IOTA/IOTA-ES occultation update for (156) Xanthippe / TYC 5171-00031-1 event on 2009 Aug 08, 16:03 UT Visible from Summary ------- On 2009 Aug 08 UT, the 121 km diameter asteroid (156) Xanthippe will occult a 11.3 mag star in the constellation Aquila for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 12.3 mag (the magnitude of the asteroid) for at most 11.5 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 Aug 08, 15:53 - 2009 Aug 08, 16:12 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 11.5 * Moon: 93 % sunlit, 39° distance * Sun: 163° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 130 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .025", 78° ) * approx speed of asteroid's shadow [km/s]: 10.4773 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5171-00031-1 by 156 Xanthippe on 2009 Aug 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 16 0 0 -36 50 40 16 12 44 2 93 0 -36 15 28 -37 26 0 -35 58 37 -37 43 1 17 0 0 -36 54 5 16 12 43 3 93 -1 -36 18 53 -37 29 24 -36 2 3 -37 46 25 18 0 0 -36 57 15 16 12 43 4 92 -2 -36 22 4 -37 32 34 -36 5 14 -37 49 34 19 0 0 -37 0 10 16 12 42 5 92 -2 -36 25 0 -37 35 29 -36 8 10 -37 52 29 20 0 0 -37 2 52 16 12 41 5 91 -3 -36 27 42 -37 38 10 -36 10 52 -37 55 10 21 0 0 -37 5 18 16 12 40 6 90 -4 -36 30 9 -37 40 36 -36 13 19 -37 57 36 22 0 0 -37 7 31 16 12 39 7 90 -5 -36 32 22 -37 42 48 -36 15 32 -37 59 48 23 0 0 -37 9 29 16 12 38 8 89 -5 -36 34 20 -37 44 46 -36 17 31 -38 1 45 24 0 0 -37 11 12 16 12 37 9 89 -6 -36 36 4 -37 46 29 -36 19 15 -38 3 28 25 0 0 -37 12 42 16 12 35 9 88 -7 -36 37 33 -37 47 58 -36 20 44 -38 4 57 26 0 0 -37 13 56 16 12 34 10 87 -8 -36 38 48 -37 49 13 -36 21 59 -38 6 12 27 0 0 -37 14 57 16 12 32 11 87 -9 -36 39 49 -37 50 14 -36 23 0 -38 7 13 28 0 0 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5 44 - 5 38 10 - 7 22 47 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 5171-00031-1 * constellation : Aquila * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 26 20.7798 DE: -04 00 09.413 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 11.3 * B mag [mag]: 11.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (156) Xanthippe approx. diameter [km]: 121 approx. diameter ["]: .103 distance from Earth [AU]: 1.62300 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 911 number of rejected observations: 152 time covered by the observations: 1901 Sep 19 - 2008 Feb 14 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.015, 72° remarks: * orbital elements for (156) Xanthippe : Mean anomaly = 65.74338003 deg Arg. of pericenter = 338.18050897 deg Long. of node = 242.14463457 deg Inclination = 9.74393629 deg Eccentricity = 0.22244269 Semimajor axis = 2.73404225 AU Perihelion dist = 2.12587453 AU Mag: H = 8.58, G = 0.15 Epoch of elements : MJD 55051.66900000 TDT (2009 Aug 08.669) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 8 156 Xanthippe 16h 3.3m UT 11.3 20 26 20.780- 4 0 9.41TYC 5171-00031-1 11.9 12.3 121 11.5 1.623 -2.067 -8.33 108.4628 -4.001 -59.42 15.97 16.0551 0.09524 -0.35395 -5.71066 -1.53625 0.00108 -0.00116 2000 65.3795052009 8 7.00000338.180509242.144635 9.7439360.22244269 2.7340423 2.1258745 8.6 5.00.15 RATE 2.1801990 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.025 78 1.24 0.025 0 54545.5020090808_0031-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 11:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org