[vsnet-alert 3917] RX Cha bright outburst

[Taichi Kato <tkato>]

RX Cha bright outburst

   Rod Stubbings reports that the suspected SU UMa-type dwarf nova RX Cha
is undergoing an outburst.

  YYYYMMDD(UT)   mag  observer
  19991219.514  <144  (R. Stubbings)
  20000101.510   144  (R. Stubbings)
  20000101.668   144  (R. Stubbings)

   The latest reported outburst of RX Cha occurred in 1998 September, during
which Gordon Garradd detected possible superhumps.  Time-resolved photometry
during the current outburst is thus encouraged.

From [vsnet-alert 2255]:

> RX Cha: possible new SU UMa star
> 
>    An analysis of time-series CCD photometry of RX Cha on Sep. 16
> (vsnet-obs 16007,
>   http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/obs16000/msg00007.html
>  vsnet-obs 16008,
>   http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/obs16000/msg00008.html)
> 
>   has yielded a 0.2-mag modulation suggesting the presence of superhumps.
> The likely period is 0.08 d.  Together with the large outburst amplitude
> (the astrometry by Garradd has confirmed that the object is below the limit
> of USNO catalog in quiescence), the present observation strongly suggests
> that RX Cha belongs to the SU UMa-type subclass of dwarf novae.
> 
> Regards,
> Taichi Kato and Gordon Garradd

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