Key parameters at a glance
- A radius of 4.59 Earth radii
- A mass of 19.07 Earth masses
- Surface gravity around 0.91 g
- Semi-major axis 1.9600 AU
- Distance from Earth 23,418.00 light-years
- Earth Similarity Index 0.501
- Travel time at Voyager 1 speed 412,976,421 years
KMT-2024-BLG-1281L b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#449of 574
top 78.0%
This planet
4.59R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | KMT-2024-BLG-1281L b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.59 | 11.21 |
| Mass (M⊕) | 1.00 | 19.07 | 317.83 |
| Density (g/cm³) | 5.51 | 1.08 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.91 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 19.070 M⊕ | Direct mass measurement (not derived). |
Percentile among Neptune-like 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)
0.501
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Han et al. 2025Instrument
18k Mosaic CCD camera
Publication
2025-10
Observation locale
Ground
Discovery cohort
Planets confirmed in 2025 at KMTNet (12 shown).
Host System: KMT-2024-BLG-1281L
Spectral Class
Unknown
Effective Temperature
—
Estimated Age
—
Stellar Radius
—
Stellar Mass
0.320 M☉
Metallicity [Fe/H]
—
Similar Worlds
KMT-2021-BLG-1253L b
Neptune-like · Unknown
Radius 4.59 R⊕ · 21,656.8 ly
OGLE-2007-BLG-368L b
Neptune-like · Unknown
Radius 4.72 R⊕ · 19,243.2 ly
OGLE-2018-BLG-0516L b
Neptune-like · Unknown
Radius 4.73 R⊕ · 22,830.9 ly
MOA-2011-BLG-291L b
Neptune-like · Unknown
Radius 4.43 R⊕ · 14,350.9 ly
OGLE-2015-BLG-1670L b
Neptune-like · Unknown
Radius 4.42 R⊕ · 21,852.5 ly
KMT-2023-BLG-0830L b
Neptune-like · Unknown
Radius 4.41 R⊕ · 23,646.3 ly