Key parameters at a glance

A radius of 13.10 Earth radii
A mass of 1,080.62 Earth masses
Surface gravity around 6.30 g
Semi-major axis 342.0000 AU
Distance from Earth 458.45 light-years
Earth Similarity Index 0.405
Travel time at Voyager 1 speed 8,084,847 years

KOINTREAU-3 b Planet Profile

Physical Specs

Radius

13.10 R⊕

Radius (Jupiter)

1.170 R♃

Mass

1,080.62 M⊕

Mass (Jupiter)

3.400 M♃

Density

2.64 g/cm³

Surface Gravity

6.30 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.405

HZ Position Unknown

Controversial No

Discovery

Year 2026

Method Imaging

Facility W. M. Keck Observatory

Telescope 10 m Keck II Telescope

Size rank in cohort

Rank by radius

#910of 1771

top 51.3%

This planet

13.10R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

GJ 3021 b 13.10 R⊕ HD 221287 b 13.10 R⊕ HD 37605 c 13.10 R⊕

Metric	Earth	KOINTREAU-3 b	Jupiter
Radius (R⊕)	1.00	13.10	11.21
Mass (M⊕)	1.00	1,080.62	317.83
Density (g/cm³)	5.51	2.64	1.33
Surface Gravity (g)	1.00	6.30	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,080.617 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 175629533

Gaia DR2

Gaia DR2 6049072213596652288

Gaia DR3

Gaia DR3 6049072213596652288

System

ISO-Oph 96

Percentile among Gas Giant cohort

Radius 13.100 R⊕ · percentile 46 / cohort 1771

Mass 1,080.617 M⊕ · percentile 68 / cohort 1747

Distance 140.56 pc · percentile 43 / cohort 1759

ESI 0.405 · percentile 87 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

342.0000 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)

0.405

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Walker et al. 2026

Instrument

NIRC2 Camera

Publication

2026-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2026 at W. M. Keck Observatory (2 shown).

KOINTREAU-1 b · Gas Giant KOINTREAU-4 b · Gas Giant

Host System: ISO-Oph 96

Spectral Class

K-type orange

Effective Temperature

3,920 K — cooler than the Sun (5,778 K)

Estimated Age

0.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.731 R☉

Stellar Mass

0.410 M☉

Metallicity [Fe/H]

-0.05

Extended Stellar Properties

Surface gravity (log g)

4.400 dex

Stellar density

1.481 g/cm³

Rotational v·sin i

16.90 km/s

Metallicity ratio

[Fe/H]

Distance

140.56 parsec

Light-years 458.45 ly

V-band magnitude

— mag

Voyager-speed travel 8,084,847 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

7.088 mas

Total Proper Motion

25.600 mas/yr

PM Right Ascension

-6.09 mas/yr

PM Declination

-24.87 mas/yr

Galactic Cartesian (pc)

x = -0.358 · y = -0.835 · z = -0.418

Equatorial (J2000)

RA 246.76878° · Dec -24.71668°

Galactic ℓ, b

352.924° · 16.593°

Ecliptic λ, β

248.971° · -2.957°

HTM-20 index

-772066253

Similar Worlds

HD 4732 c

Gas Giant · K-type orange

Radius 13.10 R⊕ · 178.7 ly

HD 37605 c

Gas Giant · K-type orange

Radius 13.10 R⊕ · 152.6 ly

HD 102843 b

Gas Giant · K-type orange

Radius 13.10 R⊕ · 204.7 ly

HD 142245 b

Gas Giant · K-type orange

Radius 13.10 R⊕ · 317.1 ly

HD 112570 b

Gas Giant · K-type orange

Radius 13.10 R⊕ · 330.0 ly

HD 69123 b

Gas Giant · K-type orange

Radius 13.10 R⊕ · 245.0 ly

Explore Related Categories

Gas Giant Planets Imaging Discoveries W. M. Keck Observatory Mission K-type orange Hosts