View source for Astronomy:Coronet cluster

{{Infobox open cluster| <!-- put name or coordinates into the following URL -->
| name = Coronet Cluster
| image = R Coronae Australis region.jpg
| image_size = 300px
| caption = [[Astronomy:R Coronae Australis|R CrA]] region, with the Coronet Cluster in the centre, with [[Astronomy:Reflection nebula|reflection nebula]]e lit by [[Astronomy:TY Coronae Australis|TY CrA]] and HD 176386 to upper right, and the HD 176270/HD 176269 pair at lower right
| credit = [[Organization:European Southern Observatory|ESO]]
| epoch = J2000.0
| constellation = [[Astronomy:Corona Australis|Corona Australis]]
| class = II,3,m
| ra = {{RA|19|1|54}}
| dec = {{DEC|-36|57.2}}
| dist_ly = 420-550 [[Light year|ly]]
| dist_pc = 130-170 [[Astronomy:Parsec|pc]]   
| appmag_v = 8
| size_v = 26 arcmin
| mass_kg = 
| mass_msol = unknown
| radius_ly = 2.1 light years
| v_hb = 
| age = 0.5-2 million years
| notes = relative scarcity of circumstellar discs
| names = R CRA, G359.93-17.85 by BDB2003 catalog}}
The '''Coronet cluster''', also known as the [[Astronomy:R Coronae Australis|R CrA]] cluster after its best-known member, is a small [[Astronomy:Open cluster|open cluster]] located about 170 [[Astronomy:Parsec|parsec]]s away in the southern [[Astronomy:Constellation|constellation]] [[Astronomy:Corona Australis|Corona Australis]], isolated at the edge of the [[Astronomy:Gould Belt|Gould Belt]].<ref name="apod">{{cite web|accessdate=2016-12-30|title=APOD - Coronet in the Southern Crown|url=http://apod.nasa.gov/apod/ap070921.html}}</ref><ref>{{cite journal
|last=Sicilia-Aguilar|first=Aurora
|last2=Henning|first2=Thomas
|last3=Juha´sz|first3=Attila
|last4=Bouwman|first4=Jeroen
|last5=Garmire|first5=Gordon
|last6=Garmire|first6=Audrey
|title=VERY LOW MASS OBJECTS IN THE CORONET CLUSTER: THE REALM OF THE TRANSITION DISKS|journal=The Astrophysical Journal|volume=687
|issue=2
|pages=1145–1167
|date=10 November 2008|doi=10.1086/591932 |url=http://iopscience.iop.org/0004-637X/687/2/1145/pdf/0004-637X_687_2_1145.pdf|arxiv = 0807.2504 |bibcode = 2008ApJ...687.1145S }}</ref> The Coronet cluster is 3.5 times closer to the [[Astronomy:Earth|Earth]] than the Orion Nebula Cluster.<ref>{{cite web|title=Coronet Cluster: A Neighbor of Star Formation (A region of star formation about 420 light years from Earth.)|url=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.)|accessdate=10 Jan 2013}}</ref> The cluster center is composed of mostly young stars.<ref name=Slideshow>{{cite journal|bibcode=2012faph.confE..29S|title=The star formation and disk evolution history of a sparse region: The Coronet cluster|journal=Proceedings of the symposium "From Atoms to Pebbles: Herschel's view of Star and Planet Formation"|author1=Sicilia-Aguilar|first1=Aurora|last2=Henning|first2=Thomas|last3=Linz|first3=Hendrik|last4=Krause|first4=Oliver|last5=André|first5=Philippe|year=2012}}</ref> The variable [[Astronomy:T Coronae Australis|T Coronae Australis]] is also a member, only one arc minute from R CrA.

==References==

{{Reflist}}

[[Category:Gould Belt]]
[[Category:Open clusters]]
[[Category:Corona Australis]]
[[Category:NGC objects]]



{{Sourceattribution|Coronet cluster|1}}