IOTA/IOTA-ES occultation update for (342) Endymion / TYC 0256-00372-1 event on 2009 Jun 06, 17:14 UT Visible from Summary ------- On 2009 Jun 06 UT, the 61 km diameter asteroid (342) Endymion will occult a 10.4 mag star in the constellation Sextans for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.8 mag to 15.2 mag (the magnitude of the asteroid) for at most 2.8 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: 80 * date and approx. time of event: 2009 Jun 06, 17:15 - 2009 Jun 06, 17:19 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 4.8 * estimated maximum duration [s]: 2.8 * Moon: 99 % sunlit, 85° distance * Sun: 83° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 69 * 1 sigma uncertainty interval [path widths]: +/- 0.68 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .024", 101° ) * approx speed of asteroid's shadow [km/s]: 21.9733 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0256-00372-1 by 342 Endymion on 2009 Jun 6 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 1 0 0 -24 37 31 17 15 17 63 8 -1 -24 56 42 -24 18 23 -25 22 53 -23 52 28 2 0 0 -24 50 51 17 15 21 62 5 -2 -25 10 2 -24 31 43 -25 36 14 -24 5 47 3 0 0 -25 4 14 17 15 26 62 3 -3 -25 23 25 -24 45 6 -25 49 37 -24 19 10 4 0 0 -25 17 39 17 15 31 62 1 -4 -25 36 50 -24 58 30 -26 3 2 -24 32 34 5 0 0 -25 31 6 17 15 36 62 359 -5 -25 50 17 -25 11 57 -26 16 30 -24 46 0 6 0 0 -25 44 34 17 15 41 62 357 -6 -26 3 46 -25 25 25 -26 29 59 -24 59 28 7 0 0 -25 58 4 17 15 45 61 354 -7 -26 17 16 -25 38 55 -26 43 29 -25 12 58 8 0 0 -26 11 35 17 15 50 61 352 -7 -26 30 47 -25 52 26 -26 57 0 -25 26 29 9 0 0 -26 25 7 17 15 55 61 350 -8 -26 44 19 -26 5 57 -27 10 32 -25 40 0 10 0 0 -26 38 39 17 15 59 60 348 -9 -26 57 51 -26 19 29 -27 24 4 -25 53 32 11 0 0 -26 52 11 17 16 4 60 347 -10 -27 11 24 -26 33 2 -27 37 37 -26 7 4 12 0 0 -27 5 43 17 16 9 59 345 -11 -27 24 56 -26 46 34 -27 51 9 -26 20 36 13 0 0 -27 19 15 17 16 13 59 343 -12 -27 38 27 -27 0 5 -28 4 41 -26 34 8 14 0 0 -27 32 46 17 16 18 58 341 -13 -27 51 58 -27 13 36 -28 18 12 -26 47 38 15 0 0 -27 46 15 17 16 22 58 339 -14 -28 5 28 -27 27 6 -28 31 41 -27 1 8 16 0 0 -27 59 44 17 16 27 57 338 -15 -28 18 57 -27 40 35 -28 45 10 -27 14 37 17 0 0 -28 13 11 17 16 31 57 336 -16 -28 32 24 -27 54 2 -28 58 37 -27 28 4 18 0 0 -28 26 36 17 16 36 56 334 -17 -28 45 48 -28 7 27 -29 12 1 -27 41 29 19 0 0 -28 39 59 17 16 40 56 333 -18 -28 59 11 -28 20 50 -29 25 24 -27 54 53 20 0 0 -28 53 19 17 16 44 55 331 -19 -29 12 32 -28 34 10 -29 38 44 -28 8 13 21 0 0 -29 6 37 17 16 48 54 330 -20 -29 25 49 -28 47 28 -29 52 1 -28 21 31 22 0 0 -29 19 52 17 16 53 54 329 -20 -29 39 4 -29 0 43 -30 5 16 -28 34 47 23 0 0 -29 33 3 17 16 57 53 327 -21 -29 52 15 -29 13 55 -30 18 27 -28 47 58 24 0 0 -29 46 11 17 17 1 52 326 -22 -30 5 22 -29 27 3 -30 31 34 -29 1 7 25 0 0 -29 59 15 17 17 5 52 325 -23 -30 18 26 -29 40 7 -30 44 37 -29 14 12 26 0 0 -30 12 15 17 17 9 51 323 -24 -30 31 26 -29 53 8 -30 57 37 -29 27 12 27 0 0 -30 25 11 17 17 13 50 322 -25 -30 44 22 -30 6 4 -31 10 32 -29 40 9 28 0 0 -30 38 2 17 17 17 50 321 -26 -30 57 13 -30 18 55 -31 23 22 -29 53 1 29 0 0 -30 50 49 17 17 21 49 320 -27 -31 