Exoplanet

Proxima Cen b

Orbiting Proxima Cen

Overview

Proxima Cen b is an exoplanet orbiting the star Proxima Cen, discovered in 2016 using the Radial Velocity method.

Key Measurements

Minimum Mass (M sin i)

1.05

Earth masses

0500 M⊕

Orbital Period

11.2

days

0.1d10,000d

Distance

1.3

parsecs

Nearby10,000 pc

Equilibrium Temp

218

K

150 K3,500 K

Radius (Earth radii)

Unknown

Minimum Mass, M sin(i) (Earth masses)

1.05

Radial-velocity minimum

Equilibrium Temperature

218 K

Parameter source: Suárez Mascareño et al. 2025

Orbital Period

11.185+0.001−0.001days

Semi-Major Axis

0.0485+0.0003−0.0003au

M sin(i) (Earth masses)

1.05+0.06−0.06

M sin(i) (Jupiter masses)

0.0033+0.0002−0.0002

Eccentricity

0.0000

Epoch of Periastron

2460548.59+0.12−0.12days(JD)

Radial Velocity Semi-Amplitude

1.23+0.06−0.06m/s

Distance from Earth

1.3 pc (~4 ly)

Spectral Type

M5.5 V

Temperature

2900 K

Mass (Solar)

0.12 M☉

Radius (Solar)

0.14 R☉

Luminosity

-2.82 log L☉

Planets in System

2

Stars in System

3

Coordinates (RA, Dec)

217.3935°, -62.6762°

Discovery Method

Radial Velocity

Discovery Year

2016

Data Sources
NASA Exoplanet Archive

Source ID: Proxima Cen b

System Context

Proxima Cen b orbits Proxima Cen and was reported in 2016 and was detected with the Radial Velocity method.

Published measurements list a minimum mass of 1.06 Earth masses (M sin i), an orbital period of 11.18 days, and an equilibrium temperature near 218 K.

Catalog data places the system at about 1.3 parsecs from Earth, a host star classified as M5.5 V, and 2 known planets in the system.

Host star

Explore the stellar record for this system to compare temperature, spectral type, and known planets.

Open Proxima Cen

More planets in this system

Proxima Cen d