IOTA/IOTA-ES occultation update for (0) 2000 WM183 / UCAC2 39440237 event on 2012 Nov 17, 23:22 UT Visible from possibly Earth Summary ------- On 2012 Nov 17 UT, the 123 km diameter asteroid (0) 2000 WM183 will occult a 13.6 mag star in the constellation Taurus for observers along a path across possibly Earth. In the case of an occultation, the combined light of the asteroid and the star will drop by 10.5 mag to 24.1 mag (the magnitude of the asteroid) for at most 5.1 seconds. This update is based on historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 0 * date and approx. time of event: 2012 Nov 17, 23:22 - 2012 Nov 17, 23:22 UT * geocentric midpoint of event [JD]: 2456248.18870417 * magnitude of target star: 13.6 * magnitude drop [mag]: 10.5 * estimated maximum duration [s]: 5.1 * Moon: 11 % sunlit, 163° distance * Sun: 159° distance * rough path description: possibly Earth The occultation path -------------------- * approximate projected width [km]: 123 * 1 sigma uncertainty interval [path widths]: +/- 326.59 * 1 sigma uncertainty interval [seconds]: +/- 9420.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 7.052 +/- 1.628) * 1 sigma uncertainty ellipse (major, minor, PA): ( 7.237", .139", 77° ) * approx speed of asteroid's shadow [km/s]: 24.1961 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Path does not land on Earth. Data for the target star ------------------------ * name: UCAC2 39440237 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 59 24.7960 DE: +21 57 09.235 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .078, .078 ) * V mag [mag]: 13.6 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 75.0562220300 DE(deg): 21.9706982873 * Equation of equinoxes (radians) : 0.000059265481775 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (0) 2000 WM183 approx. diameter [km]: 123 approx. diameter ["]: .003 distance from Earth [AU]: 48.49500 * orbital information: orbit source: Preston date of fit: 2011 May 06 source of used astrometry: MPC (via Astdys) number of used observations: 16 number of rejected observations: 0 time covered by the observations: 2000 Nov 26 - 2001 Dec 13 1 sigma uncertainty ellipse (major, minor, PA): 7.237, 0.115, 77° remarks: * orbital elements for (0) 2000 WM183 : Mean anomaly = 215.57509532 deg Arg. of pericenter = 145.30721036 deg Long. of node = 81.25100701 deg Inclination = 7.42480315 deg Eccentricity = 0.11080620 Semimajor axis = 45.17993865 AU Perihelion dist = 40.17372132 AU Mag: H = 7.15, G = 0.15 Epoch of elements : MJD 56248.97400000 TDT (2012 Nov 17.974) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 16 0 2000 WM183 16h 31.7m UT 13.6 4 59 24.796 21 57 9.23UCAC2 39440237 0.0 24.1 123 5.1 48.495 -0.177 -0.22 130.7707 21.950 -71.70 -18.95 16.5289 5.00714-56.45060-13.60358 -1.20622 -0.00223 -0.00016 2000 215.545970201211 9.00000145.307210 81.251007 7.4248030.1108062045.179938740.1737213 7.2 5.00.15 RATE 0.0324550 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 7.237 0.139 77327.59 1.142 0 0 0 5 055687.0020121116_440237 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 25, 20:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org