description IC 1805 Overview
IC 1805, commonly known as the Heart Nebula, is a large emission nebula located in the constellation Cassiopeia. The nebula's distinctive shape and red glow are generated by ionized hydrogen gas illuminated by the radiation of the young open star cluster Melotte 15 at its center. Positioned roughly 7,500 light-years from Earth, it is a site of active star formation containing dark dust lanes that obscure background light. The structure is primarily targeted by amateur astronomers and astrophotographers due to its size and brightness.
help IC 1805 FAQ
Can the Heart Nebula be seen through an ordinary backyard telescope?
The stars of the region are accessible, but the nebula itself has very low surface brightness and is difficult to see visually. Long-exposure photography, often with a hydrogen-alpha filter, reveals IC 1805 far more clearly.
Why does IC 1805 glow red in photographs?
Ultraviolet radiation from young, massive stars ionizes surrounding hydrogen, which emits strongly at the red hydrogen-alpha wavelength. Many narrowband images also map sulfur and oxygen emissions into separate colors.
What is Melotte 15 inside the Heart Nebula?
Melotte 15 is the young open star cluster near the center of IC 1805. Its hot stars, roughly 1.5 million years old, produce radiation and stellar winds that sculpt the surrounding gas and dust.
How large and distant is the Heart Nebula?
IC 1805 lies about 7,500 light-years away toward Cassiopeia in the Milky Way's Perseus arm. The full nebula spans roughly 200 light-years, despite appearing only a few degrees wide from Earth.
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