Dytallix B, also known as Dytallix B planet or Mira Antlia V, was the uninhabited fifth planet of the Mira Antlia system. The planet was tidally locked, with temperatures reaching 180 °C on the day side, and had no indigenous lifeforms.
Some time before 2364, the planet was actively mined for the United Federation of Planets by the Dytallix Mining Company. The mines were located in the temperate zones between the day and night hemispheres. The mines had been long abandoned by 2364.
In 2328, Dytallix B was the point of embarkation for three individuals. Mark Stimson traveled to Epsilon Wiltz IV on the SS Manoa, Max Gabl traveled to Alpha Majoris I on the SS Kogin, and Craig Galloway traveled to Alpha Majoris I on the SS Wisconsin. (TNG-R: "Inheritance", Okudagram)
In 2364, the position and orbital path of the planet was depicted on a system map that was displayed on the bridge of the USS Enterprise-D. (TNG: "Conspiracy", Okudagram) The planet was used as a secret meeting place by Starfleet Captains Walker Keel, Rixx, Tryla Scott, and Jean-Luc Picard to discuss the infiltration of Starfleet Command by parasitic beings. (TNG: "Conspiracy")