Key parameters at a glance

A radius of 1.49 Earth radii
A mass of 2.82 Earth masses
Surface gravity around 1.27 g
An orbital period of 14.628 days
Semi-major axis 0.0784 AU
Distance from Earth 21.11 light-years
Earth Similarity Index 0.894
Travel time at Voyager 1 speed 372,282 years
Almost certainly tidally locked to its host star given the close orbit

GJ 625 b Planet Profile

Physical Specs

Radius

1.49 R⊕

Radius (Jupiter)

0.133 R♃

Mass

2.82 M⊕

Mass (Jupiter)

0.009 M♃

Density

4.68 g/cm³

Surface Gravity

1.27 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.894

HZ Position Unknown

Controversial No

Discovery

Year 2017

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#766of 1176

top 65.1%

This planet

1.49R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-174 c 1.49 R⊕ TOI-431 c 1.49 R⊕ Kepler-400 c 1.49 R⊕

Metric	Earth	GJ 625 b	Jupiter
Radius (R⊕)	1.00	1.49	11.21
Mass (M⊕)	1.00	2.82	317.83
Density (g/cm³)	5.51	4.68	1.33
Surface Gravity (g)	1.00	1.27	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	2.820 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 80459

TIC

TIC 207492082

Gaia DR2

Gaia DR2 1428427236986209024

Gaia DR3

Gaia DR3 1428427236986209024

System

GJ 625

Percentile among Super-Earth cohort

Radius 1.490 R⊕ · percentile 34 / cohort 1176

Mass 2.820 M⊕ · percentile 32 / cohort 1176

Orbital period 14.63 d · percentile 77 / cohort 1164

Distance 6.47 pc · percentile 1 / cohort 1171

ESI 0.894 · percentile 97 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

14.628 days

Semi-major axis

0.0784 AU

Eccentricity

0.130

Inclination

— °

Year Length

A year here lasts approximately 14.63 Earth days (4.0% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0784 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.894

0 = alien, 1 = Earth-identical

Insufficient insolation data. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Su Aacute Rez Mascare Ntilde O et al. 2017

Instrument

Multiple Instruments

Publication

2017-09

Observation locale

Ground

Discovery cohort

Planets confirmed in 2017 at Multiple Observatories (12 shown).

TRAPPIST-1 e · Rocky Terrestrial TRAPPIST-1 f · Rocky Terrestrial TRAPPIST-1 g · Rocky Terrestrial TRAPPIST-1 h · Rocky Terrestrial HD 34445 e · Neptune-like BD+03 2562 b · Gas Giant HD 111591 b · Gas Giant HD 34445 d · Neptune-like MOA-2012-BLG-006L b · Gas Giant HD 76920 b · Gas Giant HD 34445 f · Neptune-like HD 40956 b · Gas Giant

Host System: GJ 625

Spectral Class

M-type red dwarf

Effective Temperature

3,499 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.310 R☉

Stellar Mass

0.300 M☉

Metallicity [Fe/H]

-0.38

Extended Stellar Properties

Surface gravity (log g)

4.940 dex

Stellar density

11.726 g/cm³

Systemic radial velocity

-12.85 km/s

Rotational v·sin i

0.20 km/s

Rotation period

77.80 days

Metallicity ratio

[Fe/H]

Distance

6.47 parsec

Light-years 21.11 ly

V-band magnitude

10.07 mag

Voyager-speed travel 372,282 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

154.471 mas

Total Proper Motion

464.927 mas/yr

PM Right Ascension

432.07 mas/yr

PM Declination

-171.67 mas/yr

Galactic Cartesian (pc)

x = -0.234 · y = -0.535 · z = 0.812

Equatorial (J2000)

RA 246.35579° · Dec 54.30336°

Galactic ℓ, b

83.210° · 42.784°

Ecliptic λ, β

215.568° · 73.280°

HTM-20 index

-347066562