Key parameters at a glance

A radius of 3.25 Earth radii
A mass of 10.62 Earth masses
Surface gravity around 1.01 g
An orbital period of 389.700 days
Semi-major axis 0.5714 AU
Distance from Earth 26.21 light-years
Earth Similarity Index 0.612
Travel time at Voyager 1 speed 462,226 years

GJ 1151 c Planet Profile

Physical Specs

Radius

3.25 R⊕

Radius (Jupiter)

0.290 R♃

Mass

10.62 M⊕

Mass (Jupiter)

0.033 M♃

Density

1.70 g/cm³

Surface Gravity

1.01 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.612

HZ Position Unknown

Controversial No

Discovery

Year 2023

Method Radial Velocity

Facility Multiple Facilities

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#312of 1978

top 15.7%

This planet

3.25R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-199 c 3.25 R⊕ GJ 163 b 3.25 R⊕ HD 20781 d 3.25 R⊕

Metric	Earth	GJ 1151 c	Jupiter
Radius (R⊕)	1.00	3.25	11.21
Mass (M⊕)	1.00	10.62	317.83
Density (g/cm³)	5.51	1.70	1.33
Surface Gravity (g)	1.00	1.01	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	10.620 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 11893637

Gaia DR2

Gaia DR2 786834302079285632

Gaia DR3

Gaia DR3 786834302080370304

System

GJ 1151

Percentile among Sub-Neptune cohort

Radius 3.250 R⊕ · percentile 84 / cohort 1978

Mass 10.620 M⊕ · percentile 78 / cohort 1978

Orbital period 389.70 d · percentile 99 / cohort 1946

Distance 8.04 pc · percentile 1 / cohort 1975

ESI 0.612 · percentile 83 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

389.700 days

Semi-major axis

0.5714 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts about 1.07 Earth years at a mean orbital distance of 0.5714 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.612

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Blanco Pozo et al. 2023

Instrument

Multiple Instruments

Publication

2023-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2023 at Multiple Facilities (3 shown).

HD 89839 b · Gas Giant HD 167677 b · Gas Giant HD 165131 b · Gas Giant

Host System: GJ 1151

Spectral Class

M-type red dwarf

Effective Temperature

3,280 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.178 R☉

Stellar Mass

0.164 M☉

Metallicity [Fe/H]

-0.12

Extended Stellar Properties

Surface gravity (log g)

5.090 dex

Stellar density

29.347 g/cm³

Rotational v·sin i

2.00 km/s

Rotation period

140.00 days

Activity index (log R'HK)

-5.220

Metallicity ratio

[Fe/H]

Distance

8.04 parsec

Light-years 26.21 ly

V-band magnitude

13.76 mag

Voyager-speed travel 462,226 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

124.407 mas

Total Proper Motion

1,821.045 mas/yr

PM Right Ascension

-1,545.70 mas/yr

PM Declination

-962.82 mas/yr

Galactic Cartesian (pc)

x = -0.664 · y = 0.026 · z = 0.747

Equatorial (J2000)

RA 177.73049° · Dec 48.37323°

Galactic ℓ, b

147.870° · 65.720°

Ecliptic λ, β

154.154° · 42.481°

HTM-20 index

-443347484