RX Cha: possible new SU UMa star An analysis of time-series CCD photometry of RX Cha on Sep. 16 (vsnet-obs 16007, http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/obs16000/msg00007.html vsnet-obs 16008, http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/obs16000/msg00008.html) has yielded a 0.2-mag modulation suggesting the presence of superhumps. The likely period is 0.08 d. Together with the large outburst amplitude (the astrometry by Garradd has confirmed that the object is below the limit of USNO catalog in quiescence), the present observation strongly suggests that RX Cha belongs to the SU UMa-type subclass of dwarf novae. Regards, Taichi Kato and Gordon Garradd