Lethe

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Location
Milky Way / Hawking Eta / Thorne / Mnemosyne
Lethe
Basic Information
Type(s)
Lore
Mass Effect
In-Game
Mass Effect 2 Resources
Initial Scan Result: Rich
Element Approx. Amount Approx. Value
Palladium High 16,600
Platinum Medium 9,000
Iridium Low 4,700
Element Zero None 0
Location Information
Atmospheric
Pressure
0.58
Day Length
16.4 Earth Days
Orbital Distance
2,323,500 (from Mnemosyne)
Orbital Period
16.4 Earth Days
Radius
5,663 km
Surface Gravity
0.59 g
Surface Temp.
31 °C
Mass
0.462 Earth Masses
Featured in...
Mass Effect 2

Lethe is the largest moon of Mnemosyne, massive enough to retain its own thin atmosphere of methane and nitrogen, and heated by the brown dwarf to relatively moderate temperatures. While nearly the size of Earth, its overall density is low, suggesting a paucity of valuable heavy metals. It is tidally locked to Mnemosyne, one hemisphere always bathed in the brown dwarf's heat and dim red light.

The moon experiences constant weak tectonic activity, driven by the tidal fluxes of Mnemosyne's gravity rather than Lethe's own internal heat. Several large, ancient volcanoes release wide-ranging flows of molten silicate.