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KMT-2024-BLG-1209L b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/KMT-2024-BLG-1209L b

Confirmed exoplanet · Gas Giant

KMT-2024-BLG-1209L b

Orbiting KMT-2024-BLG-1209L

Discovered in 2025 using Microlensing. This page reflects the latest synchronized NASA Exoplanet Archive composite record.

NASA Archive record ↗Back to catalog →

Generic gas giant catalog artwork; not a direct image of KMT-2024-BLG-1209L b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,025
Method: Microlensing
Radius: 13.2 R⊕
Mass: 839.066994 M⊕
Orbit: Not reported by the NASA Exoplanet Archive
Distance: 3,930 pc

Planet profile

Orbit and physical properties

Orbital period: Not reported by the NASA Exoplanet Archive
Semi-major axis: 2.51 AU
Eccentricity: Not reported by the NASA Exoplanet Archive
Radius: 13.2 Earth radii
Mass: 839.066994 Earth masses
Mass provenance: Mass
Density: 2 g/cm³
Equilibrium temperature: Not reported by the NASA Exoplanet Archive
Insolation: Not reported by the NASA Exoplanet Archive

Host system

Star and system properties

Host star: KMT-2024-BLG-1209L
Stars in system: 1
Known planets in system: 1
Spectral type: K3 V
Stellar temperature: Not reported by the NASA Exoplanet Archive
Stellar radius: Not reported by the NASA Exoplanet Archive
Stellar mass: 0.77 M☉
Stellar metallicity: Not reported by the NASA Exoplanet Archive
Stellar age: Not reported by the NASA Exoplanet Archive
Distance: 3,930 parsecs
Right ascension: 17h26m27.11s
Declination: -28d07m14.02s

Discovery

Detection and provenance

Discovery method: Microlensing
Discovery year: 2,025
Publication date: 2025-07
Discovery locale: Ground
Facility: KMTNet
Telescope: 1.6 m wide-field telescope
Instrument: 18k Mosaic CCD camera
NASA Exoplanet Archive: Open composite record ↗

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