Asteroid occultation : Aug 04, 2010

Exoplanet occultation, asteroid occultation,
solar research, comet observation, astrometry, etc.
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PTS
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註冊時間: 週日 28 10月, 2007 08:50
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Asteroid occultation : Aug 04, 2010

文章 PTS » 週日 04 7月, 2010 12:15

Hi,
Here is the details and finder charts of this event.
See also:
http://forum.hkas.org.hk/viewthread.php ... a=page%3D1


PTS
------------- IOTA/IOTA-ES occultation update for
(2621) Goto / TYC 6867-00686-1 event on 2010 Aug 04, 14:21 UT
Visible from Japan, China, India


Summary
-------
On 2010 Aug 04 UT, the 47 km diameter asteroid (2621) Goto will occult a 11.4
mag star in the constellation Sagittarius for observers along a path across
Japan, China, India.

In the case of an occultation, the combined light of the asteroid and the star
will drop by 3.8 mag to 15.2 mag (the magnitude of the asteroid) for at most 5.4
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: 46
* date and approx. time of event: 2010 Aug 04, 14:12 - 2010 Aug 04, 14:28 UT
* magnitude of target star: 11.4
* magnitude drop [mag]: 3.8
* estimated maximum duration [s]: 5.4
* Moon: 36 % sunlit, 139° distance
* Sun: 147° distance
* rough path description: Japan, China, India

The occultation path
--------------------
* approximate projected width [km]: 66
* 1 sigma uncertainty interval [path widths]: +/- 1.40
* 1 sigma uncertainty interval [seconds]: +/- 9.1
* 1 sigma uncertainty interval approx RA,DE ["]: (+/- .065 +/- .041)
* 1 sigma uncertainty ellipse (major, minor, PA): ( .065", .040", 95° )
* approx speed of asteroid's shadow [km/s]: 8.6547
* website for maps:
http://www.asteroidoccultation.com
----------------------------
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PTS
夸克星
文章: 17250
註冊時間: 週日 28 10月, 2007 08:50
來自: HK

文章 PTS » 週一 02 8月, 2010 14:56

Just a reminder.
Hope it remains clear late on Wednesday.


PTS

PTS
夸克星
文章: 17250
註冊時間: 週日 28 10月, 2007 08:50
來自: HK

This event was observed - but .....

文章 PTS » 週四 05 8月, 2010 08:59

The transparency was very poor last night, estimated to be ~1.5/5 and only the Summer Triangle was visible.

The target star was located after hopping around the target coordinate for some 10 minutes, and with the camera integration adjusted to 256 (resulting in some 8 secinds of exposure, which is not quite useful for occultation timing).

The video recording was started before UTC 14:00, and lasted until UTC 14:29 ( nearly 8 GB of data). The integration was adjusted to 64 (exposure~>2 second), and the event was visually monitored by all 5 of us. No occultation was observable.

As the predicted maximum duration of the occultation was just 5.4 seconds (maybe much shorter as we are near the red-limit) we cannot rule out if an occultation. We need to process the AVI clip much more carefully to detect any dimming. This task will be very difficult, if not entirely impossible, due to the interference of the cloud/fog/smog, and the image brightness was not quite stable anyway.

All we dare to say at this moment is : if there was indeed an occultation, the duration was much shorter than 2 seconds.

PTS

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