IOTA/IOTA-ES occultation update for (38) Leda / TYC 2403-01198-1 event on 2009 Oct 05, 06:38 UT Visible from Brazil, Bolivia, Peru Summary ------- On 2009 Oct 05 UT, the 116 km diameter asteroid (38) Leda will occult a 9.9 mag star in the constellation Auriga for observers along a path across Brazil, Bolivia, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 12.7 mag (the magnitude of the asteroid) for at most 12.8 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: 99 * date and approx. time of event: 2009 Oct 05, 06:29 - 2009 Oct 05, 06:41 UT * midpoint of event [JD]: 2455109.77729583 * magnitude of target star: 9.9 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 12.8 * Moon: 99 % sunlit, 59° distance * Sun: 109° distance * rough path description: Brazil, Bolivia, Peru The occultation path -------------------- * approximate projected width [km]: 134 * 1 sigma uncertainty interval [path widths]: +/- 0.26 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .021", 93° ) * approx speed of asteroid's shadow [km/s]: 9.0593 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2403-01198-1 by 38 Leda on 2009 Oct 5 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 -34 42 46 6 29 10 0 52 -50 .. .. .. -33 57 15 .. .. .. -33 33 44 - 94 0 0 -34 3 25 6 29 10 1 51 -51 -34 49 22 -33 17 54 -35 13 27 -32 54 24 - 93 0 0 -33 23 48 6 29 10 2 50 -51 -34 9 44 -32 38 18 -34 33 47 -32 14 48 - 92 0 0 -32 43 55 6 29 11 3 50 -52 -33 29 49 -31 58 27 -33 53 52 -31 34 58 - 91 0 0 -32 3 49 6 29 12 5 49 -52 -32 49 41 -31 18 23 -33 13 43 -30 54 55 - 90 0 0 -31 23 31 6 29 13 6 49 -53 -32 9 20 -30 38 7 -32 33 20 -30 14 41 - 89 0 0 -30 43 2 6 29 15 7 48 -53 -31 28 48 -29 57 42 -31 52 47 -29 34 17 - 88 0 0 -30 2 24 6 29 17 8 48 -53 -30 48 7 -29 17 7 -31 12 3 -28 53 44 - 87 0 0 -29 21 38 6 29 19 9 47 -54 -30 7 17 -28 36 25 -30 31 11 -28 13 4 - 86 0 0 -28 40 47 6 29 22 10 47 -54 -29 26 21 -27 55 38 -29 50 13 -27 32 19 - 85 0 0 -27 59 51 6 29 25 11 46 -54 -28 45 20 -27 14 47 -29 9 9 -26 51 30 - 84 0 0 -27 18 52 6 29 28 12 46 -54 -28 4 15 -26 33 53 -28 28 2 -26 10 39 - 83 0 0 -26 37 52 6 29 32 13 45 -54 -27 23 10 -25 52 58 -27 46 53 -25 29 47 - 82 0 0 -25 56 52 6 29 35 15 45 -55 -26 42 4 -25 12 5 -27 5 44 -24 48 57 - 81 0 0 -25 15 55 6 29 40 16 44 -55 -26 1 0 -24 31 14 -26 24 37 -24 8 9 - 80 0 0 -24 35 1 6 29 44 17 44 -55 -25 20 0 -23 50 27 -25 43 33 -23 27 25 - 79 0 0 -23 54 13 6 29 49 18 43 -55 -24 39 4 -23 9 46 -25 2 33 -22 46 48 - 78 0 0 -23 13 32 6 29 54 19 43 -55 -23 58 16 -22 29 12 -24 21 41 -22 6 18 - 77 0 0 -22 33 0 6 30 0 20 42 -54 -23 17 36 -21 48 48 -23 40 56 -21 25 58 - 76 0 0 -21 52 38 6 30 6 21 42 -54 -22 37 6 -21 8 34 -23 0 22 -20 45 48 - 75 0 0 -21 12 28 6 30 12 22 41 -54 -21 56 47 -20 28 33 -22 19 59 -20 5 51 - 74 0 0 -20 32 32 6 30 18 24 41 -54 -21 16 42 -19 48 45 -21 39 50 -19 26 8 - 73 0 0 -19 52 52 6 30 25 25 40 -53 -20 36 52 -19 9 13 -20 59 55 -18 46 40 - 72 0 0 -19 13 27 