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In vsnet-campaing-dn 3847, Taichi Kato wrote : >V589 Her outburst> > > As reported by Carlo Gualdoni and Patrick Schmeer, the suspected SU UMa- >type dwarf nova V589 Her is undergoing an outburst. Although there has >been a claim of superhump detection, this needs to be confirmed by more >systematic observations. V699 Oph and V1141 Aql being priority targets, >V589 Her would be regarded as the "second priority target". If you have >a second telescope, please make it a try. I detected superhumps during 3 nights of the April 2002 superoutburst of this system (see www.cbabelgium.com for full details about the observations, including CCD photometry, periodogram and phase diagrams). In fact, V589 Her could be a very interesting SU UMa-type dwarf nova, as it derived a superhump period of about 0.0947 d, which is inside the so called 'period gap'. In VSNET message "vsnet-campaign-dn 2270", Taichi remarked that the amplitude of the system (about 3 mag) might be too small for an SU UMa-type of object. However, there may be a possibility that the true quiescence of V589 Her is fainter than what was inferred from DSS/USNO/ Henden magnitudes, or that the modulations I observed, have a different nature from usual superhumps (lower amplitude, more irregular profile). In the latter case, the object might be an unusual SU UMa-type system. So, sufficient amounts of unknowns to turn this object into a priority target, provided the present outburst is a superoutburst. Best regards, Tonny Vanmunster CBA Belgium Observatory www.cbabelgium.com
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