Key parameters at a glance

A radius of 13.70 Earth radii
A mass of 381.39 Earth masses
Surface gravity around 2.03 g
An orbital period of 2,266.400 days
Semi-major axis 3.3960 AU
Distance from Earth 152.89 light-years
Earth Similarity Index 0.323
Travel time at Voyager 1 speed 2,696,299 years

HD 220689 b Planet Profile

Physical Specs

Radius

13.70 R⊕

Radius (Jupiter)

1.220 R♃

Mass

381.39 M⊕

Mass (Jupiter)

1.200 M♃

Density

0.82 g/cm³

Surface Gravity

2.03 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.323

HZ Position Unknown

Controversial No

Discovery

Year 2012

Method Radial Velocity

Facility La Silla Observatory

Telescope 1.2 m Leonhard Euler Telescope

Size rank in cohort

Rank by radius

#554of 1771

top 31.2%

This planet

13.70R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 148164 b 13.70 R⊕ HD 114783 b 13.70 R⊕ HD 159243 b 13.70 R⊕

Metric	Earth	HD 220689 b	Jupiter
Radius (R⊕)	1.00	13.70	11.21
Mass (M⊕)	1.00	381.39	317.83
Density (g/cm³)	5.51	0.82	1.33
Surface Gravity (g)	1.00	2.03	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	381.394 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	355.334 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 220689

HIP

HIP 115662

TIC

TIC 9156146

Gaia DR2

Gaia DR2 2391838429257482496

Gaia DR3

Gaia DR3 2391838429257482496

System

HD 220689

Percentile among Gas Giant cohort

Radius 13.700 R⊕ · percentile 66 / cohort 1771

Mass 381.394 M⊕ · percentile 40 / cohort 1747

Orbital period 2,266.40 d · percentile 86 / cohort 1533

Distance 46.88 pc · percentile 18 / cohort 1759

ESI 0.323 · percentile 64 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2,266.400 days

Semi-major axis

3.3960 AU

Eccentricity

0.054

Inclination

71.00 °

Year Length

A year here lasts about 6.21 Earth years on a nearly circular orbit at a mean orbital distance of 3.3960 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.323

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

Marmier et al. 2013

Instrument

CORALIE Spectrograph

Publication

2013-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2012 at La Silla Observatory (11 shown).

GJ 676 A d · Super-Earth GJ 667 C b · Sub-Neptune GJ 676 A e · Sub-Neptune HD 77338 b · Neptune-like HD 166724 b · Gas Giant HD 219077 b · Gas Giant HD 98649 b · Gas Giant HD 196067 b · Gas Giant HD 27631 b · Gas Giant GJ 3470 b · Neptune-like HD 106515 A b · Gas Giant

Host System: HD 220689

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,921 K — hotter than the Sun (5,778 K)

Estimated Age

4.59 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.068 R☉

Stellar Mass

1.016 M☉

Metallicity [Fe/H]

-0.07

Extended Stellar Properties

Surface gravity (log g)

4.360 dex

Stellar density

0.975 g/cm³

Systemic radial velocity

12.19 km/s

Rotational v·sin i

2.30 km/s

Rotation period

29.00 days

Metallicity ratio

[Fe/H]

Distance

46.88 parsec

Light-years 152.89 ly

V-band magnitude

7.74 mag

Voyager-speed travel 2,696,299 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

21.303 mas

Total Proper Motion

178.189 mas/yr

PM Right Ascension

-15.74 mas/yr

PM Declination

-177.49 mas/yr

Galactic Cartesian (pc)

x = 0.926 · y = -0.139 · z = -0.352

Equatorial (J2000)

RA 351.47073° · Dec -20.61679°

Galactic ℓ, b

46.759° · -69.419°

Ecliptic λ, β

343.881° · -15.536°

HTM-20 index

1776307132