Iapetus
Iapetus
Moon
Pisces
Visible
Level 6
Professional/Research - Timing dependent
Properties
Magnitude
10.2
Angular Size
0.2 arcmin
Distance
3561028 ly
Type: Moon
Distance: 0.024 AU
Orbital Period: 79.3 days
Diameter: 1,469 km
Features: Dark Cassini Regio, bright Roncevaux Terra, equatorial ridge
Dramatic two-toned surface: bright trailing hemisphere (mag 10.2) and dark leading hemisphere (mag 11.9). Cassini noticed it was visible only on one side of Saturn. Far from Saturn, so easier to separate. Requires 6 inch telescope.
Position & Identifiers
RA
00h 18m 41.8s
Dec
-00° 19' 10.5"
Constellation
Pisces
Catalog
Iapetus
Visibility
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Survey Image
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Community Photos (1)
Credit: NASA / JPL / SSI / Gordan Ugarkovic. License: CC BY-SA 2.5. (Wikimedia Commons)
Skybred Feb 28, 2026