[Aavso-photometry] 1RXS J053234.9+624755 is a new very short-period UGSU-type dwarf nova

[Tonny Vanmunster]

Dear CV colleagues,

I have pleasure to announce the detection of superhumps in 1RXS
J053234.9+624755, a recently discovered CV that has been reported in
outburst by W. Kriebel (cvnet-outburst, 2005 Mar 16) and P. Schmeer
(cvnet-outburst, 2005 Mar 16) on Mar 16.8 UT, 2005.

This cataclysmic variable is located at R.A.=05h32m33.87s and
Decl.=+62o47'52.1" (J2000.0). I started a time-series photometry session on
this target at CBA Belgium Observatory on 2005, Mar 18.797 UT, using a
0.35-m f/6.3 telescope and unfiltered ST-7 CCD. The observing session is
currently still ongoing (> 4.6 hours), and the intermediate light curve
clearly shows superhumps with an amplitude of approx. 0.2 mag, superimposed
on a fading trend. A first superhump period analysis, using the ANOVA method
of Peranso, yields a value of 0.055 /+- 0.001 d, classifying this object as
a new very short-period UGSU-type dwarf nova. 

I will make the full data analysis available on my web-site
www.cbabelgium.com (and to AAVSO, CBA) later tomorrow, once all observations
have been finally reduced.

Follow-up time-resolved photometry is further encouraged, and I'd be pleased
to hear about other successful observations ...

Best regards,
Tonny Vanmunster

Tonny Vanmunster
CBA Belgium Observatory
http://www.cbabelgium.com 
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PERANSO : The Final Frontier of Period Analysis Software
http://www.peranso.com
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