Almost complete dome (31Kb)
At Nishimura works (35Kb)
Telescope in dome (60Kb)
Telescope from above (50Kb)
Purpose
The Infrared Survey Facility consists of a dedicated telescope and
simultaneous three-channel imager called SIRIUS for
specialized surveys
of the southern hemisphere sky in the infrared J(1.25 micron), H(1.65
micron) and
K'(2.15 micron) bands. It is a joint Japanese/South
African project.
Telescope
The telescope for the Facility is a 1.4m F10 altazimuth Cassegrain
instrument constructed by the Nishimura
Telescope Company in Kyoto, Japan. Installation of telescope and camera
at Sutherland took place September-November 2000.
The optics were made by LOMO, St Petersburg, from Astro-Sitall glass ceramic.
Parabolic primary paraxial radius = 8122mm; 1/6.5 wave at 0.63 microns; usable diam = 1395mm
Hyperbolic secondary conjugates = 1401mm, 3640mm; diam = 400mm
Mirror separation = 2985mm
Focal plane 200mm below mounting flange
System focal length = 13800mm
|
Almost complete dome (31Kb) |
At Nishimura works (35Kb) |
Telescope in dome (60Kb) |
Telescope from above (50Kb) |
Imager
The Sirius (Simultaneous-3color InfraRed Imager for Unbiased
Survey) imager is a simultaneous 3-channel JHK'
device using three 1024 x 1024 HgCdTe arrays. It was constructed at
Nagoya University. It has an Offner relay
imaging system with cold pupil stop. It is cooled by a closed-cycle
refrigerator. The field is approximately 7.8' x 7.8'.
Sirius
home page
International Agreement
The construction and operation of the facility is covered by an
agreement, dated August 3, 1998, between the
South African Astronomical Astronomical Observatory and the Graduate School of Science and
School of Science,
Nagoya University.
The division of time on the instrument is: