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Mass Effect 2 Planetary Database: Entry Details
Caleston
System: Caleston Rift
Cluster: Balor
Anomaly/Landable: No
Installation: Base Installation
Colony Founded: 1975 CE
Capital: Syneu
Population: 1,802,705,000
Orbital Distance: 0.07 AU (orbits Cernunnos)
Orbital Period: 21.5 Earth Hours (around Cernunnos)
Radius: 6,600 km
Day Length: 21.5 Earth Hours
Atmospheric Pressure: 0.9 Earth Atmospheres
Surface Temperature: 30 Celsius
Surface Gravity: 1.2 G
The hostile moon Caleston is the largest satellite of the gas giant Cernunnos. An ancient asteroid strike deposited major lodes of element zero within the molten sulfur mantle. Eldfell-Ashland Energy's mining operations have made it the largest source of starship drive core material in the Attican Traverse.

Caleston is wracked with volcanism due to tidal stresses from Cernunnos. Because of weak solar output, plant-like life on Caleston is not carbon-based and photosynthetic but silicon-based and thermosynethic, requiring heat rather than sunlight to power its chemical reactions. These organisms flourish in volcanic vents and during solar flares, when Balor can double or triple in luminosity. Sadly, sapient habitation is not possible here, and Caleston's biodiversity is considered "threatened" by the Citadel Council on Habitable Worlds.