Coalsack Dark Nebula (Caldwell 99)

The Coalsack Nebula or Caldwell 99 is the most prominent dark nebula in the sky, easily visible to the naked eye as a dark patch silhouetted against the southern Milky Way. Located in the constellation Crux, it has an angular diameter is 400x300 arc-minutes and lies at an estimated distance of 610 light years. The Equinox 2000 coordinates are 12h 53.0m, -63° 00´ which makes the Coalsack a Southern Hemisphere object that is best seen during the spring. The Caldwell Spring Star Chart shows the position of all Caldwell objects visible during that season. Visit the Caldwell Catalog Photo Gallery to see more objects from this catalog.

See Wikipedia for more details.

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