NGC 1851
Properties
Position & Identifiers
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NGC 1851 · 9.0′ diameter · N up, E left
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About NGC 1851
Description
NGC 1851 is a bright, concentrated globular cluster in Columba, about 39,500 light-years away. It has a dense core and spans about 11 arcminutes, with an integrated magnitude of 7.3 making it one of the brightest globulars in the southern sky.
Observing Tips
Visible as a bright, concentrated glow in a 4-inch telescope. An 8-inch scope begins to resolve the outer stars at 150x+. The dense core remains unresolved in amateur scopes. Best in winter evenings.
History
Discovered by James Dunlop on November 29, 1826 from Australia. It has an unusual double main sequence, suggesting it may have formed from the merger of two clusters or have two distinct stellar populations.
Fun Facts
NGC 1851 has two distinct populations of stars with different chemical compositions, a phenomenon seen in only a few globular clusters. This suggests a complex formation history, possibly involving the merger of two smaller clusters.