Dytallix B

From Memory Alpha, the free Star Trek reference.

Dytallix B is the fifth planet of the Mira Antliae system, one of seven uninhabited planets once mined for the Federation by the Dytallix Mining Company. The planet is tidally locked, with temperatures reaching 180 °C on the day side. The mines were located in the temperate zones between the day and night hemispheres.

By 2364 the mines were long abandoned, and were used a secret meeting place by Captains Jean-Luc Picard, Rixx, Tryla Scott, and Walker Keel to discuss the infiltration of Starfleet by neural parasites. (TNG: "Conspiracy")