Asteroid occultation event on July 22

PTS

Hi,
Here is another asteroid occultation event on July 22.
See also:

http://occultation.freebbs.hk/thread-5670-1-1.html

I've prepared finder charts from the Digital Sky Survey.


PTS


--------------------------------------------------------
IOTA/IOTA-ES occultation update for
          (337) Devosa / 2UCAC 17836255 event on 2009 Jul 22, 15:26 UT
                      Visible from Taiwan, Hong Kong, China


Summary
-------
On 2009 Jul 22 UT, the 59 km diameter asteroid (337) Devosa will occult a 11.5
mag star in the constellation Sagittarius for observers along a path across
Taiwan, Hong Kong, China.

In the case of an occultation, the combined light of the asteroid and the star
will drop by 1.4 mag to 12.5 mag (the magnitude of the asteroid) for at most 5.0
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: 71
    * date and approx. time of event: 2009 Jul 22, 15:21  - 2009 Jul 22, 15:31  UT
    * midpoint of event [JD]: 2455035.143225
    * magnitude of target star: 11.5
    * magnitude drop [mag]: 1.4
    * estimated maximum duration : 5.0
    * Moon: 1 % sunlit, 156° distance
    * Sun: 163° distance
    * rough path description: Taiwan, Hong Kong, China

The occultation path
--------------------
    * approximate projected width [km]: 105
    * 1 sigma uncertainty interval [path widths]: +/- 0.81
    * 1 sigma uncertainty interval [seconds]: +/- 2.9
    * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .039)
    * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .033", 359° )
    * approx speed of asteroid's shadow [km/s]: 11.9372
    * website for maps:
          http://www.asteroidoccultation.com