Key parameters at a glance

A radius of 13.40 Earth radii
A mass of 612.46 Earth masses
Surface gravity around 3.41 g
An orbital period of 356.210 days
Semi-major axis 1.1570 AU
Distance from Earth 444.58 light-years
Earth Similarity Index 0.363
Travel time at Voyager 1 speed 7,840,110 years

HD 4313 b Planet Profile

Physical Specs

Radius

13.40 R⊕

Radius (Jupiter)

1.200 R♃

Mass

612.46 M⊕

Mass (Jupiter)

1.927 M♃

Density

1.40 g/cm³

Surface Gravity

3.41 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.363

HZ Position Unknown

Controversial No

Discovery

Year 2009

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#730of 1771

top 41.2%

This planet

13.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 114783 c 13.40 R⊕ HIP 79431 b 13.40 R⊕ HD 68988 b 13.40 R⊕

Metric	Earth	HD 4313 b	Jupiter
Radius (R⊕)	1.00	13.40	11.21
Mass (M⊕)	1.00	612.46	317.83
Density (g/cm³)	5.51	1.40	1.33
Surface Gravity (g)	1.00	3.41	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	612.458 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 4313

HIP

HIP 3574

TIC

TIC 405228516

Gaia DR2

Gaia DR2 2557541493057378048

Gaia DR3

Gaia DR3 2557541493057378048

System

HD 4313

Percentile among Gas Giant cohort

Radius 13.400 R⊕ · percentile 56 / cohort 1771

Mass 612.458 M⊕ · percentile 54 / cohort 1747

Orbital period 356.21 d · percentile 62 / cohort 1533

Distance 136.31 pc · percentile 42 / cohort 1759

ESI 0.363 · percentile 74 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

356.210 days

Semi-major axis

1.1570 AU

Eccentricity

0.147

Inclination

— °

Year Length

A year here lasts approximately 356.21 Earth days (97.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 1.1570 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.363

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Johnson et al. 2010

Instrument

HIRES Spectrometer

Publication

2010-05

Observation locale

Ground

Discovery cohort

Planets confirmed in 2009 at W. M. Keck Observatory (12 shown).

HD 13931 b · Gas Giant HAT-P-13 c · Gas Giant HD 181342 b · Gas Giant HD 212771 b · Gas Giant HD 136418 b · Gas Giant HIP 79431 b · Gas Giant HD 206610 b · Gas Giant HD 180902 b · Gas Giant HD 95089 b · Gas Giant GJ 179 b · Gas Giant HD 34445 b · Gas Giant GJ 649 b · Gas Giant

Host System: HD 4313

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

4,943 K — cooler than the Sun (5,778 K)

Estimated Age

2.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

5.140 R☉

Stellar Mass

1.630 M☉

Metallicity [Fe/H]

0.14

Extended Stellar Properties

Surface gravity (log g)

3.240 dex

Systemic radial velocity

14.67 km/s

Rotational v·sin i

1.91 km/s

Metallicity ratio

[Fe/H]

Distance

136.31 parsec

Light-years 444.58 ly

V-band magnitude

7.83 mag

Voyager-speed travel 7,840,110 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

7.309 mas

Total Proper Motion

9.094 mas/yr

PM Right Ascension

-6.07 mas/yr

PM Declination

6.77 mas/yr

Galactic Cartesian (pc)

x = 0.971 · y = 0.196 · z = 0.136

Equatorial (J2000)

RA 11.41813° · Dec 7.84505°

Galactic ℓ, b

120.442° · -54.999°

Ecliptic λ, β

13.558° · 2.707°

HTM-20 index

-1726932441

Observation Record

Photometric series

RV measurements

Stellar spectra