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Jan 8 asteroid occultation

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發表於 2010-12-16 21:04:09 | 顯示全部樓層 |閱讀模式


    IOTA/IOTA-ES occultation update for
          (212) Medea / TYC 1839-00696-1 event on 2011 Jan 08, 11:47 UT
                  Visible from W USA, Japan, S China, SE Asia


Summary
-------
On 2011 Jan 08 UT, the 136 km diameter asteroid (212) Medea will occult a 10.0
mag star in the constellation Taurus for observers along a path across W USA,
Japan, S China, SE Asia.

In the case of an occultation, the combined light of the asteroid and the star
will drop by 2.7 mag to 12.7 mag (the magnitude of the asteroid) for at most
19.4 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: 99
    * date and approx. time of event: 2011 Jan 08, 11:32  - 2011 Jan 08, 11:59  UT
    * magnitude of target star: 10.0
    * magnitude drop [mag]: 2.7
    * estimated maximum duration : 19.4
    * Moon: 16 % sunlit, 98?distance
    * Sun: 145?distance
    * rough path description: W USA, Japan, S China, SE Asia

The occultation path
--------------------
    * approximate projected width [km]: 138
    * 1 sigma uncertainty interval [path widths]: +/- 0.26
    * 1 sigma uncertainty interval [seconds]: +/- 5.4
    * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .025)
    * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .025", 86?)
    * approx speed of asteroid's shadow [km/s]: 7.0044
    * website for maps:
          http://www.asteroidoccultation.com
發表於 2010-12-18 11:49:12 | 顯示全部樓層
I have prepared finder charts fromDSS for this event.

from Blue Plates, 15 x 15 arcmin

from Blue Plates, 15 x 15 arcmin

from RED Plates, 15 x 15 arcmin

from RED Plates, 15 x 15 arcmin

from The Sky 6

from The Sky 6
發表於 2011-1-8 10:11:35 | 顯示全部樓層
Reminder.
The weather forcast is favorable.

PTS
發表於 2011-1-8 15:59:00 | 顯示全部樓層
I have added the position of the asteroid in this new finder chart (at about 4:00 pm today)

PTS
skymap1.jpg
發表於 2011-1-9 08:18:28 | 顯示全部樓層
WC Yue, Gloria and I observed at Hokoon.
The asteroid was bright and visible together with several 13-mag stars around the target star.
When the two seemed merged, video recording was started using 30 fps.
analysis of the timing will be completed today, and report will be sent tomorrow.

PTS
j0013 11-01-08 19-07-20.jpg
j0046 11-01-08 19-23-50.jpg
j0068 11-01-08 19-37-29.jpg

評分

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發表於 2011-1-9 08:51:35 | 顯示全部樓層
Preliminary results:

start of occultation:  11:54:05.645 (+/-0.017) UTC
end of occultation:    11:54:20.306 (+/-0.017) UTC

Duration : 14.661s (+/-0.033 s)

PTS
發表於 2011-1-9 08:56:22 | 顯示全部樓層
Congratulations!
發表於 2011-1-10 09:03:33 | 顯示全部樓層
Hi,
Here is the preliminary reduced data of Asteroid Medea from this occultation event.


PTS
20110108-medea-red.gif

20110108_Medea2.pdf

18.53 KB, 下載次數: 34

發表於 2011-1-11 16:26:04 | 顯示全部樓層
Patric Lau's data is also included.

PTS
20110108medea-red1.gif
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