IOTA/IOTA-ES occultation update for (164) Eva / TYC 0642-00211-1 event on 2010 Feb 12, 18:09 UT Visible from Russia, Europe, N Africa Summary ------- On 2010 Feb 12 UT, the 105 km diameter asteroid (164) Eva will occult a 10.4 mag star in the constellation Aries for observers along a path across Russia, Europe, N Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 13.2 mag (the magnitude of the asteroid) for at most 3.7 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: 2010 Feb 12, 18:10 - 2010 Feb 12, 18:13 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 3.7 * Moon: 2 % sunlit, 93° distance * Sun: 78° distance * rough path description: Russia, Europe, N Africa The occultation path -------------------- * approximate projected width [km]: 105 * 1 sigma uncertainty interval [path widths]: +/- 0.38 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .026", 80° ) * approx speed of asteroid's shadow [km/s]: 28.4741 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0642-00211-1 by 164 Eva on 2010 Feb 12 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 ' " Longitude Longitude Longitude Longitude Latitude Latitude Latitude Latitude - 4 0 0 22 45 13 18 10 40 76 226 -1 22 10 2 23 20 24 21 43 19 23 47 9 - 3 0 0 23 25 16 18 10 44 75 227 -2 22 50 15 24 0 17 22 23 39 24 26 55 - 2 0 0 24 4 34 18 10 48 73 228 -3 23 29 44 24 39 26 23 3 15 25 5 55 - 1 0 0 24 43 8 18 10 52 72 229 -4 24 8 27 25 17 49 23 42 6 25 44 11 0 0 0 25 20 56 18 10 57 71 230 -5 24 46 26 25 55 27 24 20 12 26 21 42 1 0 0 25 57 59 18 11 1 70 231 -6 25 23 38 26 32 20 24 57 33 26 58 26 2 0 0 26 34 16 18 11 5 69 231 -7 26 0 6 27 8 26 25 34 8 27 34 25 3 0 0 27 9 47 18 11 9 68 232 -8 26 35 47 27 43 47 26 9 57 28 9 39 4 0 0 27 44 32 18 11 12 67 233 -9 27 10 43 28 18 22 26 45 1 28 44 6 5 0 0 28 18 32 18 11 16 66 233 -10 27 44 52 28 52 12 27 19 18 29 17 47 6 0 0 28 51 45 18 11 20 65 234 -11 28 18 16 29 25 15 27 52 49 29 50 43 7 0 0 29 24 13 18 11 24 64 235 -12 28 50 54 29 57 32 28 25 35 30 22 53 8 0 0 29 55 55 18 11 27 63 235 -13 29 22 46 30 29 4 28 57 35 30 54 17 9 0 0 30 26 52 18 11 31 62 236 -14 29 53 53 30 59 51 29 28 49 31 24 56 10 0 0 30 57 3 18 11 34 61 237 -15 30 24 15 31 29 53 29 59 18 31 54 50 11 0 0 31 26 30 18 11 38 60 237 -16 30 53 51 31 59 9 30 29 2 32 23 59 12 0 0 31 55 12 18 11 41 59 238 -17 31 22 43 32 27 41 30 58 1 32 52 24 13 0 0 32 23 9 18 11 44 58 239 -18 31 50 50 32 55 29 31 26 16 33 20 4 14 0 0 32 50 23 18 11 47 57 239 -18 32 18 13 33 22 33 31 53 46 33 47 1 15 0 0 33 16 52 18 11 50 56 240 -19 32 44 52 33 48 54 32 20 32 34 13 14 16 0 0 33 42 39 18 11 53 55 240 -20 33 10 48 34 14 31 32 46 35 34 38 44 17 0 0 34 7 42 18 11 56 54 241 -21 33 36 0 34 39 25 33 11 55 35 3 32 18 0 0 34 32 4 18 11 59 53 242 -22 34 0 30 35 3 37 33 36 32 35 27 37 19 0 0 34 55 43 18 12 2 52 242 -23 34 24 18 35 27 8 34 0 26 35 51 1 20 0 0 35 18 40 18 12 5 51 243 -24 34 47 24 35 49 56 34 23 38 36 13 43 21 0 0 35 40 56 18 12 8 50 244 -24 35 9 48 36 12 4 34 46 9 36 35 44 22 0 0 36 2 31 18 12 10 49 244 -25 35 31 32 36 33 31 35 7 59 36 57 5 23 0 0 36 