The Cave Nebula or Caldwell 9 (also designated Sharpless 155 – Sh2-155) is a diffuse nebula which is in the constellation Cepheus and contains emission, reflection, and dark nebulosity which is 2500Ly away. Sh2-155 is an ionized HII region with ongoing star formation.
The Nebula was first observed by Dr Kopff in 1908 (Wolf 1908) while observing a star B.D +69, 1231 while using Dr wolf’s telescope on the 21st of October 1908, which later he went on to photograph himself using another reflector telescope, and later that same year including it in a published paper.
SH2-155 is a very faint object which some structures can be seen under very dark skies with a moderately sized scope.
Sh2-155 belongs to the Cepheus Molecular Cloud which has been observed and studied showing the Young Stellar Object a progression of stellar gas in front of the cloud.
The Name ‘Cave Nebula’ was coined by the late Sir Patrick Moore and others due to the appearance of a cave mouth. The sh2- 155 was given Caldwell 9 (C9) by Sir Patrick Moore in his Caldwell catalogue which was designed to complement the messier catalogue.
The Nebula was first observed by Dr Kopff in 1908 (Wolf 1908) while observing a star B.D +69, 1231 while using Dr wolf’s telescope on the 21st of October 1908, which later he went on to photograph himself using another reflector telescope, and later that same year including it in a published paper.
SH2-155 is a very faint object which some structures can be seen under very dark skies with a moderately sized scope.
Sh2-155 belongs to the Cepheus Molecular Cloud which has been observed and studied showing the Young Stellar Object a progression of stellar gas in front of the cloud.
The Name ‘Cave Nebula’ was coined by the late Sir Patrick Moore and others due to the appearance of a cave mouth. The sh2- 155 was given Caldwell 9 (C9) by Sir Patrick Moore in his Caldwell catalogue which was designed to complement the messier catalogue.
The Pictures above are 15 hours of exposure at 10-minute (600 seconds) exposures over 4 nights during March 2022. All stacked in Deep Sky Stacker and processed in Pixinsight. Using some of the scripts to bring out the dark structures and reduce background noise makes this target pop.
The Hubble pallet was done by separating the channels and using pixelmath to combine the channels to make a gold style HII (Red channel) pallet which also helps bring out the blue with a further combination of channels for the blue channel.
This was taken with my Skywatcher 72ed and ZWO Asi 533mc Pro. all controlled with the ZWO ASIAir
Processing was done with DeepSkyStacker and Pixinsight
The Hubble pallet was done by separating the channels and using pixelmath to combine the channels to make a gold style HII (Red channel) pallet which also helps bring out the blue with a further combination of channels for the blue channel.
This was taken with my Skywatcher 72ed and ZWO Asi 533mc Pro. all controlled with the ZWO ASIAir
Processing was done with DeepSkyStacker and Pixinsight