Key parameters at a glance

A radius of 2.63 Earth radii
A mass of 7.60 Earth masses
Surface gravity around 1.10 g
An orbital period of 50.800 days
Semi-major axis 0.2324 AU
Equilibrium temperature 309 K (35 °C)
Distance from Earth 38.78 light-years
Earth Similarity Index 0.720
Travel time at Voyager 1 speed 683,844 years

Context from the literature

Gliese 414 Ab, also known as GJ 414 Ab, is a sub-Neptune exoplanet orbiting Gliese 414 A, an orange dwarf located 39 light-years from Earth, in the constellation Ursa Major. It is at least 7.6 times more massive than the Earth and is 3 times larger, having a diameter of 37600 km. It orbits its host star at a distance of 0.24 astronomical units (36,000,000 km), completing one revolution every 51 days. The distance of Gliese 414 A b from its star makes it to be located in the inner part of the optmistic habitable zone, and the planet has an equilibrium temperature of 35.5 °C.

Excerpted from Wikipedia · full article

1 sibling around GJ 414 A

GJ 414 A 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 414 A b this	Sub-Neptune	2.63	7.60	50.800	309	2021
GJ 414 A c	Neptune-like	8.40	53.83	749.830	125	2021

GJ 414 A b Planet Profile

Physical Specs

Radius

2.63 R⊕

Radius (Jupiter)

0.235 R♃

Mass

7.60 M⊕

Mass (Jupiter)

0.024 M♃

Density

2.30 g/cm³

Surface Gravity

1.10 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.720

HZ Position Unknown

Controversial No

Discovery

Year 2021

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#969of 1978

top 48.9%

This planet

2.63R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1241 b 2.63 R⊕ GJ 3473 c 2.63 R⊕ Kepler-319 c 2.63 R⊕

Metric	Earth	GJ 414 A b	Jupiter
Radius (R⊕)	1.00	2.63	11.21
Mass (M⊕)	1.00	7.60	317.83
Density (g/cm³)	5.51	2.30	1.33
Surface Gravity (g)	1.00	1.10	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	7.600 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 97101

HIP

HIP 54646

TIC

TIC 9001920

Gaia DR2

Gaia DR2 732857558276385664

Gaia DR3

Gaia DR3 732857558276385664

System

GJ 414

Percentile among Sub-Neptune cohort

Radius 2.630 R⊕ · percentile 50 / cohort 1978

Mass 7.600 M⊕ · percentile 49 / cohort 1978

Orbital period 50.80 d · percentile 85 / cohort 1946

Distance 11.89 pc · percentile 2 / cohort 1975

ESI 0.720 · percentile 94 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

50.800 days

Semi-major axis

0.2324 AU

Eccentricity

0.450

Inclination

— °

Year Length

A year here lasts approximately 50.80 Earth days (13.9% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.2324 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

2.050 m/s

Transit mid-time (BJD)

2,455,179.9000

Long. of periastron (ω)

111.00°

Angular separation (arcsec)

19.50000

Eq. Temperature

309K

(35 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.720

0 = alien, 1 = Earth-identical

Insufficient insolation data — liquid water is physically possible with adequate atmospheric pressure.

Discovery Paper

Primary reference

Dedrick et al. 2021

Instrument

HIRES Spectrometer

Publication

2021-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2021 at W. M. Keck Observatory (2 shown).

Kepler-129 d · Gas Giant GJ 414 A c · Neptune-like

Host System: GJ 414 A

Spectral Class

K-type orange

Effective Temperature

4,120 K — cooler than the Sun (5,778 K)

Estimated Age

12.40 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.680 R☉

Stellar Mass

0.650 M☉

Metallicity [Fe/H]

0.24

Extended Stellar Properties

Surface gravity (log g)

4.650 dex

Stellar density

2.152 g/cm³

Systemic radial velocity

-17.20 km/s

Rotational v·sin i

3.00 km/s

Metallicity ratio

[Fe/H]

Distance

11.89 parsec

Light-years 38.78 ly

V-band magnitude

8.31 mag

Voyager-speed travel 683,844 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

84.080 mas

Total Proper Motion

623.637 mas/yr

PM Right Ascension

591.62 mas/yr

PM Declination

-197.25 mas/yr

Galactic Cartesian (pc)

x = -0.843 · y = 0.183 · z = 0.507

Equatorial (J2000)

RA 167.77450° · Dec 30.44517°

Galactic ℓ, b

198.372° · 67.813°

Ecliptic λ, β

156.342° · 23.097°

HTM-20 index

1976359464

Observation Record

Photometric series

Stellar spectra

Archive notes

Wikipedia → Image: Wikimedia Commons · Pablo Carlos Budassi · CC BY-SA 4.0

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