This group is used for showing preliminary result and report from the KANATA telescope team.

cataclysmic variables

Cataclysmic variables (CVs) are semi-detached binary systems containing a white dwarf and a Roche-lobe filling secondary star. The gas from the secondary forms an accretion disk around the white dwarf in the case that the magnetic field of the whi...

intermediate polar

Intermediate polars (IPs) are a subclass of magnetic cataclysmic variables. Both the orbital period of the binary system and the spin period of the white dwarf are observable in IPs. An accretion disk in the IP is considered to be truncated becau...

early superhumps

Early superhumps (, or sometimes "early humps") are short-term periodic variations observed in WZ Sge-type dwarf novae during superoutbursts. While ordinary superhumps have a period slightly ( a few percent ) longer than the orbital period, the pe...


Superhumps are a short-term periodic variations observed during superoutbursts in SU UMa-type dwarf novae. They have a period slightly ( a few percent ) longer than the orbital period of the binary system.


Superoutbursts are a kind of dwarf nova outbursts observed in SU UMa-type dwarf novae. Superoutbursts are characterized by a higher amplitude (3--6 mag) and a longer duration (~10 d) of outbursts than normal outbursts.

WZ Sge-type superoutburst

WZ Sge-type superoutbursts are a kind of superoutbursts observed in SU UMa-type dwarf novae. WZ Sge-type superoutbursts are characterized by i) early superhumps appear during the first few days of the superoutburst, ii) ordinary superhumps appear ...

dwarf nova

Dwarf novae are a subclass of cataclysmic variables. Outbursts of dwarf novae are characterized by an amplitude of 2--8 mag, a recurrence time of a few days--10 yr, and optical spectra, in general, showing absorption lines, originated from an opt...

PKS 1510-089

The object is one of the most famous blazar. The object seems to have a radiation of a thermal component at UV range (Singh et al. 1997). RA = 15:12:50.53 Dec =-09:05:59.8 simbad PKS1510-089 light curve

3C 454.3

3C 454.3 is the brightest blazar in the gamma-ray regime. This object has violent variabilities and large amplitudes of the polarization degree. This had a historical outburst in 2005 in optical region. RA = 22 53 57.748 Dec = +16 08 53.56 ...

3C 273

This object is Low Polarized Quasar(LPQ) which has a low polarization degree. 3C 273 Optical light curve