Universe Mass Effect Universe
Cluster Armstrong Nebula
System Grissom System
Class Gas Giant
Atmosphere Hydrogen, Helium, Ammonia & Nitrogen
Orbital Period 990.5 Earth Years
Radius 73,314 km
Day Length 16.9 Earth Hours
Notable Species Planktonic ammonia-based lifeforms

Notanban is a hydrogen-helium gas giant with traces of ammonia. Molecular nitrogen is present in the highest levels of the atmosphere, giving the Planet its odd violet tint.

The upper levels of Notanban's atmosphere are inhabited by "shoals" of tiny ammonia-based lifeforms, no larger or more complex than the plankton of Earth's oceans. Held aloft by air pressure and wind, these bioluminescent creatures constantly flee from the approach of the terminator. Should they be exposed to the light and heat of Grissom, they die.

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