BUSCA data:
Number of dichroic plates | 3 |
Detectors | 3x CCD485 Lockheed Martin, 4096 x 4096 pixels with 15mue x 15mue,
frontside devices,
1 CCD485 backside thinned (in the uv channel). |
Number of pixels | ca. 67 Mill. (4x 16.8 Mill.), ca. 16.8 Mill. total with 2x2 binning |
Field of view | 12 arcmin x 12 arcmin |
Pixel size | 0.176 arcsec (0.35arcsec with 2x2 binning, standard at typical seeing conditions) |
CCD controller | MPIA design, 4 channels maximum |
CCD read out | four color channels simultaneously |
Read out time | ca. 2:20min with 2x2 binning |
Shutter: Type | "Bonn Shutter", two blade, stepper motor driven |
Shutter: Min. exposure time | < 10ms |
Shutter: Photometric performance | Exposure homogeneity >99% at 100ms exposure time |
Guider FOV | 5.6 arcmin x 4.2 arcmin |
Guider field position | fixed, 8 arcmin north of camera field center |
Data storage/format | one FITS file for each of the four CCD frames |
Channel data:
channel | a | b | c | d |
wavelength | < 430 nm | 430nm - 540nm | 540nm - 730nm | > 730nm |
CCD | 4k x 4k (thinned) | 4k x 4k | 4k x 4k | 4k x 4k |
gain [ADU/e-] | 3.13585 | 3.03402 | 2.96736 | 2.93033 |
fullwell [e-] | 131500 | 121000 | 155000 | 128500 |
read out noise [e-] | 9.58 | 6.37 | 7.60 | 8.38 |
filter pos 1 | WG 280 | WG 280 | WG 280 | WG 280 |
filter pos 2 | Strömgren v | H beta (narrow) | free | free |
filter pos 3 | Strömgren u | Strömgren b | Strömgren y | free |
filter pos 4 | free | H beta (wide) | free | Cousins I |
The values for the gain and readoutnoise are measured with the CDS-Gain of 20. To get the rela values for channel b which has normally the CDS-Gain of 50 you have to multiply the values with 2.5.