Key parameters at a glance

A radius of 10.10 Earth radii
A mass of 73.10 Earth masses
Surface gravity around 0.72 g
An orbital period of 1,733.000 days
Semi-major axis 2.5500 AU
Distance from Earth 93.66 light-years
Earth Similarity Index 0.304
Travel time at Voyager 1 speed 1,651,704 years

HD 204941 b Planet Profile

Physical Specs

Radius

10.10 R⊕

Radius (Jupiter)

0.903 R♃

Mass

73.10 M⊕

Mass (Jupiter)

0.230 M♃

Density

0.39 g/cm³

Surface Gravity

0.72 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.304

HZ Position Unknown

Controversial No

Discovery

Year 2011

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#1759of 1771

top 99.3%

This planet

10.10R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 3651 b 10.10 R⊕ KMT-2018-BLG-0087L b 10.10 R⊕ TOI-216.01 10.10 R⊕

Metric	Earth	HD 204941 b	Jupiter
Radius (R⊕)	1.00	10.10	11.21
Mass (M⊕)	1.00	73.10	317.83
Density (g/cm³)	5.51	0.39	1.33
Surface Gravity (g)	1.00	0.72	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	73.101 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 204941

HIP

HIP 106353

TIC

TIC 99837626

Gaia DR2

Gaia DR2 6830027182179257472

Gaia DR3

Gaia DR3 6830027182179257472

System

HD 204941

Percentile among Gas Giant cohort

Radius 10.100 R⊕ · percentile 0 / cohort 1771

Mass 73.101 M⊕ · percentile 1 / cohort 1747

Orbital period 1,733.00 d · percentile 83 / cohort 1533

Distance 28.72 pc · percentile 7 / cohort 1759

ESI 0.304 · percentile 59 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,733.000 days

Semi-major axis

2.5500 AU

Eccentricity

0.370

Inclination

— °

Year Length

A year here lasts about 4.74 Earth years on a highly eccentric trajectory at a mean orbital distance of 2.5500 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.304

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Dumusque et al. 2011

Instrument

HARPS Spectrograph

Publication

2011-11

Observation locale

Ground

Discovery cohort

Planets confirmed in 2011 at La Silla Observatory (10 shown).

GJ 433 b · Sub-Neptune HD 20794 d · Sub-Neptune HD 192310 b · Neptune-like HD 20794 b · Super-Earth HD 7449 b · Gas Giant HD 192310 c · Neptune-like HD 217786 b · Gas Giant HIP 5158 c · Gas Giant HD 137388 b · Neptune-like HD 7199 b · Unclassified

Host System: HD 204941

Spectral Class

K-type orange

Effective Temperature

5,026 K — cooler than the Sun (5,778 K)

Estimated Age

6.67 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.780 R☉

Stellar Mass

0.580 M☉

Metallicity [Fe/H]

-0.19

Extended Stellar Properties

Surface gravity (log g)

4.420 dex

Stellar density

2.356 g/cm³

Systemic radial velocity

32.57 km/s

Metallicity ratio

[Fe/H]

Distance

28.72 parsec

Light-years 93.66 ly

V-band magnitude

8.45 mag

Voyager-speed travel 1,651,704 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

34.795 mas

Total Proper Motion

305.480 mas/yr

PM Right Ascension

-279.07 mas/yr

PM Declination

-124.24 mas/yr

Galactic Cartesian (pc)

x = 0.747 · y = -0.561 · z = -0.358

Equatorial (J2000)

RA 323.09667° · Dec -20.95796°

Galactic ℓ, b

29.458° · -44.423°

Ecliptic λ, β

318.665° · -6.034°

HTM-20 index

-356773852

Similar Worlds

HD 122562 c

Gas Giant · K-type orange

Radius 10.10 R⊕ · 173.7 ly

HD 3651 b

Gas Giant · K-type orange

Radius 10.10 R⊕ · 36.3 ly

TOI-216.01

Gas Giant · K-type orange

Radius 10.10 R⊕ · 580.4 ly

WASP-132 b

Gas Giant · K-type orange

Radius 10.10 R⊕ · 400.9 ly

CoRoT-29 b

Gas Giant · K-type orange

Radius 10.09 R⊕ · 2,630.5 ly

WASP-145 A b

Gas Giant · K-type orange

Radius 10.09 R⊕ · 297.8 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries La Silla Observatory Mission K-type orange Hosts