Key parameters at a glance

A radius of 0.88 Earth radii
A mass of 4.00 Earth masses
Surface gravity around 5.17 g
An orbital period of 7.577 days
Equilibrium temperature 629 K (356 °C)
Distance from Earth 34.10 light-years
Earth Similarity Index 0.375
Travel time at Voyager 1 speed 601,289 years
Almost certainly tidally locked to its host star given the close orbit

GJ 341 b Planet Profile

Physical Specs

Radius

0.88 R⊕

Radius (Jupiter)

0.079 R♃

Mass

4.00 M⊕

Mass (Jupiter)

0.013 M♃

Density

— g/cm³

Surface Gravity

5.17 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.375

HZ Position Inner

Controversial No

Discovery

Year 2025

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#430of 570

top 75.3%

This planet

0.88R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1416 b 0.88 R⊕ Kepler-362 b 0.88 R⊕ Kepler-398 d 0.88 R⊕

Metric	Earth	GJ 341 b	Jupiter
Radius (R⊕)	1.00	0.88	11.21
Mass (M⊕)	1.00	4.00	317.83
Density (g/cm³)	5.51	—	1.33
Surface Gravity (g)	1.00	5.17	2.53
Insolation (S⊕)	1.00	13.80	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	4.000 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 304636

HIP

HIP 45908

TIC

TIC 359271092

Gaia DR2

Gaia DR2 5299440441521812992

Gaia DR3

Gaia DR3 5299440441521812992

System

GJ 341

Percentile among Rocky Terrestrial cohort

Radius 0.880 R⊕ · percentile 24 / cohort 570

Mass 4.000 M⊕ · percentile 94 / cohort 570

Orbital period 7.58 d · percentile 70 / cohort 567

Distance 10.45 pc · percentile 5 / cohort 566

ESI 0.375 · percentile 55 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

7.577 days

Semi-major axis

— AU

Eccentricity

0.000

Inclination

89.24 °

Year Length

A year here lasts approximately 7.58 Earth days (2.1% of a terrestrial year) on a nearly circular orbit.

Transit Fingerprint

Depth

0.029 %

Duration

2.230 h

Rp / R★

0.016000

Transit midpoint (BJD)

2,459,301.7710

Photometric dip

Transit produces a flux drop of 289 ppm lasting ≈ 2.23 h.

Eq. Temperature

629K

(356 °C)

Insolation (S⊕)

13.80

Earth = 1.00

Earth Similarity (ESI)

0.375

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Ditomasso et al. 2025

Instrument

TESS CCD Array

Publication

2025-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-1266 d · Super-Earth TOI-2267 c · Rocky Terrestrial TOI-5799 c · Super-Earth TOI-5728 b · Super-Earth TOI-5716 b · Rocky Terrestrial TOI-7166 b · Sub-Neptune TOI-2267 b · Rocky Terrestrial TOI-2093 c · Sub-Neptune TOI-2267 d · Super-Earth TOI-5489 c · Super-Earth TOI-1743 b · Super-Earth TOI-4364 b · Sub-Neptune

Host System: GJ 341

Spectral Class

M-type red dwarf

Effective Temperature

3,770 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.507 R☉

Stellar Mass

0.480 M☉

Metallicity [Fe/H]

-0.16

Extended Stellar Properties

Surface gravity (log g)

4.720 dex

Stellar density

5.082 g/cm³

Rotational v·sin i

2.32 km/s

Metallicity ratio

[Fe/H]

Distance

10.45 parsec

Light-years 34.10 ly

V-band magnitude

9.49 mag

Voyager-speed travel 601,289 yr

Multi-band Host Photometry — 8 bands

Astrometric Data

Parallax

95.628 mas

Total Proper Motion

859.621 mas/yr

PM Right Ascension

-840.11 mas/yr

PM Declination

182.09 mas/yr

Galactic Cartesian (pc)

x = -0.382 · y = 0.316 · z = -0.868

Equatorial (J2000)

RA 140.39938° · Dec -60.28117°

Galactic ℓ, b

279.584° · -7.306°

Ecliptic λ, β

188.268° · -67.295°

HTM-20 index

1958908433