Earth Outpost Station

The Earth Outpost Stations (sometimes referred to as the Earth Outposts or the Earth Outpost Monitoring Stations) were facilities that monitored the Romulan Neutral Zone.

Deployed in Sector Z-6, these were constructed on asteroids after the end of the Earth-Romulan War. They were a mile (1.5 km) beneath the surface of each asteroid in cast rodinium domes. They were crewed by 16 personnel each and were outfitted with the latest sensor and communications equipment of the time. (Star Trek Data File, Vol. 1)


 * Presumably, these received technological upgrades over the century between initial construction and the renewed outbreak of hostilities in 2266.

By the 2250s, these stations were supplemented by Watchtower stations. (' comic ')

In 2266, four of these facilities -- Outposts 2, 3, 4 and 8 -- were destroyed by a lone Romulan bird-of-prey testing Federation sensor technology and military strength. 

The four stations destroyed were replaced. 20 years later, Earth Outpost 4 would be the site of a standoff involving Romulan forces vs. the Federation starships Konkordium and Avenger. (: "By Honor Bound")