We update the light curve of nova Sgr 2011. The light curves show the rebrightening in the V, J, H and Ks bands. This indicates that the decline and rebrightening could not be caused by the dust formation.
We update the data of OJ 287. The object showed a violent variability. The amplitude of the magnitude since JD 2455000 was about 2 mag. The figure shows the light curve in the V band and the V-J color variation.
We have performed the spectroscopic observations of Type Ia SN 2011B since Jan 8. This object is classified into normal Type Ia SNe. We find the high-velocity features of CaII IR triplet absorptions at Jan. 8, which is 13.5 days before B-band maximum. On the other hand, the SiII6355 absorption line is much lower velocity than that of CaII. This results indicate that the CaII regions is much detached from the photosphere. The presence of high-velocity regions might come from rather delayed detonations than deflagration. We will continue the observations of SN 2011B.
We started the observations of nova Sgr 2011. This object is heavily reddened by interstellar dust. The raw V-J is 3.0, which is very red comparing with a typical value of classical nova in its peak. The V-band light curve shows the fast decline, which indicates that this nova would be classified into very fast nova, or still undergo in transitional phase. We continue the observations.
■ [blazar] S5 0716+714 : Update the data
We update the data of S5 0716+714. The figure shows the light curve in the V band and V-J color behavior of the object. The object has recently been faded.
We update the light curve of the optical transient in UGC 2773. The light curves show the start of the decline with a few tenth fluctuation. The difference of the magnitudes at maximum and last day is 1.0 mag. On the other hand, the variations of color index are lower than 0.5.
We update the light curve of Type Ia SN 2011B. We added the J-band light curve to BVRI ones. We can accurately estimate the host galactic extinction using the J-band magnitude. The J-band light curve shows the faster decline than those of other band. This behavior is also seen in a typical SN Ia. We will continue the observations of SN 2011B.