Hatena::Groupkanatatmp

KANATA ObsLog

2008-11-28

blazar AO 0235+164 : update the data

f:id:kanataobslog:20081128114358p:image

The figure shows the light curve of the object in V band and the V-J color variation. The object experienced a flare whose amplitude was about 0.9 mag. around JD = 2454790. However, the V-J color did not become blue. Thus, the flare did not have the feature of the "bluer-when-brighter" trend. The color had gradually become redder since JD = 2454733 with short-term variations.

blazar BL Lac : the light curve and the polarization degree

f:id:kanataobslog:20081128112614p:image

We continue to observe BL Lacertae, and update our result. The figure shows the light curve of the object in V band and the temporal variation of the polarization degree in same band. The object has violent variabilities and the amplitude of the polarization degree is large. In recent observations, the polarization degree reachd at about 26 % in V band.

2008-11-25

[]AO 0235+164 : update

f:id:kanataobslog:20081125224033p:image

We update the data of AO 0235+164. The object still remains in active.

[] S2 0109+224 : bright

f:id:kanataobslog:20081125114921p:image

The figure shows the light curve (red point) in V band and V-J color variation (green point). The object has been brighten since JD = 2454783 and the V-J color has been bluer. The amplitude of the magnitude in this rising was about 1.2 mag..

2008-11-20

[] PKS 0422+004 : light curve and polarization

f:id:kanataobslog:20081120190813p:image

We continue the observation of PKS 0422+004. At first, there might be anticorrelation between the light curve and the polarization degree but the polarization degree seems to correlate with the light curve from JD 2454720.

[] PKS 0048-097 : light curve and color

f:id:kanataobslog:20081120185609p:image

We report the recent data of PKS 0048-097. The figure shows the light curve in V band and the V-J color of the object. The color was blue when brighter.

2008-11-19

[] OJ 287 : update the data

f:id:kanataobslog:20081120034219p:image

The figure shows the recently behavior of OJ 287. The object has high polarization degrees which seems to take a lead the light curve.

[] AO 0235+164 : update the data

f:id:kanataobslog:20081120032905p:image

We continue the observation of AO 0235+164. The object has faded but it might become bright. The object has high polarization degrees which correlate with the light curve comparatively clear.

blazar PKS 2155-304 : the light curve and the colors

f:id:kanataobslog:20081119184244p:image

The figure shows the light curve in V band, V-J color variation and J-Ks color. The object has become faint, and the V-J color has become red, simultameously. However, the J-Ks color did not have the redder trend.

blazar BL Lac : the light curve and the V-J color

f:id:kanataobslog:20081119180633p:image

The figure shows the light curve of BL Lac in V band and the V-J color variation from 26 May to 18 Nov. 2008. The amplitude of the magnitude is about 0.8 mag.. The V-J color tends to become blue when the object is bright.

blazar 3C 454.3 : update the data

f:id:kanataobslog:20081119162821p:image

The figure shows the light curve of 3C 454.3 in V band and V-J color variation. In the light curve, the object has a variation with a small amplitude in JD = 2454785. Then, the color became blue.

2008-11-18

[] S5 0716+714 : recent behavior

f:id:kanataobslog:20081119013727p:image

We continue the observation of S5 0716+714. The figure shows the light curve and the variation of the polarization degree. The polarization degree seems to take a lead the light curve.

2008-11-17

[] 1ES 1959+650 : update data

f:id:kanataobslog:20081118002758p:image

We update the data of 1ES 1959+650 in V band. There is a time-lag between the light curve and the polarization degree.

[] 3C 371 : bright trend

f:id:kanataobslog:20081118002050p:image

We report a current light curve of 3C 371 in V, J and Ks band. The object continues brightening.

blazar S2 0109+224 : faded

f:id:kanataobslog:20081117163940p:image

The figure shows the light curve (red point) in V band and the V-J color variation (green point). The object has been faded since 4 Nov. 2008 and the amplitude of the magnitude was about 1.2 mag.. The color of the object has also been redden.

blazar 3C 66A : light curve and QU plane

f:id:kanataobslog:20081117152956p:image

f:id:kanataobslog:20081117152955p:image

The top figure shows the light curve of the object in V band, and the bottom figure shows the Q-U plane in the same band. The object has varied and the amplitude of the magnitude was about 1 mag.. The polarization vector of the object has also varied.

2008-11-14

[] PKS 1749+096 : fading

f:id:kanataobslog:20081115031514p:image

We update the data of PKS 1749+096. The object has faded away with reddening of the V-J color since 50 days ago.

