RTT150
Russian-Turkish 1.5-m Telescope

International astrophysical space observatory INTEGRAL

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HEAD IKI

Telescope composition and main characteristics

The telescope consists of the main tube, the equatorial mount, two guides (photo-electric and visual ones), two finders, auxiliary mechanisms and replaceable parts of the main optical systems. Guides are attached to the main tube, finders - to each of the guides.

Replaceable parts include:

secondary mirror for 1:3 and 1:7.7 schemes
secondary mirror for 1:48 scheme
corrector for 1:7.7 scheme
corrector for 1:17.3 scheme
lens focal reducer for 1:3 scheme
first diagonal mirror of Coude focus

The secondary mirror for 1:16 and 1:17.3 schemes is not replaceable and is permanently fixed inside the moving part of the focusing mechanism.

**Main characteristics of the telescope**
Distance from crossing point of the main telescope axes to the top of the telescope tube, mm	3550
Length of the telescope tube, mm	4970
Height of crossing point of the main telescope axes above the dome floor, mm	3350
Telescope weight, kg	37000
Diameter of primary mirror, mm	1500
Weight of the main mirror, kg	970
Weight of the main mirror cell, kg	2460

The main tube rotates around the telescope declination axis which is designed as follows: two semiaxes rotating in the ball-bearings are rigidly fixed to the middle part of tube. Frames of these bearings are basing with the hinges to the ends of the mount yokes. Such design allows to compensate almost completely the error in the position of telescope optical axis when yokes of the mount are in vertical plane or close to it.

The telescope is supplied with the mechanism of automatic compensation for thermal defocusing of optical systems.