Exoplanet

KMT-2024-BLG-1209L b

Orbiting KMT-2024-BLG-1209L

Overview

KMT-2024-BLG-1209L b is an exoplanet orbiting the star KMT-2024-BLG-1209L, discovered in 2025 using the Microlensing method.

Key Measurements

Mass

839.07

Earth masses

0500 M⊕

Distance

3930.0

parsecs

Nearby10,000 pc

Radius (Earth radii)

Unknown

Mass (Earth masses)

839.07

Measured

Equilibrium Temperature

Unknown

Parameter source: Han et al. 2025

Semi-Major Axis

2.5100+1.5000−1.1000au

Planet Mass (Earth masses)

839.07+498.99−368.68

Planet Mass (Jupiter masses)

2.6400+1.5700−1.1600

Distance from Earth

3930.0 pc (~12818 ly)

Spectral Type

K3 V

Temperature

Unknown

Mass (Solar)

0.77 M☉

Radius (Solar)

Unknown

Luminosity

Unknown

Planets in System

1

Stars in System

1

Coordinates (RA, Dec)

261.6130°, -28.1206°

Discovery Method

Microlensing

Discovery Year

2025

Data Sources
NASA Exoplanet Archive

Source ID: KMT-2024-BLG-1209L b

System Context

KMT-2024-BLG-1209L b orbits KMT-2024-BLG-1209L and was reported in 2025 and was detected with the Microlensing method.

Published measurements list a mass of 839.07 Earth masses.

Catalog data places the system at about 3,930 parsecs from Earth, a host star classified as K3 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 KMT-2024-BLG-1209L