IOTA/IOTA-ES occultation update for (73480) 2002 PN34 / TYC 1164-01688-1 event on 2008 Jul 11, 09:05 UT Visible from possible N or S America Summary ------- On 2008 Jul 11 UT, the 101 km diameter asteroid (73480) 2002 PN34 will occult a 11.5 mag star in the constellation Pegasus for observers along a path across possible N or S America. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.9 mag to 20.4 mag (the magnitude of the asteroid) for at most 11.7 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: 1 * date and approx. time of event: 2008 Jul 11, 09:05 - 2008 Jul 11, 09:05 UT * midpoint of event [JD]: 2454658.89040833 * magnitude of target star: 11.5 * magnitude drop [mag]: 8.9 * estimated maximum duration [s]: 11.7 * Moon: 62 % sunlit, 141° distance * Sun: 114° distance * rough path description: possible N or S America The occultation path -------------------- * approximate projected width [km]: 101 * 1 sigma uncertainty interval [path widths]: +/- 69.51 * 1 sigma uncertainty interval [seconds]: +/- 401.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .604 +/- .354) * 1 sigma uncertainty ellipse (major, minor, PA): ( .678", .177", 62° ) * approx speed of asteroid's shadow [km/s]: 8.6034 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Path does not land on Earth. Data for the target star ------------------------ * name: TYC 1164-01688-1 * constellation : Pegasus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 18 39.2912 DE: +10 24 08.260 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .033, .028 ) * V mag [mag]: 11.5 * B mag [mag]: 12.2 * Apparent position with proper motion RA(deg): 349.7766003067 DE(deg): 10.4497604749 * Equation of equinoxes (radians) : 0.000050895625671 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (73480) 2002 PN34 approx. diameter [km]: 101 approx. diameter ["]: .009 distance from Earth [AU]: 15.32200 * orbital information: orbit source: Preston date of fit: 2008 Jun 04 source of used astrometry: MPC (via Astdys) number of used observations: 119 number of rejected observations: 3 time covered by the observations: 2001 Jun 12 - 2007 Oct 20 1 sigma uncertainty ellipse (major, minor, PA): 0.677, 0.175, 62° remarks: * orbital elements for (73480) 2002 PN34 : Mean anomaly = 13.70848450 deg Arg. of pericenter = 358.55719380 deg Long. of node = 299.14435452 deg Inclination = 16.62512638 deg Eccentricity = 0.57224026 Semimajor axis = 31.18237662 AU Perihelion dist = 13.33856526 AU Mag: H = 8.18, G = 0.15 Epoch of elements : MJD 54658.37900000 TDT (2008 Jul 11.379) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 11 73480 2002 PN34 9h 22.2m UT 11.5 23 18 39.291 10 24 8.26TYC 1164-01688-1 12.2 20.4 101 11.7 15.322 -0.147 1.76 -80.5446 10.402 40.85 22.03 9.3698 1.39727 1.72061 -3.76950 3.06130 -0.00460 -0.00265 2000 13.6610572008 7 3.00000358.557194299.144355 16.6251260.5722402631.182376613.3385653 8.2 5.00.15 RATE 0.0566030 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.678 0.177 62 70.51 0.632 0 54621.5020080711_1688-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 06, 22:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org