RU Hor rare outburst!
Rod Stubbings just reported that the dwarf nova RU Hor is undergoing an outburst (vsnet-outburst 5941). The object only infrequently undergoes outburst (2000 November, short outburst; 1999 August, long outburst?). The true quiescence is much fainter than the cataloged value (17.5p), which is most lilely from the confusion with the upper limit.
YYYYMMDD(UT) mag observer 20030425.419 <137 (Rod Stubbings) 20030426.408 <138 (Rod Stubbings) 20030504.385 <138 (Rod Stubbings) 20030827.619 <138 (Rod Stubbings) 20030830.592 <138 (Rod Stubbings) 20030927.501 132 (Rod Stubbings)Considering all the circumstances, this object is more likely a large-amplitude SU UMa-type dwarf nova, which may be undergoing a superoutburst.
We strongly encourage urgent time-resolved CCD photometry to search for superhumps. The object is suitably located for southern observers, and we wish for their contributions to this observing campaign!
Regards, Taichi Kato VSNET Collaboration team
RU Hor: definite superoutburst of a new SU UMa star!
Dear Colleagues,
The VSNET Collaboration has just received RU Hor run on Sep. 27 from Greg Bolt. The light curve already clearly shows fully developed superhumps with an amplitude of 0.25 mag. RU Hor is now established to be a genuine SU UMa-type dwarf nova. Congratulations to Rod and Greg!
We have obtained a preliminary superhump period of 0.0716(3) d. Further follow-up observations are strongly urged to refine this period.
Regards, Taichi Kato
RU Hor outburst
Rod Stubbings reports that the dwarf nova RU Hor is undergoing a relatively rare outburst. The last reported outburst occurred in 1999 August. The object has a relatively large outburst amplitude (>5 mag?), which would make it a good candidate for an SU UMa-type dwarf nova. Being at favorable location, we encourage time-resolved photometry (more than three hours long) to clarify the nature of the object. Time-series CCD observations, if applicable, should be sent to vsnet-campaign-data (not to this list).
YYYYMMDD(UT) mag observer 20000919.571 <138 (R. Stubbings) 20000920.496 <134 (R. Stubbings) 20000921.576 <140 (R. Stubbings) 20000928.499 <134 (R. Stubbings) 20000929.467 <134 (R. Stubbings) 20001003.537 <138 (R. Stubbings) 20001016.482 <134 (R. Stubbings) 20001021.476 <134 (R. Stubbings) 20001114.456 138 (R. Stubbings) 20001114.465 138 (R. Stubbings) 20001114.474 138 (R. Stubbings) Regards, Taichi Kato VSNET Collaboration team
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