M79
NGC 1904
Properties
Position & Identifiers
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M79 · 7.2′ diameter · N up, E left
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About M79
Description
M79 is a bright globular cluster in Lepus, about 42,100 light-years from Earth. It is unusual because it lies in the opposite direction from the galactic center — most globulars cluster around Sagittarius. M79 spans about 118 light-years and is moderately concentrated, with a well-defined core.
Observing Tips
Located about 4 degrees south-southwest of Beta Leporis (Nihal). Easily found by star-hopping from Alpha and Beta Leporis. In binoculars it appears as a small, bright fuzzy star. A 6-inch telescope shows a compact, concentrated core. An 8-inch at 150x begins to resolve stars at the edges. M79 is one of the few globular clusters well-placed for winter observation, when most globulars are below the horizon. Best observed from December through February.
History
Discovered by Pierre Mechain on October 26, 1780. Charles Messier cataloged it on December 17, 1780. Its position far from the galactic center puzzled astronomers for centuries.
Fun Facts
M79's anomalous position — far from the galactic center — has been explained by its likely origin in the Canis Major Dwarf Galaxy, a small satellite galaxy being absorbed by the Milky Way. M79 is one of few winter globular clusters, making it a welcome sight for observers who associate globulars primarily with summer skies.