Key parameters at a glance

A radius of 13.80 Earth radii
A mass of 314.65 Earth masses
Surface gravity around 1.65 g
An orbital period of 3,853.000 days
Semi-major axis 3.7000 AU
Distance from Earth 16.19 light-years
Earth Similarity Index 0.308
Travel time at Voyager 1 speed 285,538 years

GJ 832 b Planet Profile

Physical Specs

Radius

13.80 R⊕

Radius (Jupiter)

1.230 R♃

Mass

314.65 M⊕

Mass (Jupiter)

0.990 M♃

Density

0.66 g/cm³

Surface Gravity

1.65 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.308

HZ Position Unknown

Controversial No

Discovery

Year 2008

Method Radial Velocity

Facility Anglo-Australian Telescope

Telescope 3.9 m Anglo-Australian Telescope

Size rank in cohort

Rank by radius

#510of 1771

top 28.7%

This planet

13.80R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

GJ 179 b 13.80 R⊕ HD 219415 b 13.80 R⊕ BD+15 2375 b 13.80 R⊕

Metric	Earth	GJ 832 b	Jupiter
Radius (R⊕)	1.00	13.80	11.21
Mass (M⊕)	1.00	314.65	317.83
Density (g/cm³)	5.51	0.66	1.33
Surface Gravity (g)	1.00	1.65	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	314.650 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	197.046 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 204961

HIP

HIP 106440

TIC

TIC 139754153

Gaia DR2

Gaia DR2 6562924609150908416

Gaia DR3

Gaia DR3 6562924609150908416

System

GJ 832

Percentile among Gas Giant cohort

Radius 13.800 R⊕ · percentile 70 / cohort 1771

Mass 314.650 M⊕ · percentile 35 / cohort 1747

Orbital period 3,853.00 d · percentile 91 / cohort 1533

Distance 4.96 pc · percentile 0 / cohort 1759

ESI 0.308 · percentile 61 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3,853.000 days

Semi-major axis

3.7000 AU

Eccentricity

0.050

Inclination

51.00 °

Year Length

A year here lasts about 10.55 Earth years on a nearly circular orbit at a mean orbital distance of 3.7000 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.308

0 = alien, 1 = Earth-identical

Detection Signatures

Radial velocity

Stellar wobble has been measured spectroscopically.

Astrometry

Positional wobble of the host star was measured.

Discovery Paper

Primary reference

Bailey et al. 2009

Instrument

UCLES Spectrograph

Publication

2009-01

Observation locale

Ground

Host System: GJ 832

Spectral Class

M-type red dwarf

Effective Temperature

3,472 K — cooler than the Sun (5,778 K)

Estimated Age

8.10 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.442 R☉

Stellar Mass

0.450 M☉

Metallicity [Fe/H]

-0.30

Extended Stellar Properties

Surface gravity (log g)

4.789 dex

Stellar density

7.164 g/cm³

Systemic radial velocity

12.52 km/s

Rotational v·sin i

2.10 km/s

Activity index (log R'HK)

-5.180

Metallicity ratio

[Fe/H]

Distance

4.96 parsec

Light-years 16.19 ly

V-band magnitude

8.66 mag

Voyager-speed travel 285,538 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

201.407 mas

Total Proper Motion

817.889 mas/yr

PM Right Ascension

-45.83 mas/yr

PM Declination

-816.60 mas/yr

Galactic Cartesian (pc)

x = 0.527 · y = -0.391 · z = -0.755

Equatorial (J2000)

RA 323.39126° · Dec -49.01252°

Galactic ℓ, b

349.168° · -46.349°

Ecliptic λ, β

308.614° · -32.478°

HTM-20 index

2019929926

Observation Record

Photometric series

RV measurements

Archive notes

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Radius 13.80 R⊕ · 40.3 ly

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GJ 849 b

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