Confirmed Exoplanet Discovered 2022

KMT-2018-BLG-1988L b

A sub-neptune orbiting the unknown KMT-2018-BLG-1988L, located approximately 13,535.5 light-years from Earth.

Key parameters at a glance

  • A radius of 2.22 Earth radii
  • A mass of 5.56 Earth masses
  • Surface gravity around 1.13 g
  • Semi-major axis 3.0900 AU
  • Distance from Earth 13,535.47 light-years
  • Earth Similarity Index 0.747
  • Travel time at Voyager 1 speed 238,698,071 years

KMT-2018-BLG-1988L b Planet Profile

Physical Specs

Radius
2.22 R⊕
Radius (Jupiter)
0.198 R♃
Mass
5.56 M⊕
Mass (Jupiter)
0.017 M♃
Density
2.79 g/cm³
Surface Gravity
1.13 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.747
HZ Position Unknown
Controversial No

Discovery

Year 2022
Method Microlensing
Facility KMTNet
Telescope 1.6 m wide-field telescope

Size rank in cohort

Rank by radius

#1642of 1978

top 83.0%

This planet

2.22R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1151 b 2.22 R⊕ Kepler-938 b 2.22 R⊕ Kepler-1432 b 2.22 R⊕
Metric Earth KMT-2018-BLG-1988L b Jupiter
Radius (R⊕)1.002.2211.21
Mass (M⊕)1.005.56317.83
Density (g/cm³)5.512.791.33
Surface Gravity (g)1.001.132.53
Insolation (S⊕)1.00—0.037

Alternative Mass Estimates

Method Value Interpretation
Best measured mass 5.560 M⊕ Direct mass measurement (not derived).

Percentile among Sub-Neptune cohort

Radius 2.220 R⊕ · percentile 17 / cohort 1978
Mass 5.560 M⊕ · percentile 17 / cohort 1978
Distance 4,150.00 pc · percentile 99 / cohort 1975
ESI 0.747 · percentile 97 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period
— days
Semi-major axis
3.0900 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)

0.747

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Han et al. 2022

Instrument

18k Mosaic CCD camera

Publication

2022-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2022 at KMTNet (12 shown).

KMT-2021-BLG-0912L b · Super-Earth KMT-2021-BLG-1391L b · Super-Earth KMT-2019-BLG-0253L b · Sub-Neptune KMT-2021-BLG-0171L b · Sub-Neptune KMT-2019-BLG-0953L b · Neptune-like OGLE-2018-BLG-1126L b · Neptune-like KMT-2021-BLG-1253L b · Neptune-like KMT-2021-BLG-2294L b · Neptune-like KMT-2021-BLG-0119L b · Gas Giant KMT-2019-BLG-0414L b · Gas Giant KMT-2019-BLG-1552L b · Gas Giant KMT-2021-BLG-0320L b · Neptune-like

Host System: KMT-2018-BLG-1988L

Spectral Class

Unknown

Effective Temperature

—

Estimated Age

—

Stellar Radius

—

Stellar Mass

0.470 M☉

Metallicity [Fe/H]

—

Distance
4,150.00 parsec
Light-years 13,535.47 ly
V-band magnitude
— mag
Voyager-speed travel 238,698,071 yr

Similar Worlds

OGLE-2005-BLG-390L b

Sub-Neptune · Unknown

Radius 2.21 R⊕ · 21,526.3 ly

KMT-2017-BLG-0428L b

Sub-Neptune · Unknown

Radius 2.23 R⊕ · 17,612.4 ly

OGLE-2017-BLG-1806L b

Sub-Neptune · Unknown

Radius 2.15 R⊕ · 20,874.0 ly

KMT-2017-BLG-1003L b

Sub-Neptune · Unknown

Radius 2.13 R⊕ · 23,124.5 ly

KMT-2018-BLG-1025L b

Sub-Neptune · Unknown

Radius 2.34 R⊕ · 21,868.8 ly

OGLE-2018-BLG-0532L b

Sub-Neptune · Unknown

Radius 2.37 R⊕ · 2,521.2 ly

Explore Related Categories

Sub-Neptune Planets Microlensing Discoveries KMTNet Mission