Astronomy:Sh2-54

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Short description: Nebula in the constellation Serpens
Sh2-54
Emission nebula
H II region
The star cluster NGC 6604 and its surroundings.jpg
Sh2-54 nebula surrounding the star cluster NGC 6604
Credit: ESO
Observation data: J2000 epoch
Right ascension 18h 17m 53s[1]
Declination−11° 40′ 58″[1]
Distance6,200[2] ly
Apparent dimensions (V)140 arcmins[3]
ConstellationSerpens
Physical characteristics
Radius126.25 ly
DesignationsRCW 167, Gum 84/85, W35, LBN 72[1]
See also: Lists of nebulae

Sh2-54 is an extended bright nebula in the constellation of Serpens.[1]

In its core there are many protostars and many infrared sources; some of these sources, like IRAS 18151−1208, are most probably very young high-mass stars.[4] The older star population in this region has an average age of 4–5 million years, and its components are grouped in the open cluster NGC 6604.[2]

Sh2-54 belongs to an extended nebulosity that includes also the Eagle Nebula and the Omega Nebula.[5] The young high-mass stars of this region constitute the Serpens OB1 and Serpens OB2 OB association.[2]

Gallery

  • Serpent's Nebula[6]

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 "SH 2-54". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=SH+2-54. 
  2. ↑ 2.0 2.1 2.2 Reipurth, B. (December 2008). "The Young Cluster NGC 6604 and the Serpens OB2 Association". Handbook of Star Forming Regions, Volume II: The Southern Sky 5: 590. Bibcode: 2008hsf2.book..590R. 
  3. ↑ Sharpless, Stewart (December 1959). "A Catalogue of H II Regions". Astrophysical Journal Supplement 4: 257. doi:10.1086/190049. Bibcode: 1959ApJS....4..257S. 
  4. ↑ Davis, C. J.; Varricatt, W. P.; Todd, S. P.; Ramsay Howat, S. K. (October 2004). "Collimated molecular jets from high-mass young stars: IRAS 18151-1208". Astronomy and Astrophysics 425 (3): 981–995. doi:10.1051/0004-6361:20041298. Bibcode: 2004A&A...425..981D. 
  5. ↑ Sofue, Y.; Handa, T.; Fuerst, E.; Reich, W. et al. (1986). "Giant stellar-wind shell associated with the H II region M16". Publications of the Astronomical Society of Japan 38: 347–360. Bibcode: 1986PASJ...38..347S. 
  6. ↑ "Serpent's Nebula" (in en). https://noirlab.edu/public/images/iotw2104a/. 

External links

Coordinates: Sky map 18h 17m 53s, −11° 40′ 58″



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