Dear Makoto, I have pleasure confirming your findings on 1RXS J232953.9+062814. I have just finished (due to clouds) an unfiltered observing run on this object (Nov 5/6, 2001), and the resulting light curve indeed is quite spectacular, showing superhumps with an amplitude of 0.2 mag and a period of about ~0.043d. I will make the data available on my web site later tomorrow. With kind regards, Tonny Vanmunster CBA Belgium Observatory http://vsnet.lunarpages.com/cbabelgium email : Tonny.Vanmunster@advalvas.be > -----Original Message----- > From: owner-vsnet-alert@kusastro.kyoto-u.ac.jp > [mailto:owner-vsnet-alert@kusastro.kyoto-u.ac.jp]On Behalf Of Makoto > Uemura > Sent: Monday 5 November 2001 20:57 PM > To: vsnet-campaign@kusastro.kyoto-u.ac.jp; > vsnet-alert@kusastro.kyoto-u.ac.jp > Subject: [vsnet-alert 6836] 1RXS J232953.9+062814: strong humps > > > 1RXS J232953.9+062814: strong humps with a very short period > > Our reduction of the last night data is now ongoing. The preliminary > light curve is very impressive. We can see three humps with amplitudes > of 0.3 - 0.4mag in our first 2.9 hours run. Our period analysis > yields the period of 0.04320(79) d. The fast-rise slow-decline profile > of these humps strongly indicates that these are superhumps. > In this part of the light curve, the object rapidly faded with a rate of > 2 mag/day. Confirmations of the current status of this object are > very urged. > > The ~0.043 day period superhumps are the shortest one among hydrogen > rich cataclysmic variables except for the SU UMa-type dwarf nova, > V485 Cen. > It is possible that the humps are double peaked and its real period is > ~0.086 day. If it is the case, the orbital period of this object > may be near the lower edge of the period gap. > > Anyway, it is certain that 1RXS J232953.9+062814 is very interesting > and important object for the cataclysmic variable study. Follow-up > time-series observations are strongly encouraged. > > Regards, > Makoto Uemura, Ryoko Ishioka, and Taichi Kato > > >