Key parameters at a glance

A radius of 3.33 Earth radii
A mass of 11.09 Earth masses
Surface gravity around 1.00 g
An orbital period of 4.694 days
Semi-major axis 0.0390 AU
Distance from Earth 14.84 light-years
Earth Similarity Index 0.604
Travel time at Voyager 1 speed 261,645 years
Almost certainly tidally locked to its host star given the close orbit

Context from the literature

Gliese 674 b is an extrasolar planet approximately 15 light years away in the constellation of Ara. This planet orbits tightly around Gliese 674. It is a sub-Neptune-or-Uranus-mass planet either gaseous or rocky. It orbits as close as 0.039 AU from the star and takes only 4.6938 days to orbit. This planet has a similar eccentricity to Mercury (e=0.2). The discovery of the planet was announced on January 7, 2007 by using the HARPS spectrograph mounted on the ESO's 3.6 meter telescope at La Silla, Chile.

Excerpted from Wikipedia · full article

GJ 674 b Planet Profile

Physical Specs

Radius

3.33 R⊕

Radius (Jupiter)

0.297 R♃

Mass

11.09 M⊕

Mass (Jupiter)

0.035 M♃

Density

1.65 g/cm³

Surface Gravity

1.00 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.604

HZ Position Unknown

Controversial No

Discovery

Year 2007

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#261of 1978

top 13.1%

This planet

3.33R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

GJ 422 b 3.33 R⊕ Kepler-11 g 3.33 R⊕ Kepler-264 b 3.33 R⊕

Metric	Earth	GJ 674 b	Jupiter
Radius (R⊕)	1.00	3.33	11.21
Mass (M⊕)	1.00	11.09	317.83
Density (g/cm³)	5.51	1.65	1.33
Surface Gravity (g)	1.00	1.00	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	11.090 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 85523

TIC

TIC 218263393

Gaia DR2

Gaia DR2 5951824121022278144

Gaia DR3

Gaia DR3 5951824121022278144

System

GJ 674

Percentile among Sub-Neptune cohort

Radius 3.330 R⊕ · percentile 87 / cohort 1978

Mass 11.090 M⊕ · percentile 80 / cohort 1978

Orbital period 4.69 d · percentile 11 / cohort 1946

Distance 4.55 pc · percentile 0 / cohort 1975

ESI 0.604 · percentile 83 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

4.694 days

Semi-major axis

0.0390 AU

Eccentricity

0.200

Inclination

— °

Year Length

A year here lasts approximately 4.69 Earth days (1.3% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0390 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.604

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Bonfils et al. 2007

Instrument

HARPS Spectrograph

Publication

2007-10

Observation locale

Ground

Discovery cohort

Planets confirmed in 2007 at La Silla Observatory (10 shown).

GJ 581 c · Sub-Neptune HD 219828 b · Neptune-like HD 70573 b · Gas Giant HD 221287 b · Gas Giant HD 171028 b · Gas Giant BD-13 2130 b · Gas Giant HD 156846 b · Gas Giant HD 190647 b · Gas Giant HD 4113 b · Gas Giant HD 100777 b · Gas Giant

Host System: GJ 674

Spectral Class

M-type red dwarf

Effective Temperature

3,600 K — cooler than the Sun (5,778 K)

Estimated Age

0.55 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.365 R☉

Stellar Mass

0.350 M☉

Metallicity [Fe/H]

-0.28

Extended Stellar Properties

Surface gravity (log g)

4.860 dex

Stellar density

10.210 g/cm³

Rotational v·sin i

1.00 km/s

Metallicity ratio

[Fe/H]

Distance

4.55 parsec

Light-years 14.84 ly

V-band magnitude

9.38 mag

Voyager-speed travel 261,645 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

219.801 mas

Total Proper Motion

1,050.091 mas/yr

PM Right Ascension

572.58 mas/yr

PM Declination

-880.25 mas/yr

Galactic Cartesian (pc)

x = -0.093 · y = -0.677 · z = -0.730

Equatorial (J2000)

RA 262.17005° · Dec -46.89898°

Galactic ℓ, b

343.002° · -6.782°

Ecliptic λ, β

264.165° · -23.618°

HTM-20 index

-1086280568

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