V402 And: New member of SU UMa-type dwarf nova

G. Poyner reported in [vsnet-alert 5268] that M. Mobberley detected an outburst of this poorly known dwarf nova on September 20 (15.7mag). T. Vanmunster had <17.0 on a CCD image taken on September 18. T. Kato confirmed the reported outburst at Ouda Station, Kyoto University on September 21 (V=15.3) (vsnet-campaign 506). He also reported the clear presence of superhumps in the light curve obtained on September 21. This revealed V402 And is a new SU UMa-type dwarf nova (vsnet-campaign 508). The quiescent magnitude of the coincident USNO star indicates the outburst amplitude of this star is around mag 4, which is rather small as a typical SU UMa stars (vsnet-campaign-dn 153). T. Kato reported the amplitude of the superhumps are almost constant around 0.25mag (vsnet-campaign-dn 155), and calculated the best candidate of the superhump period to be 0.0634 d using the data observed at Ouda and by J. Pietz (vsnet-campaign-dn 161). The VSNET collaboration team revealed the superhump period is calculated to be 0.06343 d (vsnet-campaign-dn 170).

Light Curve and General Information of This Object