[vsnet-alert 5797] V485 Cen outburst

[Taichi Kato <tkato>]

V485 Cen outburst

   The dwarf nova V485 Cen is undergoing an outburst as reported by
Rod Stubbings.  The brightness and the outburst interval suggests a
superoutburst.

  YYYYMMDD(UT)   mag  observer
  20010313.451  <144  (R. Stubbings)
  20010313.544  <148  (A. Pearce)
  20010314.485  <144  (R. Stubbings)
  20010315.460  <140  (R. Stubbings)
  20010315.817  <153  (A. Pearce)
  20010316.785  <153  (A. Pearce)
  20010317.840  <150  (A. Pearce)
  20010319.590  <144  (R. Stubbings)
  20010321.483  <144  (R. Stubbings)
  20010323.476  <144  (R. Stubbings)
  20010326.435  <142  (R. Stubbings)
  20010329.425   141  (R. Stubbings)
  20010329.435   141  (R. Stubbings)

   V485 Cen is known to be a unique dwarf nova having an orbital period
of 59 min, which is well below the "minimum period" of hydrogen-rich
cataclysmic variables.  For a reference, see Augusteijn et al. 1996,
AsAp 311, 889.

   The object is very favorably situated in the midnight sky, we encourage
long time-series photometric observations.  Previous studies have confirmed
the presence of superhumps, positive Pdot (in contrast to most SU UMa
stars), and a rebrightening which is sometimes seen in short-period
SU UMa systems.  The present outburst (of proven to be a superoutburst)
would provide a very excellent opportunity in studying this unique
variable in unprecedented detail.  The object is selected as one of the
top-priority (southern) targets for the VSNET Collaboration team.

   See also

   http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/DNe/v485cen.html

Regards,
VSNET Collaboration team

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