Sh2-54 Knowpia

Sh2-54
Emission nebula
H II region
	Sh2-54 nebula surrounding the star cluster NGC 6604
Observation data: J2000 epoch
Right ascension	18h 17m 53s
Declination	−11° 40′ 58″
Distance	6,200 ly
Apparent dimensions (V)	140 arcmins
Constellation	Serpens
Physical characteristics
Radius	126.25 ly
Designations	RCW 167, Gum 84/85, W35, LBN 72
	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 edit

Serpent's Nebula^[6]

References edit

^ ^a ^b ^c ^d "SH 2-54". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2011-06-05.
^ ^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. Bibcode:2008hsf2.book..590R.
^ Sharpless, Stewart (December 1959). "A Catalogue of H II Regions". Astrophysical Journal Supplement. 4: 257. Bibcode:1959ApJS....4..257S. doi:10.1086/190049.
^ 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.
^ 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.
^ "Serpent's Nebula". noirlab.edu/public/. Retrieved 3 February 2021.