Key parameters at a glance

A radius of 1.45 Earth radii
A mass of 2.69 Earth masses
Surface gravity around 1.28 g
An orbital period of 12.939 days
Semi-major axis 0.0788 AU
Equilibrium temperature 350 K (77 °C)
Distance from Earth 18.51 light-years
Earth Similarity Index 0.804
Travel time at Voyager 1 speed 326,457 years
Almost certainly tidally locked to its host star given the close orbit

1 sibling around GJ 411

GJ 411 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
GJ 411 b this	Super-Earth	1.45	2.69	12.939	350	2019
HD 95735 c	Sub-Neptune	3.76	13.60	2,946.000	—	2021

GJ 411 b Planet Profile

Physical Specs

Radius

1.45 R⊕

Radius (Jupiter)

0.129 R♃

Mass

2.69 M⊕

Mass (Jupiter)

0.008 M♃

Density

4.85 g/cm³

Surface Gravity

1.28 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.804

HZ Position Inner

Controversial No

Discovery

Year 2019

Method Radial Velocity

Facility Haute-Provence Observatory

Telescope 1.93 m Telescope

Size rank in cohort

Rank by radius

#837of 1176

top 71.1%

This planet

1.45R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-1226 b 1.45 R⊕ Kepler-361 b 1.45 R⊕ Kepler-375 b 1.45 R⊕

Metric	Earth	GJ 411 b	Jupiter
Radius (R⊕)	1.00	1.45	11.21
Mass (M⊕)	1.00	2.69	317.83
Density (g/cm³)	5.51	4.85	1.33
Surface Gravity (g)	1.00	1.28	2.53
Insolation (S⊕)	1.00	3.13	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	2.690 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 95735

HIP

HIP 54035

TIC

TIC 166646191

System

GJ 411

Percentile among Super-Earth cohort

Radius 1.450 R⊕ · percentile 28 / cohort 1176

Mass 2.690 M⊕ · percentile 26 / cohort 1176

Orbital period 12.94 d · percentile 72 / cohort 1164

Distance 5.68 pc · percentile 1 / cohort 1171

ESI 0.804 · percentile 90 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

12.939 days

Semi-major axis

0.0788 AU

Eccentricity

0.063

Inclination

— °

Year Length

A year here lasts approximately 12.94 Earth days (3.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0788 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

1.381 m/s

Transit mid-time (BJD)

2,456,305.3800

Long. of periastron (ω)

-30.00°

Angular separation (arcsec)

13.90000

Eq. Temperature

350K

(77 °C)

Insolation (S⊕)

3.13

Earth = 1.00

Earth Similarity (ESI)

0.804

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

D Iacute Az et al. 2019

Instrument

SOPHIE Spectrograph

Publication

2019-05

Observation locale

Ground

Host System: GJ 411

Spectral Class

M-type red dwarf

Effective Temperature

3,719 K — cooler than the Sun (5,778 K)

Estimated Age

8.05 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.369 R☉

Stellar Mass

0.390 M☉

Metallicity [Fe/H]

-0.36

Extended Stellar Properties

Surface gravity (log g)

4.895 dex

Stellar density

9.601 g/cm³

Systemic radial velocity

-84.65 km/s

Rotational v·sin i

2.00 km/s

Rotation period

56.16 days

Activity index (log R'HK)

-5.470

Metallicity ratio

[Fe/H]

Distance

5.68 parsec

Light-years 18.51 ly

V-band magnitude

7.49 mag

Voyager-speed travel 326,457 yr

Multi-band Host Photometry — 6 bands

Astrometric Data

Parallax

392.400 mas

Total Proper Motion

4,802.155 mas/yr

PM Right Ascension

-580.00 mas/yr

PM Declination

-4,767.00 mas/yr

Galactic Cartesian (pc)

x = -0.785 · y = 0.198 · z = 0.587

Equatorial (J2000)

RA 165.83447° · Dec 35.97232°

Galactic ℓ, b

185.113° · 65.431°

Ecliptic λ, β

152.102° · 27.396°

HTM-20 index

100861203

Observation Record

Photometric series

Stellar spectra

Archive notes