Main Cassegrain telescope of the observatory of Astronomical
Institute of the Slovak Academy of Sciences in Stara Lesna with
60 cm (approx. 24 inches) diameter primary mirror has
7.5 m (approx.
25 feet) focal length. There are also
finder telescope (10 cm diameter
refractor with 1 m focal length) and
auxiliary telescope (Cassegrain reflector with 15 cm diameter and 2.25 m focal length) on the same mount. The auxiliary
telescope works as guider when photoelectric photometer is used for
observations. The whole setup is placed in the dome with 5 m diameter.
AV SAV observatory dome in Stara Lesna (left), 60 cm Cassegrain telescope (right)
There is a G4-9000 CCD camera on the telescope and also a small
guiding camera G0-2000 on the off-axis guider. Current filter wheel is
equipped with round 50 mm filters, which
cover corners of the G4 camera large detector. This is why it will be
replaced with the EFW4-5 filter wheel, integrated with the camera, for
square NBVRI filters of 50 × 50 mm dimensions.
Cassegrain telescope with G4 and G0 cameras in the
Observations performed with 60 cm
telescope and CCD camera are focused to extrasolar planet transits and
research of young open clusters (YETI campaigh). Part of the
observing time is devoted to measurement of exact timing of low-mass
binary stars minima as a part of the Dwarf campaign. This
research uses minima timing for detection of extrasolar planets in
All images on this page courtesy of Theo Pribulla, AI SAV.