IOTA/IOTA-ES occultation update for (747) Winchester / UCAC2 23750990 event on 2009 Sep 05, 11:09 UT Visible from Summary ------- On 2009 Sep 05 UT, the 172 km diameter asteroid (747) Winchester will occult a 11.8 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.1 mag to 12.4 mag (the magnitude of the asteroid) for at most 25.0 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: 98 * date and approx. time of event: 2009 Sep 05, 10:54 - 2009 Sep 05, 11:23 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 1.1 * estimated maximum duration [s]: 25.0 * Moon: 99 % sunlit, 62° distance * Sun: 128° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 176 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 6.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .044 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .026", 91° ) * approx speed of asteroid's shadow [km/s]: 6.8775 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 23750990 by 747 Winchester on 2009 Sep 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 ' " Longitude Longitude Longitude Longitude -152 12 55 49 0 0 10 54 29 1 237 -34 -154 21 2 ... .. .. -155 49 35 ... .. .. -154 26 15 48 0 0 10 54 30 2 235 -35 -156 25 58 -152 20 56 -157 49 10 -150 46 38 Latitude Latitude Latitude Latitude -156 0 0 47 14 18 10 54 31 4 234 -36 48 12 54 46 15 28 48 54 58 45 32 57 -157 0 0 46 43 27 10 54 32 4 234 -36 47 42 44 45 43 55 48 25 16 45 0 55 -158 0 0 46 11 16 10 54 33 5 233 -37 47 11 15 45 11 2 47 54 19 44 27 31 -159 0 0 45 37 44 10 54 34 6 232 -38 46 38 27 44 36 46 47 22 2 43 52 42 -160 0 0 45 2 47 10 54 36 7 231 -38 46 4 16 44 1 3 46 48 23 43 16 26 -161 0 0 44 26 23 10 54 38 8 231 -39 45 28 39 43 23 51 46 13 19 42 38 39 -162 0 0 43 48 27 10 54 40 9 230 -40 44 51 31 42 45 5 45 36 47 41 59 18 -163 0 0 43 8 56 10 54 43 10 229 -40 44 12 51 42 4 43 44 58 44 41 18 18 -164 0 0 42 27 47 10 54 46 11 229 -41 43 32 35 41 22 41 44 19 5 40 35 37 -165 0 0 41 44 55 10 54 49 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-79 14 53 -80 49 38 -78 40 54 -81 23 53 58 0 0 -80 2 39 11 23 26 22 83 0 -79 15 23 -80 50 4 -78 41 26 -81 24 17 Uncertainty in time = +/- 10 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 23750990 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 29 19.4300 DE: -20 37 30.206 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .041, .024 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (747) Winchester approx. diameter [km]: 172 approx. diameter ["]: .116 distance from Earth [AU]: 2.04800 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 863 number of rejected observations: 132 time covered by the observations: 1913 Mar 09 - 2008 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.010, 104° remarks: * orbital elements for (747) Winchester : Mean anomaly = 301.32288976 deg Arg. of pericenter = 275.25181342 deg Long. of node = 130.15153260 deg Inclination = 18.17697940 deg Eccentricity = 0.34186098 Semimajor axis = 3.00022468 AU Perihelion dist = 1.97456493 AU Mag: H = 7.72, G = 0.15 Epoch of elements : MJD 55079.46500000 TDT (2009 Sep 05.465) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 5 747 Winchester 11h 9.6m UT 11.8 19 29 19.430-20 37 30.21UCAC2 23750990 0.0 12.4 172 25.0 2.048 -0.480 -15.23 140.2482 -20.621 12.28 6.67 11.1593 0.19339 -0.08591 -1.57256 -3.54905 0.00439 0.00059 2000 299.5277682009 827.00000275.251813130.151533 18.1769790.34186098 3.0002247 1.9745649 7.7 5.00.15 RATE 1.8965900 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.044 0.026 91 1.36 0.041 0 54545.5020090905_750990 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 12:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org