MM Hya : Rare superoutburst

As reported by R. Stubbings and A. Pearce on May 14, the SU UMa-type dwarf nova MM Hya experienced a rare, bright outburst. The last superoutburst of MM Hya was observed in 2000 April. Most of outbursts of MM Hya are superoutburst, as in SW UMa and WZ Sge-type dwarf novae (vsnet-campaign 898). The object gradually faded, which indicates the outburst is a superoutburst (vsnet-campaign-dn 778). B. Warner reported that they performed a time-series observation on May 15, 16, and 17 with the 1.0-m telescope at the South African Astronomical Observatory. The light curve on May 15 shows a double humped profile and that on May 16 shows ~0.1 mag modulations with a periodicity of 80min. On May 17, 0.3mag superhumps have appeared (vsnet-campaign 904). The superoutburst continued until around June 3 when R. Ishioka found it has been fainter than 17.0mag (vsnet-campaign-dn 851, 874).

Other related articles: vsnet-campaign-dn 784, 787, 826

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