Japetus

Japetus was the second moon of Saturn. (PROSE: Legacy)

Japetus was one of the planets which adopted the New Astrology created by Kasterborous. (PROSE: Short Trips: Zodiac)

In the 30th century, Japetus was part of the Earth Empire. (PROSE: So Vile a Sin)

In 3985, the mercenaries Lambert, Sadler, Cooper and Townsend left Japetus in stolen Federation shuttles. (PROSE: Legacy)

Behind the scenes

 * PROSE: Legacy claims that TV: The Robots of Death was set on Japetus, but all other source indicate that it is located on the planet Kaldor. As pointed out in REF: AHistory, Kaldor City is located far from Earth space and has no interstellar trade.