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Sh 2-155

H II region in the constellation Cepheus

Summary

H II region in the constellation Cepheus

Field	Value
name	Sh 2-155
image	CaveHunterWilson.jpg
caption	Sh 2–155
type	Emission
epoch	J2000.0
ra	22h 57m 17.14s
dec	+62° 28′ 33.4"
dist_ly	2400
appmag_v	7.7
size_v	50.0'x30.0'
constellation	Cepheus
radius_ly	35
absmag_v	16
names	Sh 2-155, Caldwell 9, LBN 110.11+02.44

Sh 2-155 (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, though that name was applied earlier to Ced 201, a different nebula in Cepheus. Sh 2-155 is an ionized H II region with ongoing star formation activity, at an estimated distance of 725 parsecs (2400 light-years) from Earth.

Sh 2-155{{cite simbad |access-date=11 March 2017}} was first noted as a galactic emission nebula in 1959 in the extended second edition of the Sharpless catalogue,{{cite journal

Sh 2-155 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.{{Cite journal

Other name designations

Amateur photograph of the Cave Nebula in the [[Hubble palette

The 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.{{Cite book |access-date=11 March 2017}} or VdB 152,{{cite simbad |access-date=12 March 2017}}{{cite web |access-date=11 March 2017}} positioned at R.A.: 22h 13m 27s Dec.: +70° 15′ 18″ (2000). The name's application to Sh 2-155 has come into vogue through the nebula's inclusion in Moore's Caldwell catalogue{{cite book

References

(2006). "ChandraStudy of the Cepheus B Star-forming Region: Stellar Populations and the Initial Mass Function". The Astrophysical Journal Supplement Series.
(1959). "Photoelectric Photometry of the Association III Cephei.". The Astrophysical Journal.
(1970). "Four-color and H-beta photometry of open clusters - VI - the association III Cep.". The Astronomical Journal.
Patrick Moore (1990). ''The Amateur Astronomer'' (11th ed), W.W. Norton & Company, {{ISBN. 0-393-02864-X
(August 12, 2009). "Cepheus B: Trigger-Happy Star Formation".
(2009). "Protoplanetary Disk Evolution Around the Triggered Star-Forming Region Cepheus B". The Astrophysical Journal.

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

cepheus-(constellation) emission-nebulae sharpless-objects caldwell-objects star-forming-regions

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