Asteroid occultation on July 28

PTS

Hi,
Another event on July 27-28, see also:

http://occultation.freebbs.hk/thread-5673-1-1.html

and finder charts attached.

PTS
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IOTA/IOTA-ES occultation update for
       (2920) Automedon / TYC 1749-01592-1 event on 2009 Jul 27, 17:08 UT
                       Visible from Japan, China, SE Asia


Summary
-------
On 2009 Jul 27 UT, the 111 km diameter asteroid (2920) Automedon will occult a
12.0 mag star in the constellation Pisces for observers along a path across
Japan, China, SE Asia.

In the case of an occultation, the combined light of the asteroid and the star
will drop by 4.4 mag to 16.4 mag (the magnitude of the asteroid) for at most
10.8 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: 44
    * date and approx. time of event: 2009 Jul 27, 17:04  - 2009 Jul 27, 17:14  UT
    * midpoint of event [JD]: 2455040.21725417
    * magnitude of target star: 12.0
    * magnitude drop [mag]: 4.4
    * estimated maximum duration : 10.8
    * Moon: 38 % sunlit, 168° distance
    * Sun: 94° distance
    * rough path description: Japan, China, SE Asia

The occultation path
--------------------
    * approximate projected width [km]: 139
    * 1 sigma uncertainty interval [path widths]: +/- 1.48
    * 1 sigma uncertainty interval [seconds]: +/- 19.7
    * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .066 +/- .041)
    * 1 sigma uncertainty ellipse (major, minor, PA): ( .066", .041", 89° )
    * approx speed of asteroid's shadow [km/s]: 10.2642
    * website for maps:
          http://www.asteroidoccultation.com

[ 本帖最後由 PTS 於 2009-6-29 21:57 編輯 ]