Centauri VII

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Centauri Seven

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You may be looking for Costa del Centauri VI.

Centauri VII or Centauri Seven, (PROSE: Time and the Rani) pronounced "Sen-Tur-I Seven" by the Seventh Doctor, was a planet presumably in orbit of Alpha or Proxima Centauri.

Regaining consciousness in the Rani's laboratory on Lakertya, the Seventh Doctor mentioned several things he needed to do, including that he "must just pop over" to Centauri Seven, and then perhaps a quick holiday. (TV: Time and the Rani)