Asteroid occultation on July 25

PTS

Hi,
Another asteroid occultationon July 25.  Please see:

http://occultation.freebbs.hk/thread-5671-1-1.html

Finder charts attached below.

PTS


------------------------------------------
IOTA/IOTA-ES occultation update for
          (554) Peraga / 2UCAC 23012220 event on 2009 Jul 25, 11:19 UT
                              Visible from Hawaii


Summary
-------
On 2009 Jul 25 UT, the 96 km diameter asteroid (554) Peraga will occult a 12.0
mag star in the constellation Sagittarius for observers along a path across
Hawaii.

In the case of an occultation, the combined light of the asteroid and the star
will drop by 1.0 mag to 12.4 mag (the magnitude of the asteroid) for at most 8.7
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: 62
    * date and approx. time of event: 2009 Jul 25, 11:11  - 2009 Jul 25, 11:26  UT
    * midpoint of event [JD]: 2455037.97174167
    * magnitude of target star: 12.0
    * magnitude drop [mag]: 1.0
    * estimated maximum duration : 8.7
    * Moon: 16 % sunlit, 118° distance
    * Sun: 166° distance
    * rough path description: Hawaii

The occultation path
--------------------
    * approximate projected width [km]: 118
    * 1 sigma uncertainty interval [path widths]: +/- 0.98
    * 1 sigma uncertainty interval [seconds]: +/- 7.9
    * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .083 +/- .082)
    * 1 sigma uncertainty ellipse (major, minor, PA): ( .083", .082", 90° )
    * approx speed of asteroid's shadow [km/s]: 11.0738
    * website for maps:
          http://www.asteroidoccultation