9 59 -30 31 42 -31 36 8 -30 5 48 30 0 0 -31 3 30 17 17 25 48 319 -28 -31 22 40 -30 44 24 -31 48 49 -30 18 30 31 0 0 -31 16 6 17 17 29 47 318 -29 -31 35 15 -30 57 0 -32 1 24 -30 31 7 32 0 0 -31 28 37 17 17 32 47 317 -29 -31 47 46 -31 9 31 -32 13 54 -30 43 39 33 0 0 -31 41 2 17 17 36 46 316 -30 -32 0 10 -31 21 57 -32 26 18 -30 56 4 34 0 0 -31 53 21 17 17 40 45 315 -31 -32 12 29 -31 34 16 -32 38 35 -31 8 24 35 0 0 -32 5 33 17 17 43 44 314 -32 -32 24 41 -31 46 29 -32 50 47 -31 20 38 36 0 0 -32 17 40 17 17 47 44 313 -33 -32 36 47 -31 58 36 -33 2 53 -31 32 46 37 0 0 -32 29 40 17 17 50 43 312 -34 -32 48 46 -32 10 36 -33 14 51 -31 44 46 38 0 0 -32 41 33 17 17 53 42 311 -35 -33 0 39 -32 22 30 -33 26 43 -31 56 41 39 0 0 -32 53 19 17 17 57 41 310 -36 -33 12 24 -32 34 16 -33 38 28 -32 8 28 40 0 0 -33 4 58 17 18 0 41 309 -36 -33 24 3 -32 45 56 -33 50 6 -32 20 8 41 0 0 -33 16 29 17 18 3 40 308 -37 -33 35 34 -32 57 28 -34 1 36 -32 31 41 42 0 0 -33 27 53 17 18 6 39 307 -38 -33 46 57 -33 8 52 -34 12 59 -32 43 6 43 0 0 -33 39 9 17 18 9 38 306 -39 -33 58 13 -33 20 9 -34 24 14 -32 54 23 44 0 0 -33 50 18 17 18 12 37 306 -40 -34 9 21 -33 31 18 -34 35 21 -33 5 33 45 0 0 -34 1 18 17 18 15 37 305 -41 -34 20 20 -33 42 19 -34 46 20 -33 16 35 46 0 0 -34 12 10 17 18 18 36 304 -42 -34 31 12 -33 53 11 -34 57 10 -33 27 28 47 0 0 -34 22 54 17 18 21 35 303 -42 -34 41 55 -34 3 56 -35 7 53 -33 38 13 48 0 0 -34 33 29 17 18 24 34 302 -43 -34 52 30 -34 14 31 -35 18 26 -33 48 50 49 0 0 -34 43 55 17 18 27 33 302 -44 -35 2 55 -34 24 58 -35 28 51 -33 59 18 50 0 0 -34 54 13 17 18 29 33 301 -45 -35 13 12 -34 35 17 -35 39 7 -34 9 37 51 0 0 -35 4 22 17 18 32 32 300 -46 -35 23 20 -34 45 26 -35 49 15 -34 19 47 52 0 0 -35 14 21 17 18 34 31 299 -47 -35 33 19 -34 55 26 -35 59 13 -34 29 48 53 0 0 -35 24 11 17 18 37 30 299 -47 -35 43 9 -35 5 17 -36 9 2 -34 39 39 54 0 0 -35 33 52 17 18 39 29 298 -48 -35 52 49 -35 14 59 -36 18 41 -34 49 22 55 0 0 -35 43 24 17 18 41 29 297 -49 -36 2 20 -35 24 31 -36 28 11 -34 58 55 56 0 0 -35 52 46 17 18 44 28 296 -50 -36 11 42 -35 33 53 -36 37 31 -35 8 18 57 0 0 -36 1 58 17 18 46 27 296 -51 -36 20 53 -35 43 6 -36 46 42 -35 17 32 58 0 0 -36 11 0 17 18 48 26 295 -51 -36 29 55 -35 52 9 -36 55 43 -35 26 35 59 0 0 -36 19 53 17 18 50 25 294 -52 -36 38 47 -36 1 2 -37 4 34 -35 35 29 60 0 0 -36 28 35 17 18 52 25 294 -53 -36 47 28 -36 9 45 -37 13 15 -35 44 13 61 0 0 -36 37 7 17 18 54 24 293 -54 -36 56 0 -36 18 18 -37 21 46 -35 52 47 62 0 0 -36 45 29 17 18 56 23 292 -54 -37 4 21 -36 26 41 -37 30 6 -36 1 10 63 0 0 -36 53 41 17 18 58 22 292 -55 -37 12 33 -36 34 53 -37 38 17 -36 9 24 64 0 0 -37 1 43 17 18 59 21 291 -56 -37 20 33 -36 42 55 -37 46 16 -36 17 26 65 0 0 -37 9 33 17 19 1 21 290 -57 -37 28 24 -36 50 46 -37 54 6 -36 25 19 66 0 0 -37 17 14 17 19 3 20 290 -57 -37 36 3 -36 58 27 -38 1 45 -36 33 1 67 0 0 -37 24 44 17 19 4 19 289 -58 -37 43 33 -37 5 58 -38 9 13 -36 40 32 68 0 0 -37 32 3 17 19 6 18 288 -59 -37 50 51 -37 13 17 -38 16 31 -36 47 52 69 0 0 -37 39 11 17 19 7 17 288 -60 -37 57 59 -37 20 26 -38 23 38 -36 55 2 70 0 0 -37 46 9 17 19 8 17 287 -60 -38 4 56 -37 27 24 -38 30 34 -37 2 1 71 0 0 -37 52 55 17 19 10 