Editing Beehive Cluster (section)

== Planets ==
In September 2012, two planets which orbit separate stars were discovered in the Beehive Cluster. The finding was significant for being the first planets detected orbiting stars like [[Earth]]'s [[Sun]] that were situated in stellar clusters. Planets had previously been detected in such clusters, but not orbiting stars like the Sun.<ref name="Quinn2012"/>

The planets have been designated [[Pr0201 b]] and [[Pr0211 b]]. The 'b' at the end of their names indicates that the bodies are planets. The discoveries are what have been termed [[hot Jupiter]]s, massive [[gas giants]] that, unlike the planet [[Jupiter]], orbit very close to their parent stars.<ref name="Quinn2012"/>

The announcement describing the planetary finds, written by Sam Quinn as the lead author, was published in the [[The Astrophysical Journal|''Astrophysical Journal'']] Letters. Quinn's team worked with David Latham of the [[Harvard–Smithsonian Center for Astrophysics]], utilizing the [[Smithsonian Astrophysical Observatory]]'s [[Fred Lawrence Whipple Observatory]].<ref name="Quinn2012"/><ref>{{Cite web|url=http://www.jpl.nasa.gov/news/news.php?release=2012-289|title=First Planets Found Around Sun-Like Stars in a Cluster|website=[[Jet Propulsion Laboratory]] |access-date=September 14, 2012}}</ref>

In 2016 additional observations found a second planet in the [[Pr0211]] system, Pr0211 c. This made Pr0211 the first multi-planet system to be discovered in an open cluster.<ref name="Malavolta2016"/>

The [[Kepler space telescope]], in its [[Kepler space telescope#Second Light (K2)|K2 mission]], discovered planets around several more stars in the Beehive Cluster. The stars K2-95,<ref name="Obermeier2016"/> K2-100, K2-101, K2-102, K2-103, and K2-104<ref name="Mann2017"/> host a single planet each, and K2-264 has a two-planet system.<ref name="Rizzuto2018"/>