[vsnet-sequence 149] (fwd) 1RXP J113123+4322.5 CCD Photometry and Astrometry (D. West)

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

(fwd) 1RXP J113123+4322.5 CCD Photometry and Astrometry (D. West)

Date: Wed, 06 Mar 2002 12:56:32 EST
From: DWest61506@aol.com
Subject: 1RXP J113123+4322.5 CCD Photometry and Astrometry

I measured 1RXP J113123+4322.5 on 6.160 March 2002 UT at V = 13.45 +/- 0.06.  The equipment used wa
s a 0.2 m SCT + ST-8 CCD + V filter.  The comparison stars used were GSC 3015:1120 and GSC 3015:148
5.

Since I was not aware of a photometric sequence for this star, I measured the following stars diffe
rentially with respect to SAO 43786, V = 6.67, B-V = 0.91.  These magnitudes have not been correcte
d for color differences and the error reflect this.

GSC 3015:1662     V = 12.29 +/- 0.06
GSC 3015:1602     V = 13.07 +/- 0.07
GSC 3015:1485     V = 12.50 +/- 0.06
GSC 3015:1120     V = 11.84 +/- 0.06

The position of 1RXP J113123+4322.5 was measured to be 11 31 22.09 +43 22 36.1 +/- 0.5".  This posi
tion is based on a plate solution using 14 GSC 1.1 stars.  Both the photometry and astrometry is a 
combination of the star under study and a faint companion that is at a separation of 5.14" and a po
sition angle of 347 degrees.  This measurement is based on a POSS II DSS2/STS cl J(Blue) epoch 1990
.001 plate.  I estimate the fainter companion to be 2-3 magnitudes fainter than 1RXP J113123+4322.5
 in the quiescent state. 

An image of the field is available upon request.

Regards,
Doug West
Mulvane, KS, USA

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