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Originally posted by GaryN
reply to post by wildespace
I was looking at the 2012 images, which is when the last images you posted were taken.
Just found this page, which is, I think, what your nice colour images are based on:
Cassini Discovers Titan’s Glowing Atmosphere
Stars are visible, and a lot of other noise, but it is a 560 sec. exposure.
The medium and broad - band filters allow for color imaging across a wide range of targets and imaging situations. They are BL1, GRN, RED, IR1, IR2, IR3, and IR4 (common to both cameras) , UV1, UV2 and UV3 (NAC only), and VIO and IR5 (WAC only). Only the NAC has UV sensitivity due to its reflective optics, and a special Lumogen coating on the CCD, which was unavailable at the time of the Voyager and Galileo missions. The NAC takes advantag e of this new capability by splitting up its UV coverage over three filters, which together provide visibility of targets such as stratospheric aerosols, auroral phenomena, and ring and satellite materials of special interest. However, solar irradiance at Saturn is extremely low in the UV, so very long exposure times are generally necessary, especially for UV1.