Class D planet, Emanations

A ringed class D planet

"Essentially a great rock in space."

In the Federation standard system of planetary classification, a class D planet was characterized as a small, rock-based body, such as an asteroid, moon or other barren, cratered planetoid with little or no atmosphere.

The planet known as Weytahn to the Andorians and Paan Mokar to Vulcans was an example of a class D world. Weytahn was class D before terraforming. It was described as being not much larger than Earth's moon. (ENT: "Cease Fire")

Regula, which in 2285 was described as a "great rock in space" with a few "unremarkable ores," was also a class D planet. (Star Trek II: The Wrath of Khan)

In 2371, the USS Voyager found a ringed planet in the Delta Quadrant which was also class D. Some of the asteroids comprising the rings were big enough to have class M environments inside them. (VOY: "Emanations")

A subspace sinkhole encountered by the Voyager in 2375 led to a subspace pocket, where a star system composed of a G-type star and three planets was located. One of these planets was class D. It was described as hot, arid, and rocky, but otherwise had an atmosphere breathable by humanoids, e.g., Humans and Vulcans. It also supported limited indigenous plants and a species of spiders. (VOY: "Gravity")

According to Star Trek: Star Charts, on page 23, a Class D world had an average age of two to ten billion years, had a diameter of 100 to 1,000 kilometers, could be found in every zone of a star system, could be found in greater numbers around larger planets or in asteroid belts, had a barren and cratered surface, and had little to no atmosphere. An example given of a Class D world was Luna.

List of class D worlds

Image Name Location Notes
Regula Regula Mutara sector, near the Mutara Nebula
Noss' ship crashed Unnamed subspace sinkhole planet Orbiting a G-type star, inside a subspace sinkhole in the Delta Quadrant Unusually hospitable for a class D world; destroyed when the sinkhole was collapsed by Yost in 2375
Class D planet, Emanations Unnamed planet in the Delta Quadrant Delta Quadrant Asteroids in the ring system connected to Vhnori homeworld by subspace vacuoles
Weytahn Weytahn/Paan Mokar Andorian-Vulcan border, Alpha Quadrant Terraformed by the Andorian Empire in the 2050s

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