Confirmed Exoplanet Discovered 2022

KMT-2021-BLG-1689L b

A neptune-like orbiting the k-type orange KMT-2021-BLG-1689L, located approximately 23,483.2 light-years from Earth.

Key parameters at a glance

  • A radius of 7.71 Earth radii
  • A mass of 46.00 Earth masses
  • Surface gravity around 0.77 g
  • Semi-major axis 2.5000 AU
  • Distance from Earth 23,483.23 light-years
  • Earth Similarity Index 0.363
  • Travel time at Voyager 1 speed 414,126,773 years

KMT-2021-BLG-1689L b Planet Profile

Physical Specs

Radius
7.71 R⊕
Radius (Jupiter)
0.688 R♃
Mass
46.00 M⊕
Mass (Jupiter)
0.145 M♃
Density
0.55 g/cm³
Surface Gravity
0.77 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.363
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

#166of 574

top 28.7%

This planet

7.71R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

MOA-2020-BLG-208L b 7.71 R⊕ KOI-351 g 7.72 R⊕ Kepler-489 b 7.72 R⊕
Metric Earth KMT-2021-BLG-1689L b Jupiter
Radius (R⊕)1.007.7111.21
Mass (M⊕)1.0046.00317.83
Density (g/cm³)5.510.551.33
Surface Gravity (g)1.000.772.53
Insolation (S⊕)1.00—0.037

Alternative Mass Estimates

Method Value Interpretation
Best measured mass 46.000 M⊕ Direct mass measurement (not derived).

Percentile among Neptune-like cohort

Radius 7.710 R⊕ · percentile 71 / cohort 574
Mass 46.000 M⊕ · percentile 68 / cohort 574
Distance 7,200.00 pc · percentile 97 / cohort 572
ESI 0.363 · percentile 66 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period
— days
Semi-major axis
2.5000 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)

0.363

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Yang et al. 2022

Instrument

18k Mosaic CCD camera

Publication

2022-07

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-2018-BLG-1988L b · Sub-Neptune 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

Host System: KMT-2021-BLG-1689L

Spectral Class

K-type orange

Effective Temperature

4,570 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

—

Stellar Mass

0.580 M☉

Metallicity [Fe/H]

—

Distance
7,200.00 parsec
Light-years 23,483.23 ly
V-band magnitude
— mag
Voyager-speed travel 414,126,773 yr

Similar Worlds

Kepler-489 b

Neptune-like · K-type orange

Radius 7.72 R⊕ · 1,205.6 ly

HD 177830 c

Neptune-like · K-type orange

Radius 7.87 R⊕ · 204.7 ly

TOI-1823 b

Neptune-like · K-type orange

Radius 7.54 R⊕ · 233.7 ly

TOI-216.02

Neptune-like · K-type orange

Radius 8.00 R⊕ · 580.4 ly

HATS-72 b

Neptune-like · K-type orange

Radius 8.10 R⊕ · 416.1 ly

TOI-2134 c

Neptune-like · K-type orange

Radius 7.27 R⊕ · 73.8 ly

Explore Related Categories

Neptune-like Planets Microlensing Discoveries KMTNet Mission K-type orange Hosts