The telescope (T-170M) is composed by the optical system, a structural module and a service complex. The primary mirror unit (PMU) is the main structural element of the telescope.
There are three attachment points between the telescope and the spacecraft service module in the bottom frame part. The optical bench with the scientific instrumentation devices, and the primary mirror baffle are mounted on the PMU frame. The secondary mirror unit (SMU), the light protective cover with the deployment mechanism, and the rotary external baffle with its fixing unit are located in the top part of telescope tube. The external rotary baffle has an oblique cut for light exposures prevention of the telescope internal cavity. It can be put in two positions: transport and operational. The translation of the external baffle from the transport position to the operational one is carried out after spacecraft insertion onto the low Earth orbit (LEO) by turning it by 180 deg. The turning is performed by the actuators located on the top frame parts of the telescope. The T-170M telescope is based on the classic Ritchey-Chretien scheme.
|3.||Primary Mirror Unit basic frame|
|4.||Radiator with heating elements|
|6.||Secondary Mirror Unit|
|8.||Telescope Light Protective Cover|
|9.||Primary Mirror Baffle|
|10.||Secondary Mirror Baffle|
|13.||Focal Camera Unit|
|15.||External Electronic box|
|16.||Scientific instruments protective cover|
|Aperture diameter||1.7 m |
|Focal length||17 m (primary mirror)|
|Field of View (FoV)||30 arcmin (150 mm in diameter)|
|Wavelength range||102-320 nm|
|Primary Wavelength||200 nm|
|Optical quality||Diffraction limited at FoV center|
|Angular resolution on focal plane||12.13 arcsec/mm|
|Mass||1570 kg (1600 kg with adapter truss)|
|Size||5.67 x 2.30 m (transport)8.43 x 2.3 m (operational)|
The telescope is under development by Lavochkin Association (Russia). Optical elements are being manufactured by the Lytkarino Optical Glass Factory (Russia). Space qualification is under resposibility of the Institute of Astronomy RAS (Russia). The primary mirror and other optical elements are being manufactured by the Lytkarino Optical Glass Factory.
In the images below the process of installation of the mirror is shown in the container for trasportation. The primary mirror of T170M telescope was moved from Lytkarino Optical Plant to SIA "LUCH" for applying of the coating.