[vsnet-chat 4014] Re: Object Near GSC 770

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

Dear Toni and all,

>I want know your comment on this image that show the object sa00x04 
>(approximate astrometric position A.R 17 36 32.22  decl. -23 47
>47.5),  near the star GSC 6827:770 A.R. 17 36 27.13 decl. -23 47
>56.7. m1~11.4/0.4.

Possibly it seems to be an USNO_A2.0 star (star A);
U0600_27762391  17:36:30.794  -23:47:32.64  r=14.1 b=16.2

On DSS2 R plate, this star is dimmer than the neighbouring USNO_A2.0
stars at position end figures 32s.107, 15".58 (r=15.7, star B) and
32s.220, 37".39 (r=16.0, star C).  Thus, it can be a variable with
somewhat large amplitude.  

V2220 Oph (Mira) is also neighbouring, but it is another star.  The
chart of V2220 Oph (Terzan and Rutily, 1972, A&Ap, 16, 408, Fig. 4)
shows no counterpart of star A, on the other hand stars B and C are
clearly detected.  

# Comparing DSS2 with Terzan and Rutily chart, V2220 Oph should be
# identical with an red USNO star at 17:36:42.185, -23:49:16.32
# (J2000.0), whose r=15.0 and b=18.2.  The GCVS position of V2220 Oph
# should be revised, as well as the variables referring the same
# paper.

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

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