Hatena::Groupkanatatmp

KANATA ObsLog

2011-10-19

[] Optical Transient in UGC 5460 : Ks-band Observations

f:id:kanataobslog:20111019063142p:image

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

[] Optical Transient in UGC 5460 : still rising !!

f:id:kanataobslog:20111018191614p:image

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.

2011-10-13

[] Optical Transient in UGC 5460 : still rising !

f:id:kanataobslog:20111014061648p:image

We update the light curve of the optical transient in UGC5640. This object is still brightening !

2011-10-11

[] Optical Transient in UGC 5460 : still rising

f:id:kanataobslog:20111012000755p:image

We update the light curves of the optical transient in UGC5460.

[] Type Ia SN 2011ek : update

f:id:kanataobslog:20111011224253p:image

We update the light curve of Type Ia SN 2011ek.

2011-10-10

[] Optical Transient in UGC 5460 : still rising

f:id:kanataobslog:20111010204923p:image

We update the light curves of the optical transient in UGC 5460.

2011-10-09

[] Optical Transient in UGC 2773 : update

f:id:kanataobslog:20111010003031p:image

We update the light curves of the optical transient in UGC 2773.

[] Optical Transient in UGC 5460 : brightening

f:id:kanataobslog:20111009235417p:image

We update the light curves of the optical transient in UGC 5460. The luminosity is still increasing in B, V, Rc and Ic bands.

2011-10-07

[] Optical Transient in UGC 5460 : brightening

f:id:kanataobslog:20111008041121p:image

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.