|
Our
1.56m optical telescope is located at the Sheshan Station, about 38
km from Shanghai (E 121¡ã11' 03", N 31¡ã05' 46".1). It began scie nce
observations in 1991. The station offers about 130 clear nights
annually for observation, with a seeing of typically 1".3 to 2".0.
The
reflector has a diameter of 1.56m and the focal length is 15.6m. The
field of view of the telescope is 10'50"¡Á10'50". The filters are
standard Johnson and Cousins BVRI, with a magnitude limit of 17mag
for V band and 18mag for I band. A liquid nitrogen-cooled 2048*2048
back-illuminated CCD camera is used, imported from the USA in April
2002.
CCD parameters
|
CCD Type |
SITe SI-424AB |
|
Pixel format |
2048¡Á2048 |
|
Pixel size |
24¦Ìm¡Á24¦Ìm |
|
Charge transfer efficiency |
0.99999 |
|
Full well charge |
330,000 e- |
|
Readout noise |
<10e- |
Quantum efficiency of
the 2 CCD cameras
We
started our optical monitoring of bright blazers and Seyfert 1
galaxies in 1994. More than 20,000 CCD frames of these targets have
been obtained and the data is
 now
being processing. The long-term light curves of a number of objects
have been published,
such as OJ 287, S5 0716+714 and PKS 0735+178.
Other related research fields are: blazar variability, international
AGN watches, study of the kinematics and mechanics of clusters,
variable stars in globular clusters, the short term variability of
QSOs, the astrometric study of natural satellites, determination of
the optical counterparts of radio sources, and cataclysmic
variables, amongst others.
Leading
by TAO Jun
Group members
|
