IOTA/IOTA-ES occultation update for (319) Leona / TYC 5649-00397-1 event on 2008 May 03, 21:34 UT Visible from Arabia, Africa Summary ------- On 2008 May 03 UT, the 81 km diameter asteroid (319) Leona will occult a 11.2 mag star in the constellation Ophiuchus for observers along a path across Arabia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.8 mag to 16.0 mag (the magnitude of the asteroid) for at most 6.9 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 64 * date and approx. time of event: 2008 May 03, 21:26 - 2008 May 03, 21:42 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 4.8 * estimated maximum duration [s]: 6.9 * Moon: 4 % sunlit, 120° distance * Sun: 143° distance * rough path description: Arabia, Africa The occultation path -------------------- * approximate projected width [km]: 83 * 1 sigma uncertainty interval [path widths]: +/- 0.95 * 1 sigma uncertainty interval [seconds]: +/- 6.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .032", 91° ) * approx speed of asteroid's shadow [km/s]: 11.7520 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5649-00397-1 by 319 Leona on 2008 May 3 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 - 10 0 0 39 7 3 21 42 23 0 104 -22 .. .. .. 38 43 46 .. .. .. 37 59 39 - 9 0 0 38 55 8 21 42 23 1 105 -22 39 18 30 38 31 49 40 3 1 37 47 36 - 8 0 0 38 42 50 21 42 23 2 105 -23 39 6 14 38 19 27 39 50 50 37 35 9 - 7 0 0 38 30 7 21 42 23 2 106 -24 38 53 34 38 6 41 39 38 16 37 22 18 - 6 0 0 38 16 59 21 42 22 3 107 -24 38 40 30 37 53 31 39 25 17 37 9 2 - 5 0 0 38 3 28 21 42 22 4 107 -25 38 27 2 37 39 57 39 11 54 36 55 22 - 4 0 0 37 49 32 21 42 21 5 108 -26 38 13 9 37 25 58 38 58 7 36 41 18 - 3 0 0 37 35 12 21 42 20 6 108 -26 37 58 52 37 11 35 38 43 56 36 26 49 - 2 0 0 37 20 28 21 42 19 7 109 -27 37 44 11 36 56 48 38 29 21 36 11 56 - 1 0 0 37 5 19 21 42 18 7 110 -28 37 29 5 36 41 36 38 14 22 35 56 38 0 0 0 36 49 46 21 42 17 8 110 -29 37 13 35 36 26 0 37 58 58 35 40 56 1 0 0 36 33 49 21 42 16 9 111 -29 36 57 41 36 9 59 37 43 10 35 24 49 2 0 0 36 17 27 21 42 15 10 111 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-10 36 1 -11 22 22 - 9 51 50 -12 6 15 116 0 0 -11 12 34 21 28 8 49 266 -14 -10 49 25 -11 35 41 -10 5 18 -12 19 30 117 0 0 -11 25 28 21 28 1 48 266 -13 -11 2 21 -11 48 33 -10 18 19 -12 32 18 118 0 0 -11 37 55 21 27 54 48 266 -12 -11 14 50 -12 0 57 -10 30 52 -12 44 38 119 0 0 -11 49 54 21 27 47 47 267 -11 -11 26 51 -12 12 55 -10 42 57 -12 56 32 120 0 0 -12 1 26 21 27 40 46 267 -10 -11 38 25 -12 24 25 -10 54 35 -13 7 58 121 0 0 -12 12 31 21 27 34 45 267 -9 -11 49 32 -12 35 27 -11 5 45 -13 18 57 122 0 0 -12 23 7 21 27 27 44 267 -8 -12 0 10 -12 46 2 -11 16 27 -13 29 29 123 0 0 -12 33 17 21 27 21 43 267 -8 -12 10 21 -12 56 10 -11 26 41 -13 39 33 124 0 0 -12 42 58 21 27 14 42 267 -7 -12 20 4 -13 5 49 -11 36 28 -13 49 9 125 0 0 -12 52 12 21 27 8 41 267 -6 -12 29 20 -13 15 2 -11 45 46 -13 58 18 126 0 0 -13 0 57 21 27 2 40 267 -5 -12 38 7 -13 23 46 -11 54 36 -14 7 0 127 0 0 -13 9 15 21 26 56 39 266 -4 -12 46 26 -13 32 2 -12 2 58 -14 15 14 128 0 0 -13 17 5 21 26 50 38 266 -3 -12 54 18 -13 39 51 -12 10 52 -14 23 0 129 0 0 -13 24 27 21 26 44 37 266 -2 -13 1 41 -13 47 12 -12 18 18 -14 30 18 130 0 0 -13 31 21 21 26 39 36 266 -1 -13 8 36 -13 54 4 -12 25 16 -14 37 8 131 0 0 -13 37 47 21 26 33 35 266 0 -13 15 3 -14 0 29 -12 31 45 -14 43 31 Uncertainty in time = +/- 7 secs [Prediction of 2008 Apr 23.0] Data for the target star ------------------------ * name: TYC 5649-00397-1 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 14 45.7780 DE: -10 52 31.104 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .027 ) * V mag [mag]: 11.2 * B mag [mag]: 12.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (319) Leona approx. diameter [km]: 81 approx. diameter ["]: .034 distance from Earth [AU]: 3.25400 * orbital information: orbit source: Preston date of fit: 2008 Apr 22 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 866 number of rejected observations: 49 time covered by the observations: 1916 Sep 22 - 2008 Apr 19 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.016, 92° remarks: * orbital elements for (319) Leona : Mean anomaly = 205.75235606 deg Arg. of pericenter = 228.57228759 deg Long. of node = 185.36177165 deg Inclination = 10.53819455 deg Eccentricity = 0.22444743 Semimajor axis = 3.39539810 AU Perihelion dist = 2.63330970 AU Mag: H = 10.12, G = 0.15 Epoch of elements : MJD 54589.89900000 TDT (2008 May 03.899) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 3 319 Leona 21h 33.6m UT 11.2 17 14 45.778-10 52 31.10TYC 5649-00397-1 12.0 16.0 81 6.9 3.254 -1.095 7.85 73.1370 -10.877 -144.20 15.99 21.5601 0.10505 0.21410 -5.96332 2.90469 -0.00345 -0.00074 2000 204.1929492008 424.00000228.572288185.361772 10.5381950.22444743 3.3953981 2.6333097 9.8 5.00.15 RATE 1.5753180 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.032 91 1.95 0.033 0 54579.5020080503_0397-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 23, 03:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org