(Discovery of superhumps by Gianluca Masi, Alessia Cassetti)
(Superhumps by Gordon Garradd)
P. Schmeer detected the first ever recorded outburst (15mag) on February 5 (vsnet-alert 4118). The object was selected as an optical counterpart of the ROSAT source. The optical spectrum suggests a dwarf nova, and was proposed for further monitoring. The quiescent magnitude was reported as 18, but the V-band photometry at the Ouda station set an upper limit of 18.3 (vsnet-alert 4124). A V-band CCD chart was issued as [vsnet 889]. G. Masi and A. Cassetti performed CCD time-series photometry on February 5 and confirmed the outburst (vsnet-alert 4119). They presented a CCD image of the field at: http://www.eurolink.it/comets/rxtau.jpg (vsnet-alert 4121). From their observation, they confirmed clear superhumps with an amplitude of about 0.4-0.5mag, which gave an evidence that RX J0459.7+1926 is a new member of SU UMa-type dwarf nova (vsnet-alert 4122, 4123).
T. Vanmunster also confirmed the presence of the superhumps (vsnet-alert 4125). Using the VSNET collaboration data (G. Masi, A. Cassetti, G. Garradd, and the Kyoto team), G. Masi reported a superhump period to be 0.07060 d (vsnet-alert 4126, 4129, 4165).