Confirmed Exoplanet Discovered 2026

KMT-2020-BLG-0202L b

A gas giant orbiting the unknown KMT-2020-BLG-0202L, located approximately 12,524.4 light-years from Earth.

Key parameters at a glance

  • A radius of 12.40 Earth radii
  • A mass of 3,902.93 Earth masses
  • Surface gravity around 25.38 g
  • Semi-major axis 4.1700 AU
  • Distance from Earth 12,524.39 light-years
  • Earth Similarity Index 0.356
  • Travel time at Voyager 1 speed 220,867,612 years

KMT-2020-BLG-0202L b Planet Profile

Physical Specs

Radius
12.40 R⊕
Radius (Jupiter)
1.100 R♃
Mass
3,902.93 M⊕
Mass (Jupiter)
12.280 M♃
Density
11.20 g/cm³
Surface Gravity
25.38 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.356
HZ Position Unknown
Controversial No

Discovery

Year 2026
Method Microlensing
Facility KMTNet
Telescope 1.6 m wide-field telescope

Size rank in cohort

Rank by radius

#1298of 1771

top 73.2%

This planet

12.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

Metric Earth KMT-2020-BLG-0202L b Jupiter
Radius (R⊕)1.0012.4011.21
Mass (M⊕)1.003,902.93317.83
Density (g/cm³)5.5111.201.33
Surface Gravity (g)1.0025.382.53
Insolation (S⊕)1.000.037

Alternative Mass Estimates

Method Value Interpretation
Best measured mass 3,902.933 M⊕ Direct mass measurement (not derived).

Percentile among Gas Giant cohort

Radius 12.400 R⊕ · percentile 25 / cohort 1771
Mass 3,902.933 M⊕ · percentile 91 / cohort 1747
Distance 3,840.00 pc · percentile 92 / cohort 1759
ESI 0.356 · percentile 73 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period
days
Semi-major axis
4.1700 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)

0.356

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Han et al. 2026

Instrument

18k Mosaic CCD camera

Publication

2026-02

Observation locale

Ground

Host System: KMT-2020-BLG-0202L

Spectral Class

Unknown

Effective Temperature

Estimated Age

Stellar Radius

Stellar Mass

0.810 M☉

Metallicity [Fe/H]

Distance
3,840.00 parsec
Light-years 12,524.39 ly
V-band magnitude
mag
Voyager-speed travel 220,867,612 yr

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