| Emission nebula | |
|---|---|
| H II region | |
 Sh 2-54 nebula surrounding the star cluster NGC 6604 | |
| 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 |
| Physical characteristics | |
| Radius | 126.25 ly |
| Designations | RCW 167, Gum 84/85, W35, LBN 72[1] |
Sh 2-54 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]
Sh 2-54 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]
- ^ 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.