Asteroid occultation in the early morning of Christmas Day

Exoplanet occultation, asteroid occultation,
solar research, comet observation, astrometry, etc.
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夸克星
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Asteroid occultation in the early morning of Christmas Day

文章 PTS » 週六 18 12月, 2010 12:11

Hi,
Attached are finder charts from DSS and The Sky 6

PTS
*************************************

IOTA/IOTA-ES occultation update for
(634) Ute / TYC 0738-01248-1 event on 2010 Dec 24, 18:32 UT
Visible from S China, SW Asia, Europe, Africa


Summary
-------
On 2010 Dec 24 UT, the 69 km diameter asteroid (634) Ute will occult a 11.5 mag
star in the constellation Orion for observers along a path across S China, SW
Asia, Europe, Africa.

In the case of an occultation, the combined light of the asteroid and the star
will drop by 2.5 mag to 13.9 mag (the magnitude of the asteroid) for at most 5.0
seconds.

This update is based on UNSO/Flagstaff astrometry for the asteroid kindly
provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill
Owen, historical astrometry from the MPC files (via AstDys), and the following
catalogs for the star position: UCAC.

The event at a glimpse
----------------------
* Rank: 78
* date and approx. time of event: 2010 Dec 24, 18:24 - 2010 Dec 24, 18:39 UT
* magnitude of target star: 11.5
* magnitude drop [mag]: 2.5
* estimated maximum duration [s]: 5.0
* Moon: 86 % sunlit, 44� distance
* Sun: 168� distance
* rough path description: S China, SW Asia, Europe, Africa

The occultation path
--------------------
* approximate projected width [km]: 73
* 1 sigma uncertainty interval [path widths]: +/- 0.70
* 1 sigma uncertainty interval [seconds]: +/- 3.7
* 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .032)
* 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .032", 85� )
* approx speed of asteroid's shadow [km/s]: 13.9211
* website for maps:
http://www.asteroidoccultation.com
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