As Türkiye's largest investment in fundamental science, forming the space sciences ecosystem, we are an advanced research infrastructure founded in partnership between Atatürk University and TÜBİTAK.
The DAG400 telescope located at the Erzurum DAG Campus enables scientific work at the international level thanks to the active optics and adaptive optics technologies used.
General Specifications
Mount Type
Mirror Diameter (m)
f Ratio
Focal Length (m)
Optical Design
FoV Field of View
Observation λ**
Alt.-Az.
4.0
14.2
56.0
Ritchey Chrétien
24.0' x 24.0' (Seeing Limited) 7.0' x 7.0' (Diffraction Limited)'
VIS+ NIR
**NIR: Near InfraRed**λ: Observation wavelengths VIS: Visible Region
Focal Plane Instruments
The DAG400 telescope is a telescope with an alt-az mount, and since the stars move on the equatorial plane, KORAY, which has a K-mirror structure, will be used as the field rotator.
Parameter
Value
Maximum rotation speed
5 ⁰/s
Maximum angle range
± 170⁰
Angular precision
± 0.1⁰
Displacement relative to optical axis
250 µm
Motor field-of-view radius (Rfov)
3.5′
It is a camera designed for imaging in the infrared region on a diffraction-limited platform. It receives its input from the adaptive optics module or the coronagraph. With its infrared imager equipped with adaptive optics, it has a wide range of scientific research to be conducted in near-infrared imaging requiring high-resolution characterization.
Parameter
Value
Detector
Teledyne H1RG
Detector size
1016 x 1016 px with 18 µm px size
Wavelength range
0.9 – 2.4 µm (NIR)
Plate scale
33 mas/pixel
Field of view
33″x33″
Readout noise
18 e-
Dark current
< 0.1 e-/pixel/second
Gain
1.8 e-/ADU
Filter wheel
Ø24 x 5 mm, 2x6 slots
Filters
Y, J, H, K
Filter position
Filter
λmin
λmax
λc
Δλ
Filter wheel #1
#1
Y band
900
1140
1020
240
#2
J band
1113
1327
1220
214
#3
H band
1476
1784
1630
308
#4
K band
1995
2385
2190
390
#5
Customer filter #1
#6
Customer filter #2
Filter wheel #2
#7
Y cont
1020
100
#8
J cont
1070
5
#9
H cont
1570
20
#10
K cont
2270
40
#11
Dark
#12
Pupil viewer lens
Adaptive optics is a technology that corrects distortions in optical systems. In ground-based observations, it is used to compensate for the rapidly changing image distortions caused by atmospheric turbulence.
It is an optical simulator that produces calibration images for all focal plane instruments, provides sources at many wavelengths and many fields of view for system continuity and alignment tests, and also provides testing to develop new optical systems to be applied to the DAG400 telescope. It will be integrated into the system to operate behind the adaptive optics and coronagraph.
The Programmable Liquid-Crystal Active Coronagraphic Imager for the DAG400 is an "adaptive star coronagraph"; with its "adaptive" feature it holds an important place not only in our country but also at the international level. It provides high-contrast imaging. It has a system that can switch the optical path between focal plane instruments.
