Class D
From the Encyclopedia of Speculative Fiction - http://encyclopedia.wizards.pro
In the Federation standard system of planetary classification, a Class D planet is a small and rock-based body, such as an asteroid, moon or other barren, cratered planetoid with little or no atmosphere.
Regula was a Class D world, as were the satellites of a ringed planet found in the Delta Quadrant by Voyager.
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References
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Background
- The non-canon publication Star Trek: Star Charts specifies that a Class D world has an average age of 2 to 10 billion years, and includes Luna and Derna as additional bodies of this class.