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The CCD Camera - Observatory Kryoneri |
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The main scientific instrument of the 1.2m Telescope is the CCD Camera,
a Series 200 Camera System made by Photometrics
(now Roper Scientific).
| CCD Camera Features |
| CCD type |
SI-502, Grade 1, UV-coated
516 x 516 pixels |
| pixel size |
24µ x 24µ |
| cooling |
up to -40°C
Peltier system
(water-circulation) |
| gain |
5.17 e-/ADU (1x gain)
1.23 e-/ADU (4x gain) |
| readout noise |
9.0 e- RMS (1x gain)
7.5 e- RMS (4x gain)
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| dark current |
1.03 e-/pix/s |
In the Cassegrain focus of the telescope, the field size of the CCD is about
2.5 x 2.5 arcmin with pixel size of 0.30 arcsec.
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A part of the quantum efficiency curve of the chip
| nm |
300 |
320 |
340 |
360 |
380 |
400 |
450 |
500 |
550 |
600 |
650 |
| QE |
0.19 |
0.25 |
0.29 |
0.35 |
0.40 |
0.41 |
0.46 |
0.64 |
0.64 |
0.65 |
0.64 |
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A set of 5 Bessel filters is provided (U,B,V,R,I). It is mounted on a
computer-controlled
filter wheel.
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Four of the Bessel filters provided (B,V,R,I).
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The camera and the filter wheel are controlled by a dedicated PC (Windows).
A PMIS control program (GKR Computer Consulting)
is used for the CCD, while the filter is controlled by simple commands parsed to a serial port. Automated sequence of observations can be programmed using a simple script language. A GPS
system (PCI-card) provides accurate time.
Another PC (Windows and Linux) is used for images storage, processing, and analysis . Both PCs are time-synchronized. The computers are connected to a Local Area Network.
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| A combined image of the Ring Nebula (M57) in Lyra (r, v and b CCD frames, size 151x151 pixels) |
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A combined image of the Cat's Eye Nebula NGC6543
(r, v, and b CCD-frames, size 151x151 pixels) |
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A combined image of the globular cluster M3
(r, v, and b CCD-frames, size 256x256 pixels) |
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