Finder charts for April 28 asteroid occultation event

PTS

Hi,
Here are the charts for the April 28 event.  Charts are 15 x 15 arcmin.
Details can be found here:
http://occultation.freebbs.hk/thread-2162-1-1.html

or:
IOTA/IOTA-ES occultation update for
        (971) Alsatia / TYC 2422-00868-1 event on 2008 Apr 28, 14:29 UT
                               Visible from China


Summary
-------
On 2008 Apr 28 UT, the 64 km diameter asteroid (971) Alsatia will occult a 9.7
mag star in the constellation Auriga for observers along a path across China.

In the case of an occultation, the combined light of the asteroid and the star
will drop by 5.3 mag to 15.0 mag (the magnitude of the asteroid) for at most 1.8
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: 77
    * date and approx. time of event: 2008 Apr 28, 14:30  - 2008 Apr 28, 14:32  UT
    * midpoint of event [JD]: 2454585.10379583
    * magnitude of target star: 9.7
    * magnitude drop [mag]: 5.3
    * estimated maximum duration : 1.8
    * Moon: 51 % sunlit, 149° distance
    * Sun: 59° distance
    * rough path description: China

The occultation path
--------------------
    * approximate projected width [km]: 68
    * 1 sigma uncertainty interval [path widths]: +/- 0.73
    * 1 sigma uncertainty interval [seconds]: +/- 1.2
    * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .025)
    * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .024", 358° )
    * approx speed of asteroid's shadow [km/s]: 34.5692
    * website for maps:
          http://www.asteroidoccultation.com