AAVSO Special Notice #72: 1RXS_J023238.8-371812 rapid fading

A new large-amplitude cataclysmic binary, most likely
a WZ Sge system, was discovered by K. Malek of
the "Pi of the Sky" team in mid-September.  It has
been linked to the following ROSAT RASS object:
1RXS_J023238.8-371812
and has coordinates of
02:32:38.13 -37:17:54.7 J2000
It was about 11th magnitude upon discovery, and displayed
superhumps with period 0.066d.

Starting about 2007 October 11, this CV began a
dramatic fade in brightness and is now about V=16.
The possible progenitor is a star about 18th magnitude,
so the CV is rapidly approaching its pre-outburst
brightness.  It is highly likely that an echo-outburst
will take place within a week or so, and we recommend
that observers continue to follow this object through
the current season.  You can create a finding chart
for the CV using VSP:
http://www.aavso.org/observing/charts/vsp/
and submit data to the AAVSO using the designations:
0228-37  RXSJ023238
A photometric calibration for the field can be found at:
ftp://ftp.aavso.org/public/calib/rxj0232.dat

Good luck and clear skies!
Arne Henden

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