[vsnet-alert 4509] Re: XTE J1118+480 optical counterpart?

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

Dear all,

>I have examined Kyoto image, then am awared that the position of this
>bright object is fairly close to:
>  USNO_A1.0 1350.08089912  11:18:10.826  +48:02:12.55  18.8r 20.1b
>= USNO_A2.0 1350.07924726  11:18:10.851  +48:02:12.78  18.8r 19.4b
>
>There is no USNO star within 1' from this star, but on DSS R image
>(either generation), several fainter objects can be seen.  More
>precise astrometry is in progress.  

The astrometry of the bright (C about 13.0) object using seven GSC-ACT
stars gave that R.A. = 11h18m10s.79, Decl. = +48o02'11".2 (equinox
2000.0).  The accuracy for R.A. is about 0s.03 (standard deviation),
besides the one for Decl. is slightly poor (sigma = 0".6).  

It is strongly suggested that USNO_A1.0 1350.08089912 = USNO_A2.0
1350.07924726 is the precurser of XTE J1118+480.  On DSS2 images, no
other object can be seen within 10" from this USNO star.

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

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