Key parameters at a glance

A radius of 9.86 Earth radii
A mass of 69.92 Earth masses
Surface gravity around 0.72 g
Semi-major axis 1.2600 AU
Distance from Earth 26,875.25 light-years
Earth Similarity Index 0.309
Travel time at Voyager 1 speed 473,945,085 years

1 sibling around KMT-2021-BLG-1077L

KMT-2021-BLG-1077L b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
KMT-2021-BLG-1077L b this	Neptune-like	9.86	69.92	—	—	2022
KMT-2021-BLG-1077L c	Gas Giant	10.60	79.46	—	—	2022

KMT-2021-BLG-1077L b Planet Profile

Physical Specs

Radius

9.86 R⊕

Radius (Jupiter)

0.880 R♃

Mass

69.92 M⊕

Mass (Jupiter)

0.220 M♃

Density

0.40 g/cm³

Surface Gravity

0.72 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.309

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

#14of 574

top 2.3%

This planet

9.86R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-5218 b 9.86 R⊕ KOI-134 c 9.86 R⊕ TOI-2416 b 9.86 R⊕

Metric	Earth	KMT-2021-BLG-1077L b	Jupiter
Radius (R⊕)	1.00	9.86	11.21
Mass (M⊕)	1.00	69.92	317.83
Density (g/cm³)	5.51	0.40	1.33
Surface Gravity (g)	1.00	0.72	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	69.922 M⊕	Direct mass measurement (not derived).

Percentile among Neptune-like cohort

Radius 9.860 R⊕ · percentile 97 / cohort 574

Mass 69.922 M⊕ · percentile 86 / cohort 574

Distance 8,240.00 pc · percentile 100 / cohort 572

ESI 0.309 · percentile 52 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

1.2600 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)

0.309

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Han et al. 2022

Instrument

18k Mosaic CCD camera

Publication

2022-06

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-1077L

Spectral Class

M-type red dwarf

Effective Temperature

—

Estimated Age

—

Stellar Radius

—

Stellar Mass

0.140 M☉

Metallicity [Fe/H]

—

Distance

8,240.00 parsec

Light-years 26,875.25 ly

V-band magnitude

— mag

Voyager-speed travel 473,945,085 yr