Physical Characteristics
Its diameter is estimated at 72 km (assuming albedo of 0.04) making it the second largest irregular satellite of Uranus, half the size of Sycorax, the biggest irregular satellite of Uranus.
Somewhat inconsistent reports put Caliban in light-red category (B–V = 0.83 V–R = 0.52, B–V = 0.84 ± 0.03 V–R = 0.57 ± 0.03), redder than Himalia but still less red than most Kuiper belt objects. Caliban may be slightly redder than Sycorax. It also absorbs light at 0.7 μm, and one group of astronomers think this may be a result of liquid water that modified the surface.
The light curve suggests the rotation period of Caliban is about 2.7h.
Read more about this topic: Caliban (moon)
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