Ross 154

Ross 154 is a red dwarf star with a contingent of five planets, very close to Sol. It is a young star, less than a gigayear old, and as such is a highly active flare star (in the same class as UV Ceti), with an interflare period averaging about 48 hours. This also explains why Leto's biosphere is so simple; in fact, the Letosian organisms offer astrobiologists a valuable window into the process of abiogenesis.



Ross 154 lies just under ten lightyears from Sol, in the constellation of Sagittarius, making it quite close to the center of known space.


Ross 154

  • Momus (s)
  • Perses (i)
  • LetoΔ (n) [research station - UNSS Delos]
  • Lelantos (n)
  • Antiphates (i)

For more information, visit the Wikipedia page on Ross 154.

Fauna & Flora

The planet Leto hosts a unicellular nitrogen-based biosphere, composed entirely of a web of aeroplankton. These are known as Letogenids.

Included Locations
Universal Star Catalogue designation USC 006
Location Local Interstellar Cloud, Local Bubble, Orion–Cygnus Arm, Milky Way, Virgo Supercluster
Proximal system Barnard's Star (5.5 ly)

System Structure

System diameter (farthest orbit) 6.43e+8 km (Antiphates)
System diameter (helioshock) 9.12e+13 km
System mass 0.20 MSol

Endemic Bodies

Central star Ross 154
Stellar type M3.5V
Known planets 5
Known dwarf planets 9
Biotic bodies 1

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