■ [Extragalactic nova] M31 2011-01a : observation start
We started observations of extragalactic nova M31 2011-01a since Jan. 9. We roughly measured the apparent peak magnitude of 15.3 mag in V-band. This indicates that this nova is one of the very bright nova. It roughly takes 10 days to decrease by 2 magnitudes. Thus, this nova is classified into very fast nova. This very fast decline is consistent with high peak luminosity. We will continue the observations of this nova.
We started observations of Type Ia supernova (SN) 2011B since Jan. 9. This object was discovered in nearby galaxy NGC 2655 (m-M=31.45; NED extragalactic database) on Jan. 7 by K. Itagaki and M. Tsuboi, independently. We find that this object is still rising its luminosity in spite of times elapse 16 days after discovery! This means that this SN would be one of the ealiest discovered SNe Ia. We will continue the observations of this SN.
We update the data of 3C 66A. The figure shows the light curve in the V band and V-J color variation of the object. The object have been gradually brightened superimposed the short timescale flares which typical timescale is several days since JD 2454810. Although there is the short timescale variation, the V-J color was around 1.7.
We have started the photometric observations of Type IIn SN 2010jl since Nov. 5. This SN was discovered of 13.5 mag at UGC 5189A on Nov. 2. by Jack Newton and Tim Puckett. The spectroscopic observations were performed and it is classified into Type IIn SN. We will perform the photometric observation of this SN.