Astronomy:Coronet Cluster
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Short description: Star in the constellation Corona Australis
| Coronet Cluster | |
|---|---|
 The Coronet Cluster, R CrA is the central dominantly bright star, with reflection nebulae NGC 6726/NGC 6727 lit by TY CrA and HD 176386 to upper right and parts of IC 4812 at the lower right. | |
| Observation data (J2000.0 epoch) | |
| Constellation | Corona Australis |
| Right ascension | 19h 1m 54s |
| Declination | −36° 57.2′ |
| Distance | 420–550 ly (130–170 pc) |
| Apparent magnitude (V) | 8 |
| Apparent dimensions (V) | 26 arcmin |
| Physical characteristics | |
| Mass | unknown M☉ |
| Radius | 2.1 light years |
| Estimated age | 0.5–2 million years |
| Notable features | relative scarcity of circumstellar discs |
| Other designations | R CRA, G359.93-17.85 by BDB2003 catalog |
The Coronet Cluster, also known as the R CrA cluster after its best-known member, is a small open cluster located about 170 parsecs away in the southern constellation Corona Australis, isolated at the edge of the Gould Belt.[1][2] The Coronet Cluster is 3.5 times closer to the Earth than the Orion Nebula Cluster.[3] The cluster center is composed of mostly young stars.[4] The variable T Coronae Australis is also a member, only one arc minute from R CrA.
References
- ↑ "APOD - Coronet in the Southern Crown". http://apod.nasa.gov/apod/ap070921.html. Retrieved 2016-12-30.
- ↑ Sicilia-Aguilar, Aurora; Henning, Thomas; Juha´sz, Attila; Bouwman, Jeroen; Garmire, Gordon; Garmire, Audrey (10 November 2008). "Very Low Mass Objects in the Coronet Cluster: The Realm of the Transition Disks". The Astrophysical Journal 687 (2): 1145–1167. doi:10.1086/591932. Bibcode: 2008ApJ...687.1145S. http://iopscience.iop.org/0004-637X/687/2/1145/pdf/0004-637X_687_2_1145.pdf.
- ↑ "Coronet Cluster: A Neighbor of Star Formation (A region of star formation about 420 light years from Earth.)". http://sfccanth.wetpaint.com/photo/9452330/Coronet+Cluster%3A+A+Neighbor+of+Star+Formation+(A+region+of+star+formation+about+420+light+years+from+Earth.). Retrieved 10 Jan 2013.
- ↑ Sicilia-Aguilar, Aurora; Henning, Thomas; Linz, Hendrik; Krause, Oliver; André, Philippe (2012). "The star formation and disk evolution history of a sparse region: The Coronet cluster". Proceedings of the Symposium "From Atoms to Pebbles: Herschel's View of Star and Planet Formation": 29. Bibcode: 2012faph.confE..29S.
External links
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