[] PKS 0422+004 : correlation between mag. and polarization

f:id:kanataobslog:20081115024048p:image

We continue the observation of PKS 0422+004. The figure shows the light curve and the polarization degree of the object in V band. There might be a weak correlation between the light curve and the polarization degree.

2008-11-13

[] S2 0109+224 : polarization degree

f:id:kanataobslog:20081113222315p:image

We update the data of S2 0109+224. The figure shows the light curve and the polarization degree of the object in V band. The object has high polarization degrees. The polarization degree seems to correlate with the light curve.

2008-11-12

[] PKS 0048-097 : light curve & color

f:id:kanataobslog:20081113044648p:image

The figure shows the light curve in V band and the V-J color of the object. A flare which has a amplitude 0.6 mag. was detected. The color was blue with a flare.

[] PKS 2155-304 : brightening

f:id:kanataobslog:20081113043248p:image

We continue the observation of PKS 2155-304. The figure shows the light curve in V band and the V-J color of the object. The object has been faded but these a one week, the object has begun brightening with the variation of the V-J color. The mag. of the object in SIMBAD is V=13.09.

AO 0235+164 : fading

f:id:kanataobslog:20081112222852p:image

The figure shows the light curve of the object in V band. The object has been faded.

3C 454.3 : update the light curve

f:id:kanataobslog:20081112221308p:image

The figure shows the light curves of 3C 454.3 in V, J and Ks bands, and the points are blue, green and red, respectively. The object has been faint since 11 Oct. 2008. In addition, the object become blue.

2008-11-11

[] 1ES 0323+022 : light curve & V-J color

f:id:kanataobslog:20081112054550p:image

We have observed 1ES 0323+022 since 2008 July 25. The figure shows the light curve in V band and the V-J color of the object.

[] S5 1803+784 : light curve & polarization degree

f:id:kanataobslog:20081112025436p:image

The figure shows the light curve and polarization degree of S5 1803+784 in V band. The object has the high polarization degree.

blazar OJ 287 : light curve and color variation

f:id:kanataobslog:20081111112624p:image

We have observed OJ 287 which is one of the most famous object in blazars since 7 Oct. 2008. The figure shows the light curve of the object in V band and the V-J color variation. The amplitude of the magnitude in this object was about 0.7 mag for one week, and then the color became blue.

[] S2 0109+224 : light curve

f:id:kanataobslog:20081111060104p:image

We report the light curve of S2 0109+224 and V-J color. There maight be a weak correlation between the light curve and the V-J color. The color seems to be blue when the object was bright.

2008-11-09

blazar 3C 66A : light curve and polarization angle

f:id:kanataobslog:20081109194943p:image

f:id:kanataobslog:20081109194942p:image

The first figure shows the light curve of 3C 66A in V band and the V-J color variation. The second figure shows the temporal variation of the polarization angle in the same band. The light curve and the color variation has a feature of the "bluer-when-brighter" trend. The polarization angle has some fluctuations which occured during several days, and has been rotated gradually.

2008-11-08

[] 3C 371 :

f:id:kanataobslog:20081108225441p:image

We continue the observation of 3C 371. The object tend to be brightening.

[] 1ES 1959+650 : update data

f:id:kanataobslog:20081108212545p:image

We update the data of 1ES 1959+650. There maight be a time-lag between the light curve and the polarization degree in JD 2454740 - JD 2454780.

blazar AO 0235+164 : faded

f:id:kanataobslog:20081108203411p:image

The figure shows the light curve of the object in V band and the V-J color variation. The magnitude of the object has been faded since JD = 2454755. Although the magnitude of the object in a low state was about 19 mag in V band, the magnitude is about 16.2 mag now. Thus, the object still bright. The color shows the "bluer-when-brighter" trend.

2008-11-07

blazar 3C 454.3 : in a low state

f:id:kanataobslog:20081107160949p:image

The figure shows the light curve of the object in V band and the V-J color variation. Recently, the object has been faded. On the other hand, the V-J color has become blue. It seems to contribute a thermal component which has a peak in UV band. The thermal component is from an accretion disk which is around the central black hole.

2008-11-05

[] PKS 0422+004 : correlation between mag. and polarization degree

f:id:kanataobslog:20081106032446p:image

The figure shows a V-band light curve of the PKS 0422+004 which has the high polarization degree, and a variation of the polarization degree. There is a weak correlation between the luminosity and the polarization degree.