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Krelln is the largest of the two Arrakian satellites. Krelln has nearly the same face toward Arrakis.
The moon has been of limited commercial use except of titanite mining operations. It has also functioned as an observational facility for deep space surveillance.
It is composed of titanium-rich silicates in the crust and mantel. The silicate mantel extends to a depth of 170 km. There is no apparent differentiation in composition which implies scant reheating following its formation. Seismiic studies established small, rocky core.
Krelln has no atmosphere, and the landscape is stark. The only erosion occurs due to thermal stress and particle impact. A layer of meteoritic dust covers the surface of Krelln to a depth of 11 cm. Large numbers of craters dot the surface whose diameters range from 40 km to small pit-like features less than 1 mm in diameter.
- Mean radius: 488 km
- Orbit distance: 324,077 km.
- Density: 3.97 g/cm3
- Orbit: every 25.5 days
- Angular diameter: 10.36 arc minutes
- (total eclipses of Canopus do not occur)
- Libration: 16° once each orbit
- ARRAKIS, Astronomical aspects of