Key parameters at a glance

A radius of 12.80 Earth radii
A mass of 1,840.86 Earth masses
Surface gravity around 11.24 g
An orbital period of 1,051.445 days
Semi-major axis 1.7350 AU
Distance from Earth 52.27 light-years
Earth Similarity Index 0.437
Travel time at Voyager 1 speed 921,846 years

Context from the literature

Gliese 676 is a 10th-magnitude wide binary system of red dwarfs that has an estimated minimum separation of 800 AU with an orbital period of greater than 20,000 years. It is located approximately 54 light years away in the constellation Ara. In 2009, a gas giant was found in orbit around the primary star, in addition to its confirmation in 2011 there was also a strong indication of a companion; the second gas giant was characterised in 2012, along with two much smaller planets.

Excerpted from Wikipedia · full article

3 siblings around GJ 676 A

GJ 676 A b shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
GJ 676 A d	Super-Earth	1.78	3.81	3.601	—	2012
GJ 676 A e	Sub-Neptune	2.47	6.67	35.474	—	2012
GJ 676 A b this	Gas Giant	12.80	1,840.86	1,051.445	—	2010
GJ 676 A c	Gas Giant	12.30	4,288.14	13,921.423	—	2016

GJ 676 A b Planet Profile

Physical Specs

Radius

12.80 R⊕

Radius (Jupiter)

1.140 R♃

Mass

1,840.86 M⊕

Mass (Jupiter)

5.792 M♃

Density

4.82 g/cm³

Surface Gravity

11.24 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.437

HZ Position Unknown

Controversial No

Discovery

Year 2010

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#1063of 1771

top 60.0%

This planet

12.80R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 240210 b 12.80 R⊕ HD 29985 b 12.80 R⊕ HD 148164 c 12.80 R⊕

Metric	Earth	GJ 676 A b	Jupiter
Radius (R⊕)	1.00	12.80	11.21
Mass (M⊕)	1.00	1,840.86	317.83
Density (g/cm³)	5.51	4.82	1.33
Surface Gravity (g)	1.00	11.24	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,840.862 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	1,557.301 M⊕	Lower bound from radial-velocity fitting.
Computed mass	2,127.386 M⊕	Model-computed mass (e.g. from mass-radius relation).

Star Catalogue Identifiers

HIP

HIP 85647

TIC

TIC 369021303

Gaia DR2

Gaia DR2 5925209583053212800

Gaia DR3

Gaia DR3 5925209583053212800

System

GJ 676

Percentile among Gas Giant cohort

Radius 12.800 R⊕ · percentile 37 / cohort 1771

Mass 1,840.862 M⊕ · percentile 78 / cohort 1747

Orbital period 1,051.45 d · percentile 78 / cohort 1533

Distance 16.03 pc · percentile 2 / cohort 1759

ESI 0.437 · percentile 96 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,051.445 days

Semi-major axis

1.7350 AU

Eccentricity

0.319

Inclination

48.92 °

Year Length

A year here lasts about 2.88 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.7350 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.437

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Forveille et al. 2011

Instrument

HARPS Spectrograph

Publication

2011-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2010 at La Silla Observatory (12 shown).

GJ 3634 b · Sub-Neptune HD 10180 f · Neptune-like HD 10180 e · Neptune-like HD 204313 b · Gas Giant HD 28254 b · Gas Giant HD 1690 b · Gas Giant HD 10180 h · Neptune-like HD 113538 c · Gas Giant HD 25171 b · Gas Giant HD 8535 b · Gas Giant HD 44219 b · Gas Giant HD 43197 b · Gas Giant

Host System: GJ 676 A

Spectral Class

M-type red dwarf

Effective Temperature

3,734 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.690 R☉

Stellar Mass

0.626 M☉

Metallicity [Fe/H]

0.23

Extended Stellar Properties

Surface gravity (log g)

4.620 dex

Stellar density

3.232 g/cm³

Systemic radial velocity

-39.04 km/s

Rotational v·sin i

1.60 km/s

Metallicity ratio

[Fe/H]

Distance

16.03 parsec

Light-years 52.27 ly

V-band magnitude

9.58 mag

Voyager-speed travel 921,846 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

62.365 mas

Total Proper Motion

317.084 mas/yr

PM Right Ascension

-257.87 mas/yr

PM Declination

-184.51 mas/yr

Galactic Cartesian (pc)

x = -0.081 · y = -0.615 · z = -0.784

Equatorial (J2000)

RA 262.54489° · Dec -51.63778°

Galactic ℓ, b

339.103° · -9.542°

Ecliptic λ, β

264.747° · -28.334°

HTM-20 index

-720701838

Observation Record

Photometric series

RV measurements

Archive notes

Wikipedia →

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