Key parameters at a glance

A radius of 13.30 Earth radii
A mass of 767.24 Earth masses
Surface gravity around 4.34 g
An orbital period of 437.700 days
Semi-major axis 1.3200 AU
Distance from Earth 537.32 light-years
Earth Similarity Index 0.380
Travel time at Voyager 1 speed 9,475,566 years

HD 108863 b Planet Profile

Physical Specs

Radius

13.30 R⊕

Radius (Jupiter)

1.180 R♃

Mass

767.24 M⊕

Mass (Jupiter)

2.414 M♃

Density

1.79 g/cm³

Surface Gravity

4.34 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.380

HZ Position Unknown

Controversial No

Discovery

Year 2011

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#793of 1771

top 44.7%

This planet

13.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 12661 b 13.30 R⊕ HD 129445 b 13.30 R⊕ GJ 876 b 13.30 R⊕

Metric	Earth	HD 108863 b	Jupiter
Radius (R⊕)	1.00	13.30	11.21
Mass (M⊕)	1.00	767.24	317.83
Density (g/cm³)	5.51	1.79	1.33
Surface Gravity (g)	1.00	4.34	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	767.242 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 108863

HIP

HIP 61020

TIC

TIC 371621400

Gaia DR2

Gaia DR2 3952692457305436800

Gaia DR3

Gaia DR3 3952692457305436800

System

HD 108863

Percentile among Gas Giant cohort

Radius 13.300 R⊕ · percentile 53 / cohort 1771

Mass 767.242 M⊕ · percentile 60 / cohort 1747

Orbital period 437.70 d · percentile 65 / cohort 1533

Distance 164.74 pc · percentile 46 / cohort 1759

ESI 0.380 · percentile 79 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

437.700 days

Semi-major axis

1.3200 AU

Eccentricity

0.032

Inclination

— °

Year Length

A year here lasts about 1.20 Earth years on a nearly circular orbit at a mean orbital distance of 1.3200 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.380

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Johnson et al. 2011

Instrument

HIRES Spectrometer

Publication

2011-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2011 at W. M. Keck Observatory (12 shown).

HD 5891 b · Gas Giant HD 102329 b · Gas Giant HD 18742 b · Gas Giant HD 142245 b · Gas Giant CFBDSIR J145829+101343 b · Gas Giant HD 1502 b · Gas Giant HD 82886 b · Gas Giant HD 106270 b · Gas Giant HD 98219 b · Gas Giant HD 152581 b · Gas Giant HD 131496 b · Gas Giant HD 30856 b · Gas Giant

Host System: HD 108863

Spectral Class

K-type orange

Effective Temperature

4,878 K — cooler than the Sun (5,778 K)

Estimated Age

1.80 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

5.740 R☉

Stellar Mass

1.590 M☉

Metallicity [Fe/H]

0.20

Extended Stellar Properties

Surface gravity (log g)

3.070 dex

Systemic radial velocity

-27.85 km/s

Rotational v·sin i

1.06 km/s

Metallicity ratio

[Fe/H]

Distance

164.74 parsec

Light-years 537.32 ly

V-band magnitude

7.71 mag

Voyager-speed travel 9,475,566 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

6.042 mas

Total Proper Motion

82.668 mas/yr

PM Right Ascension

-75.50 mas/yr

PM Declination

-33.67 mas/yr

Galactic Cartesian (pc)

x = -0.919 · y = -0.122 · z = 0.374

Equatorial (J2000)

RA 187.58261° · Dec 21.94810°

Galactic ℓ, b

258.984° · 82.940°

Ecliptic λ, β

177.730° · 23.055°

HTM-20 index

1246191169

Similar Worlds

TOI-4010 e

Gas Giant · K-type orange

Radius 13.30 R⊕ · 578.9 ly

HD 94890 b

Gas Giant · K-type orange

Radius 13.30 R⊕ · 201.2 ly

NGC 2682 Sand 978 b

Gas Giant · K-type orange

Radius 13.30 R⊕ · 2,680.7 ly

HD 12661 b

Gas Giant · K-type orange

Radius 13.30 R⊕ · 123.4 ly

Kepler-432 c

Gas Giant · K-type orange

Radius 13.30 R⊕ · 2,765.9 ly

HD 108341 b

Gas Giant · K-type orange

Radius 13.30 R⊕ · 159.5 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries W. M. Keck Observatory Mission K-type orange Hosts