Key parameters at a glance

A radius of 2.83 Earth radii
A mass of 8.39 Earth masses
Surface gravity around 1.05 g
An orbital period of 69.570 days
Semi-major axis 0.1860 AU
Distance from Earth 23.60 light-years
Earth Similarity Index 0.660
Travel time at Voyager 1 speed 416,172 years

1 sibling around GJ 4274

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

GJ 4274 c Planet Profile

Physical Specs

Radius

2.83 R⊕

Radius (Jupiter)

0.252 R♃

Mass

8.39 M⊕

Mass (Jupiter)

0.026 M♃

Density

2.03 g/cm³

Surface Gravity

1.05 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.660

HZ Position Outer

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

#703of 1978

top 35.5%

This planet

2.83R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 3167 e 2.83 R⊕ GJ 3634 b 2.83 R⊕ Kepler-1099 b 2.83 R⊕

Metric	Earth	GJ 4274 c	Jupiter
Radius (R⊕)	1.00	2.83	11.21
Mass (M⊕)	1.00	8.39	317.83
Density (g/cm³)	5.51	2.03	1.33
Surface Gravity (g)	1.00	1.05	2.53
Insolation (S⊕)	1.00	0.10	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	8.390 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 Sub-Neptune cohort

Radius 2.830 R⊕ · percentile 64 / cohort 1978

Mass 8.390 M⊕ · percentile 58 / cohort 1978

Orbital period 69.57 d · percentile 90 / cohort 1946

Distance 7.24 pc · percentile 1 / cohort 1975

ESI 0.660 · percentile 89 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

69.570 days

Semi-major axis

0.1860 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 69.57 Earth days (19.0% of a terrestrial year) at a mean orbital distance of 0.1860 AU.

Eq. Temperature

—

Insolation (S⊕)

0.10

Earth = 1.00

Earth Similarity (ESI)

0.660

0 = alien, 1 = Earth-identical

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