[vsnet-chat 4630] Re: Suspect object of yesterday and another point

[Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>]

Dear all,

>I want submit at your attention another object observed at position
>
>AR 20 42 03.393
>Decl. +40 18 10.66
>m1~10.8
>
>Very close to this position, in my Atlas Megastar, there ar two objects:
>GSC 3170:1706 AR 20 42 00.72 decl. +40 17 53.5 reported as a star with =
>m1~12.9/0.4
>and
>GSC 3170:877 AR 20 42 02.94 decl. +40 18 14.2 reported with NOSTAR =
>m1~11.0/0.4
>
>The object, that is real because is visible on 3 images, is not visible =
>on image taken at 2001/07/11.86.

It is definitely GSC 3170-877 (GSCmag = 10.96, USNO-A2.0 rmag = 11.6,
bmag = 12.3).  This "star" is actually triplet (within 5-6"), so the
change of the sky condition can affect the visibility of them.  The
2MASS catalog lists them separately as a rather dim IR source, so they
are unlikely to be red variables.

Toni, you should make comparison with some archived image, such as the
digitized sky survey.  It is accessible from Web, for example, 
http://archive.stsci.edu/dss .

Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp

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