Investigating Subtle Colors on Iapetus
Cassini stared toward Saturn's two-toned moon Iapetus (914 miles or 1,471
kilometers across) for about a week in early 2015, in a campaign motivated in
part to investigate subtle color differences within the moon's bright
terrain.
This distant flyby represents Cassini's second-closest approach to Iapetus in
the current mission phase; a slightly closer encounter took place in 2011. It is
the only set of observations with a good view of the bright terrain in the
moon's north polar area.
The large basin at lower right, within the dark terrain, is named Turgis. The
slightly smaller crater at the nine o'clock position is Falsaron. The two
prominent craters just above image center are Roland and Turpin. At the limb
around the three o'clock position is the darkened rim of the crater Naimon.
Images taken using red, green and blue spectral filters were combined to
create this natural-color view. The moon's brightness has been enhanced in order
to make the dark terrain visible. The image also was enlarged by a factor of two
compared to the original data.
The view was obtained by the Cassini spacecraft narrow-angle camera on March
27, 2015 at a distance of approximately 621,000 miles (1 million kilometers)
from Iapetus and at a Sun-Iapetus-spacecraft, or phase, angle of 38 degrees.
Image scale on Iapetus is about 4 miles (6 kilometers).
The image was produced by Tilmann Denk at Freie Universität in Berlin.
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