Key parameters at a glance
- A radius of 4.43 Earth radii
- A mass of 18.00 Earth masses
- Surface gravity around 0.92 g
- Semi-major axis 0.6900 AU
- Distance from Earth 14,350.86 light-years
- Earth Similarity Index 0.513
- Travel time at Voyager 1 speed 253,077,473 years
MOA-2011-BLG-291L b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#468of 574
top 81.4%
This planet
4.43R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | MOA-2011-BLG-291L b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.43 | 11.21 |
| Mass (M⊕) | 1.00 | 18.00 | 317.83 |
| Density (g/cm³) | 5.51 | 1.14 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.92 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 18.000 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)
0.513
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Bennett et al. 2018Instrument
MOA CCD Array
Publication
2018-09
Observation locale
Ground
Discovery cohort
Planets confirmed in 2018 at MOA (3 shown).
Host System: MOA-2011-BLG-291L
Spectral Class
Unknown
Effective Temperature
—
Estimated Age
—
Stellar Radius
—
Stellar Mass
0.150 M☉
Metallicity [Fe/H]
—
Similar Worlds
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
OGLE-2018-BLG-1126L b
Neptune-like · Unknown
Radius 4.41 R⊕ · 18,590.9 ly
MOA-2011-BLG-262L b
Neptune-like · Unknown
Radius 4.29 R⊕ · 23,483.2 ly
KMT-2021-BLG-1253L b
Neptune-like · Unknown
Radius 4.59 R⊕ · 21,656.8 ly
KMT-2024-BLG-1281L b
Neptune-like · Unknown
Radius 4.59 R⊕ · 23,418.0 ly