Key parameters at a glance
- A radius of 12.60 Earth radii
- A mass of 2,469.53 Earth masses
- Surface gravity around 15.56 g
- Semi-major axis 3.0500 AU
- Distance from Earth 20,221.67 light-years
- Earth Similarity Index 0.418
- Travel time at Voyager 1 speed 356,609,166 years
KMT-2025-BLG-0121L b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1179of 1771
top 66.5%
This planet
12.60R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | KMT-2025-BLG-0121L b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.60 | 11.21 |
| Mass (M⊕) | 1.00 | 2,469.53 | 317.83 |
| Density (g/cm³) | 5.51 | 6.78 | 1.33 |
| Surface Gravity (g) | 1.00 | 15.56 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 2,469.527 M⊕ | Direct mass measurement (not derived). |
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
Orbital period for this planet has not yet been measured.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.418
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Han et al. 2026Instrument
18k Mosaic CCD camera
Publication
2026-02
Observation locale
Ground
Discovery cohort
Planets confirmed in 2026 at KMTNet (12 shown).
Host System: KMT-2025-BLG-0121L
Spectral Class
Unknown
Effective Temperature
—
Estimated Age
—
Stellar Radius
—
Stellar Mass
0.610 M☉
Metallicity [Fe/H]
—
Similar Worlds
MOA-2012-BLG-006L b
Gas Giant · Unknown
Radius 12.60 R⊕ · 17,286.3 ly
KMT-2019-BLG-0371L b
Gas Giant · Unknown
Radius 12.60 R⊕ · 22,863.5 ly
SWEEPS-11 b
Gas Giant · Unknown
Radius 12.67 R⊕ · 27,723.3 ly
KMT-2017-BLG-2197L b
Gas Giant · Unknown
Radius 12.50 R⊕ · 25,440.2 ly
OGLE-2019-BLG-0249L b
Gas Giant · Unknown
Radius 12.70 R⊕ · 20,776.1 ly
OGLE-2019-BLG-0299L b
Gas Giant · Unknown
Radius 12.70 R⊕ · 19,014.9 ly