Key parameters at a glance

A radius of 12.40 Earth radii
A mass of 3,465.60 Earth masses
Surface gravity around 22.54 g
An orbital period of 14,901.993 days
Semi-major axis 10.8170 AU
Distance from Earth 128.33 light-years
Earth Similarity Index 0.371
Travel time at Voyager 1 speed 2,263,122 years

HD 125271 b Planet Profile

Physical Specs

Radius

12.40 R⊕

Radius (Jupiter)

1.110 R♃

Mass

3,465.60 M⊕

Mass (Jupiter)

10.904 M♃

Density

9.99 g/cm³

Surface Gravity

22.54 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.371

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1298of 1771

top 73.2%

This planet

12.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 110014 b 12.40 R⊕ CFBDSIR J145829+101343 b 12.40 R⊕ MOA-2010-BLG-073L b 12.40 R⊕

Metric	Earth	HD 125271 b	Jupiter
Radius (R⊕)	1.00	12.40	11.21
Mass (M⊕)	1.00	3,465.60	317.83
Density (g/cm³)	5.51	9.99	1.33
Surface Gravity (g)	1.00	22.54	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	3,465.601 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 125271

TIC

TIC 421255607

Gaia DR2

Gaia DR2 5772625505422769024

Gaia DR3

Gaia DR3 5772625505422769024

System

HD 125271

Percentile among Gas Giant cohort

Radius 12.400 R⊕ · percentile 25 / cohort 1771

Mass 3,465.601 M⊕ · percentile 89 / cohort 1747

Orbital period 14,901.99 d · percentile 97 / cohort 1533

Distance 39.35 pc · percentile 13 / cohort 1759

ESI 0.371 · percentile 77 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

14,901.993 days

Semi-major axis

10.8170 AU

Eccentricity

0.165

Inclination

93.09 °

Year Length

A year here lasts about 40.80 Earth years on a mildly elliptical path at a mean orbital distance of 10.8170 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.371

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 125271

Spectral Class

K-type orange

Effective Temperature

4,704 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.751 R☉

Stellar Mass

0.750 M☉

Metallicity [Fe/H]

-0.22

Extended Stellar Properties

Surface gravity (log g)

4.561 dex

Stellar density

2.493 g/cm³

Metallicity ratio

[M/H]

Distance

39.35 parsec

Light-years 128.33 ly

V-band magnitude

9.68 mag

Voyager-speed travel 2,263,122 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

25.386 mas

Total Proper Motion

227.696 mas/yr

PM Right Ascension

-40.40 mas/yr

PM Declination

-224.08 mas/yr

Galactic Cartesian (pc)

x = -0.119 · y = -0.089 · z = -0.989

Equatorial (J2000)

RA 216.64740° · Dec -81.45428°

Galactic ℓ, b

306.572° · -19.263°

Ecliptic λ, β

255.899° · -60.694°

HTM-20 index

1291660468

Similar Worlds

HD 87816 c

Gas Giant · K-type orange

Radius 12.40 R⊕ · 434.5 ly

HD 95127 b

Gas Giant · K-type orange

Radius 12.40 R⊕ · 2,206.7 ly

HD 16905 b

Gas Giant · K-type orange

Radius 12.40 R⊕ · 129.6 ly

Gaia-4 b

Gas Giant · K-type orange

Radius 12.40 R⊕ · 239.7 ly

HD 110014 b

Gas Giant · K-type orange

Radius 12.40 R⊕ · 328.6 ly

TYC 4282-00605-1 b

Gas Giant · K-type orange

Radius 12.40 R⊕ · 1,513.8 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Multiple Observatories Mission K-type orange Hosts