IOTA/IOTA-ES occultation update for (38) Leda / TYC 2390-00492-1 event on 2009 Dec 02, 20:39 UT Visible from Summary ------- On 2009 Dec 02 UT, the 116 km diameter asteroid (38) Leda will occult a 11.1 mag star in the constellation Auriga for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 11.3 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: 99 * date and approx. time of event: 2009 Dec 02, 20:30 - 2009 Dec 02, 20:46 UT * magnitude of target star: 11.1 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 12.4 * Moon: 99 % sunlit, 5° distance * Sun: 168° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 165 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .024", 91° ) * approx speed of asteroid's shadow [km/s]: 9.3228 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2390-00492-1 by 38 Leda on 2009 Dec 2 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 6 10 12 -47 0 0 20 46 50 1 41 -12 4 41 46 7 39 21 ... .. .. 8 18 49 7 27 10 -46 0 0 20 46 49 2 40 -14 5 59 42 8 55 23 5 21 26 9 34 27 8 44 5 -45 0 0 20 46 48 3 39 -15 7 17 28 10 11 30 6 39 35 10 50 13 10 1 5 -44 0 0 20 46 47 5 38 -16 8 35 12 11 27 47 7 57 40 12 6 12 11 18 16 -43 0 0 20 46 44 6 37 -18 9 53 1 12 44 21 9 15 46 13 22 32 12 35 45 -42 0 0 20 46 42 7 36 -19 11 11 3 14 1 21 10 34 3 14 39 19 13 53 39 -41 0 0 20 46 38 9 35 -20 12 29 23 15 18 52 11 52 36 15 56 41 15 12 6 -40 0 0 20 46 35 10 35 -22 13 48 10 16 37 2 13 11 32 17 14 44 16 31 13 -39 0 0 20 46 30 12 34 -23 15 7 31 17 55 57 14 31 0 18 33 36 17 51 6 -38 0 0 20 46 25 13 33 -25 16 27 32 19 15 46 15 51 6 19 53 24 19 11 54 -37 0 0 20 46 19 14 32 -26 17 48 22 20 36 36 17 11 57 21 14 16 20 33 45 -36 0 0 20 46 13 16 31 -27 19 10 7 21 58 36 18 33 41 22 36 21 21 56 46 -35 0 0 20 46 6 17 30 -29 20 32 57 23 21 53 19 56 27 23 59 46 23 21 8 -34 0 0 20 45 58 19 29 -30 21 56 59 24 46 38 21 20 22 25 24 43 24 46 58 -33 0 0 20 45 49 20 28 -31 23 22 24 26 13 1 22 45 36 26 51 21 26 14 29 -32 0 0 20 45 40 22 27 -33 24 49 20 27 41 12 24 12 19 28 19 52 27 43 51 -31 0 0 20 45 29 23 26 -34 26 17 58 29 11 24 25 40 40 29 50 29 29 15 18 -30 0 0 20 45 18 24 25 -36 27 48 31 30 43 51 27 10 52 31 23 25 30 49 2 -29 0 0 20 45 7 26 24 -37 29 21 12 32 18 48 28 43 7 32 58 57 32 25 21 -28 0 0 20 44 54 27 23 -38 30 56 15 33 56 33 30 17 39 34 37 23 34 4 33 -27 0 0 20 44 40 29 22 -40 32 33 57 35 37 26 31 54 45 36 19 5 35 47 0 -26 0 0 20 44 25 30 20 -41 34 14 38 37 21 52 33 34 43 38 4 28 37 33 5 -25 0 0 20 44 9 32 19 -42 35 58 39 39 10 17 35 17 54 39 54 1 39 23 19 -24 0 0 20 43 52 33 17 -44 37 46 27 41 3 18 37 4 43 41 48 22 41 18 18 -23 0 0 20 43 33 35 16 -45 39 38 33 43 1 34 38 55 40 43 48 14 43 18 46 -22 0 0 20 43 13 36 14 -46 41 35 35 45 5 59 40 51 20 45 54 35 Latitude Latitude Latitude Latitude 44 0 0 -21 40 9 20 43 6 36 13 -46 -20 49 44 -22 31 25 -20 27 49 -22 54 16 45 0 0 -21 11 52 20 42 56 37 12 -47 -20 21 46 -22 2 49 -19 59 59 -22 25 31 46 0 0 -20 44 20 20 42 46 38 11 -47 -19 54 32 -21 34 57 -19 32 53 -21 57 30 47 0 0 -20 17 32 20 42 35 38 11 -48 -19 28 2 -21 7 50 -19 6 30 -21 30 15 48 0 0 -19 51 28 20 42 24 39 10 -48 -19 2 16 -20 41 29 -18 40 51 -21 3 45 49 0 0 -19 26 9 20 42 14 39 9 -49 -18 37 13 -20 15 52 -18 15 56 -20 38 1 50 0 0 -19 1 34 20 42 3 40 8 -49 -18 12 55 -19 51 1 -17 51 44 -20 13 2 51 0 0 -18 37 45 20 41 52 40 7 -49 -17 49 20 -19 26 55 -17 28 16 -19 48 48 52 0 0 -18 14 39 20 41 41 41 5 -49 -17 26 30 -19 3 34 -17 5 32 -19 25 20 53 0 0 -17 52 19 20 41 30 41 4 -50 -17 4 24 -18 40 58 -16 43 32 -19 2 37 54 0 0 -17 30 43 20 41 19 42 3 -50 -16 43 1 -18 19 8 -16 22 16 -18 40 40 55 0 0 -17 9 51 20 41 8 42 2 -50 -16 22 23 -17 58 2 -16 1 43 -18 19 29 56 0 0 -16 49 44 20 40 57 43 1 -50 -16 2 29 -17 37 42 -15 41 55 -17 59 2 57 0 0 -16 30 22 20 40 46 43 0 -50 -15 43 19 -17 18 7 -15 22 50 -17 39 22 58 0 0 -16 11 44 20 40 35 43 359 -50 -15 24 53 -16 59 17 -15 4 29 -17 20 26 59 0 0 -15 53 51 20 40 23 43 358 -50 -15 7 11 -16 41 12 -14 46 52 -17 2 16 60 0 0 -15 36 42 20 40 12 44 357 -50 -14 50 13 -16 23 52 -14 29 58 -16 44 51 61 0 0 -15 20 18 20 40 1 44 355 -50 -14 33 59 -16 7 17 -14 13 48 -16 28 11 62 0 0 -15 4 38 20 39 49 44 354 -50 -14 18 28 -15 51 27 -13 58 22 -16 12 16 63 0 0 -14 49 42 20 39 38 44 353 -50 -14 3 42 -15 36 22 -13 43 39 -15 57 7 64 0 0 -14 35 31 20 39 27 44 352 -50 -13 49 39 -15 22 1 -13 29 40 -15 42 42 65 0 0 -14 22 3 20 39 15 44 351 -50 -13 36 20 -15 8 25 -13 16 24 -15 29 2 66 0 0 -14 9 20 20 39 4 45 350 -50 -13 23 44 -14 55 34 -13 3 52 -15 16 8 67 0 0 -13 57 21 20 38 53 45 348 -49 -13 11 53 -14 43 28 -12 52 4 -15 3 58 68 0 0 -13 46 6 20 38 42 45 347 -49 -13 0 44 -14 32 6 -12 40 58 -14 52 33 69 0 0 -13 35 36 20 38 30 44 346 -49 -12 50 20 -14 21 29 -12 30 36 -14 41 52 70 0 0 -13 25 49 20 38 19 44 345 -48 -12 40 39 -14 11 36 -12 20 58 -14 31 57 71 0 0 -13 16 46 20 38 8 44 344 -48 -12 31 41 -14 2 27 -12 12 2 -14 22 46 72 0 0 -13 8 27 20 37 57 44 343 -48 -12 23 27 -13 54 3 -12 3 50 -14 14 20 73 0 0 -13 0 52 20 37 46 44 342 -47 -12 15 57 -13 46 24 -11 56 22 -14 6 38 74 0 0 -12 54 1 20 37 35 44 341 -47 -12 9 9 -13 39 29 -11 49 36 -13 59 41 75 0 0 -12 47 54 20 37 24 44 340 -46 -12 3 6 -13 33 18 -11 43 34 -13 53 29 76 0 0 -12 42 30 20 37 13 43 338 -46 -11 57 45 -13 27 51 -11 38 15 -13 48 1 77 0 0 -12 37 51 20 37 2 43 337 -45 -11 53 8 -13 23 9 -11 33 39 -13 43 17 78 0 0 -12 33 55 20 36 51 43 336 -45 -11 49 15 -13 19 12 -11 29 