6 30 32 26 40 -53 -19 57 19 -18 29 58 -20 20 17 -18 7 30 - 71 0 0 -18 34 22 6 30 39 27 39 -53 -19 18 4 -17 51 2 -19 40 56 -17 28 38 - 70 0 0 -17 55 35 6 30 47 28 39 -52 -18 39 8 -17 12 25 -19 1 55 -16 50 6 - 69 0 0 -17 17 11 6 30 55 29 38 -52 -18 0 33 -16 34 10 -18 23 15 -16 11 56 - 68 0 0 -16 39 8 6 31 3 30 38 -51 -17 22 21 -15 56 17 -17 44 58 -15 34 8 - 67 0 0 -16 1 30 6 31 12 31 37 -51 -16 44 32 -15 18 49 -17 7 4 -14 56 45 - 66 0 0 -15 24 17 6 31 21 32 37 -50 -16 7 9 -14 41 46 -16 29 35 -14 19 47 - 65 0 0 -14 47 30 6 31 30 34 36 -50 -15 30 12 -14 5 10 -15 52 32 -13 43 16 - 64 0 0 -14 11 12 6 31 39 35 36 -49 -14 53 43 -13 29 1 -15 15 57 -13 7 13 - 63 0 0 -13 35 22 6 31 49 36 35 -48 -14 17 42 -12 53 22 -14 39 51 -12 31 39 - 62 0 0 -13 0 2 6 31 58 37 35 -48 -13 42 12 -12 18 13 -14 4 15 -11 56 35 - 61 0 0 -12 25 14 6 32 8 38 34 -47 -13 7 13 -11 43 35 -13 29 11 -11 22 3 - 60 0 0 -11 50 57 6 32 19 39 33 -46 -12 32 46 -11 9 29 -12 54 38 -10 48 2 - 59 0 0 -11 17 14 6 32 29 40 33 -45 -11 58 52 -10 35 56 -12 20 38 -10 14 35 - 58 0 0 -10 44 5 6 32 40 41 32 -44 -11 25 32 -10 2 58 -11 47 13 - 9 41 42 - 57 0 0 -10 11 31 6 32 51 42 31 -44 -10 52 47 - 9 30 34 -11 14 22 - 9 9 23 - 56 0 0 - 9 39 33 6 33 2 43 30 -43 -10 20 38 - 8 58 46 -10 42 8 - 8 37 41 - 55 0 0 - 9 8 11 6 33 13 44 30 -42 - 9 49 6 - 8 27 35 -10 10 30 - 8 6 35 - 54 0 0 - 8 37 27 6 33 25 45 29 -41 - 9 18 11 - 7 57 1 - 9 39 30 - 7 36 6 - 53 0 0 - 8 7 20 6 33 36 46 28 -40 - 8 47 54 - 7 27 4 - 9 9 7 - 7 6 15 - 52 0 0 - 7 37 53 6 33 48 47 27 -39 - 8 18 16 - 6 57 47 - 8 39 24 - 6 37 2 - 51 0 0 - 7 9 4 6 34 0 48 26 -38 - 7 49 17 - 6 29 8 - 8 10 20 - 6 8 29 - 50 0 0 - 6 40 55 6 34 12 48 25 -37 - 7 20 59 - 6 1 9 - 7 41 55 - 5 40 35 - 49 0 0 - 6 13 27 6 34 24 49 24 -36 - 6 53 20 - 5 33 50 - 7 14 12 - 5 13 21 - 48 0 0 - 5 46 39 6 34 36 50 23 -36 - 6 26 22 - 5 7 12 - 6 47 9 - 4 46 48 - 47 0 0 - 5 20 32 6 34 49 51 22 -35 - 6 0 6 - 4 41 15 - 6 20 48 - 4 20 55 - 46 0 0 - 4 55 7 6 35 1 52 21 -34 - 5 34 32 - 4 15 59 - 5 55 8 - 3 55 44 - 45 0 0 - 4 30 24 6 35 14 52 20 -33 - 5 9 39 - 3 51 25 - 5 30 11 - 3 31 15 - 44 0 0 - 4 6 23 6 35 27 53 19 -32 - 4 45 29 - 3 27 33 - 5 5 56 - 3 7 27 - 43 0 0 - 3 43 4 6 35 40 54 18 -31 - 4 22 2 - 3 4 23 - 4 42 24 - 2 44 22 - 42 0 0 - 3 20 28 6 35 52 55 16 -30 - 3 59 17 - 2 41 55 - 4 19 35 - 2 21 59 - 41 0 0 - 2 58 36 6 36 5 55 15 -29 - 3 37 16 - 2 20 11 - 3 57 29 - 2 0 18 - 40 0 0 - 2 37 26 6 36 18 56 13 -28 - 3 15 58 - 1 59 9 - 3 36 7 - 1 39 21 - 39 0 0 - 2 17 0 6 36 31 56 12 -27 - 2 55 24 - 1 38 51 - 3 15 28 - 1 19 7 - 38 0 0 - 1 57 17 6 36 44 57 10 -26 - 2 35 33 - 1 19 16 - 2 55 34 - 0 59 35 - 37 0 0 - 1 38 18 6 36 58 57 9 -25 - 2 16 27 - 1 0 24 - 2 36 23 - 0 40 47 - 36 0 0 - 1 20 2 6 37 11 58 7 -24 - 1 58 4 - 0 42 15 - 2 17 57 - 0 22 42 - 35 0 0 - 1 2 30 6 37 24 58 6 -23 - 1 40 25 - 0 24 51 - 2 0 14 - 0 5 21 - 34 0 0 - 0 45 43 6 37 37 59 4 -22 - 1 23 31 - 0 8 10 - 1 43 16 0 11 16 - 33 0 0 - 0 29 39 6 