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Mass Effect 2 Planetary Database: Entry Details
Dranen
System: Caleston Rift
Cluster: Aysur
Anomaly/Landable: No
Installation: Base Installation
Orbital Distance: 2.5 AU
Orbital Period: 4.0 Earth Years
Radius: 72,021 km
Day Length: 17.1 Earth Hours
A sizable hydrogen-nitrogen gas giant just on the far side of its pale yellow star's "frost line," Dranen is known for its spectacular storms. At least three persistent observable "spots" -- actually cyclonic and anticyclonic storms -- have lasted for over 544 years, significantly longer than Jupiter's Great Red Spot. The largest of these spots, the Ishna, has consistently half a diameter over three times that of Earth.

Dranen has 44 moons. Two of them are of special interest to the Citadel Committee on Habitable Worlds. The first, Arvuna, is a life-bearing world that has already been colonized. The second, Alahya, is slowly being terraformed into an ammonia-based world for volus populations.