IOTA/IOTA-ES occultation update for (2559) Svoboda / TYC 1770-01424-1 event on 2009 Oct 08, 16:21 UT Visible from Summary ------- On 2009 Oct 08 UT, the 26 km diameter asteroid (2559) Svoboda will occult a 10.5 mag star in the constellation Aries for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 16.0 mag (the magnitude of the asteroid) for at most 3.3 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: 19 * date and approx. time of event: 2009 Oct 08, 16:11 - 2009 Oct 08, 16:32 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 3.3 * Moon: 79 % sunlit, 27° distance * Sun: 151° distance * rough path description: Additional comments ------------------- 17.5" double The occultation path -------------------- * approximate projected width [km]: 35 * 1 sigma uncertainty interval [path widths]: +/- 3.58 * 1 sigma uncertainty interval [seconds]: +/- 12.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .098 +/- .076) * 1 sigma uncertainty ellipse (major, minor, PA): ( .102", .070", 66° ) * approx speed of asteroid's shadow [km/s]: 7.8116 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1770-01424-1 by 2559 Svoboda on 2009 Oct 8 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 56 0 0 -26 53 42 16 32 4 0 62 -29 -26 42 45 -27 4 42 .. .. .. .. .. .. 57 0 0 -26 25 8 16 32 4 1 61 -30 -26 14 14 -26 36 4 .. .. .. -27 55 29 58 0 0 -25 57 4 16 32 4 2 61 -31 -25 46 13 -26 7 57 .. .. .. -27 26 57 59 0 0 -25 29 29 16 32 3 3 60 -32 -25 18 41 -25 40 19 .. .. .. -26 58 57 60 0 0 -25 2 25 16 32 1 4 60 -33 -24 51 41 -25 13 12 .. .. .. -26 31 27 61 0 0 -24 35 53 16 32 0 5 60 -34 -24 25 11 -24 46 37 .. .. .. -26 4 28 62 0 0 -24 9 52 16 31 58 6 59 -35 -23 59 13 -24 20 33 .. .. .. -25 38 2 63 0 0 -23 44 23 16 31 56 7 59 -36 -23 33 47 -23 55 1 -22 18 50 -25 12 8 64 0 0 -23 19 26 16 31 53 8 58 -37 -23 8 53 -23 30 1 -21 54 16 -24 46 47 65 0 0 -22 55 3 16 31 50 9 58 -38 -22 44 32 -23 5 35 -21 30 15 -24 22 0 66 0 0 -22 31 12 16 31 47 10 58 -39 -22 20 45 -22 41 41 -21 6 46 -23 57 46 67 0 0 -22 7 55 16 31 44 11 57 -40 -21 57 30 -22 18 21 -20 43 50 -23 34 5 68 0 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Uncertainty in time = +/- 15 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 1770-01424-1 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 30 16.4793 DE: +24 52 52.567 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .021 ) * V mag [mag]: 10.5 * B mag [mag]: 12.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2559) Svoboda approx. diameter [km]: 26 approx. diameter ["]: .023 distance from Earth [AU]: 1.54100 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 607 number of rejected observations: 12 time covered by the observations: 1930 Dec 13 - 2007 Sep 01 1 sigma uncertainty ellipse (major, minor, PA): 0.101, 0.067, 65° remarks: * orbital elements for (2559) Svoboda : Mean anomaly = 325.85597394 deg Arg. of pericenter = 87.92824565 deg Long. of node = 350.28833914 deg Inclination = 8.88758195 deg Eccentricity = 0.15208905 Semimajor axis = 2.78770715 AU Perihelion dist = 2.36372742 AU Mag: H = 12.23, G = 0.15 Epoch of elements : MJD 55112.68200000 TDT (2009 Oct 08.682) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 8 2559 Svoboda 16h 22.0m UT 10.5 2 30 16.479 24 52 52.57TYC 1770-01424-1 12.1 16.0 26 3.3 1.541 -1.808 5.35 134.6405 24.879 -68.63 -6.11 16.3663 -0.14218 -0.65494 -4.30800 0.93866 -0.00224 -0.00163 2000 325.288048200910 6.00000 87.928246350.288339 8.8875820.15208905 2.7877072 2.363727412.4 5.00.15 RATE 2.1175480 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.102 0.070 66 4.58 0.083 0 54581.5020091008_1424-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 08:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org