Finder charts for April 17 2008 asteroid occultation

PTS

Hi,
Here is the second event for April, 2008:
IOTA/IOTA-ES occultation update for
          (2448) Sholokhov / HIP  59169 event on 2008 Apr 17, 18:50 UT
                  Visible from Hong Kong, China, Russia, Europe


Summary
-------
On 2008 Apr 17 UT, the 30 km diameter asteroid (2448) Sholokhov will occult a
9.3 mag star in the constellation Coma Berenices for observers along a path
across Hong Kong, China, Russia, Europe.

In the case of an occultation, the combined light of the asteroid and the star
will drop by 5.0 mag to 14.3 mag (the magnitude of the asteroid) for at most 5.3
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: 37
    * date and approx. time of event: 2008 Apr 17, 18:31  - 2008 Apr 17, 19:01  UT
    * midpoint of event [JD]: 2454574.28414583
    * magnitude of target star: 9.3
    * magnitude drop [mag]: 5.0
    * estimated maximum duration : 5.3
    * Moon: 93 % sunlit, 25° distance
    * Sun: 138° distance
    * rough path description: Hong Kong, China, Russia, Europe

The occultation path
--------------------
    * approximate projected width [km]: 32
    * 1 sigma uncertainty interval [path widths]: +/- 1.77
    * 1 sigma uncertainty interval [seconds]: +/- 11.9
    * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .062 +/- .045)
    * 1 sigma uncertainty ellipse (major, minor, PA): ( .062", .044", 98° )
    * approx speed of asteroid's shadow [km/s]: 5.7232
    * website for maps:
          http://www.asteroidoccultation.com

WCYue

按照最新軌道數據，見掩區域由東北向西南偏移，香港大部份地區在見掩範圍。同時南北界限線亦在本港區域以內，是一次難得可以在香港完全量度小行星位置數據及形狀機會。

[ 本帖最後由 WCYue 於 2008-4-12 04:23 編輯 ]

WCYue

見掩區，詳細資料請參閱掩星組  http://occultation.freebbs.hk/thread-2160-1-1.html