46 -13 39 19 79 0 0 -12 30 44 20 36 40 42 335 -44 -11 46 5 -13 15 58 -11 26 37 -13 36 5 80 0 0 -12 28 16 20 36 30 42 334 -44 -11 43 38 -13 13 30 -11 24 11 -13 33 35 81 0 0 -12 26 32 20 36 19 42 333 -43 -11 41 55 -13 11 45 -11 22 28 -13 31 51 82 0 0 -12 25 32 20 36 8 41 332 -42 -11 40 56 -13 10 45 -11 21 29 -13 30 51 83 0 0 -12 25 17 20 35 58 41 332 -42 -11 40 40 -13 10 30 -11 21 12 -13 30 35 84 0 0 -12 25 45 20 35 48 40 331 -41 -11 41 7 -13 10 59 -11 21 40 -13 31 5 85 0 0 -12 26 58 20 35 37 40 330 -40 -11 42 19 -13 12 12 -11 22 51 -13 32 19 86 0 0 -12 28 54 20 35 27 39 329 -40 -11 44 14 -13 14 11 -11 24 45 -13 34 18 87 0 0 -12 31 35 20 35 17 39 328 -39 -11 46 52 -13 16 54 -11 27 23 -13 37 2 88 0 0 -12 35 0 20 35 7 38 327 -38 -11 50 15 -13 20 22 -11 30 45 -13 40 31 89 0 0 -12 39 10 20 34 57 38 326 -37 -11 54 22 -13 24 35 -11 34 50 -13 44 46 90 0 0 -12 44 4 20 34 48 37 326 -37 -11 59 13 -13 29 33 -11 39 39 -13 49 45 91 0 0 -12 49 43 20 34 38 37 325 -36 -12 4 47 -13 35 16 -11 45 12 -13 55 30 92 0 0 -12 56 7 20 34 28 36 324 -35 -12 11 7 -13 41 44 -11 51 30 -14 2 0 93 0 0 -13 3 15 20 34 19 35 324 -34 -12 18 10 -13 48 58 -11 58 31 -14 9 16 94 0 0 -13 11 9 20 34 10 35 323 -33 -12 25 58 -13 56 57 -12 6 17 -14 17 18 95 0 0 -13 19 47 20 34 1 34 322 -33 -12 34 31 -14 5 41 -12 14 47 -14 26 5 96 0 0 -13 29 11 20 33 52 33 322 -32 -12 43 48 -14 15 12 -12 24 1 -14 35 39 97 0 0 -13 39 20 20 33 43 32 321 -31 -12 53 50 -14 25 28 -12 34 0 -14 45 58 98 0 0 -13 50 14 20 33 34 32 320 -30 -13 4 37 -14 36 30 -12 44 44 -14 57 4 99 0 0 -14 1 55 20 33 26 31 320 -29 -13 16 9 -14 48 19 -12 56 13 -15 8 56 100 0 0 -14 14 21 20 33 18 30 319 -28 -13 28 27 -15 0 53 -13 8 27 -15 21 35 101 0 0 -14 27 32 20 33 10 29 319 -27 -13 41 30 -15 14 15 -13 21 26 -15 35 1 102 0 0 -14 41 30 20 33 2 29 318 -27 -13 55 18 -15 28 22 -13 35 11 -15 49 13 103 0 0 -14 56 15 20 32 54 28 317 -26 -14 9 53 -15 43 17 -13 49 41 -16 4 12 104 0 0 -15 11 45 20 32 46 27 317 -25 -14 25 13 -15 58 59 -14 4 56 -16 19 59 105 0 0 -15 28 3 20 32 39 26 316 -24 -14 41 19 -16 15 28 -14 20 58 -16 36 33 106 0 0 -15 45 6 20 32 32 25 316 -23 -14 58 11 -16 32 44 -14 37 45 -16 53 55 107 0 0 -16 2 57 20 32 25 24 315 -22 -15 15 50 -16 50 47 -14 55 18 -17 12 4 108 0 0 -16 21 35 20 32 18 24 315 -21 -15 34 15 -17 9 38 -15 13 38 -17 31 1 109 0 0 -16 41 0 20 32 11 23 315 -20 -15 53 26 -17 29 17 -15 32 44 -17 50 47 110 0 0 -17 1 12 20 32 5 22 314 -19 -16 13 25 -17 49 44 -15 52 36 -18 11 20 111 0 0 -17 22 12 20 31 59 21 314 -18 -16 34 10 -18 10 59 -16 13 15 -18 32 42 112 0 0 -17 43 59 20 31 53 20 313 -17 -16 55 42 -18 33 2 -16 34 41 -18 54 52 113 0 0 -18 6 34 20 31 47 19 313 -16 -17 18 2 -18 55 54 -16 56 54 -19 17 