Fermion
From Halopedia, the Halo wiki
Located on the edge of the Epsilon Eridani system, the Ferimon was an outpost designed to detect incoming threats to the Reach System. It was crewed by three individuals. In 2552, The Ferimon detected a fleet of over 300 covenant vessels. It alerted Reach and was presumed destroyed soon after.
The Ferimon was also referred to as a "Remote Sensing Station," however it fulfilled the same role as the Archimedes and can be classified in the same way.
