AAVSO Special Notice #71

Next HST cataclysmic variable scheduled
October 11, 2007

The next HST object from Paula Szkody's program is scheduled
to be observed during the week of October 29 through November 3.
This is SDSS J074531.92+453829.5, another cataclysmic variable
that is about V=19.1 at quiescence, and unknown brightness in outburst
since it has never been observed to outburst.  The coordinates are:

07:45:31.92 +45:38:29.5 J2000

and the AAVSO Harvard Designation and name is

0738+45  SDSS074545 

We will send out another notice when the actual observation
dates are fixed by the HST scheduling staff.

Dr. Szkody requests monitoring coverage of this object beginning
now, and with intensive coverage for the 24hrs prior to the HST
observation. The primary requirement, as for the PQ And campaign
mentioned in Alert Notice 356:
http://www.aavso.org/publications/alerts/alert356.shtml
is that we need to show that SDSS074545 is faint enough to safely
observe with the Hubble Space Telescope.  Charts for this star
can be generated using VSP, currently by inputting the coordinates
(search by name will be added shortly).  There are nice comparison
stars near the CV; you may pick any one of these when reporting
a fainter-than limit.  A USNO-Flagstaff finding-image will be
placed on the campaign webpage shortly.

Note that this object is a morning target, so we need geographical
coverage to ensure that we can detect any beginning of an outburst.

This campaign is being organized at AAVSO HQ by Dr. Matthew Templeton.

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