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Telescopes & Instruments

STELLA 1 Telescope

Both STELLA telescopes were manufactured by Halfmann Teleskoptechnik in Neusäß near Augsburg, Germany, which has been part of Halfmann Maschinenbau GmbH. They no longer build telescopes.They feature an Alt/Az mount and an aperture of 1.2m. The first telescope (STELLA-I) is an f/8 system with two Nasmyth foci and a field of view of 30'. The telescopes are equipped with a hydrostatic azimuthal bearing driven by a single stage oil pump, the altitude axis features a ball bearing. The two telescope axes are moved by direct-drive motors from ETEL with optical Heidenhain encoders. One increment on the encoder corresponds to 36", which is interpolated at a resolution of 11 bits, which translates to a theoretical pointing and tracking accuracy of the drives of 0.18''. This samples well the average site seeing of about 1''.

Wide Field STELLA Imaging Photometer (WiFSIP)

The Wide Field STELLA Imaging Photometer (WIFSIP) is a large-format CCD imager and photometer for STELLA and RoboTel.

The Wide Field STELLA Imaging Photometer (WIFSIP) is the large-format CCD imager and photometer for STELLA. It has a usable FOV of 22'x22' at a scale of 0.32"/Pixel. The detector is a single 4096x4096 back-illuminated thinned CCD (15µm pixels) and a peak QE>90% from the University of Arizona ITL. A second version is mounted on RoboTel.

Available filters are Stromgren uvbyHβ, Hα-narrow and wide (4 and 18 nm FWHM), the Sloan-u'g'r'i'z', and the Johnson-Cousins UBVRI set.

An ETC is available at the main user server.

Upgrade plans are found here.

STELLA 2 Telescope

Both STELLA telescopes were manufactured by  Halfmann Teleskoptechnik in Neusäß near Augsburg, Germany, which has been part of Halfmann Maschinenbau GmbH. They no longer build telescopes. They feature an Alt/Az mount and an aperture of 1.2m. This second telescope (STELLA-II) is equipped with a prime-focus corrector unit which feeds the optical fiber at f/8.4 with a field of view of about 2'. The telescopes are equipped with a hydrostatic azimuthal bearing driven by a single stage oil pump, the altitude axis features a ball bearing. The two telescope axes are moved by direct-drive motors from ETEL with optical Heidenhain encoders. One increment on the encoder corresponds to 36", which is interpolated at a resolution of 11 bits, which translates to a theoretical pointing and tracking accuracy of the drives of 0.18''. This samples well the average site seeing of about 1''.

STELLA échelle spectrograph (SES)

The SES is a modern white-pupil spectrograph with a moderately high spectral resolution of about 55,000 and a fixed wavelength format of 390 to 870nm. The instrument is located on a passively stabilized optical bench in an insulated box within an actively temperature-controlled room. It is fed by a 24m long octagonal optical fiber with 50µm core diameter. The spectrograph consists of a 31 lines per mm R2 echelle grating from RGL, two off-axis parabolic collimator mirrors, one folding mirror and two prisms acting as cross-disperser. The beam with a diameter of 130mm is imaged onto the detector by a f/4 refracting camera. A 4x4k E2V CCD together with a AIP-built Magellan controller is used as the detector system. The readout noise of the CCD is about 3.5 electrons rms, a CryoTiger closed cycle cooler keeps the CCD temperature at -120°C. The ETC can be found on the main user server.

Upgrade plans are found here.

Data

Filter curves etc.

Data - Read More…