[] M31 2010-09b : Observations Start


We performed the photometric observations of M31 2010-09b using 1.5m-Kanata telescope equipped with HOWPol. This nova was discovered of 17.3 mag in the nearby galaxy M31 on 2010 Sep. 30.566 by the amatuer nova survey persons, Nishiyama and Kabashima (CBET 2472). Despite of the early discovery of this nova (ATEL 2896), our preliminary results indicate that the brightness rapidly decrease with time. This results suggest that M31 2010-09b may be a class of very fast novae (Payne-Gaposchkin 1958). But, the object is not so moreluminous than M31 2009-10b (CBET 1971, Kanata ObsLog on 2009 Oct. 19). This means that this nova may be reddened by the galactic dust or a possible candidate of the recurrent nova, like U Sco. Shafter et al. reported that the spectrum exhibits the HeII 4686 line and the FeII line series on Oct. 1.39, which indicates that this nova is a possible hybrid nova (ATEL 2898). This class object will be rapidly fading out. We will observe this object until limit.