Exoplanet

KELT-9 b

Orbiting KELT-9

Overview

KELT-9 b is an exoplanet orbiting the star KELT-9, discovered in 2017 using the Transit method. It is a Jupiter-sized world.

Key Measurements

Radius

21.70

Earth radii

015 R⊕

Mass

915.35

Earth masses

0500 M⊕

Orbital Period

1.5

days

0.1d10,000d

Distance

204.5

parsecs

Nearby10,000 pc

Equilibrium Temp

3921

K

150 K3,500 K

Radius (Earth radii)

21.70

Mass (Earth masses)

915.35

Measured

Equilibrium Temperature

3921 K

Parameter source: Borsa et al. 2019

Orbital Period

1.481+0.000−0.000days

Semi-Major Axis

0.0337+0.0008−0.0008au

Planet Mass (Earth masses)

915.35+111.24−111.24

Planet Mass (Jupiter masses)

2.8800+0.3500−0.3500

Eccentricity

0.0000

Radial Velocity Semi-Amplitude

293.00+32.00−32.00m/s

Distance from Earth

204.5 pc (~667 ly)

Spectral Type

A

Temperature

9270 K

Mass (Solar)

2.32 M☉

Radius (Solar)

2.42 R☉

Luminosity

1.59 log L☉

Planets in System

1

Stars in System

2

Coordinates (RA, Dec)

307.8599°, 39.9389°

Discovery Method

Transit

Discovery Year

2017

Data Sources
NASA Exoplanet Archive

Source ID: KELT-9 b

System Context

KELT-9 b orbits KELT-9 and was reported in 2017 and was detected with the Transit method.

Published measurements list a radius of 21.7 Earth radii, a mass of 915.35 Earth masses, an orbital period of 1.48 days, and an equilibrium temperature near 3,921 K.

Catalog data places the system at about 204.5 parsecs from Earth, a host star classified as A, 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-9