51 114 0 0 -18 29 57 20 31 42 18 312 -15 -17 41 8 -19 19 34 -17 19 54 -19 41 39 115 0 0 -18 54 8 20 31 36 17 312 -14 -18 5 2 -19 44 2 -17 43 40 -20 6 15 116 0 0 -19 19 7 20 31 31 16 312 -13 -18 29 43 -20 9 19 -18 8 14 -20 31 41 117 0 0 -19 44 53 20 31 27 15 311 -12 -18 55 12 -20 35 25 -18 33 35 -20 57 55 118 0 0 -20 11 28 20 31 22 14 311 -11 -19 21 28 -21 2 19 -18 59 43 -21 24 59 119 0 0 -20 38 51 20 31 18 13 310 -10 -19 48 31 -21 30 3 -19 26 38 -21 52 52 120 0 0 -21 7 2 20 31 14 12 310 -9 -20 16 22 -21 58 35 -19 54 20 -22 21 33 121 0 0 -21 36 1 20 31 11 11 310 -8 -20 45 0 -22 27 56 -20 22 50 -22 51 4 122 0 0 -22 5 48 20 31 7 10 309 -7 -21 14 26 -22 58 5 -20 52 6 -23 21 24 123 0 0 -22 36 23 20 31 5 9 309 -6 -21 44 39 -23 29 3 -21 22 10 -23 52 33 124 0 0 -23 7 45 20 31 2 8 308 -5 -22 15 39 -24 0 50 -21 53 0 -24 24 30 125 0 0 -23 39 56 20 30 59 7 308 -4 -22 47 25 -24 33 25 -22 24 37 -24 57 17 126 0 0 -24 12 53 20 30 57 6 307 -3 -23 19 59 -25 6 48 -22 57 0 -25 30 51 127 0 0 -24 46 38 20 30 56 5 307 -2 -23 53 19 -25 40 59 -23 30 10 -26 5 14 128 0 0 -25 21 9 20 30 54 4 307 -1 -24 27 25 -26 15 57 -24 4 5 -26 40 25 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 2390-00492-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 15 26.4000 DE: +30 39 01.753 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .018 ) * V mag [mag]: 11.1 * B mag [mag]: 11.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (38) Leda approx. diameter [km]: 116 approx. diameter ["]: .115 distance from Earth [AU]: 1.38600 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 909 number of rejected observations: 109 time covered by the observations: 1904 Sep 19 - 2007 Jul 12 1 sigma uncertainty ellipse (major, minor, PA): 0.035, 0.016, 91° remarks: * orbital elements for (38) Leda : Mean anomaly = 338.40418277 deg Arg. of pericenter = 169.76216566 deg Long. of node = 295.79153848 deg Inclination = 6.97289699 deg Eccentricity = 0.15380509 Semimajor axis = 2.73956137 AU Perihelion dist = 2.31820288 AU Mag: H = 8.36, G = 0.15 Epoch of elements : MJD 55167.86000000 TDT (2009 Dec 02.860) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Dec 2 38 Leda 20h 38.9m UT 11.1 5 15 26.400 30 39 1.75TYC 2390-00492-1 11.9 11.3 116 12.4 1.386 -2.519 -7.61 57.3261 30.651 -132.31 -22.07 20.6476 0.16254 -0.69382 -5.12371 -1.19872 -0.00090 -0.00082 2000 336.69572220091125.00000169.762166295.791538 6.9728970.15380509 2.7395614 2.3182029 8.3 5.00.15 RATE 2.1736150 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.024 91 1.22 0.025 0 54545.5020091202_0492-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 17:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org