Exoplanet

KELT-21 b

Orbiting KELT-21

Overview

KELT-21 b is an exoplanet orbiting the star KELT-21, discovered in 2018 using the Transit method. It is a Jupiter-sized world.

Key Measurements

Radius

17.78

Earth radii

015 R⊕

Mass

1242.72

Earth masses

0500 M⊕

Orbital Period

3.6

days

0.1d10,000d

Distance

470.9

parsecs

Nearby10,000 pc

Equilibrium Temp

2051

K

150 K3,500 K

Radius (Earth radii)

17.78

Mass (Earth masses)

1242.72

Measured

Equilibrium Temperature

2051 K

Parameter source: Johnson et al. 2018

Orbital Period

3.613+0.000−0.000days

Semi-Major Axis

0.0522+0.0003−0.0003au

Planet Mass (Earth masses)

1242.72

Planet Mass (Jupiter masses)

3.9100

Eccentricity

0.0000

Radial Velocity Semi-Amplitude

<399.6m/s

Distance from Earth

470.9 pc (~1536 ly)

Spectral Type

A8 V

Temperature

7598 K

Mass (Solar)

1.46 M☉

Radius (Solar)

1.64 R☉

Luminosity

0.90 log L☉

Planets in System

1

Stars in System

1

Coordinates (RA, Dec)

304.8000°, 32.5810°

Discovery Method

Transit

Discovery Year

2018

Data Sources
NASA Exoplanet Archive

Source ID: KELT-21 b

System Context

KELT-21 b orbits KELT-21 and was reported in 2018 and was detected with the Transit method.

Published measurements list a radius of 17.78 Earth radii, a mass of 1,242.72 Earth masses, an orbital period of 3.61 days, and an equilibrium temperature near 2,051 K.

Catalog data places the system at about 470.9 parsecs from Earth, a host star classified as A8 V, 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 KELT-21