| unit CCD chip | 2048X4096 pixels, three-side abuttable, 15um pixel size |
|---|---|
| back-illuminated, spectral range 0.3-1.0um | |
| No. of CCD chips | 10 chips (5 chips in 2 rows) |
| total pixel | 10kX8k pixels |
| pixel size | 15um |
| 0.20 arcsec at prime focus, 0.03 arcsec at Cassegrain focus | |
| effective area | 15cmX12cm |
| approx. 30X24 arcmin at prime focus, 5X4 arcmin at Cassegrain focus | |
| positional accuracy | 5um in x-y, 10um in z (focal depth=15um) |
| readout time | 20-40 sec in slow mode, 7-14 sec in fast mode |
| readout noise | <3e in slow mode, <7e in fast mode |
| data amount | 160MB/exposure |
| CCD op. temperature | -80 -- -90 degC |
| cooling | stirling cycle refrigerator |
| operational mode | staring mode (pointing mode) |
| filters | 10 filters can be selected |
| Johnson-Cousins' UBVRcIc and SDSS g'r'i'z' and some narrow band filter are available | |
| (Note: U band filter can be used only at Cassegrain Focus) | |
| filter exchange | needs <300 sec |
| shutter | two-blade shutter, minimum exposure 1.2 sec, resolution 0.1 sec |
| data acquisition | MESSIA-3 system |
| power consumption | approx. 500W (100W in dewar, 100W VME, 100W shutter, 200W cooler) |
| limiting magnitude | 25.2(U), 27.1(B), 26.6(V), 26.6(R), 25.7(I) |
| (point source) | for S/N=10 and 3600 sec integration |