Key parameters at a glance

A radius of 0.70 Earth radii
A mass of 0.63 Earth masses
Surface gravity around 1.30 g
An orbital period of 0.322 days
Semi-major axis 0.0071 AU
Equilibrium temperature 1,365 K (1092 °C)
Distance from Earth 30.70 light-years
Earth Similarity Index 0.202
Travel time at Voyager 1 speed 541,392 years
Almost certainly tidally locked to its host star given the close orbit

2 siblings around GJ 367

GJ 367 b shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
GJ 367 b this	Rocky Terrestrial	0.70	0.63	0.322	1,365	2021
GJ 367 c	Super-Earth	1.86	4.13	11.530	—	2023
GJ 367 d	Sub-Neptune	2.33	6.03	34.369	—	2023

GJ 367 b Planet Profile

Physical Specs

Radius

0.70 R⊕

Radius (Jupiter)

0.062 R♃

Mass

0.63 M⊕

Mass (Jupiter)

0.002 M♃

Density

10.20 g/cm³

Surface Gravity

1.30 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.202

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#529of 570

top 92.6%

This planet

0.70R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1349 b 0.70 R⊕ Kepler-378 c 0.70 R⊕ KOI-4978 b 0.70 R⊕

Metric	Earth	GJ 367 b	Jupiter
Radius (R⊕)	1.00	0.70	11.21
Mass (M⊕)	1.00	0.63	317.83
Density (g/cm³)	5.51	10.20	1.33
Surface Gravity (g)	1.00	1.30	2.53
Insolation (S⊕)	1.00	579.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	0.633 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HIP

HIP 47780

TIC

TIC 34068865

Gaia DR2

Gaia DR2 5412250540681250560

Gaia DR3

Gaia DR3 5412250540681250560

System

GJ 367

Percentile among Rocky Terrestrial cohort

Radius 0.699 R⊕ · percentile 7 / cohort 570

Mass 0.633 M⊕ · percentile 20 / cohort 570

Orbital period 0.32 d · percentile 1 / cohort 567

Distance 9.41 pc · percentile 4 / cohort 566

ESI 0.202 · percentile 14 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

0.322 days

Semi-major axis

0.0071 AU

Eccentricity

0.060

Inclination

79.89 °

Year Length

A year here lasts roughly 7.7 hours long on a nearly circular orbit at a mean orbital distance of 0.0071 AU.

Transit Fingerprint

Depth

0.021 %

Duration

0.629 h

Impact parameter b

0.584

Rp / R★

0.013990

Transit midpoint (BJD)

2,458,544.1364

Photometric dip

Transit produces a flux drop of 212 ppm lasting ≈ 0.63 h.

Extended Orbital Architecture

Planet / star radius ratio

0.013990

Semi-major axis / stellar radius

3.410

Impact parameter (b)

0.584

RV semi-amplitude (K)

1.003 m/s

Transit mid-time (BJD)

2,458,544.1364

Long. of periastron (ω)

66.00°

Angular separation (arcsec)

0.75300

Eq. Temperature

1,365K

(1092 °C)

Insolation (S⊕)

579.00

Earth = 1.00

Earth Similarity (ESI)

0.202

0 = alien, 1 = Earth-identical

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

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Lam et al. 2021

Instrument

TESS CCD Array

Publication

2021-12

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-2257 b · Sub-Neptune TOI-2285 b · Super-Earth TOI-1231 b · Sub-Neptune AU Mic c · Sub-Neptune LHS 1678 c · Rocky Terrestrial LHS 1478 b · Rocky Terrestrial TOI-2406 b · Sub-Neptune HD 207897 b · Sub-Neptune TOI-269 b · Sub-Neptune TIC 172900988 b · Gas Giant TOI-178 g · Sub-Neptune TOI-2076 d · Sub-Neptune

Host System: GJ 367

Spectral Class

M-type red dwarf

Effective Temperature

3,522 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.458 R☉

Stellar Mass

0.455 M☉

Metallicity [Fe/H]

-0.01

Extended Stellar Properties

Surface gravity (log g)

4.776 dex

Stellar density

6.697 g/cm³

Systemic radial velocity

47.92 km/s

Rotation period

51.30 days

Activity index (log R'HK)

-5.169

Metallicity ratio

[Fe/H]

Distance

9.41 parsec

Light-years 30.70 ly

V-band magnitude

10.15 mag

Voyager-speed travel 541,392 yr

Multi-band Host Photometry — 8 bands

Astrometric Data

Parallax

106.211 mas

Total Proper Motion

744.059 mas/yr

PM Right Ascension

-462.55 mas/yr

PM Declination

-582.81 mas/yr

Galactic Cartesian (pc)

x = -0.579 · y = 0.389 · z = -0.717

Equatorial (J2000)

RA 146.12146° · Dec -45.77902°

Galactic ℓ, b

272.243° · 5.659°

Ecliptic λ, β

172.945° · -54.308°

HTM-20 index

-908434844