[vsolj-alert 626] XTE J1118+480

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

XTE J1118+480

　山岡さんの精測が出ました。USNOの星と同定されるとのこと。こりゃ大物かも？
　京都の測光データ解析は進行中で、まもなく結果が出ると思います。

Date: Fri, 31 Mar 2000 13:25:41 +0900 (JST)
From: Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>
Subject: [vsnet-alert 4509] Re: XTE J1118+480 optical counterpart?

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

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp