Asteroid occultation on July 27

PTS

Hi,
Another event on July 27, see also:

http://occultation.freebbs.hk/thread-5672-1-1.html

Finder charts attached below.


PTS
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IOTA/IOTA-ES occultation update for
          (694) Ekard / TYC 1081-00346-1 event on 2009 Jul 27, 11:43 UT
                          Visible from Taiwan, S China


Summary
-------
On 2009 Jul 27 UT, the 99 km diameter asteroid (694) Ekard will occult a 9.4 mag
star in the constellation Aquila for observers along a path across Taiwan, S
China.

In the case of an occultation, the combined light of the asteroid and the star
will drop by 2.1 mag to 11.3 mag (the magnitude of the asteroid) for at most
17.6 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: 99
    * date and approx. time of event: 2009 Jul 27, 11:24  - 2009 Jul 27, 12:01  UT
    * midpoint of event [JD]: 2455039.98825417
    * magnitude of target star: 9.4
    * magnitude drop [mag]: 2.1
    * estimated maximum duration : 17.6
    * Moon: 36 % sunlit, 111° distance
    * Sun: 148° distance
    * rough path description: Taiwan, S China

Additional comments
-------------------
1.3" double star

The occultation path
--------------------
    * approximate projected width [km]: 99
    * 1 sigma uncertainty interval [path widths]: +/- 0.26
    * 1 sigma uncertainty interval [seconds]: +/- 5.5
    * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .030)
    * 1 sigma uncertainty ellipse (major, minor, PA): ( .053", .027", 73° )
    * approx speed of asteroid's shadow [km/s]: 5.6215
    * website for maps:
          http://www.asteroidoccultation.com