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Asteroid occultation event in the early morning of Oct 7

[複製連結]
發表於 2013-10-3 23:10:57 | 顯示全部樓層 |閱讀模式
Hi,
I've prepared finder charts from DSS (15x15 arcmin) and The Sky6.
Please see also:
http://occultation.freebbs.tw/vi ... &extra=page%3D1

pts
-----------------------------------------------------------------------------------

IOTA/IOTA-ES occultation update for
        (35) Leukothea / TYC 1221-00464-1 event on 2013 Oct 06, 19:56 UT
               Visible from China, SE Asia, India, Arabia, Africa


Summary
-------
On 2013 Oct 06 UT, the 112 km diameter asteroid (35) Leukothea will occult a
12.4 mag star in the constellation Aries for observers along a path across
China, SE Asia, India, Arabia, Africa.

In the case of an occultation, the combined light of the asteroid and the star
will drop by 1.9 mag to 14.0 mag (the magnitude of the asteroid) for at most 8.2
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: 80
    * date and approx. time of event: 2013 Oct 06, 19:48  - 2013 Oct 06, 20:03  UT
    * geocentric midpoint of event [JD]: 2456572.33050833
    * magnitude of target star: 12.4
    * magnitude drop [mag]: 1.9
    * estimated maximum duration : 8.2
    * Moon: 4 % sunlit, 173� distance
    * Sun: 153� distance
    * rough path description: China, SE Asia, India, Arabia, Africa

The occultation path
--------------------
    * approximate projected width [km]: 112
    * 1 sigma uncertainty interval [path widths]: +/- 0.68
    * 1 sigma uncertainty interval [seconds]: +/- 12.2
    * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .090 +/- .037)
    * 1 sigma uncertainty ellipse (major, minor, PA): ( .090", .037", 89� )
    * approx speed of asteroid's shadow [km/s]: 13.6488
    * website for maps:
          http://www.asteroidoccultation.com
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