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Memory Alpha

The Coalsack Nebula, also known as C99, was a Class J nebula that was located in the Beta Quadrant.

HIstory[]

In 2268, when Spock speculated about the nature of the yet unidentified space amoeba encountered in Sector 39J, he remarked the amoeba was not like the Coalsack. (TOS: "The Immunity Syndrome")

In 2269, the USS Enterprise was commandeered by Bele of the planet Cheron, who attempted to divert the Enterprise on course 403-mark-7 from their position near Ariannus. Chekov remarked that the course would have taken them straight to the Coalsack. (TOS: "Let That Be Your Last Battlefield")

Stellar cartography[]

The Coalsack Nebula was visible from Earth in the constellation Crux. This nebula was approximately 600 light years from Sol, in the southernmost part of the Milky Way Galaxy.

The planet Cheron was in the vicinity of the Coalsack Nebula. By the late 2260s, the region surrounding the nebula had not yet been charted by the United Federation of Planets. (TOS: "Let That Be Your Last Battlefield")

The nebula's quadrant of origin was inferred from the location of other known astronimcal objects, Gacrux and Crux Arm, which were associated with the constellation Crux.
Information on this nebula was derived from the episodes and from real world sources.

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