The new ROSS2 optical camera
The new optical camera, ROSS2, is a simultaneous multi-channel imaging camera delivering four different bands onto
four quadrants of the same 2kx2k CCD detector, covering from 400 to 950 nm, split by plate dichroics.
The new camera is under integration in Merate optical labs, for preliminary acceptance tests, and it will be mounted
onto REM telescope in Q1 2012.
Here some characteristics:
(*) assuming: newly coated telescope mirrors, seeing = 1 arcsec, dark current <1 e-/min, RON
<4e-, rebin = 2X, sky brightness = 21
- Wavelength coverage: 400-950 nm
- Filters: Sloan/SDSS g', r', i', z'
- Field of view: 9.1x9.1 arcmin
- Plate scale: 0.58 arcsec/pixel
- Expected limiting magnitudes (*): 19 (r'), 10 sec exposure, SNR=10
- Type: back-illuminated CCD
- Detector area: 2048 x 2048 active pixels
- Pixel size: 13.5 x 13.5 um
- Image area: 27.6 x 27.6 mm
- Dark current: 0.0004 e-/pixel/sec at -70°C
- Pixel readout: 5, 3, 1, 0.05 MHz
- Well depth: 100,000 e-
- Read noise (e-): 3 (@50 KHz), 32 (@5 MHz)
- Linearity: better than 99%
- Digitalization: 16 bit
- Minimum temperature: -80 °C under air temperature
- Cosmetics: grade 1
- Window: broadband AR coated
The response of the g', r', i', z' filters is reported below.