Key parameters at a glance

A radius of 3.27 Earth radii
A mass of 10.75 Earth masses
Surface gravity around 1.01 g
An orbital period of 5.101 days
Semi-major axis 0.0469 AU
Equilibrium temperature 611 K (338 °C)
Distance from Earth 55.33 light-years
Earth Similarity Index 0.371
Travel time at Voyager 1 speed 975,832 years
Almost certainly tidally locked to its host star given the close orbit

GJ 724 b Planet Profile

Physical Specs

Radius

3.27 R⊕

Radius (Jupiter)

0.292 R♃

Mass

10.75 M⊕

Mass (Jupiter)

0.034 M♃

Density

1.69 g/cm³

Surface Gravity

1.01 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.371

HZ Position Inner

Controversial No

Discovery

Year 2023

Method Radial Velocity

Facility Calar Alto Observatory

Telescope 3.5 m telescope

Size rank in cohort

Rank by radius

#297of 1978

top 15.0%

This planet

3.27R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-1117 d 3.27 R⊕ Kepler-576 b 3.27 R⊕ Kepler-1990 b 3.27 R⊕

Metric	Earth	GJ 724 b	Jupiter
Radius (R⊕)	1.00	3.27	11.21
Mass (M⊕)	1.00	10.75	317.83
Density (g/cm³)	5.51	1.69	1.33
Surface Gravity (g)	1.00	1.01	2.53
Insolation (S⊕)	1.00	23.32	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	10.750 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 91608

TIC

TIC 424934357

Gaia DR2

Gaia DR2 4105386718001211392

Gaia DR3

Gaia DR3 4105386688016878336

System

GJ 724

Percentile among Sub-Neptune cohort

Radius 3.270 R⊕ · percentile 85 / cohort 1978

Mass 10.750 M⊕ · percentile 79 / cohort 1978

Orbital period 5.10 d · percentile 12 / cohort 1946

Distance 16.97 pc · percentile 3 / cohort 1975

ESI 0.371 · percentile 46 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

5.101 days

Semi-major axis

0.0469 AU

Eccentricity

0.577

Inclination

— °

Year Length

A year here lasts approximately 5.10 Earth days (1.4% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0469 AU.

Eq. Temperature

611K

(338 °C)

Insolation (S⊕)

23.32

Earth = 1.00

Earth Similarity (ESI)

0.371

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

Gorrini et al. 2023

Instrument

CARMENES

Publication

2023-10

Observation locale

Ground

Discovery cohort

Planets confirmed in 2023 at Calar Alto Observatory (3 shown).

Wolf 1069 b · Rocky Terrestrial GJ 3988 b · Super-Earth HN Lib b · Sub-Neptune

Host System: GJ 724

Spectral Class

M-type red dwarf

Effective Temperature

3,799 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.522 R☉

Stellar Mass

0.527 M☉

Metallicity [Fe/H]

-0.02

Extended Stellar Properties

Surface gravity (log g)

4.880 dex

Stellar density

4.806 g/cm³

Systemic radial velocity

-33.36 km/s

Rotational v·sin i

2.00 km/s

Rotation period

57.00 days

Activity index (log R'HK)

-4.641

Metallicity ratio

[Fe/H]

Distance

16.97 parsec

Light-years 55.33 ly

V-band magnitude

10.64 mag

Voyager-speed travel 975,832 yr

Multi-band Host Photometry — 8 bands

Astrometric Data

Parallax

58.913 mas

Total Proper Motion

677.842 mas/yr

PM Right Ascension

-94.32 mas/yr

PM Declination

-671.25 mas/yr

Galactic Cartesian (pc)

x = 0.173 · y = -0.957 · z = -0.231

Equatorial (J2000)

RA 280.23837° · Dec -13.38250°

Galactic ℓ, b

19.825° · -3.781°

Ecliptic λ, β

280.100° · 9.698°

HTM-20 index

442087004