RTT150 Telescope


RTT150 (Russian Turkish Telescope) Telescope








The RTT150 (Russian and Turkish Telescope) is the biggest optical telescope in Türkiye. It is established in 1995 according to a working protocol between Türkiye and Russia. Members of the collaboration are TUBITAKKazan Federal University and Space Research Institute of the Russian Academy of Sciences. Installation of the RTT150 telescope was completed in 1998, then the first light was taken in September 2001.

The twins of the RTT150 is located at the Maidanak Observatory in Uzbekistan. RTT150 telescope has a Ritchey-Chretien optical design and there are Cassegrain and Coude focal plane modes.


RTT150 Telescope

Optical design: Ritchey-Cretien

Main Mirror diameter: 1500 mm

Focal length: 116111 mm (Cassegrain), 72257 mm (Coude)

Focal ratio: f/7.7 (Cassegrain), f/48 (Coude)

Image scale: 18”/mm (Cassgrain), 3”/mm (Coude)

Dome: Observa-DOME, 10.5 m dia.


Focal Plane Instruments


TFOSC E2V CCD (Up to Aug 8th, 2018) 

CCD Format: 2048x2048

Pixel size: 15 micron

Sensor area: 30.7 x 30.7 mm

Image Scale: 0.39 arcsec/pixel

Field of view: 13 x 13 arcmin

Filters: Bessel, SDSS, neutral

Grisms: Numbers 7, 8, 9 (echelle), 10, 11, 12, 14, 15, 17

Polarimeter: Wollaston Prism (WeDoWo)

Wavelenght region: 330-1200 nm

Spectral resolution: 200-5000


TFOSC Andor CCD (from Aug 8th, 2018)

Model: DW436 BV

Format: 2048 x 2048 pixels

Pixel size: 13.5 micron

Sensor area: 27.6 x 27.6 mm

Pixel scale: 0.33 arcsec/pixel

Field of view: 11.3 x 11.3 arcmin

Readout noise: 2.7 e- 

Dark current: 0.01  e-/pix/sec

Gain: 1.4 e e-  (16 microseconds readout)

Dynamic range: 16-bit (1 MHz)

Binning: 1x1 – 64x64

Cooling: Thermoelectric (-60 C)

Interface: CCI-010 PCI Controller Card

Filters: UBVRI, SDSS, Narrow Band


Andor iXon EM CCD

Model: DU-888E-C00-BV

Format: 1024 x 1024 pixels

Pixel size: 13.3 micron

Sensor area: 13.3x13.3 mm

Pixel scale: 0.23 arcsec/pixel

Field of view: 3.9 x 3.9 arcmin

Readout noise: 1-47 e- (10 MHz)

Dark current: 0.010  e-/pix/sec

Dynamic range: 16-bit (1 MHz), 14-bit (10, 5, 3 MHz)

Binning: 1x1 – 8x8

Frame rate: 9 fps

Cooling: Thermoelectric (-100 C)

Interface: CCI-23 PCI Controller Card

Filters: UBVRI, SDSS


Coude Andor CCD

Model: DW436 BI

Format: 2048 x 2048 pixels

Pixel size: 13.5 micron

Sensor area: 27.6 x 27.6 mm

Field of view: 4 x 4 arcmin

Spectral resolution: 40.000

Spectral covearge: 85 orders.

Magnitude limit: 8m.

Calibration: Halogen, Th-Ar lamps

Readout noise: 3.5 e- (31 MHz)

Dark current: 0.01  e-/pix/sec

Dynamic range: 16-bit (1 MHz)

Cooling: Thermoelectric (-60 C)

Interface: CCI-010 PCI Controller Card

See details at: http://www.tug.tubitak.gov.tr/rtt150_coude_sao_ras.php


Coude Iodine Cell

In order to achieve a very precise wavelenght calibration temperature controlled “I2 Cell” was attached to the Coude system in 2007 within the frame of scientific collaboration among TUG, Kazan Federal University and Okayama Astrophysical Observatory. Precise radial velocity measurements can be done with I2 cell which goes down to 10 m/sec.



There is another instrument at the Coude room called DEFPOS (Dual Etalon Fabry-Perot Optical Spectrometer). It is used to measure faint emission lines in interstellar medium. The field of view is 4x4 arcmin and it is centered at H-alpha (656,3 nm). There is 2K x 2K Andor iKon-L CCD camera at the focal plane of the instrument. 


Main Mirror Washing Archive

August 11, 2003

June 9, 2009

July 25, 2013

Reflection (mean): 57% before washing, 87% after washing
Surface Roughness (average): 227 Å before washing, 50 Å after washing

August 18, 2016

Reflection (mean): 58% before washing, 88% after washing


Last update: 02.03.2020


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