Variable Stars - GR Ori
Type WZ Sagittae type subclass of UGSU dwarf novae WZ Sagittae type subclass of UGSU dwarf novae in which the interval between super-outbursts is unusually long (that is due to a very low mass- transfer rate), measured in decades, while normal outbursts are few and far between. They show re- brightenings. Orbital periods range from 0.05 to 0.08 d. AAVSO Alert 343: February 11, 2013  Observer Rod Stubbings (Tetoora Road, Vic., Australia) reports an outburst of the suspected old nova GR Ori (== Nova Ori 1916), observing the star at a visual magnitude of 13.0 on 2013 February 11.476 UT (JD 2456334.976).  This observation was confirmed by observer Stephen Hovell (Kaitaia, New Zealand), who also reported the star at 13.0 on February 11.461. Mike Simonsen (Michigan, United States) notes that the suspected progenitor of this star has a magnitude around 22.8 in the Sloan Digital Sky Survey, suggesting a large outburst amplitude of 8-10 magnitudes, and that the star may be a WZ Sge-type dwarf nova rather than a classical or recurrent nova. The overwhelming majority of observations of this star are fainter-than estimates, and the outbursting behavior is poorly measured.  However, there have been instances of this object appearing bright over the past decade.
Hills Observatory: 1 January 2013 to 6 May 2018