Jump to content

Sh 2-155

From Wikipedia, the free encyclopedia

This is an old revision of this page, as edited by Arianewiki1 (talk | contribs) at 06:12, 11 March 2017 ("Other Names" as a title is clearly wrong, (Sh-155 has one name). It is confusion between two separate objects with the same name). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Sh2-155
Emission nebula
Sh2–155
Observation data: J2000.0 epoch
Right ascension22h 57m 17.14s
Declination+62° 28′ 33.4"
Distance2400 ly
Apparent magnitude (V)7.7
Apparent dimensions (V)50.0'x30.0'
ConstellationCepheus
Physical characteristics
Radius35 ly
Absolute magnitude (V)16
DesignationsSh2-155, Caldwell 9
See also: Lists of nebulae

Sh2-155[1] (old designation S 155), also tentatively known as the Cave Nebula, is a faint and diffuse bright nebula within a larger nebula complex containing emission, reflection, and dark nebulosity. It is in the constellation Cepheus.

Sh2-155 was first noted as an galactic emission in 1959 in the extended edition of the Sharpless catalogue[2], being a part of the much larger Cep III Association.[2] Although telescopically very faint, some of Sh-155's structure may be seen visually through a moderately sized telescope under dark skies.[3][4] Radiation pressure exerted from a nearby O-type star may be triggering star formation in this nebula.[5]

Other name designations

The proposed name "Cave Nebula" was coined by Patrick Moore, presumably derived from photographic images showing a curved arc of emission nebulosity corresponding to a cave mouth.[6] The name "Cave Nebula" is used for another reflection nebula in Cepheus known as Ced 201,[7] or VdB 152,[8] positioned at R.A.: 22h 13m 27s Dec.: +70° 15′ 18" (2000). Its common name is a recent invention, which has only come into vogue mostly through the creation of the Caldwell catalogue[9] as object Caldwell 9. SIMBAD does not recognise the name "Cave Nebula" for Sh2-155, but does in the case of Ced 201.[1][7]

References

  1. ^ a b "Sh2-155 – SIMBAD". simbad.u-strasbg.fr. Retrieved 11 March 2017.
  2. ^ a b Sharpless, S. (1959). "A Catalogue of H II Regions". Astrophysical Journal Supplement. 4: 257. Bibcode:1959ApJS....4..257S. doi:10.1086/190049. Retrieved 9 March 2017.
  3. ^ Patrick Moore (1990). The Amateur Astronomer (11th ed), W.W. Norton & Company, ISBN 0-393-02864-X
  4. ^ Trusock, T. (11 March 2017). "The Caldwell Objects – Deep Sky Companions" (PDF).
  5. ^ Chen; et al. (2010). "Radiation-driven implosion in the Cepheus B molecular cloud". Research in Astronomy and Astrophysics. 10: 777. arXiv:1004.5171. Bibcode:2010RAA....10..777C. doi:10.1088/1674-4527/10/8/007. {{cite journal}}: Explicit use of et al. in: |last2= (help)
  6. ^ Mobberley, M. (9 March 2017). "The Caldwell Objects and How to Observe Them".
  7. ^ a b "Ced 201 – SIMBAD". simbad.u-strasbg.fr. Retrieved 11 March 2017.
  8. ^ "APOD: 2012 October 31 - VdB 152: A Ghost in Cepheus". apod.nasa.gov. Retrieved 11 March 2017.
  9. ^ O'Meara, Stephen James (2002). The Caldwell Objects. Cambridge University Press. ISBN 978-0-521-82796-6.
Wikimedia Commons has media related to Cave Nebula.
Retrieved from "https://en.wikipedia.org/enwiki/w/index.php?title=Sh_2-155&oldid=769714974"