The photometric camera G2-1000BI (Moravian Instruments) with E2V CCD 47-10 chip is installed in the primary focus. The focal length of the main mirror is 9 m (focal ratio f/4.5), but the correcting lens changes the effective focal length in primary focus to 7 m (focal ratio to f/3.5). The automatic exchange of the instruments between spectroscopic (fibers) and photometric (primary focus camera) configuration can be done within 1 minute. The camera is equipped with five position rotating filter wheel with different filters and cooled up electronically (down to -40° C under ambient) by Peltier cell.
Camera and chip
|ADC||Resolution||Pixel size||Read. noise||Efficiency||Linearity||Reading|
|16 bit||1056 x 1027||13 x 13 μm||9 ADU||90% (500-700 nm)||> 95 %||10 s|
Camera and telescope
|Effective focal length||Field of view||Angular resolution||Test image|
|7 000 mm||6.3′ x 6.3′||0.385 “/pixel|
The camera is equipped with five position rotating filter wheel with different filters. Complete list of available filters: Sloan u’, Sloan g’, Sloan r’, Sloan i’, Sloan z’, H-alpha, [O-III], [S-II], Bessel B, Bessel V, Bessel R, Bessel I.
Currently installed filters (see the table).
|Filter||O III||i’ (SSDS)||r’ (SSDS)||g’ (SSDS)||Hα|
Camera and telescope performance (in good seeing conditions)
brightness exposure filter measurement error Χ ~ 12.5 mag 8 s r' ~ 0.002 mag ~ 1,05 ~ 15.2 mag 8 s r' ~ 0.006 mag ~ 1,10 ~ 16.2 mag 10 s g' ~ 0.020 mag ~ 2,20 ~ 18.3 mag 20 s g' ~ 0.030 mag ~ 1,10 ~ 23.3 mag 7 h r' ~ 0.160 mag ~ 1,40