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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]
Distance 6,200[2] ly
Apparent dimensions (V) 140 arcmins[3]
Constellation Serpens
Designations RCW 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 millions 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]

See also[edit]


  1. ^ a b c d "SH 2-54". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2011-06-05. 
  2. ^ a b c 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. 
  3. ^ Sharpless, Stewart (December 1959). "A Catalogue of H II Regions". Astrophysical Journal Supplement. 4: 257. Bibcode:1959ApJS....4..257S. doi:10.1086/190049. 
  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. Bibcode:2004A&A...425..981D. doi:10.1051/0004-6361:20041298. 
  5. ^ Sofue, Y.; Handa, T.; Fuerst, E.; Reich, W.; et al. (1986). "Giant stellar-wind shell associated with the H II region M16". Astronomical Society of Japan. 38: 347–360. Bibcode:1986PASJ...38..347S. 

External links[edit]

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