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CCD
photometry of the suspected UGSU-type
dwarf nova SDSS J155644.24-000950.2
I collected two nights of CCD photometry
observations of SDSSJ155644.24-000950.2, a suspected
UGSU-type dwarf nova that was detected in outburst
by Hiroyuki Maehara on May 25th, 2005. I observed
this variable star on May 25, 2005 during 3 hours
(152 useful frames) and on May 27, 2005 during 3
hours (about 133 useful frames). The resulting light
curve (see below) shows the object rising to maximum
during the first night (May 25/26) and already
declining during the second night (May 27/28), with
no obvious modulations (see insets). Therefore, this
was either a normal outburst or the object is not an
UGSU-type dwarf nova. Follow-up observations during
future outbursts will tell.
CCD photometry of SDSS
J155644.24-000950.2 on May 25/26, 2005 and May
27/28, 2005
0.35-m f/6.3 SCT, unfiltered exposures with ST-7 and
ST-7XME CCD cameras.
In addition, the above data set comprises my
250.000th CCD observation, obtained at CBA Belgium
Observatory, and submitted to CBA, AAVSO and other
organisations. I started doing CCD photometry in May
1996 (after a long 'career' as a visual observer),
and meanwhile collected variable star photons for
over 4775 hours, which is the equivalent of almost
200 days of uninterrupted photometry.
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Copyright © 2005 - Tonny Vanmunster.
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