Editing Coma Berenices (section)

=== Star clusters ===

==== Coma Star Cluster ====
The [[Coma Star Cluster]] represents Berenice's sacrificed tresses and as a naked eye object has been known since antiquity, appearing in Ptolemy's ''[[Almagest]]''.<ref>{{cite web | url =https://britastro.org/node/6424|title=A binocular star cluster for spring skies|publisher=[[British Astronomical Association]]| author=Stewart Moore| access-date =8 September 2017}}</ref> It doesn't have a Messier or NGC designation, but is in the [[Melotte catalogue]] of open clusters (designated Melotte 111) and is also catalogued as Collinder 256. It is a large, diffuse [[open cluster]] of about 50 stars ranging between magnitudes five and ten, including several of Coma Berenices' stars which are visible to the naked eye. The cluster is spread over a huge region (more than five degrees across) near [[Gamma Comae Berenices]]. It has such a large apparent size because it is relatively close, only 280 light-years or 86 parsecs away.<ref name=vanleeuwen09>{{cite journal |title=Parallaxes and proper motions for 20 open clusters as based on the new Hipparcos catalogue |journal=Astronomy and Astrophysics |first=F. |last=van Leeuwen |volume=497 |issue=1 |pages=209–242 |date=April 2009 |bibcode=2009A&A...497..209V |doi=10.1051/0004-6361/200811382|arxiv = 0902.1039 |s2cid=16420237 }}</ref><ref name=majaess11>{{cite journal |title=Deep Infrared ZAMS Fits to Benchmark Open Clusters Hosting Delta Scuti Stars |journal=Journal of the American Association of Variable Star Observers |first1=D. |last1=Majaess |first2=D. |last2=Turner |first3=D. |last3=Lane |first4=T. |last4=Krajci |volume=39 |issue=2 |page=219 |date=September 2011 |bibcode=2011JAVSO..39..219M |arxiv=1102.1705}}</ref>

==== Globular clusters ====
[[Messier 53|M53]] (NGC 5024) is a [[globular cluster]] which was discovered independently by [[Johann Elert Bode]] in 1775 and [[Charles Messier]] in February 1777; [[William Herschel]] was the first to resolve it into stars.<ref name="m53">{{cite web | url =http://messier.seds.org/m/m053.html|title=Messier 53 |publisher=The Messier Catalog| access-date =24 November 2016}}</ref> The magnitude-7.7 cluster is 56,000 light-years from Earth. Only 1° away is [[NGC 5053]], a globular cluster with a sparser nucleus of stars. Its total luminosity is the equivalent of about 16,000 suns, one of the lowest luminosities of any globular cluster. It was discovered by William Herschel in 1784. [[NGC 4147]] is a somewhat dimmer globular cluster, with a much-smaller [[Angular diameter|apparent size]] and an apparent magnitude of 10.7.<ref name=aj144_5_126>{{citation
 | display-authors=1
 | last1=Dalessandro | first1=Emanuele
 | last2=Schiavon | first2=Ricardo P.
 | last3=Rood | first3=Robert T.
 | last4=Ferraro | first4=Francesco R.
 | last5=Sohn | first5=Sangmo T.
 | last6=Lanzoni | first6=Barbara
 | last7=O'Connell | first7=Robert W. 
 | title=Ultraviolet Properties of Galactic Globular Clusters with Galex. II. Integrated Colors 
 | journal=The Astronomical Journal
 | volume=144 | issue=5 | id=126 | pages=13 | date=November 2012
 | doi=10.1088/0004-6256/144/5/126 
 | bibcode=2012AJ....144..126D | arxiv=1208.5698
 | s2cid=56419886 | postscript=.
}}</ref>