Exoplanet

K2-261 b

Orbiting K2-261

Overview

K2-261 b is an exoplanet orbiting the star K2-261, discovered in 2018 using the Transit method. It is a Neptune-sized world.

Key Measurements

Radius

9.27

Earth radii

015 R⊕

Mass

68.97

Earth masses

0500 M⊕

Orbital Period

11.6

days

0.1d10,000d

Distance

213.3

parsecs

Nearby10,000 pc

Equilibrium Temp

1036

K

150 K3,500 K

Radius (Earth radii)

9.27

Mass (Earth masses)

68.97

Measured

Equilibrium Temperature

1036 K

Parameter source: Thygesen et al. 2023

Orbital Period

11.633+0.000−0.000days

Semi-Major Axis

0.1086+0.0012−0.0012au

Planet Mass (Earth masses)

68.97+7.95−9.22

Planet Mass (Jupiter masses)

0.2170+0.0250−0.0290

Eccentricity

0.2740+0.0650−0.0610

Argument of Periastron

145.0+13.0−15.0deg

Radial Velocity Semi-Amplitude

17.40+1.90−2.30m/s

Distance from Earth

213.3 pc (~696 ly)

Spectral Type

Unknown

Temperature

5490 K

Mass (Solar)

1.11 M☉

Radius (Solar)

1.66 R☉

Luminosity

0.35 log L☉

Planets in System

1

Stars in System

1

Coordinates (RA, Dec)

163.0323°, 0.4932°

Discovery Method

Transit

Discovery Year

2018

Data Sources
NASA Exoplanet Archive

Source ID: K2-261 b

System Context

K2-261 b orbits K2-261 and was reported in 2018 and was detected with the Transit method.

Published measurements list a radius of 9.27 Earth radii, a mass of 68.97 Earth masses, an orbital period of 11.63 days, and an equilibrium temperature near 1,036 K.

Catalog data places the system at about 213.3 parsecs from Earth and 1 known planet in the system.

Host star

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

Open K2-261