Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)
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SH2-155  Caldwell 9  The Cave Nebula, Albert  Christensen
SH2-155  Caldwell 9  The Cave Nebula
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SH2-155 Caldwell 9 The Cave Nebula

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SH2-155  Caldwell 9  The Cave Nebula, Albert  Christensen
SH2-155  Caldwell 9  The Cave Nebula
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SH2-155 Caldwell 9 The 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. 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.   (Wikipedia)

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Revisions

  • SH2-155  Caldwell 9  The Cave Nebula, Albert  Christensen
    Original
  • SH2-155  Caldwell 9  The Cave Nebula, Albert  Christensen
    B
  • Final
    SH2-155  Caldwell 9  The Cave Nebula, Albert  Christensen
    C

B

Description: ReStack and reprocess using different procedures in Pixinsight and DSS.

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C

Description: Found the original O3 images were poorly focused. Retook 31 new O3 images and reprocessed.

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SH2-155  Caldwell 9  The Cave Nebula, Albert  Christensen