Thasus IV was the fourth planet in its star system.

Thasus IV appeared in a star chart Data and Picard studied in Stellar Cartography in 2371. (Star Trek Generations, display graphic)

See also

This planet was only mentioned in writing.
According to the FASA source book The Federation, Thasus IV was the homeworld of the Thasians (and thus synonymous with Thasus).
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