Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)
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Cave Nebula, Darius Kopriva
Cave Nebula
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Cave Nebula

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Cave Nebula, Darius Kopriva
Cave Nebula
Powered byPixInsight

Cave Nebula

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Description

Sh2-155 (also designated Caldwell 9, Sharpless 155 or S155) is a diffuse nebula in the constellation Cepheus, within a larger nebula complex containing emission, reflection, and dark nebulosity. It is widely known as the Cave Nebula, though that name was applied earlier to Ced 201, a different nebula in Cepheus. Sh2-155 is an ionized H II region with ongoing star formation activity, at an estimated distance of 725 parsecs (2400 light-years) from Earth.

Sh2-155 was first noted as a galactic emission nebula in 1959 in the extended second edition of the Sharpless catalogue, being a part of the much larger Cep OB3 Association. Although Sh2-155 is relatively faint for amateur observation, some of its structure may be seen visually through a moderately sized telescope under dark skies.

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Cave Nebula, Darius Kopriva

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Southern Hemisphere Astro