Possible stellar occultation by a TNO - call for observation

Exoplanet occultation, asteroid occultation,
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PTS
夸克星
文章: 17242
註冊時間: 週日 28 10月, 2007 08:50
來自: HK

Possible stellar occultation by a TNO - call for observation

文章 PTS » 週六 05 1月, 2013 15:32

Dear Taksun Poon, Patrick Lau, Kenneith Hui, W. C. Yue, Wayne CHAU, Chilong Lin
(CC: Bruno Sicardy, Dr.Soma)

This is Tsutomu Hayamizu ,Japan.
I'm forwarding Bruno Sicardy's message to Asian observers.
Would you cooperate ?

Regards.


Bruno's message given below.
-------------------------------------------------------
Dear Tsutomu,,

I am contacting you about a stellar occultation by the TNO Varuna on

Jan. 8th around 20h30 UT

It was predicted months ago, but recent astrometry conducted by Jose Luiz Ortiz (Granada, Spain) and other people, using the 1.2m Calar Alto telescope, indicates a possible path on Europe or Japan, see

http://www.iota-es.de/varuna08_01_2013/ ... 12013.html

The star has R~16

Could you consider attempting the event, and distribute this alert among other people you know in Japan, or in other Asian countries?

NOTE THAT WE WILL TRY TO HAVE MORE ASTROMETRY IN THE NEXT DAYS, SO THAT THE PREDICTED PATH MAY STILL CHANGE

With my best regards, a best wishes for this New Year!

Bruno sicardy

PS. I copy this mail to Jose Luis Ortiz, and Felipe Braga, my PhD student.

Science:
Varuna is a special big TNO, extremely elongated (axis ratio~2) and fast rotating (P~6h). The main goal is to get the shape of the body, and see whether it is in hydrostatic, fluid-like equilibrium, or on the contrary, a body maintaining a distorted shape under its own internal strength.

Cheers,

Bruno

PTS
夸克星
文章: 17242
註冊時間: 週日 28 10月, 2007 08:50
來自: HK

Finder charts

文章 PTS » 週一 07 1月, 2013 15:30

I've prepared finder charts with the following FOV:

blue.jpg and red.jpg are 15 x 15 arcmin
blue-30m and red-30m are 30 x 30 arcmin

As the star is extremely dim, I cannot make a finder chart from The Sky 6 yet.

pts
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PTS
夸克星
文章: 17242
註冊時間: 週日 28 10月, 2007 08:50
來自: HK

Finder charts

文章 PTS » 週一 07 1月, 2013 15:33

Finder charts
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PTS
夸克星
文章: 17242
註冊時間: 週日 28 10月, 2007 08:50
來自: HK

Re: Finder charts

文章 PTS » 週一 07 1月, 2013 20:33

PTS 寫:Finder charts
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PTS
夸克星
文章: 17242
註冊時間: 週日 28 10月, 2007 08:50
來自: HK

No positive results received!

文章 PTS » 週三 09 1月, 2013 08:31

From the reports that come in, only 1 observer carried out the observation but the result was NEGATIVE.

All other observers, including those in Japan, Taiwan, HK, Belgium, Spain and Pic DU Midi, were all clouded out.


pts

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