2011-10-19
■ [LBV or SN ?] Optical Transient in UGC 5460 : Ks-band Observations
We performed Ks-band photometric observations on Oct. 18 using new optical and near-infrared camera "HONIR (Hiroshima Optical and Near-Infrared Camera)" in its tentative observations. The preliminary magnitude was estimated to be 13.9 +/- 0.1 mag. This indicates that the near-infrared excess does not strongly occur in the ejected material. We will observations in optical and near-infrared wavelengths.
2011-10-18
■ [LBV] Optical Transient in UGC 5460 : still rising !!
We update the light curves of the optical transient in UGC 5460. The apparent brightness reached around 15 mag in Rc-band filter. This indicates that the absolute magnitude of this ibject reached -16 mag. This value is luminous than that of Eta Carina in the most luminous phase.
2011-10-07
■ [LBV] Optical Transient in UGC 5460 : brightening
We started photometric observations of the optical transient in UGC 5460. This optical transient was spectroscopically classified as an eruption from luminous blue variable (LBV). The light curves indicate the brightening in V, Rc and Ic-band. If the nature of this transient is an eta Car-like object, the light curves may keep the luminous state for more than a year. We will continue the photometric observations of this object.
