224 -22 54 18 0 54 5 54 54 48 2 53 36 9 19 0 0 54 12 16 2 13 2 43 226 -22 54 18 19 54 6 13 54 48 20 53 36 28 20 0 0 54 12 22 2 12 54 43 227 -21 54 18 25 54 6 19 54 48 26 53 36 35 21 0 0 54 12 15 2 12 45 42 228 -21 54 18 18 54 6 13 54 48 19 53 36 28 22 0 0 54 11 56 2 12 37 42 229 -20 54 17 59 54 5 53 54 47 59 53 36 8 23 0 0 54 11 23 2 12 29 42 230 -20 54 17 26 54 5 20 54 47 27 53 35 36 24 0 0 54 10 37 2 12 21 41 231 -19 54 16 41 54 4 35 54 46 41 53 34 50 25 0 0 54 9 39 2 12 13 41 232 -19 54 15 42 54 3 36 54 45 43 53 33 51 26 0 0 54 8 27 2 12 5 40 233 -18 54 14 31 54 2 25 54 44 32 53 32 40 27 0 0 54 7 3 2 11 57 40 234 -18 54 13 6 54 1 0 54 43 8 53 31 15 28 0 0 54 5 26 2 11 49 39 236 -17 54 11 29 53 59 23 54 41 31 53 29 37 29 0 0 54 3 35 2 11 41 39 237 -17 54 9 39 53 57 32 54 39 41 53 27 46 30 0 0 54 1 32 2 11 33 38 238 -16 54 7 35 53 55 29 54 37 38 53 25 42 31 0 0 53 59 15 2 11 26 38 239 -16 54 5 19 53 53 12 54 35 22 53 23 25 32 0 0 53 56 45 2 11 18 37 240 -15 54 2 49 53 50 42 54 32 53 53 20 55 33 0 0 53 54 3 2 11 11 37 241 -15 54 0 7 53 47 59 54 30 11 53 18 11 34 0 0 53 51 7 2 11 3 37 242 -14 53 57 11 53 45 3 54 27 16 53 15 15 35 0 0 53 47 58 2 10 56 36 243 -14 53 54 2 53 41 54 54 24 8 53 12 5 36 0 0 53 44 36 2 10 48 36 244 -13 53 50 40 53 38 32 54 20 47 53 8 41 37 0 0 53 41 0 2 10 41 35 245 -13 53 47 5 53 34 56 54 17 12 53 5 5 38 0 0 53 37 12 2 10 34 35 246 -12 53 43 16 53 31 7 54 13 25 53 1 15 39 0 0 53 33 10 2 10 27 34 247 -11 53 39 14 53 27 5 54 9 24 52 57 12 40 0 0 53 28 54 2 10 20 34 248 -11 53 34 59 53 22 50 54 5 10 52 52 56 41 0 0 53 24 26 2 10 13 33 249 -10 53 30 31 53 18 21 54 0 42 52 48 26 42 0 0 53 19 44 2 10 6 33 250 -10 53 25 49 53 13 39 53 56 2 52 43 42 43 0 0 53 14 48 2 9 59 32 251 -9 53 20 54 53 8 43 53 51 8 52 38 45 44 0 0 53 9 39 2 9 52 31 252 -9 53 15 45 53 3 34 53 46 1 52 33 35 45 0 0 53 4 17 2 9 46 31 252 -8 53 10 23 52 58 11 53 40 40 52 28 11 46 0 0 52 58 41 2 9 39 30 253 -8 53 4 48 52 52 35 53 35 6 52 22 34 47 0 0 52 52 52 2 9 33 30 254 -7 52 58 58 52 46 45 53 29 18 52 16 43 48 0 0 52 46 49 2 9 26 29 255 -6 52 52 56 52 40 42 53 23 17 52 10 38 49 0 0 52 40 32 2 9 20 29 256 -6 52 46 39 52 34 25 53 17 2 52 4 19 50 0 0 52 34 2 2 9 14 28 257 -5 52 40 9 52 27 54 53 10 33 51 57 47 51 0 0 52 27 18 2 9 8 28 258 -5 52 33 26 52 21 10 53 3 51 51 51 1 52 0 0 52 20 20 2 9 1 27 259 -4 52 26 28 52 14 12 52 56 56 51 44 2 53 0 0 52 13 8 2 8 55 27 260 -3 52 19 17 52 7 0 52 49 46 51 36 48 54 0 0 52 5 43 2 8 50 26 261 -3 52 11 52 51 59 34 52 42 23 51 29 21 55 0 0 51 58 4 2 8 44 25 261 -2 52 4 13 51 51 55 52 34 46 51 21 40 56 0 0 51 50 11 2 8 38 25 262 -2 51 56 21 51 44 2 52 26 55 51 13 44 57 0 0 51 42 4 2 8 32 24 263 -1 51 48 14 51 35 54 52 18 50 51 5 35 58 0 0 51 33 43 2 8 27 24 264 0 51 39 54 51 27 33 52 10 32 50 57 12 Uncertainty in time = +/- 10 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: TYC 0628-00415-1 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 51 25.6303 DE: +14 42 36.089 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .024 ) * V mag [mag]: 11.2 * B mag [mag]: 11.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2509) Chukotka approx. diameter [km]: 18 approx. diameter ["]: .022 distance from Earth [AU]: 1.14100 * orbital information: orbit source: Preston date of fit: 2012 Sep 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1140 number of rejected observations: 8 time covered by the observations: 1954 Aug 27 - 2012 Sep 14 1 sigma uncertainty ellipse (major, minor, PA): 0.072, 0.048, 68° remarks: * orbital elements for (2509) Chukotka : Mean anomaly = 32.52317432 deg Arg. of pericenter = 348.54792981 deg Long. of node = 343.74735913 deg Inclination = 2.84903380 deg Eccentricity = 0.19240110 Semimajor axis = 2.45625357 AU Perihelion dist = 1.98366769 AU Mag: H = 12.69, G = 0.15 Epoch of elements : MJD 56199.09700000 TDT (2012 Sep 29.097) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 29 2509 Chukotka 2h 20.0m UT 11.2 1 51 25.630 14 42 36.09TYC 0628-00415-1 11.7 15.2 18 2.9 1.141 -1.892 -4.63 -15.3982 14.713 142.58 -2.52 2.3333 -0.09861 0.58510 -3.56022 -0.59905 -0.00200 -0.00103 2000 30.1940512012 920.00000348.547930343.747359 2.8490340.19240110 2.4562536 1.983667712.6 5.00.15 RATE 2.5603200 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.076 0.053 70 3.47 0.054 0 0 3-1 056197.0020120929_0415-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 26, 21:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org