Key parameters at a glance

A radius of 1.53 Earth radii
A mass of 2.97 Earth masses
Surface gravity around 1.27 g
An orbital period of 1.634 days
Semi-major axis 0.0153 AU
Distance from Earth 23.60 light-years
Earth Similarity Index 0.885
Travel time at Voyager 1 speed 416,172 years
Almost certainly tidally locked to its host star given the close orbit

1 sibling around GJ 4274

GJ 4274 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
GJ 4274 b this	Super-Earth	1.53	2.97	1.634	—	2026
GJ 4274 c	Sub-Neptune	2.83	8.39	69.570	—	2026

GJ 4274 b Planet Profile

Physical Specs

Radius

1.53 R⊕

Radius (Jupiter)

0.137 R♃

Mass

2.97 M⊕

Mass (Jupiter)

0.009 M♃

Density

4.56 g/cm³

Surface Gravity

1.27 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.885

HZ Position Inner

Controversial No

Discovery

Year 2026

Method Radial Velocity

Facility Mauna Kea Observatory

Telescope 3.58 m Canada-France-Hawaii Telescope (CFHT)

Size rank in cohort

Rank by radius

#687of 1176

top 58.3%

This planet

1.53R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-228 b 1.53 R⊕ Kepler-147 b 1.53 R⊕ Kepler-296 e 1.53 R⊕

Metric	Earth	GJ 4274 b	Jupiter
Radius (R⊕)	1.00	1.53	11.21
Mass (M⊕)	1.00	2.97	317.83
Density (g/cm³)	5.51	4.56	1.33
Surface Gravity (g)	1.00	1.27	2.53
Insolation (S⊕)	1.00	14.70	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	2.970 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 12652442

Gaia DR2

Gaia DR2 2595284016771502080

Gaia DR3

Gaia DR3 2595284016771502080

System

GJ 4274

Percentile among Super-Earth cohort

Radius 1.530 R⊕ · percentile 40 / cohort 1176

Mass 2.970 M⊕ · percentile 38 / cohort 1176

Orbital period 1.63 d · percentile 10 / cohort 1164

Distance 7.24 pc · percentile 1 / cohort 1171

ESI 0.885 · percentile 96 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

1.634 days

Semi-major axis

0.0153 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 1.63 Earth days (0.4% of a terrestrial year) at a mean orbital distance of 0.0153 AU.

Eq. Temperature

—

Insolation (S⊕)

14.70

Earth = 1.00

Earth Similarity (ESI)

0.885

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Charpentier et al. 2026

Instrument

SPIRou

Publication

2026-01

Observation locale

Ground

Host System: GJ 4274

Spectral Class

M-type red dwarf

Effective Temperature

3,228 K — cooler than the Sun (5,778 K)

Estimated Age

0.12 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.190 R☉

Stellar Mass

0.180 M☉

Metallicity [Fe/H]

-0.19

Extended Stellar Properties

Surface gravity (log g)

5.260 dex

Rotational v·sin i

2.30 km/s

Rotation period

4.60 days

Metallicity ratio

[Fe/H]

Distance

7.24 parsec

Light-years 23.60 ly

V-band magnitude

13.31 mag

Voyager-speed travel 416,172 yr

Multi-band Host Photometry — 6 bands

Astrometric Data

Parallax

138.178 mas

Total Proper Motion

781.733 mas/yr

PM Right Ascension

308.43 mas/yr

PM Declination

-718.31 mas/yr

Galactic Cartesian (pc)

x = 0.869 · y = -0.391 · z = -0.303

Equatorial (J2000)

RA 335.78055° · Dec -17.61041°

Galactic ℓ, b

40.611° · -54.559°

Ecliptic λ, β

331.135° · -7.010°

HTM-20 index

2054828056