TABLE 2
         Basic parameters of the NAC and WAC systems

                       NAC           WAC
Optical design         3-mirror      2-mirror
                       off-axis      off-axis
Angular resolution     18.6          101
[microrad px-1]
Focal length [mm]      717.4         140
                                     (sag)/131
                                     (tan)
Mass [kg]              13.2          9.48
Field of view [deg]    2.20  2.22    11.35
                                     12.11
F-number               8             5.6
Spatial scale from 100 1.86          10.1
km [m px-1]
Typical filter         40            5
bandpass [nm]
Wavelength range [nm]  250 - 1000    240 - 720
Number of filters      12            14
Estimated detection    18            13
threshold [mV]