Key parameters at a glance

A radius of 13.40 Earth radii
A mass of 581.63 Earth masses
Surface gravity around 3.24 g
An orbital period of 3,999.000 days
Semi-major axis 5.1400 AU
Distance from Earth 165.06 light-years
Earth Similarity Index 0.359
Travel time at Voyager 1 speed 2,910,840 years

HD 222155 b Planet Profile

Physical Specs

Radius

13.40 R⊕

Radius (Jupiter)

1.200 R♃

Mass

581.63 M⊕

Mass (Jupiter)

1.830 M♃

Density

1.33 g/cm³

Surface Gravity

3.24 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.359

HZ Position Unknown

Controversial No

Discovery

Year 2011

Method Radial Velocity

Facility Haute-Provence Observatory

Telescope 1.93 m Telescope

Size rank in cohort

Rank by radius

#730of 1771

top 41.2%

This planet

13.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 114783 c 13.40 R⊕ HIP 79431 b 13.40 R⊕ HD 68988 b 13.40 R⊕

Metric	Earth	HD 222155 b	Jupiter
Radius (R⊕)	1.00	13.40	11.21
Mass (M⊕)	1.00	581.63	317.83
Density (g/cm³)	5.51	1.33	1.33
Surface Gravity (g)	1.00	3.24	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	581.626 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	673.800 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 222155

HIP

HIP 116616

TIC

TIC 26370518

Gaia DR2

Gaia DR2 1943363751009454976

Gaia DR3

Gaia DR3 1943363751009454976

System

HD 222155

Percentile among Gas Giant cohort

Radius 13.400 R⊕ · percentile 56 / cohort 1771

Mass 581.626 M⊕ · percentile 52 / cohort 1747

Orbital period 3,999.00 d · percentile 91 / cohort 1533

Distance 50.61 pc · percentile 20 / cohort 1759

ESI 0.359 · percentile 73 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

3,999.000 days

Semi-major axis

5.1400 AU

Eccentricity

0.160

Inclination

68.00 °

Year Length

A year here lasts about 10.95 Earth years on a mildly elliptical path at a mean orbital distance of 5.1400 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.359

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

Boisse et al. 2012

Instrument

ELODIE Spectrograph

Publication

2012-09

Observation locale

Ground

Discovery cohort

Planets confirmed in 2011 at Haute-Provence Observatory (2 shown).

HD 156279 b · Gas Giant HD 22781 b · Gas Giant

Host System: HD 222155

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,701 K — cooler than the Sun (5,778 K)

Estimated Age

8.20 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.850 R☉

Stellar Mass

1.210 M☉

Metallicity [Fe/H]

-0.18

Extended Stellar Properties

Surface gravity (log g)

3.990 dex

Stellar density

0.244 g/cm³

Systemic radial velocity

-43.99 km/s

Rotational v·sin i

3.20 km/s

Metallicity ratio

[Fe/H]

Distance

50.61 parsec

Light-years 165.06 ly

V-band magnitude

7.12 mag

Voyager-speed travel 2,910,840 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

19.731 mas

Total Proper Motion

227.801 mas/yr

PM Right Ascension

195.30 mas/yr

PM Declination

-117.27 mas/yr

Galactic Cartesian (pc)

x = 0.653 · y = -0.063 · z = 0.755

Equatorial (J2000)

RA 354.50256° · Dec 48.99602°

Galactic ℓ, b

110.730° · -12.128°

Ecliptic λ, β

20.368° · 45.840°

HTM-20 index

-1429038531