Iris Nebula
NGC 7023
Dados do Objeto
- Designação do Catálogo
- C4
- Tipo
- ReflectionNebula
- Constelação
- Cepheus
- Magnitude
- 6.8
- Ascensão Reta
- 21h 01m 48.0s
- Declinação
- +68° 12' 00.0"
- Distância
- 1,300 anos-luz
- Tamanho Angular
- 18
Imagem de Levantamento
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Sobre Iris Nebula
Descrição
The Iris Nebula (NGC 7023) is a bright reflection nebula in Cepheus, about 1,300 light-years away. It is illuminated by the young B-type star HD 200775 at its center. The blue reflection nebula spans about 6 arcminutes and is surrounded by a large region of dusty nebulosity.
Dicas de Observação
Visible as a hazy glow around a bright star in a 4-inch telescope. Larger scopes (8-inch and up) begin to show the nebula's shape. No nebula filter is needed since it is a reflection nebula. Best observed in autumn evenings.
História
Discovered by William Herschel on October 18, 1794. The Iris Nebula has become one of the most popular astrophotography targets, revealing intricate dust structures and beautiful blue hues in long exposures.
Curiosidades
The Iris Nebula contains polycyclic aromatic hydrocarbons (PAHs) in the surrounding dust. Deep images show red fluorescent emission from these carbon-based molecules alongside the blue reflected starlight.
Fotos da Comunidade (1)
Credit: Andreigusan This is a featured picture on the Persian language Wikipedia (نگارههای برگزیده) and is considered one of the finest images. See its nomination here. If you think this.... License: CC BY-SA 4.0. (Wikimedia Commons)
Skybred Mar 2, 2026