Astronomy:Sh 2-21
From HandWiki
| Emission nebula | |
|---|---|
| H II region | |
 As seen by the legacy survey | |
| Observation data: J2000 epoch | |
| Right ascension | 17h 51m 42s |
| Declination | −28° 54′ 00″[1] |
| Distance | 26100 ly (7600 pc) |
| Apparent magnitude (V) | 12.15[2] |
| Apparent dimensions (V) | 10'[3] |
| Constellation | Sagittarius |
| Physical characteristics | |
| Radius | 38 ly |
| Designations | RCW 142, LBN 4 |
Sh 2-21 is an emission nebula in the constellation Sagittarius. It is part of the Sharpless Catalog assembled by Stewart Sharpless. It is associated with four infrared clusters, [DB2000] 7, [DB2000] 10, [DB2000] 11 and [DB2000] 12. Open cluster Collinder 351 is included as part of the nebula complex.[4]
References
- ↑ "Sh 2-21". https://simbad.u-strasbg.fr/simbad/sim-id?Ident=SH+2-21&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id.
- ↑ "Sharpless (Sh2) - Astrobasics". 13 September 2022. https://astrobasics.de/galerie/kataloge/sh2/#object-10433.
- ↑ "CCD Images of the Sharpless Catalog". http://www.sharplesscatalog.com/sharpless.aspx.
- ↑ "Sh 2-21". http://galaxymap.org/cat/view/sharpless/21.
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