Key parameters at a glance

A radius of 12.10 Earth radii
A mass of 5,943.39 Earth masses
Surface gravity around 40.59 g
An orbital period of 2,342.600 days
Semi-major axis 3.5400 AU
Distance from Earth 187.30 light-years
Earth Similarity Index 0.300
Travel time at Voyager 1 speed 3,303,023 years

HD 165131 b Planet Profile

Physical Specs

Radius

12.10 R⊕

Radius (Jupiter)

1.080 R♃

Mass

5,943.39 M⊕

Mass (Jupiter)

18.700 M♃

Density

18.40 g/cm³

Surface Gravity

40.59 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.300

HZ Position Unknown

Controversial No

Discovery

Year 2023

Method Radial Velocity

Facility Multiple Facilities

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1454of 1771

top 82.0%

This planet

12.10R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 62364 b 12.10 R⊕ HD 106515 A b 12.10 R⊕ BD+20 2457 b 12.10 R⊕

Metric	Earth	HD 165131 b	Jupiter
Radius (R⊕)	1.00	12.10	11.21
Mass (M⊕)	1.00	5,943.39	317.83
Density (g/cm³)	5.51	18.40	1.33
Surface Gravity (g)	1.00	40.59	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	5,943.391 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	5,581.067 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 165131

HIP

HIP 88595

TIC

TIC 105138916

Gaia DR2

Gaia DR2 4070009007975710464

Gaia DR3

Gaia DR3 4070009007975710464

System

HD 165131

Percentile among Gas Giant cohort

Radius 12.100 R⊕ · percentile 16 / cohort 1771

Mass 5,943.391 M⊕ · percentile 96 / cohort 1747

Orbital period 2,342.60 d · percentile 86 / cohort 1533

Distance 57.43 pc · percentile 24 / cohort 1759

ESI 0.300 · percentile 58 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2,342.600 days

Semi-major axis

3.5400 AU

Eccentricity

0.671

Inclination

70.00 °

Year Length

A year here lasts about 6.41 Earth years on a highly eccentric trajectory at a mean orbital distance of 3.5400 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.300

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

Xiao et al. 2023

Instrument

Multiple Instruments

Publication

2023-05

Observation locale

Multiple Locales

Discovery cohort

Planets confirmed in 2023 at Multiple Facilities (3 shown).

GJ 1151 c · Sub-Neptune HD 89839 b · Gas Giant HD 167677 b · Gas Giant

Host System: HD 165131

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,870 K — hotter than the Sun (5,778 K)

Estimated Age

2.70 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.064 R☉

Stellar Mass

1.060 M☉

Metallicity [Fe/H]

0.06

Extended Stellar Properties

Surface gravity (log g)

4.390 dex

Stellar density

1.240 g/cm³

Rotational v·sin i

2.30 km/s

Activity index (log R'HK)

-4.980

Metallicity ratio

[Fe/H]

Distance

57.43 parsec

Light-years 187.30 ly

V-band magnitude

8.42 mag

Voyager-speed travel 3,303,023 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

17.385 mas

Total Proper Motion

138.852 mas/yr

PM Right Ascension

-62.06 mas/yr

PM Declination

-124.21 mas/yr

Galactic Cartesian (pc)

x = 0.022 · y = -0.929 · z = -0.369

Equatorial (J2000)

RA 271.34440° · Dec -21.67370°

Galactic ℓ, b

8.521° · -0.189°

Ecliptic λ, β

271.246° · 1.760°

HTM-20 index

200230246