Key parameters at a glance

A radius of 12.40 Earth radii
A mass of 3,368.98 Earth masses
Surface gravity around 21.91 g
Semi-major axis 690.0000 AU
Distance from Earth 517.34 light-years
Earth Similarity Index 0.374
Travel time at Voyager 1 speed 9,123,328 years

KOINTREAU-1 b Planet Profile

Physical Specs

Radius

12.40 R⊕

Radius (Jupiter)

1.110 R♃

Mass

3,368.98 M⊕

Mass (Jupiter)

10.600 M♃

Density

9.71 g/cm³

Surface Gravity

21.91 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.374

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

#1298of 1771

top 73.2%

This planet

12.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 110014 b 12.40 R⊕ CFBDSIR J145829+101343 b 12.40 R⊕ MOA-2010-BLG-073L b 12.40 R⊕

Metric	Earth	KOINTREAU-1 b	Jupiter
Radius (R⊕)	1.00	12.40	11.21
Mass (M⊕)	1.00	3,368.98	317.83
Density (g/cm³)	5.51	9.71	1.33
Surface Gravity (g)	1.00	21.91	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	3,368.981 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 61229372

Gaia DR2

Gaia DR2 145196252820109440

Gaia DR3

Gaia DR3 145196252820109440

System

XEST 17-036

Percentile among Gas Giant cohort

Radius 12.400 R⊕ · percentile 25 / cohort 1771

Mass 3,368.981 M⊕ · percentile 89 / cohort 1747

Distance 158.62 pc · percentile 45 / cohort 1759

ESI 0.374 · percentile 77 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

690.0000 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)

0.374

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Walker et al. 2026

Instrument

NIRC2 Camera

Publication

2026-02

Observation locale

Ground

Discovery cohort

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

KOINTREAU-3 b · Gas Giant KOINTREAU-4 b · Gas Giant

Host System: XEST 17-036

Spectral Class

M-type red dwarf

Effective Temperature

3,551 K — cooler than the Sun (5,778 K)

Estimated Age

0.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

—

Stellar Mass

0.260 M☉

Metallicity [Fe/H]

-0.15

Extended Stellar Properties

Surface gravity (log g)

3.440 dex

Rotational v·sin i

7.70 km/s

Metallicity ratio

[Fe/H]

Distance

158.62 parsec

Light-years 517.34 ly

V-band magnitude

— mag

Voyager-speed travel 9,123,328 yr

Multi-band Host Photometry — 10 bands

Astrometric Data

Parallax

6.283 mas

Total Proper Motion

18.836 mas/yr

PM Right Ascension

8.62 mas/yr

PM Declination

-16.75 mas/yr

Galactic Cartesian (pc)

x = 0.340 · y = 0.857 · z = 0.387

Equatorial (J2000)

RA 68.35929° · Dec 22.75806°

Galactic ℓ, b

175.465° · -16.766°

Ecliptic λ, β

70.113° · 0.800°

HTM-20 index

-1218743260

Similar Worlds

DE CVn b

Gas Giant · M-type red dwarf

Radius 12.40 R⊕ · 99.6 ly

2MASS J0249-0557 c

Gas Giant · M-type red dwarf

Radius 12.40 R⊕ · 215.5 ly

2MASS J21252752-8138278 b

Gas Giant · M-type red dwarf

Radius 12.40 R⊕ · 111.3 ly

COCONUTS-2 b

Gas Giant · M-type red dwarf

Radius 12.44 R⊕ · 35.5 ly

USco CTIO 108 b

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 469.7 ly

USco1556 b

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 458.7 ly

Explore Related Categories

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