Caldwell 9 - The Cave Nebula (Monty Chandler)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: HD216102 · HD216380 · HD216425 · HD216532 · HD216629 · HD216658 · HD216711 · HD216898 · HD217035 · HD217061 · HD217086 · HD217099 · HD217312 · HD217463 · HD217657 · HD217730 · HD217872 · HD217966 · HD217979 · HD218066 · HD218139 · HD218229 · HD218342 · HD218450 · HD218537 · LBN 522 · LBN 524 · LBN 527 · LBN 529 · LDN 1211 · And 9 more.

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Caldwell 9 - The Cave Nebula

Link: https://montychandler.smugmug.com/Astrophotography/Nebula/i-JGWFPpx/A

Powered byPixInsight

Caldwell 9 - The Cave Nebula

Link: https://montychandler.smugmug.com/Astrophotography/Nebula/i-JGWFPpx/A

Sh2-155 (also designated Caldwell 9) is a faint diffuse nebula in the constellation Cepheus. It is widely known as the Cave Nebula.

The image consists of subs taken from the hills of Burke County, NC from Nov & Dec '20 along with subs from Jan, May, June & July of '21 - 220 subs totaling 19.5 hours of exposure.

Acquisition hardware: EQ6r Pro, WO Z73, ASI071MC Pro, Radian Quad Ultra, Polemaster, Senso Sesto 2, WO 50-200mm guidescope, ASI 120mm, and NUC.

Acquisition software: APT, PHD2, EQMOD, W10 pro.

Processed manually in Pixinsight

Roughly 2,400 light-years away and lying in the plane of our Milky Way galaxy, the Cave Nebula is a diffuse emission nebula,within a larger nebula complex that includes a reflection nebula, and dark nebula. It is formed of gases that emit their own light. The bright arc that forms the mouth of the cave is an active birthplace for stars, known as an H II region, where hot clouds of atomic hydrogen have become ionized.
Having a magnitude of about 8 and a span of roughly 40 light-years, Caldwell 9 is a diffuse and low-contrast object, so it can still be difficult to find in the sky. Caldwell 9 is tantalizing to researchers because, according to radio and near-infrared studies of this nebula, the area is bursting with young, hot stars popping into existence.

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B

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Status	Advanced success
Started	...
Astrometry.net job	6511326
PixInsight job	2WMHT5EGN70LNH1R7GGJPY254ALSL4LI
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	22h58m08s.76
RA (top/left)	22h48m25s.85
RA (top/right)	23h12m08s.14
RA (bottom/right)	23h08m42s.13
RA (bottom/left)	22h43m41s.88

Dec (center)	+62°34′47″.4
Dec (top/left)	+61°18′38″.4
Dec (top/right)	+62°02′59″.1
Dec (bottom/right)	+63°48′23″.6
Dec (bottom/left)	+63°01′12″.2

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Caldwell 9 - The Cave Nebula

Caldwell 9 - The Cave Nebula

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Caldwell 9 - The Cave Nebula

Caldwell 9 - The Cave Nebula

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