IOTA/IOTA-ES occultation update for (247) Eukrate / UCAC2 10038190 event on 2009 Sep 02, 00:52 UT Visible from Summary ------- On 2009 Sep 02 UT, the 134 km diameter asteroid (247) Eukrate will occult a 11.2 mag star in the constellation Ara for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.6 mag to 13.7 mag (the magnitude of the asteroid) for at most 9.2 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: 83 * date and approx. time of event: 2009 Sep 02, 00:47 - 2009 Sep 02, 00:59 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 2.6 * estimated maximum duration [s]: 9.2 * Moon: 94 % sunlit, 55° distance * Sun: 100° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 143 * 1 sigma uncertainty interval [path widths]: +/- 0.62 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .038", 3° ) * approx speed of asteroid's shadow [km/s]: 14.5932 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 10038190 by 247 Eukrate on 2009 Sep 2 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. 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19 132 0 0 -81 27 4 0 48 8 45 139 -1 -83 29 19 -79 29 11 -86 7 57 -77 8 15 131 0 0 -80 59 24 0 48 5 44 140 -1 -83 7 20 -78 56 27 -85 54 6 -76 29 56 130 0 0 -80 28 46 0 48 2 44 141 0 -82 42 49 -78 20 25 -85 38 30 -75 47 58 129 0 0 -79 54 43 0 47 59 43 143 0 -82 15 23 -77 40 36 -85 20 51 -75 1 56 Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 10038190 * constellation : Ara * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 10 19.0259 DE: -50 54 04.248 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .039 ) * V mag [mag]: 11.2 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (247) Eukrate approx. diameter [km]: 134 approx. diameter ["]: .067 distance from Earth [AU]: 2.76600 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 444 number of rejected observations: 102 time covered by the observations: 1901 Oct 12 - 2008 Feb 09 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.021, 104° remarks: * orbital elements for (247) Eukrate : Mean anomaly = 248.26219891 deg Arg. of pericenter = 54.85098224 deg Long. of node = 0.21730752 deg Inclination = 24.99379459 deg Eccentricity = 0.24410769 Semimajor axis = 2.74027796 AU Perihelion dist = 2.07135505 AU Mag: H = 7.92, G = 0.15 Epoch of elements : MJD 55076.03600000 TDT (2009 Sep 02.036) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 2 247 Eukrate 0h 52.6m UT 11.2 17 10 19.026-50 54 4.25UCAC2 10038190 0.0 13.7 134 9.2 2.766 1.735 20.41 -96.8867 -50.907 166.80 7.93 0.8768 0.27446 -0.22073 5.15880 6.42123 0.00560 -0.00001 2000 246.9507202009 827.00000 54.850982 0.217308 24.9937950.24410769 2.7402780 2.0713550 8.0 5.00.15 RATE 2.1727620 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.044 0.038 3 1.62 0.042 0 54545.5020090902_038190 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 12:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org