Confirmed Exoplanet Discovered 2025

KMT-2024-BLG-2242L b

A sub-neptune orbiting the unknown KMT-2024-BLG-2242L, located approximately 24,853.1 light-years from Earth.

Key parameters at a glance

  • A radius of 3.82 Earth radii
  • A mass of 13.98 Earth masses
  • Surface gravity around 0.96 g
  • Semi-major axis 0.8900 AU
  • Distance from Earth 24,853.09 light-years
  • Earth Similarity Index 0.559
  • Travel time at Voyager 1 speed 438,284,168 years

KMT-2024-BLG-2242L b Planet Profile

Physical Specs

Radius
3.82 R⊕
Radius (Jupiter)
0.341 R♃
Mass
13.98 M⊕
Mass (Jupiter)
0.044 M♃
Density
1.38 g/cm³
Surface Gravity
0.96 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.559
HZ Position Unknown
Controversial No

Discovery

Year 2025
Method Microlensing
Facility KMTNet
Telescope 1.6 m wide-field telescope

Size rank in cohort

Rank by radius

#54of 1978

top 2.7%

This planet

3.82R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Metric Earth KMT-2024-BLG-2242L b Jupiter
Radius (R⊕)1.003.8211.21
Mass (M⊕)1.0013.98317.83
Density (g/cm³)5.511.381.33
Surface Gravity (g)1.000.962.53
Insolation (S⊕)1.000.037

Alternative Mass Estimates

Method Value Interpretation
Best measured mass 13.984 M⊕ Direct mass measurement (not derived).

Percentile among Sub-Neptune cohort

Radius 3.820 R⊕ · percentile 97 / cohort 1978
Mass 13.984 M⊕ · percentile 90 / cohort 1978
Distance 7,620.00 pc · percentile 100 / cohort 1975
ESI 0.559 · percentile 78 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period
days
Semi-major axis
0.8900 AU
Eccentricity
Inclination
°

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

 

Insolation (S⊕)

Earth = 1.00

Earth Similarity (ESI)

0.559

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Han et al. 2025

Instrument

18k Mosaic CCD camera

Publication

2025-10

Observation locale

Ground

Host System: KMT-2024-BLG-2242L

Spectral Class

Unknown

Effective Temperature

Estimated Age

Stellar Radius

Stellar Mass

0.069 M☉

Metallicity [Fe/H]

Distance
7,620.00 parsec
Light-years 24,853.09 ly
V-band magnitude
mag
Voyager-speed travel 438,284,168 yr

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