Asteroid occultation tonight!

[PTS]

Hi,
Sorry for this late posting. The occultation will take place in 5 hours.
We'll be observing at Hokoon.
Attached are finder charts from the Digital Sky Survey and The Sky 6.

Please refer also to WC Yue's posting:
http://forum.hkas.org.hk/viewthread.php ... a=page%3D1



PTS

===================================================
IOTA/IOTA-ES occultation update for
(690) Wratislavia / UCAC2 40477076 event on 2010 Nov 01, 18:05 UT
Visible from Japan, S China, SE Asia


Summary
-------
On 2010 Nov 01 UT, the 135 km diameter asteroid (690) Wratislavia will occult a
12.0 mag star in the constellation Taurus for observers along a path across
Japan, S China, SE Asia.

In the case of an occultation, the combined light of the asteroid and the star
will drop by 1.0 mag to 12.5 mag (the magnitude of the asteroid) for at most
21.7 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: 88
* date and approx. time of event: 2010 Nov 01, 17:51 - 2010 Nov 01, 18:22 UT
* magnitude of target star: 12.0
* magnitude drop [mag]: 1.0
* estimated maximum duration [s]: 21.7
* Moon: 26 % sunlit, 77?distance
* Sun: 137?distance
* rough path description: Japan, S China, SE Asia

The occultation path
--------------------
* approximate projected width [km]: 136
* 1 sigma uncertainty interval [path widths]: +/- 0.55
* 1 sigma uncertainty interval [seconds]: +/- 10.8
* 1 sigma uncertainty interval approx RA,DE ["]: (+/- .049 +/- .054)
* 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .049", 0?)
* approx speed of asteroid's shadow [km/s]: 6.2106
* website for maps: