Key parameters at a glance

A radius of 2.75 Earth radii
A mass of 8.00 Earth masses
Surface gravity around 1.06 g
An orbital period of 3.023 days
Semi-major axis 0.0260 AU
Distance from Earth 44.82 light-years
Earth Similarity Index 0.670
Travel time at Voyager 1 speed 790,464 years
Almost certainly tidally locked to its host star given the close orbit

GJ 3779 b Planet Profile

Physical Specs

Radius

2.75 R⊕

Radius (Jupiter)

0.245 R♃

Mass

8.00 M⊕

Mass (Jupiter)

0.025 M♃

Density

2.11 g/cm³

Surface Gravity

1.06 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.670

HZ Position Unknown

Controversial No

Discovery

Year 2018

Method Radial Velocity

Facility Calar Alto Observatory

Telescope 3.5 m telescope

Size rank in cohort

Rank by radius

#804of 1978

top 40.6%

This planet

2.75R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-2545 b 2.75 R⊕ HIP 97166 c 2.75 R⊕ Kepler-304 d 2.75 R⊕

Metric	Earth	GJ 3779 b	Jupiter
Radius (R⊕)	1.00	2.75	11.21
Mass (M⊕)	1.00	8.00	317.83
Density (g/cm³)	5.51	2.11	1.33
Surface Gravity (g)	1.00	1.06	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	8.000 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 459826435

Gaia DR2

Gaia DR2 1446540213584440704

Gaia DR3

Gaia DR3 1446540213584440704

System

GJ 3779

Percentile among Sub-Neptune cohort

Radius 2.750 R⊕ · percentile 59 / cohort 1978

Mass 8.000 M⊕ · percentile 54 / cohort 1978

Orbital period 3.02 d · percentile 5 / cohort 1946

Distance 13.74 pc · percentile 2 / cohort 1975

ESI 0.670 · percentile 90 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.023 days

Semi-major axis

0.0260 AU

Eccentricity

0.070

Inclination

— °

Year Length

A year here lasts approximately 3.02 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0260 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.670

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Luque et al. 2018

Instrument

CARMENES

Publication

2018-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2018 at Calar Alto Observatory (2 shown).

GJ 1265 b · Sub-Neptune HD 180617 b · Sub-Neptune

Host System: GJ 3779

Spectral Class

M-type red dwarf

Effective Temperature

3,324 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.281 R☉

Stellar Mass

0.270 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

5.050 dex

Stellar density

16.233 g/cm³

Systemic radial velocity

-19.36 km/s

Rotational v·sin i

2.00 km/s

Rotation period

95.00 days

Metallicity ratio

[Fe/H]

Distance

13.74 parsec

Light-years 44.82 ly

V-band magnitude

13.04 mag

Voyager-speed travel 790,464 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

72.735 mas

Total Proper Motion

1,061.999 mas/yr

PM Right Ascension

-615.95 mas/yr

PM Declination

-865.13 mas/yr

Galactic Cartesian (pc)

x = -0.851 · y = -0.322 · z = 0.414

Equatorial (J2000)

RA 200.73354° · Dec 24.46394°

Galactic ℓ, b

14.082° · 82.429°

Ecliptic λ, β

188.739° · 30.539°

HTM-20 index

-1907574083