C7
NGC 2403
Barred Spiral
Propriedades
Posição e Identificadores
Visibilidade
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Sobre C7
Descrição
NGC 2403 is a bright spiral galaxy in Camelopardalis, about 8 million light-years away. It is a member of the M81 group and resembles a smaller version of M33, with prominent HII regions and well-defined spiral arms.
Dicas de Observação
One of the brightest galaxies outside the Messier catalog, visible in binoculars from dark sites as a faint smudge. A 6-inch telescope shows an elongated glow with a brighter core. Larger scopes reveal hints of spiral structure. Best in winter and spring evenings.
História
Discovered by William Herschel on November 1, 1788. In 1954, Allan Sandage used Cepheid variable stars in NGC 2403 to refine the extragalactic distance scale.
Curiosidades
NGC 2403 has produced two observed supernovae: SN 1954J and SN 2004dj. Its giant HII regions rival the Tarantula Nebula in luminosity.
Fotos da Comunidade (1)
Credit: Image Data - Subaru Telescope (NAOJ), Hubble Legacy Archive; Processing - Robert Gendler. License: CC BY 4.0. (Wikimedia Commons)
Skybred Mar 2, 2026