Sh2-155 The Cave Nebula (Dave Boddington)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: HD216102 · HD216103 · HD216380 · HD216425 · HD216532 · HD216572 · HD216629 · HD216658 · HD216711 · HD216898 · HD216926 · HD217035 · HD217061 · HD217086 · HD217099 · HD217312 · HD217463 · HD217657 · HD217730 · HD217872 · HD217966 · HD217979 · HD218066 · HD218139 · HD218229 · HD218342 · LBN 521 · LBN 524 · LBN 527 · LBN 529 · And 9 more.

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Sh2-155 The Cave Nebula

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Sh2-155 The Cave Nebula

The Cave Nebula and surrounding area imaged over the last week through my Esprit100/SX46 and GT71/ASI1600. 2hrs Lum and 4.5hrs each RGB on the Esprit100 and 8hrs Ha on the GT71. Processed in Pixinsight, APP and Photoshop.

From Wiki…. 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 2400 light-years from Earth.

Sh2-155[4] 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.

Sh2-155 lies at the edge of the Cepheus B cloud (part of the Cepheus molecular cloud), and is ionized by young stars from the Cep OB3 association. It has been suggested that radiation from the hot O-type star HD 217086 is compressing the region, triggering the formation of a new generation of stars. A study of the region's young stellar objects by the Chandra X-ray Observatory and Spitzer Space Telescope shows a progression of stellar ages in front of the cloud, supporting the hypothesis of triggered star-formation

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Status	Advanced success
Started	...
Astrometry.net job	3898152
PixInsight job	5QNQ7H6LN2P1KEGVG4M7TAEKSJG7LNOK
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	22h56m21s.23
RA (top/left)	23h04m45s.64
RA (top/right)	23h06m27s.85
RA (bottom/right)	22h47m06s.45
RA (bottom/left)	22h47m06s.90

Dec (center)	+62°14′11″.9
Dec (top/left)	+60°50′04″.6
Dec (top/right)	+63°31′24″.9
Dec (bottom/right)	+63°36′25″.8
Dec (bottom/left)	+60°54′30″.8

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Sh2-155 The Cave Nebula

Sh2-155 The Cave Nebula

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