23 26 18 12 13 49 245 -26 35 52 35 36 54 18 35 29 8 37 17 46 24 0 0 36 43 41 18 12 16 48 246 -27 36 12 58 37 14 25 35 49 37 37 37 47 25 0 0 37 3 17 18 12 18 47 246 -28 36 32 41 37 33 53 36 9 26 37 57 9 26 0 0 37 22 14 18 12 21 46 247 -28 36 51 45 37 52 42 36 28 36 38 15 52 27 0 0 37 40 31 18 12 23 45 247 -29 37 10 11 38 10 53 36 47 7 38 33 57 28 0 0 37 58 11 18 12 25 44 248 -30 37 27 57 38 28 26 37 4 59 38 51 25 29 0 0 38 15 13 18 12 28 43 249 -31 37 45 6 38 45 21 37 22 13 39 8 15 30 0 0 38 31 38 18 12 30 43 249 -31 38 1 38 39 1 39 37 38 50 39 24 28 31 0 0 38 47 26 18 12 32 42 250 -32 38 17 32 39 17 20 37 54 49 39 40 4 32 0 0 39 2 37 18 12 34 41 251 -33 38 32 50 39 32 25 38 10 11 39 55 5 33 0 0 39 17 12 18 12 36 40 251 -34 38 47 31 39 46 54 38 24 57 40 9 29 34 0 0 39 31 12 18 12 38 39 252 -34 39 1 36 40 0 48 38 39 7 40 23 18 35 0 0 39 44 36 18 12 40 38 253 -35 39 15 6 40 14 7 38 52 41 40 36 33 36 0 0 39 57 25 18 12 42 38 253 -36 39 28 1 40 26 50 39 5 40 40 49 12 37 0 0 40 9 40 18 12 44 37 254 -36 39 40 20 40 39 0 39 18 3 41 1 18 38 0 0 40 21 20 18 12 46 36 255 -37 39 52 5 40 50 35 39 29 52 41 12 49 39 0 0 40 32 26 18 12 48 35 255 -38 40 3 16 41 1 37 39 41 7 41 23 47 40 0 0 40 42 59 18 12 49 34 256 -39 40 13 53 41 12 5 39 51 47 41 34 12 41 0 0 40 52 58 18 12 51 34 257 -39 40 23 57 41 22 0 40 1 54 41 44 4 42 0 0 41 2 24 18 12 53 33 257 -40 40 33 27 41 31 22 40 11 27 41 53 23 43 0 0 41 11 18 18 12 54 32 258 -41 40 42 24 41 40 12 40 20 27 42 2 10 44 0 0 41 19 39 18 12 56 31 259 -41 40 50 49 41 48 29 40 28 54 42 10 24 45 0 0 41 27 27 18 12 58 31 259 -42 40 58 41 41 56 14 40 36 49 42 18 7 46 0 0 41 34 44 18 12 59 30 260 -43 41 6 1 42 3 27 40 44 11 42 25 18 47 0 0 41 41 29 18 13 1 29 261 -43 41 12 48 42 10 9 40 51 1 42 31 57 48 0 0 41 47 42 18 13 2 28 261 -44 41 19 4 42 16 20 40 57 19 42 38 6 49 0 0 41 53 23 18 13 3 28 262 -44 41 24 48 42 21 59 41 3 5 42 43 43 50 0 0 41 58 34 18 13 5 27 263 -45 41 30 1 42 27 7 41 8 19 42 48 50 51 0 0 42 3 13 18 13 6 26 263 -46 41 34 42 42 31 45 41 13 2 42 53 25 52 0 0 42 7 22 18 13 7 25 264 -46 41 38 53 42 35 51 41 17 14 42 57 31 53 0 0 42 10 59 18 13 9 25 265 -47 41 42 32 42 39 27 41 20 54 43 1 6 54 0 0 42 14 6 18 13 10 24 265 -48 41 45 40 42 42 33 41 24 4 43 4 10 55 0 0 42 16 43 18 13 11 23 266 -48 41 48 18 42 45 8 41 26 42 43 6 44 56 0 0 42 18 48 18 13 12 22 267 -49 41 50 24 42 47 13 41 28 49 43 8 49 57 0 0 42 20 24 18 13 13 22 267 -49 41 52 1 42 48 48 41 30 26 43 10 23 58 0 0 42 21 29 18 13 14 21 268 -50 41 53 6 42 49 52 41 31 32 43 11 27 59 0 0 42 22 4 18 13 15 20 269 -51 41 53 41 42 50 27 41 32 7 43 12 2 60 0 0 42 22 8 18 13 16 19 269 -51 41 53 46 42 50 31 41 32 12 43 12 6 61 0 0 42 21 42 18 13 17 19 270 -52 41 53 20 42 50 6 41 31 46 43 11 41 62 0 0 42 20 46 18 13 18 18 271 -52 41 52 23 42 49 10 41 30 49 43 10 45 63 0 0 42 19 20 18 13 19 17 272 -53 41 50 56 42 47 44 41 29 21 43 9 20 64 0 0 42 17 23 18 13 20 16 272 -53 41 48 59 42 45 49 41 27 23 43 7 25 65 0 0 42 14 56 18 13 21 16 273 -54 41 46 31 42 43 23 41 24 54 43 5 0 66 0 0 42 11 59 18 13 21 15 274 -55 41 43 32 