37 50 59 2 -21 - 1 7 21 0 7 48 - 1 27 3 0 27 11 - 32 0 0 - 0 14 19 6 38 3 59 1 -20 - 0 51 54 0 23 2 - 1 11 33 0 42 21 - 31 0 0 0 0 17 6 38 17 59 359 -18 - 0 37 13 0 37 32 - 0 56 48 0 56 48 - 30 0 0 0 14 9 6 38 30 60 357 -17 - 0 23 15 0 51 18 - 0 42 48 1 10 32 - 29 0 0 0 27 16 6 38 43 60 355 -16 - 0 10 2 1 4 20 - 0 29 32 1 23 31 - 28 0 0 0 39 40 6 38 56 60 353 -15 0 2 27 1 16 39 - 0 17 0 1 35 47 - 27 0 0 0 51 20 6 39 9 60 351 -14 0 14 11 1 28 14 - 0 5 13 1 47 20 - 26 0 0 1 2 15 6 39 23 60 350 -13 0 25 12 1 39 5 0 5 50 1 58 9 - 25 0 0 1 12 27 6 39 36 60 348 -12 0 35 28 1 49 13 0 16 8 2 8 14 - 24 0 0 1 21 55 6 39 49 60 346 -11 0 44 59 1 58 37 0 25 42 2 17 36 - 23 0 0 1 30 39 6 40 2 60 344 -10 0 53 47 2 7 17 0 34 31 2 26 15 - 22 0 0 1 38 39 6 40 15 59 342 -9 1 1 51 2 15 14 0 42 37 2 34 10 - 21 0 0 1 45 55 6 40 28 59 341 -8 1 9 10 2 22 27 0 49 58 2 41 21 - 20 0 0 1 52 28 6 40 41 59 339 -7 1 15 45 2 28 57 0 56 34 2 47 49 - 19 0 0 1 58 16 6 40 54 59 337 -6 1 21 37 2 34 43 1 2 27 2 53 34 - 18 0 0 2 3 22 6 41 6 58 336 -5 1 26 44 2 39 46 1 7 36 2 58 36 - 17 0 0 2 7 43 6 41 19 58 334 -4 1 31 7 2 44 5 1 12 0 3 2 55 - 16 0 0 2 11 21 6 41 32 58 333 -3 1 34 47 2 47 41 1 15 40 3 6 30 - 15 0 0 2 14 15 6 41 44 57 331 -2 1 37 42 2 50 34 1 18 37 3 9 22 - 14 0 0 2 16 26 6 41 57 57 330 -1 1 39 54 2 52 44 1 20 49 3 11 31 Uncertainty in time = +/- 5 secs [Prediction of 2008 Apr 28.0] Data for the target star ------------------------ * name: TYC 2403-01198-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 26 55.1801 DE: +30 37 18.882 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .018 ) * V mag [mag]: 9.9 * B mag [mag]: 10.3 * Apparent position with proper motion RA(deg): 81.8935874319 DE(deg): 30.6305956808 * Equation of equinoxes (radians) : 0.000063615909381 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (38) Leda approx. diameter [km]: 116 approx. diameter ["]: .084 distance from Earth [AU]: 1.89900 * 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): 0.025, 0.012, 94° remarks: * orbital elements for (38) Leda : Mean anomaly = 325.66679181 deg Arg. of pericenter = 169.76373609 deg Long. of node = 295.79126432 deg Inclination = 6.97292827 deg Eccentricity = 0.15376560 Semimajor axis = 2.73944669 AU Perihelion dist = 2.31821404 AU Mag: H = 8.36, G = 0.15 Epoch of elements : MJD 55109.27700000 TDT (2009 Oct 05.277) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 5 38 Leda 6h 39.3m UT 9.9 5 26 55.180 30 37 18.88TYC 2403-01198-1 10.3 12.7 116 12.8 1.899 1.799 4.62 -32.1746 30.620 77.29 -4.81 6.6551 0.09904 -0.49231 5.01515 0.99716 -0.00524 -0.00054 2000 323.6502032009 926.00000169.763736295.791264 6.9729280.15376560 2.7394467 2.3182140 8.3 5.00.15 RATE 2.1737510 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.021 93 1.26 0.022 0 54584.5020091005_1198-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 28, 03:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org