Key parameters at a glance

A radius of 3.35 Earth radii
A mass of 11.20 Earth masses
Surface gravity around 1.00 g
Semi-major axis 3.5000 AU
Distance from Earth 15,003.18 light-years
Earth Similarity Index 0.603
Travel time at Voyager 1 speed 264,580,994 years

KMT-2021-BLG-0171L b Planet Profile

Physical Specs

Radius

3.35 R⊕

Radius (Jupiter)

0.299 R♃

Mass

11.20 M⊕

Mass (Jupiter)

0.035 M♃

Density

1.64 g/cm³

Surface Gravity

1.00 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.603

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

#250of 1978

top 12.6%

This planet

3.35R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1451 b 3.35 R⊕ HD 103949 b 3.35 R⊕ Kepler-609 b 3.35 R⊕

Metric	Earth	KMT-2021-BLG-0171L b	Jupiter
Radius (R⊕)	1.00	3.35	11.21
Mass (M⊕)	1.00	11.20	317.83
Density (g/cm³)	5.51	1.64	1.33
Surface Gravity (g)	1.00	1.00	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	11.200 M⊕	Direct mass measurement (not derived).

Percentile among Sub-Neptune cohort

Radius 3.350 R⊕ · percentile 87 / cohort 1978

Mass 11.200 M⊕ · percentile 81 / cohort 1978

Distance 4,600.00 pc · percentile 99 / cohort 1975

ESI 0.603 · percentile 83 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

3.5000 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)

0.603

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-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-2021-BLG-0171L

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,200 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

—

Stellar Mass

0.780 M☉

Metallicity [Fe/H]

—

Distance

4,600.00 parsec

Light-years 15,003.18 ly

V-band magnitude

— mag

Voyager-speed travel 264,580,994 yr