Iris Nebula
NGC 7023
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Iris Nebula 소개
설명
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.
관측 팁
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.
역사
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.
재미있는 사실
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.
커뮤니티 사진 (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