Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  IC 1795  ·  IC 1805  ·  NGC 896
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IC 1805 Heart Nebula, Roberto Marinoni
IC 1805 Heart Nebula
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IC 1805 Heart Nebula

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IC 1805 Heart Nebula, Roberto Marinoni
IC 1805 Heart Nebula
Powered byPixInsight

IC 1805 Heart Nebula

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Description

IC 1805 (also known as the Heart Nebula or by the acronym W4) is a diffuse nebula associated with an open cluster, visible in the constellation Cassiopeia.
This is a very large HII region, whose distance is estimated at 7500 light years from us; its main characteristic is the presence of two large apparently empty areas of different sizes, which make the nebula similar to a "heart".
Inside there is a system of small, poorly concentrated open clusters, responsible for the ionization of the nebula: the most notable of these is Melotte 15, which contains some stars about 50 times more massive than the Sun.

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