Key parameters at a glance

A radius of 12.90 Earth radii
A mass of 1,466.78 Earth masses
Surface gravity around 8.81 g
An orbital period of 2,041.115 days
Semi-major axis 3.1850 AU
Distance from Earth 155.88 light-years
Earth Similarity Index 0.425
Travel time at Voyager 1 speed 2,749,025 years

Context from the literature

HD 204313 b is an extrasolar planet which orbits the G-type main sequence star HD 204313, located approximately 155 light years away in the constellation Capricorn. This planet orbits the star at a distance of 3.082 astronomical units and takes 1931 days or 5.29 years to revolve around the star. It has a minimum mass four times that of Jupiter. However the radius is not known since this planet was not detected by the transit method or direct imaging. Instead, this planet was detected by the radial velocity method using the CORALIE Echelle spectrograph mounted on the 1.2 meter Euler Swiss Telescope located at La Silla Observatory in Atacama Desert, Chile on August 11, 2009.

Excerpted from Wikipedia · full article

2 siblings around HD 204313

HD 204313 b shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 204313 c	Neptune-like	4.31	17.16	34.959	—	2015
HD 204313 b this	Gas Giant	12.90	1,466.78	2,041.115	—	2010
HD 204313 e	Gas Giant	12.20	4,868.18	7,325.647	—	2022

HD 204313 b Planet Profile

Physical Specs

Radius

12.90 R⊕

Radius (Jupiter)

1.150 R♃

Mass

1,466.78 M⊕

Mass (Jupiter)

4.615 M♃

Density

3.75 g/cm³

Surface Gravity

8.81 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.425

HZ Position Unknown

Controversial No

Discovery

Year 2010

Method Radial Velocity

Facility La Silla Observatory

Telescope 1.2 m Leonhard Euler Telescope

Size rank in cohort

Rank by radius

#1011of 1771

top 57.0%

This planet

12.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 55696 b 12.90 R⊕ HD 24040 b 12.90 R⊕ BD-210397 c 12.90 R⊕

Metric	Earth	HD 204313 b	Jupiter
Radius (R⊕)	1.00	12.90	11.21
Mass (M⊕)	1.00	1,466.78	317.83
Density (g/cm³)	5.51	3.75	1.33
Surface Gravity (g)	1.00	8.81	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,466.778 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	1,417.515 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 204313

HIP

HIP 106006

TIC

TIC 99734092

Gaia DR2

Gaia DR2 6828450688663428224

Gaia DR3

Gaia DR3 6828450688663428224

System

HD 204313

Percentile among Gas Giant cohort

Radius 12.900 R⊕ · percentile 41 / cohort 1771

Mass 1,466.778 M⊕ · percentile 74 / cohort 1747

Orbital period 2,041.12 d · percentile 85 / cohort 1533

Distance 47.79 pc · percentile 18 / cohort 1759

ESI 0.425 · percentile 93 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2,041.115 days

Semi-major axis

3.1850 AU

Eccentricity

0.100

Inclination

72.92 °

Year Length

A year here lasts about 5.59 Earth years on a mildly elliptical path at a mean orbital distance of 3.1850 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.425

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

Segransan et al. 2010

Instrument

CORALIE Spectrograph

Publication

2010-02

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 28254 b · Gas Giant HD 1690 b · Gas Giant HD 10180 h · Neptune-like HD 113538 c · Gas Giant HD 25171 b · Gas Giant HD 8535 b · Gas Giant HD 44219 b · Gas Giant HD 43197 b · Gas Giant

Host System: HD 204313

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,767 K — cooler than the Sun (5,778 K)

Estimated Age

3.38 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.100 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

0.18

Extended Stellar Properties

Surface gravity (log g)

4.370 dex

Stellar density

1.015 g/cm³

Systemic radial velocity

-9.74 km/s

Rotational v·sin i

2.40 km/s

Metallicity ratio

[Fe/H]

Distance

47.79 parsec

Light-years 155.88 ly

V-band magnitude

7.99 mag

Voyager-speed travel 2,749,025 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

20.894 mas

Total Proper Motion

273.881 mas/yr

PM Right Ascension

42.76 mas/yr

PM Declination

-270.52 mas/yr

Galactic Cartesian (pc)

x = 0.733 · y = -0.571 · z = -0.370

Equatorial (J2000)

RA 322.05106° · Dec -21.72742°

Galactic ℓ, b

28.026° · -43.729°

Ecliptic λ, β

317.490° · -6.454°

HTM-20 index

-522785699

Observation Record

Photometric series

RV measurements

Archive notes

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