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[vsnet-alert 415] superoutburst of CC Cnc



   As already reported in the AAVSO News Flash No. 18, the dwarf nova CC Cnc
is undergoing an outburst.  V-band CCD photometry at Ouda Staion (Kyoto
University) has revealed clear superhumps with an amplitude of 0.28 mag.

    mid-UT    V-C   S.D.   N  band    V-mag
  ---------------------------------   -----
  960514.496  2.091 0.084  55 V       13.99
  960515.482  2.209 0.090  76 V       14.11

  comparison: VSNET 11.90
  instruments: 60-cm telescope + CCD + V-filter
  observers: T. Kato and D. Nogami

   Determination of the superhump period is rather difficult due to the
short observing window.  The most probable period is 0.0759 day, or its
one-day alias 0.0820 day.  This finding has confirmed earlier detection
of superhump-like variations during the 1993 Feb. outburst through
insufficient sky conditions.  Re-analysis of the latter data gives a period
of 0.0761 (or 0.0822, less likely) day.  The present observations seem
to preclude the clamied orbital period of 0.0942 day (Munari et al. 1990,
IAUC No. 5024), which has entitled CC Cnc a rare dwarf nova in the CV
period gap.

   Follow-up observations at different longitudes are encouraged.

Regards,
Taichi Kato and Ouda team

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