[vsnet-alert 6406] Re: Suspect star

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

Dear Toni and all,

>I am analizing the Cygni field on some images taken at 2001/07/18.85
>UT and I find a suspect star at position:
>
>AR 20 24 43.88
>decl. +39 27 22.2
>
>Very close to this  position there is the star GSC 3156:1435
>m1~14.5/0.4 from GSC catalog.

Your suspect star is defenitely the other GSC-cataloged star.

GSC 3156-135  20:24:37.36 +39:25:24.0 mag=11.17
USNO-A2.0     20:24:37.39 +39:25:23.4 rmag=11.3 bmag=11.8

And, there is a neighbouring GSC-cataloged star which can make
combination in your image (separation is less than 20").

GSC 3156-78   20:24:38.95 +39:25:22.0 mag=12.44
USNO-A2.0     20:24:38.95 +39:25:21.9 rmag=12.5 bmag=13.2

Again, please make your measurement more precise.

>I Have posted the images at vsnet-image web page.

B. Skiff wrote:
>     Given the focal length of your lens, your suspect is most likely
>the combination of the two stars GSC 3156-1435 and a slightly fainter
>one only 15" away (in USNO-A2.0) being mis-measured by the software.

Probably you have not checked the vsnet-image, Brian ;-)

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

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