Key parameters at a glance

A radius of 13.90 Earth radii
A mass of 290.81 Earth masses
Surface gravity around 1.51 g
An orbital period of 1,802.290 days
Semi-major axis 2.9710 AU
Distance from Earth 181.39 light-years
Earth Similarity Index 0.300
Travel time at Voyager 1 speed 3,198,819 years

HD 25171 b Planet Profile

Physical Specs

Radius

13.90 R⊕

Radius (Jupiter)

1.240 R♃

Mass

290.81 M⊕

Mass (Jupiter)

0.915 M♃

Density

0.60 g/cm³

Surface Gravity

1.51 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.300

HZ Position Unknown

Controversial No

Discovery

Year 2010

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

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 25171 b	Jupiter
Radius (R⊕)	1.00	13.90	11.21
Mass (M⊕)	1.00	290.81	317.83
Density (g/cm³)	5.51	0.60	1.33
Surface Gravity (g)	1.00	1.51	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	290.814 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 25171

HIP

HIP 18387

TIC

TIC 237933846

Gaia DR2

Gaia DR2 4670023700215616768

Gaia DR3

Gaia DR3 4670023700215616768

System

HD 25171

Percentile among Gas Giant cohort

Radius 13.900 R⊕ · percentile 72 / cohort 1771

Mass 290.814 M⊕ · percentile 32 / cohort 1747

Orbital period 1,802.29 d · percentile 83 / cohort 1533

Distance 55.61 pc · percentile 23 / cohort 1759

ESI 0.300 · percentile 58 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,802.290 days

Semi-major axis

2.9710 AU

Eccentricity

0.042

Inclination

— °

Year Length

A year here lasts about 4.93 Earth years on a nearly circular orbit at a mean orbital distance of 2.9710 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.300

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Moutou et al. 2011

Instrument

HARPS Spectrograph

Publication

2011-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2010 at La Silla Observatory (12 shown).

GJ 3634 b · Sub-Neptune HD 10180 f · Neptune-like HD 10180 e · Neptune-like GJ 676 A b · Gas Giant HD 204313 b · Gas Giant HD 28254 b · Gas Giant HD 1690 b · Gas Giant HD 10180 h · Neptune-like HD 113538 c · Gas Giant HD 8535 b · Gas Giant HD 44219 b · Gas Giant HD 43197 b · Gas Giant

Host System: HD 25171

Spectral Class

F-type yellow-white

Effective Temperature

6,125 K — hotter than the Sun (5,778 K)

Estimated Age

4.80 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.230 R☉

Stellar Mass

1.076 M☉

Metallicity [Fe/H]

-0.12

Extended Stellar Properties

Surface gravity (log g)

4.263 dex

Stellar density

0.945 g/cm³

Systemic radial velocity

43.60 km/s

Rotational v·sin i

1.00 km/s

Rotation period

22.00 days

Metallicity ratio

[Fe/H]

Distance

55.61 parsec

Light-years 181.39 ly

V-band magnitude

7.77 mag

Voyager-speed travel 3,198,819 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

17.952 mas

Total Proper Motion

165.413 mas/yr

PM Right Ascension

143.94 mas/yr

PM Declination

81.50 mas/yr

Galactic Cartesian (pc)

x = 0.216 · y = 0.360 · z = -0.908

Equatorial (J2000)

RA 58.95748° · Dec -65.18632°

Galactic ℓ, b

278.805° · -42.290°

Ecliptic λ, β

351.803° · -77.371°

HTM-20 index

761694354