[vsnet-alert 9722] AAVSO Special Notice #82: Update on possible X-ray transient/Nova

[Arne Henden]

AAVSO Special Notice #82

Update on possible X-ray transient/Nova
November 19, 2007

Further to AAVSO Special Notice #81, precise coordinates for the optical
counterpart of the new X-ray source XMMSL1 J070542.7-381442 (Read et al.,
ATEL 1282) have been determined.  The (J2000) coordinates are

RA 07:05:42.51 (+/- 0.05 arcsec) , Dec -38:14:39.3 (+/- 0.08 arcsec)

Coordinates were determined by A. Henden using V-band images supplied by
S. Dvorak.

This object has now been entered into the AAVSO Variable Star Index (VSX)
as: VSX J070542.5-381439

The VSX information page may be reached via the following URL:
http://www.aavso.org/vsx/index.php?view=detail.top&oid=161061

Charts may be generated with VSP using the following URL:
http://www.aavso.org/observing/charts/vsp/index.html?pickname=VSX%20J070542.5-381439

A full sequence for this object is not yet available.  The bright star
HD 53893 (RA 07:05:00.720 , Dec -38:20:58.66 ) with V = 9.449
(Kharchenko 2001) may be used as a photometric comparison star.  As
stated in Special Notice #81, unfiltered photometry is not recommended
due to the presence of numerous emission lines in the spectrum.

Please submit data on this object to the AAVSO as "VSX J070542.5-381439".

This AAVSO Special Notice was prepared by Matthew Templeton.

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