16 286 -61 -38 11 42 -37 34 12 -38 37 19 -37 8 49 72 0 0 -37 59 31 17 19 11 15 286 -62 -38 18 17 -37 40 48 -38 43 54 -37 15 26 73 0 0 -38 5 56 17 19 12 14 285 -62 -38 24 41 -37 47 13 -38 50 17 -37 21 52 74 0 0 -38 12 9 17 19 13 13 284 -63 -38 30 54 -37 53 27 -38 56 30 -37 28 7 75 0 0 -38 18 12 17 19 14 13 284 -64 -38 36 57 -37 59 31 -39 2 31 -37 34 10 76 0 0 -38 24 3 17 19 15 12 283 -64 -38 42 47 -38 5 22 -39 8 21 -37 40 3 77 0 0 -38 29 44 17 19 16 11 283 -65 -38 48 27 -38 11 3 -39 14 0 -37 45 44 78 0 0 -38 35 13 17 19 17 10 282 -65 -38 53 56 -38 16 33 -39 19 28 -37 51 15 79 0 0 -38 40 31 17 19 18 10 281 -66 -38 59 13 -38 21 51 -39 24 45 -37 56 33 80 0 0 -38 45 37 17 19 18 9 281 -67 -39 4 19 -38 26 58 -39 29 51 -38 1 41 81 0 0 -38 50 32 17 19 19 8 280 -67 -39 9 14 -38 31 54 -39 34 45 -38 6 37 82 0 0 -38 55 16 17 19 20 7 279 -68 -39 13 57 -38 36 38 -39 39 28 -38 11 22 83 0 0 -38 59 49 17 19 20 6 279 -68 -39 18 29 -38 41 11 -39 43 59 -38 15 55 84 0 0 -39 4 10 17 19 21 6 278 -69 -39 22 50 -38 45 32 -39 48 19 -38 20 17 85 0 0 -39 8 19 17 19 21 5 277 -69 -39 26 59 -38 49 42 -39 52 28 -38 24 28 86 0 0 -39 12 17 17 19 21 4 277 -70 -39 30 57 -38 53 41 -39 56 25 -38 28 27 87 0 0 -39 16 4 17 19 22 3 276 -70 -39 34 43 -38 57 28 -40 0 11 -38 32 14 88 0 0 -39 19 39 17 19 22 2 276 -71 -39 38 18 -39 1 3 -40 3 45 -38 35 50 89 0 0 -39 23 3 17 19 22 2 275 -71 -39 41 41 -39 4 27 -40 7 8 -38 39 14 90 0 0 -39 26 15 17 19 22 1 274 -71 -39 44 53 -39 7 39 -40 10 20 -38 42 27 91 0 0 -39 29 15 17 19 22 0 274 -72 -39 47 53 -39 10 40 -40 13 19 -38 45 28 Uncertainty in time = +/- 2 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 0256-00372-1 * constellation : Sextans * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 33 40.7424 DE: +02 46 46.290 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .022 ) * V mag [mag]: 10.4 * B mag [mag]: 10.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (342) Endymion approx. diameter [km]: 61 approx. diameter ["]: .035 distance from Earth [AU]: 2.40600 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 825 number of rejected observations: 69 time covered by the observations: 1900 Sep 29 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.010, 109° remarks: * orbital elements for (342) Endymion : Mean anomaly = 70.23050794 deg Arg. of pericenter = 225.18007998 deg Long. of node = 232.73615309 deg Inclination = 7.34529395 deg Eccentricity = 0.12899464 Semimajor axis = 2.56854808 AU Perihelion dist = 2.23721915 AU Mag: H = 10.12, G = 0.15 Epoch of elements : MJD 54988.71900000 TDT (2009 Jun 06.719) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 6 342 Endymion 17h 15.1m UT 10.4 10 33 40.742 2 46 46.29TYC 0256-00372-1 10.7 15.2 61 2.8 2.406 2.958 -9.46 4.4022 2.782 -79.08 22.72 17.2512 -0.09666 -0.44804 12.12943 -2.58739 0.00498 -0.00206 2000 68.1429472009 529.00000225.180080232.736153 7.3452940.12899464 2.5685481 2.237219110.2 5.00.15 RATE 2.3942670 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.024 101 1.68 0.024 0 54581.5020090606_0372-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 07:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org