42 40 27 41 21 55 43 2 5 67 0 0 42 8 31 18 13 22 14 274 -55 41 40 3 42 37 0 41 18 24 42 58 40 68 0 0 42 4 33 18 13 23 13 275 -56 41 36 2 42 33 4 41 14 23 42 54 44 69 0 0 42 0 4 18 13 23 13 276 -56 41 31 31 42 28 36 41 9 50 42 50 19 70 0 0 41 55 4 18 13 24 12 276 -57 41 26 29 42 23 39 41 4 46 42 45 22 71 0 0 41 49 33 18 13 25 11 277 -57 41 20 56 42 18 10 40 59 11 42 39 56 72 0 0 41 43 31 18 13 25 10 278 -58 41 14 52 42 12 11 40 53 5 42 33 59 73 0 0 41 36 58 18 13 26 10 278 -58 41 8 16 42 5 41 40 46 27 42 27 31 74 0 0 41 29 54 18 13 26 9 279 -59 41 1 8 41 58 40 40 39 17 42 20 32 75 0 0 41 22 18 18 13 27 8 280 -59 40 53 29 41 51 7 40 31 36 42 13 1 76 0 0 41 14 10 18 13 27 7 280 -60 40 45 18 41 43 3 40 23 22 42 5 0 77 0 0 41 5 30 18 13 27 7 281 -60 40 36 35 41 34 27 40 14 36 41 56 27 78 0 0 40 56 19 18 13 28 6 282 -61 40 27 19 41 25 19 40 5 17 41 47 22 79 0 0 40 46 34 18 13 28 5 282 -61 40 17 31 41 15 39 39 55 26 41 37 45 80 0 0 40 36 18 18 13 28 4 283 -62 40 7 10 41 5 26 39 45 1 41 27 36 81 0 0 40 25 28 18 13 28 3 283 -62 39 56 15 40 54 41 39 34 4 41 16 54 82 0 0 40 14 5 18 13 29 3 284 -62 39 44 48 40 43 23 39 22 32 41 5 39 83 0 0 40 2 9 18 13 29 2 285 -63 39 32 46 40 31 31 39 10 27 40 53 52 84 0 0 39 49 39 18 13 29 1 285 -63 39 20 11 40 19 7 38 57 48 40 41 31 85 0 0 39 36 35 18 13 29 0 286 -64 39 7 2 40 6 8 38 44 35 40 28 36 Uncertainty in time = +/- 2 secs Prediction of 2010 Feb 4.0 Data for the target star ------------------------ * name: TYC 0642-00211-1 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 43 06.1078 DE: +12 27 03.977 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .025 ) * V mag [mag]: 10.4 * B mag [mag]: 11.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (164) Eva approx. diameter [km]: 105 approx. diameter ["]: .072 distance from Earth [AU]: 2.01900 * orbital information: orbit source: Preston date of fit: 2010 Feb 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 788 number of rejected observations: 48 time covered by the observations: 1900 Mar 06 - 2010 Jan 14 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.009, 51° remarks: * orbital elements for (164) Eva : Mean anomaly = 35.79050990 deg Arg. of pericenter = 283.42595845 deg Long. of node = 77.13606325 deg Inclination = 24.47150193 deg Eccentricity = 0.34540725 Semimajor axis = 2.63236780 AU Perihelion dist = 1.72312888 AU Mag: H = 8.81, G = 0.15 Epoch of elements : MJD 55239.75700000 TDT (2010 Feb 12.757) ------ occelmnt file for Occult BEGIN ----------------------------------- 2010 Feb 12 164 Eva 18h 9.8m UT 10.4 2 43 6.108 12 27 3.98TYC 0642-00211-1 11.1 13.2 105 3.7 2.019 3.745 43.47 -14.3483 12.439 -88.88 -13.55 18.1626 -0.02252 0.02864 12.59409 9.98418 0.00519 0.00158 2000 33.5388622010 2 3.00000283.425958 77.136063 24.4715020.34540725 2.6323678 1.7231289 8.9 5.00.15 RATE 2.3077260 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.026 80 1.38 0.027 0 055231.0020100212_0211-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2010 Feb 03, 18:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org