RX J1450.5+6403: A new member of SU UMa-type dwarf nova

T. Vanmunster discovered an outburst of RX J1450.5+6403 on 14 May at 14.4mag (vsnet-alert 4834). D. Nogami confirmed the object to be in quiescence on May 11.10 (UT) (vsnet-alert 4837). T. Vanmunster detected superhumps with the period of 0.0617d, and revealed the current outburst is a superoutburst of a newly discovered SU UMa-type dwarf nova. R. Novak performed period analysis using his data and provided the period of 0.0602(2)d on 16 May (vsnet-campaign 71). T. Vanmunster revised the superhump period to 0.0600(2)d using the data before 16 May obtained by CBA team (vsnet-alert 4852). He also reported a slightly increased superhump period of 0.0606(5)d using the data obtained by J. Kemp on May 18/19 (vsnet-alert 4870). The spectroscopic period of either 0.0588 or 0.0599 d was provided by Thorstensen (vsnet-alert 4848). The quiescent photometry obtained at Nyrola observatory team shows a sharp periodicity at 0.0289 d which is pretty close to the half of the spectroscopic period. The feature is quite reminiscent of other short-period SU UMa systems and possible eclipses are suggested (vsnet-campaign 81, 82). D. Nogami analyzed their quiescent data just before the outburst (7, 10, and 11 May) and provide a period estimation of 0.056 d (vsnet-alert 4868). In the data obtained by R. Novak, there are significant QPOs superimposed on the fading branch of superhumps (vsnet-campaign 83). The QPOs are confirmed by T. Vanmunster (vsnet-alert 4870). T. Vanmunster reported that this newly discovered SU UMa-type dwarf nova entered the rapid decline phase after first detected superoutburst (vsnet-alert 4885).

E. Pavlenko reported this SU UMa star was brightened up to R=14.8 on 25/26 June, and the mean magnitude of 24/25 June was R=16.6 (vsnet-campaign 252). On June 26, T. Vanmunster confirmed the outburst (15.9mag), which implied the outburst was short and faint (vsnet-campaign 258). The observation on June 27 by A. Henden also agree with the decline trend (vsnet-campaign 259). T. Vanmunster additionally reported his pre-outburst observations in [vsnet-campaign 263].

Light Curve and General Information of This Object