Key parameters at a glance

A radius of 2.24 Earth radii
A mass of 5.63 Earth masses
Surface gravity around 1.12 g
An orbital period of 13.851 days
Semi-major axis 0.0905 AU
Distance from Earth 32.14 light-years
Earth Similarity Index 0.743
Travel time at Voyager 1 speed 566,709 years
Almost certainly tidally locked to its host star given the close orbit

Gl 49 b Planet Profile

Physical Specs

Radius

2.24 R⊕

Radius (Jupiter)

0.200 R♃

Mass

5.63 M⊕

Mass (Jupiter)

0.018 M♃

Density

2.75 g/cm³

Surface Gravity

1.12 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.743

HZ Position Unknown

Controversial No

Discovery

Year 2019

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1607of 1978

top 81.2%

This planet

2.24R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-69 b 2.24 R⊕ Kepler-284 b 2.24 R⊕ Kepler-196 c 2.24 R⊕

Metric	Earth	Gl 49 b	Jupiter
Radius (R⊕)	1.00	2.24	11.21
Mass (M⊕)	1.00	5.63	317.83
Density (g/cm³)	5.51	2.75	1.33
Surface Gravity (g)	1.00	1.12	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	5.630 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 4872

TIC

TIC 256419669

Gaia DR2

Gaia DR2 522863309964987520

Gaia DR3

Gaia DR3 522863309964987520

System

Gl 49

Percentile among Sub-Neptune cohort

Radius 2.240 R⊕ · percentile 18 / cohort 1978

Mass 5.630 M⊕ · percentile 18 / cohort 1978

Orbital period 13.85 d · percentile 47 / cohort 1946

Distance 9.85 pc · percentile 1 / cohort 1975

ESI 0.743 · percentile 96 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

13.851 days

Semi-major axis

0.0905 AU

Eccentricity

0.363

Inclination

— °

Year Length

A year here lasts approximately 13.85 Earth days (3.8% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0905 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.743

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Perger et al. 2019

Instrument

Multiple Instruments

Publication

2019-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2019 at Multiple Observatories (8 shown).

GJ 357 c · Super-Earth GJ 357 d · Sub-Neptune HR 5183 b · Gas Giant NSVS 14256825 b · Gas Giant 7 CMa c · Gas Giant HD 213885 c · Neptune-like USco1556 b · Gas Giant USco1621 b · Gas Giant

Host System: Gl 49

Spectral Class

M-type red dwarf

Effective Temperature

3,805 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.511 R☉

Stellar Mass

0.515 M☉

Metallicity [Fe/H]

0.13

Extended Stellar Properties

Surface gravity (log g)

4.690 dex

Stellar density

4.800 g/cm³

Systemic radial velocity

-5.78 km/s

Rotational v·sin i

2.00 km/s

Rotation period

18.86 days

Metallicity ratio

[Fe/H]

Distance

9.85 parsec

Light-years 32.14 ly

V-band magnitude

9.56 mag

Voyager-speed travel 566,709 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

101.465 mas

Total Proper Motion

736.738 mas/yr

PM Right Ascension

731.14 mas/yr

PM Declination

90.69 mas/yr

Galactic Cartesian (pc)

x = 0.447 · y = 0.125 · z = 0.886

Equatorial (J2000)

RA 15.66873° · Dec 62.34544°

Galactic ℓ, b

124.235° · -0.498°

Ecliptic λ, β

46.278° · 49.712°

HTM-20 index

-1467326533