Argos IV is a star system in Federation space.

Argos IV was a major scientific institute during the 23rd century, headed by exobiologist expert Dr. Zeas Wuqq. (TOS video game: 25th Anniversary)

The ship's computer in the game refers to Argos IV as a star system but the numerical designation and its definition as an institute makes it seem to be the fourth planet of an "Argos system".
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