The Telescope T-170
The T-170 telescope will be a normal incidence reflective instrument
of the Ritchey-Chretien type. The mirror will have a diameter of 1.7 m and
a focal length of 17 m. The scale in the focal plane of the instrument will
be 82 mu/arcsec.
Parameters of the optical elements of T-170
- Optical system: Ritchey-Chretien
- Focal length: 17.0 m
- Primary mirror:
- diameter: 1.7 m
- curvature in axis: 9.44444 m
- eccentricity: 1.02659
- Secondary mirror:
- diameter: 0.49 m
- curvature in axis: 3.38462 m
- eccentricity: 1.91908
- Distance between mirrors: 3.5 m
- Focal plane (behind surface of primary): 0.9 m
- Field of view: 40 arcsec
- Mirror coating: Al + MgF2
- Maximum deviation of the shape of the mirror: < 35 nm
The primary mirror unit is getting ready for thermal and vacuum tests
in the facilities at the Lavochkin Association in Moscow. The testing
includes the primary mirror, the mirror support with its thermal
control system, and the heat simulators of the tube with the baffle.
The testing facility is a thermo-vacuum chamber supplied with a
nitrogen cooler for simulating the conditions of space, and a simulator
of solar radiation.
The
Scientific Payload
of T-170 will consist of a
High Resolution Double Echelle Spectrograph (HIRDES), a Rowland Spectrograph
and UV field cameras. With this equipment the telescope is intended to
obtain:
- Spectra of astronomical objects in the UV with a spectral resolution of
about 50000
- Direct imaging of astronomical objects with a resolution better than
1 arcsec
- Photometrical data in a broad spectral range including visual wavelengths
- Relative coordinates of star-like objects with an accuracy of up to
0.1 arcsec
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suv@aip.de - T. Bloecker - 25. Jan. 1996