Asteroid occultation in the early morning of Oct 30, 2011

[PTS]

Hi,
Here are the finder charts from the Blue and Red plates of DSS, each being 15 x 15 arcmin.
See also:
http://forum.hkas.org.hk/viewthread.php ... a=page%3D1

pts
*************************
IOTA/IOTA-ES occultation update for
(530) Turandot / HIP 48060 event on 2011 Oct 29, 19:36 UT
Visible from Taiwan, S China, SE Asia


Summary
-------
On 2011 Oct 29 UT, the 99 km diameter asteroid (530) Turandot will occult a 7.5
mag star in the constellation Leo for observers along a path across Taiwan, S
China, SE Asia.

In the case of an occultation, the combined light of the asteroid and the star
will drop by 8.5 mag to 16.0 mag (the magnitude of the asteroid) for at most 4.5
seconds.

This update is based on UNSO/Flagstaff astrometry for the asteroid kindly
provided by Hugh Harris, historical astrometry from the MPC files (via AstDys),
and the following catalogs for the star position: .

The event at a glimpse
----------------------
* Rank: 97
* date and approx. time of event: 2011 Oct 29, 19:32 - 2011 Oct 29, 19:35 UT
* geocentric midpoint of event [JD]: 2455864.31738333
* magnitude of target star: 7.5
* magnitude drop [mag]: 8.5
* estimated maximum duration [s]: 4.5
* Moon: 13 % sunlit, 113° distance
* Sun: 71° distance
* rough path description: Taiwan, S China, SE Asia

Additional comments
-------------------
pm issue

The occultation path
--------------------
* approximate projected width [km]: 99
* 1 sigma uncertainty interval [path widths]: +/- 0.39
* 1 sigma uncertainty interval [seconds]: +/- 2.8
* 1 sigma uncertainty interval approx RA,DE ["]: (+/- .022 +/- .013)
* 1 sigma uncertainty ellipse (major, minor, PA): ( .022", .013", 93° )
* approx speed of asteroid's shadow [km/s]: 21.9800
* website for maps:
http://www.asteroidoccultation.com

[PTS]

The target star is very bright, so those with small telescopes can take part.


pts

[PTS]

It was a MISS.
We observed at Hokoon.

Using setting 8 (256 frames, equivalent to 8 minute exposure), 2 faint stars (GSC834:1235, mag-13.2, and GSC834-322, mag-14.0) were recorded.

Video recording started at 19:25 UTC. The target star (SAO98773, mag-7.52) was very bright, and the transparency was good when there was no cloud. We were able to record at the full speed of 30 fps, using exposure time of 1/60 s.

Visual observation was carried out on the video screen : no occultation was observed when we stopped the recording at 19:45.

pts

[PTS]

After extracting the frames from the video recording (from 19:30 through 19:33 UTC) the star SAO98773 was visible in every frame.
This confirms the MISS.


pts

[lawrencemok]

so where does the Asteroid gone?

[PTS]

so where does the Asteroid gone?

We have to wait for the results of other observers.

pts

[PTS]

so where does the Asteroid gone?

We have experienced such before.
On June 17, 2009, asteroid #146 (Lucina) was predicted to occult a 11th mag star in Virgo. Hong Kong was far outside the occultation path. However, we did see the occultation at Hokoon.
Please see the following link:

http://forum.hkas.org.hk/viewthread.php ... =page%3D27


pts

[zyeks]

請到下列二個網頁
http://mavang2.tripod.com/square/index.html
http://mavang2.tripod.com/square/index_english.html

[PTS]

請到下列二個網頁
http://mavang2.tripod.com/square/index.html
http://mavang2.tripod.com/square/index_english.html

What is the relevance of these?


pts