Proxima Centauri d

Proxima Centauri d
	Artistic depiction of Proxima Centauri d, with Proxima Centauri and Alpha Centauri A & B visible in the background
Discovery
Discovery site	VLT-ESPRESSO
Discovery date	2020
Detection method	Radial velocity
Orbital characteristics
Semi-major axis	0.02885+0.00019; −0.00022 AU
Eccentricity	0.04+0.15; −0.04
Orbital period (sidereal)	5.122+0.002; −0.0036 d
Semi-amplitude	0.39±0.07 m/s
Star	Proxima Centauri
Physical characteristics
Mean radius	~0.81±0.08 R🜨 (predicted)
Mass	≥0.26±0.05 M🜨
Temperature	360 K (87 °C; 188 °F)

Proxima Centauri d (also called Proxima d) is a candidate^[2]^[1] exoplanet orbiting the red dwarf star Proxima Centauri, the closest star to the Sun and part of the Alpha Centauri triple star system. Together with two other planets^[a] in the Proxima Centauri system, it is the closest known exoplanet to the Solar System, located approximately 4.2 light-years (1.3 parsecs; 40 trillion kilometres; 25 trillion miles) away in the constellation of Centaurus. The first signs of the exoplanet emerged as a weak 5.15-day signal in radial velocity data taken from the Very Large Telescope during a 2020 study on Proxima b's mass. This signal was formally proposed to be a candidate exoplanet by Faria et al. in a follow-up paper published in February 2022.^[4]^[1]

^ ^a ^b ^c ^d ^e Cite error: The named reference Faria2022 was invoked but never defined (see the help page).
^ Cite error: The named reference Exoplanet-Archive was invoked but never defined (see the help page).
^ Cite error: The named reference Artigau2022 was invoked but never defined (see the help page).
^ Cite error: The named reference SuarezMascareno2020 was invoked but never defined (see the help page).

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[Faria2022-1] Cite error: The named reference Faria2022 was invoked but never defined (see the help page).

[Exoplanet-Archive-2] Cite error: The named reference Exoplanet-Archive was invoked but never defined (see the help page).

[Artigau2022-3] Cite error: The named reference Artigau2022 was invoked but never defined (see the help page).

[SuarezMascareno2020-5] Cite error: The named reference SuarezMascareno2020 was invoked but never defined (see the help page).

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