description Fishhead Nebula (IC 1795) Overview
IC 1795, known as the Fishhead Nebula, is a bright emission nebula in the constellation Cassiopeia. It is part of the same broad star-forming complex as the Heart Nebula, IC 1805, and is illuminated by young, hot stars whose radiation excites the surrounding hydrogen gas. The Fishhead name refers to the shape of its brighter northern region in wide-field images. The object is of interest to observers studying nebular structure and massive-star formation.
help Fishhead Nebula (IC 1795) FAQ
What is the Fishhead Nebula?
The Fishhead Nebula is the popular name for IC 1795, a bright emission nebula and star-forming region in Cassiopeia. It is also associated with the catalog designation NGC 896.
How is IC 1795 connected to the Heart Nebula?
IC 1795 lies next to IC 1805, the much larger region commonly called the Heart Nebula. Both belong to the same broad complex of glowing gas, dust, and young stars in Cassiopeia.
Is the Fishhead Nebula a planetary nebula?
No. IC 1795 is an emission nebula or H II region, where ionized gas glows around young stars. A planetary nebula, such as NGC 6905, is instead the expelled shell of a dying star.
Why does IC 1795 look like a fish head in photographs?
Long-exposure images reveal a bright, shaped region of glowing hydrogen and obscuring dust that resembles a fish's head. The apparent shape is a visual nickname, not an indication that the nebula contains a literal fish-like object.
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