Editing Proxima Centauri (section)

===Planet c===
{{main|Proxima Centauri c}}

Proxima Centauri&nbsp;c is a candidate [[super-Earth]] or [[gas dwarf]] about {{nobr|7 {{Earth mass}}}} orbiting at roughly {{convert|1.5|AU|km}} every {{convert|1900|days|years}}.<ref name=SA-20190412/> If Proxima Centauri&nbsp;b were the star's Earth, Proxima Centauri&nbsp;c would be equivalent to Neptune. Due to its large distance from Proxima Centauri, it is unlikely to be habitable, with a low equilibrium temperature of around 39&nbsp;K.<ref name=ProximaC/> The planet was first reported by Italian astrophysicist Mario Damasso and his colleagues in April&nbsp;2019.<ref name=ProximaC>
{{cite news
 |first=Mike |last=Wall
 |date=12 April 2019
 |title=Possible 2nd&nbsp;planet spotted around Proxima Centauri
 |website=Space.com
 |url=https://www.space.com/proxima-centauri-possible-second-exoplanet.html
 |access-date=12 April 2019
}}
</ref><ref name=SA-20190412>
{{cite news
 |first=Lee |last=Billings
 |date=12 April 2019
 |title=A second planet may orbit Earth's nearest neighboring star
 |magazine=[[Scientific American]]
 |url=https://www.scientificamerican.com/article/a-second-planet-may-orbit-earths-nearest-neighboring-star/
 |access-date=12 April 2019
}}
</ref>
Damasso's team had noticed minor movements of Proxima Centauri in the [[Methods of detecting exoplanets#Radial velocity|radial velocity]] data from the ESO's HARPS instrument, indicating a possible additional planet orbiting Proxima Centauri.<ref name=ProximaC/> In 2020, the planet's existence was confirmed by Hubble [[astrometry]] data from {{Circa|1995}}.<ref name=McDonald>
{{cite press release
 |last=Benedict |first=Fritz
 |date=2 June 2020
 |title=Texas astronomer uses 25&nbsp;year-old Hubble data to confirm [lanet Proxima Centauri&nbsp;c
 |series=[[McDonald Observatory]]
 |publisher=[[University of Texas]]
 |url=https://mcdonaldobservatory.org/news/releases/20200602
}}
</ref>
A possible direct imaging counterpart was detected in the infrared with the [[Spectro-Polarimetric High-Contrast Exoplanet Research|SPHERE]], but the authors admit that they "did not obtain a clear detection." If their candidate source is in fact Proxima Centauri&nbsp;c, it is too bright for a planet of its mass and age, implying that the planet may have a [[ring system]] with a radius of around {{nobr|5 {{Jupiter radius|link=y}}.<ref name=Gratton2020/>}} However, {{harvp|Artigau|Cadieux|Cook|Doyon|Vandal|2022}} disputed the radial velocity confirmation of the planet.<ref name=ArtigauCadieux2022/>