Key parameters at a glance

A radius of 4.17 Earth radii
A mass of 16.20 Earth masses
Surface gravity around 0.93 g
An orbital period of 69.971 days
Semi-major axis 0.2830 AU
Distance from Earth 92.77 light-years
Earth Similarity Index 0.531
Travel time at Voyager 1 speed 1,635,996 years

GJ 2056 b Planet Profile

Physical Specs

Radius

4.17 R⊕

Radius (Jupiter)

0.372 R♃

Mass

16.20 M⊕

Mass (Jupiter)

0.051 M♃

Density

1.23 g/cm³

Surface Gravity

0.93 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.531

HZ Position Unknown

Controversial No

Discovery

Year 2020

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#526of 574

top 91.5%

This planet

4.17R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

GJ 436 b 4.17 R⊕ Kepler-619 d 4.17 R⊕ Kepler-421 b 4.16 R⊕

Metric	Earth	GJ 2056 b	Jupiter
Radius (R⊕)	1.00	4.17	11.21
Mass (M⊕)	1.00	16.20	317.83
Density (g/cm³)	5.51	1.23	1.33
Surface Gravity (g)	1.00	0.93	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	16.200 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 34785

TIC

TIC 65406275

Gaia DR2

Gaia DR2 5617244278837970816

Gaia DR3

Gaia DR3 5617244278837970816

System

GJ 2056

Percentile among Neptune-like cohort

Radius 4.170 R⊕ · percentile 8 / cohort 574

Mass 16.200 M⊕ · percentile 14 / cohort 574

Orbital period 69.97 d · percentile 75 / cohort 524

Distance 28.44 pc · percentile 9 / cohort 572

ESI 0.531 · percentile 96 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

69.971 days

Semi-major axis

0.2830 AU

Eccentricity

0.720

Inclination

— °

Year Length

A year here lasts approximately 69.97 Earth days (19.2% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.2830 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.531

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Feng et al. 2020

Instrument

Multiple Instruments

Publication

2020-10

Observation locale

Ground

Discovery cohort

Planets confirmed in 2020 at Multiple Observatories (12 shown).

GJ 3473 c · Sub-Neptune HIP 38594 b · Sub-Neptune HD 216520 c · Sub-Neptune HD 216520 b · Sub-Neptune HIP 107772 b · Sub-Neptune GJ 480 b · Sub-Neptune HIP 4845 b · Sub-Neptune HD 190007 b · Neptune-like GJ 687 c · Neptune-like HD 238090 b · Sub-Neptune HIP 48714 b · Neptune-like HIP 38594 c · Neptune-like

Host System: GJ 2056

Spectral Class

M-type red dwarf

Effective Temperature

4,070 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.710 R☉

Stellar Mass

0.620 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.481 dex

Stellar density

2.074 g/cm³

Systemic radial velocity

41.62 km/s

Distance

28.44 parsec

Light-years 92.77 ly

V-band magnitude

10.37 mag

Voyager-speed travel 1,635,996 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

35.129 mas

Total Proper Motion

114.447 mas/yr

PM Right Ascension

-114.36 mas/yr

PM Declination

-4.59 mas/yr

Galactic Cartesian (pc)

x = -0.281 · y = 0.863 · z = -0.421

Equatorial (J2000)

RA 108.01949° · Dec -24.89210°

Galactic ℓ, b

237.437° · -6.853°

Ecliptic λ, β

114.209° · -46.828°

HTM-20 index

-1135296981