[vsnet-alert 7284] UV Gem April 2002 superoutburst - refined superhump period

["Tonny Vanmunster" <Tonny.Vanmunster@advalvas.be>]

Dear colleagues,

The April 2002 outburst of UV Gem provided a good opportunity for
time-series (unfiltered) photometry of this object. I was able to follow the
variability of the object during 3 nights, between 2002, Apr 07 and Apr 10.
I collected 331 UV Gem observations at CBA Belgium Observatory, using a
0.35-m f/6.3 telescope and ST-7 CCD, corresponding to a total time period of
6.90 hours of data.

The SU UMa dwarf nova nature of this object was first announced by myself,
during the December 1999 superoutburst (vsnet-alert 3821). On the basis of
4.4 hours of observations, obtained on 1999, December 13/14, I derived a
superhump period of 0.0902 +/- 0.0006 d  or  2.17h.

My April 2002 observations yield a slightly different - improved - superhump
period of 0.0926 +/- 0.0010 d  or  2.22h, using the PDM technique. The
superhump amplitude was 0.32 mag.

The period diagram and phase diagram for the April 2002 analysis are shown
on my web site www.lunarpages.com/cbabelgium. The object faded with an
average of 0.10 mag per night. This is again a characteristic value for SU
UMa type dwarf novae.

Kind regards,
Tonny Vanmunster
CBA Belgium Observatory
www.lunarpages.com/cbabelgium

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