Key parameters at a glance

A radius of 13.90 Earth radii
A mass of 124.59 Earth masses
Surface gravity around 0.64 g
An orbital period of 25.338 days
Semi-major axis 0.1770 AU
Distance from Earth 282.50 light-years
Earth Similarity Index 0.245
Travel time at Voyager 1 speed 4,981,939 years

HD 205158 b Planet Profile

Physical Specs

Radius

13.90 R⊕

Radius (Jupiter)

1.240 R♃

Mass

124.59 M⊕

Mass (Jupiter)

0.392 M♃

Density

0.26 g/cm³

Surface Gravity

0.64 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.245

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#456of 1771

top 25.7%

This planet

13.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

24 Sex c 13.90 R⊕ HD 148156 b 13.90 R⊕ HD 134987 c 13.90 R⊕

Metric	Earth	HD 205158 b	Jupiter
Radius (R⊕)	1.00	13.90	11.21
Mass (M⊕)	1.00	124.59	317.83
Density (g/cm³)	5.51	0.26	1.33
Surface Gravity (g)	1.00	0.64	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	124.589 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 205158

TIC

TIC 316830331

Gaia DR2

Gaia DR2 6458219559945150336

Gaia DR3

Gaia DR3 6458219559946927872

System

HD 205158

Percentile among Gas Giant cohort

Radius 13.900 R⊕ · percentile 72 / cohort 1771

Mass 124.589 M⊕ · percentile 8 / cohort 1747

Orbital period 25.34 d · percentile 49 / cohort 1533

Distance 86.62 pc · percentile 32 / cohort 1759

ESI 0.245 · percentile 43 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

25.338 days

Semi-major axis

0.1770 AU

Eccentricity

0.145

Inclination

— °

Year Length

A year here lasts approximately 25.34 Earth days (6.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1770 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.245

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Feng et al. 2022

Instrument

Multiple Instruments

Publication

2022-09

Observation locale

Ground

Discovery cohort

Planets confirmed in 2022 at Multiple Observatories (12 shown).

Kepler-138 e · Rocky Terrestrial HD 93351 b · Super-Earth GJ 1002 b · Rocky Terrestrial GJ 2030 b · Sub-Neptune GJ 3929 c · Sub-Neptune HD 217786 c · Sub-Neptune GJ 1002 c · Rocky Terrestrial HD 155918 b · Sub-Neptune HD 213519 b · Sub-Neptune HD 191939 g · Sub-Neptune GJ 514 b · Sub-Neptune HD 12235 b · Sub-Neptune

Host System: HD 205158

Spectral Class

F-type yellow-white

Effective Temperature

6,134 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.877 R☉

Stellar Mass

1.160 M☉

Metallicity [Fe/H]

—

Distance

86.62 parsec

Light-years 282.50 ly

V-band magnitude

7.84 mag

Voyager-speed travel 4,981,939 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

11.517 mas

Total Proper Motion

35.294 mas/yr

PM Right Ascension

-23.06 mas/yr

PM Declination

-26.72 mas/yr

Galactic Cartesian (pc)

x = 0.408 · y = -0.297 · z = -0.863

Equatorial (J2000)

RA 323.91862° · Dec -59.69331°

Galactic ℓ, b

334.585° · -43.524°

Ecliptic λ, β

303.500° · -42.367°

HTM-20 index

1225574280