=MsoNormal
=18.0ptThe Cave Nebula Sh2-155=MsoNormal
Sh2-155 (also designated
Caldwell 9,
Sharpless 155 or
S155, or
LBN529) 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, at an estimated distance of 725 parsecs (2400 light-years) from Earth.
[2][3] =MsoNormalSh2-155
[4] was first noted as a galactic emission nebula in 1959 in the extended second edition of the
Sharpless catalogue,
[5] =MsoNormal
=18.0ptOther name designations=MsoNormal
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Amateur photograph of the Cave Nebula in the
Hubble palette =MsoNormalThe name "Cave Nebula" was coined for this object by
Patrick Moore, presumably derived
from photographic images showing a curved arc of emission nebulosity corresponding to a cave mouth.
[12] The name was also used earlier to refer to another brighter but unrelated reflection nebula in Cepheus known as Ced 201
[13] or VdB 152,
[14][15] positioned at
R.A.: 22h 13m 27s
Dec.: +70° 15′ 18″ (
2000). The name's application to Sh2-155 has come into vogue through the nebula's inclusion in Moore's
Caldwell catalogue[16] as object Caldwell 9. (
SIMBAD lists the name for Ced 201, but not for Sh2-155.)
[4][13] Wikipedia
This image was one I had been working on for a while and rather difficult to process due to the faint nebulosity.
It was photographed in Borrego Springs, California on Oct 28 and 29, 2023 under Bortle 4 sky during the annual Nightfall star party, a very enjoyable event with many interesting speakers.
One of the highlights was an in depth processing presentation by one of our Pixinsight Masters, Ron Brecher, who was kind enough to assist me in my fumbling efforts at collimating my Celestron C8 HD that evening.
"Keep that collimating star in the center of the field". And no, I did not log my collimating knob adjustments, Ron.
All of this was going on while imaging the Cave with my Takahashi 106.
I love my Takahashi. No collimating. Sharp stars and easy to set up....
I chose 60 second subs due to the variable clouds entering the area and was able to extract enough data to get a nice image with 275 - 60 sec subs.
Processing was performed in Pixinsight.
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