C73
NGC 1851
Dados do Objeto
- Designação do Catálogo
- C73
- Tipo
- GlobularCluster
- Constelação
- Columba
- Magnitude
- 7.3
- Ascensão Reta
- 05h 14m 06.7s
- Declinação
- -40° 02' 49.2"
- Distância
- 39,400 anos-luz
- Tamanho Angular
- 11
Imagem de Levantamento
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Sobre C73
Descrição
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.
Dicas de Observação
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.
História
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.
Curiosidades
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.
Fotos da Comunidade (1)
Credit: NASA Hubble Space Telescope. License: CC BY 2.0. (Wikimedia Commons)
Skybred Mar 2, 2026