Key parameters at a glance

A radius of 13.50 Earth radii
A mass of 494.54 Earth masses
Surface gravity around 2.71 g
An orbital period of 637.100 days
Semi-major axis 1.5700 AU
Distance from Earth 395.97 light-years
Earth Similarity Index 0.345
Travel time at Voyager 1 speed 6,982,925 years

1 sibling around HD 5319

HD 5319 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 5319 b this	Gas Giant	13.50	494.54	637.100	—	2007
HD 5319 c	Gas Giant	13.80	334.67	872.200	—	2014

HD 5319 b Planet Profile

Physical Specs

Radius

13.50 R⊕

Radius (Jupiter)

1.210 R♃

Mass

494.54 M⊕

Mass (Jupiter)

1.556 M♃

Density

1.10 g/cm³

Surface Gravity

2.71 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.345

HZ Position Unknown

Controversial No

Discovery

Year 2007

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#671of 1771

top 37.8%

This planet

13.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 45350 b 13.50 R⊕ HD 82943 b 13.50 R⊕ HD 27442 b 13.50 R⊕

Metric	Earth	HD 5319 b	Jupiter
Radius (R⊕)	1.00	13.50	11.21
Mass (M⊕)	1.00	494.54	317.83
Density (g/cm³)	5.51	1.10	1.33
Surface Gravity (g)	1.00	2.71	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	494.543 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 5319

HIP

HIP 4297

TIC

TIC 344627954

Gaia DR2

Gaia DR2 2537319343919089024

Gaia DR3

Gaia DR3 2537319343919089024

System

HD 5319

Percentile among Gas Giant cohort

Radius 13.500 R⊕ · percentile 59 / cohort 1771

Mass 494.543 M⊕ · percentile 48 / cohort 1747

Orbital period 637.10 d · percentile 71 / cohort 1533

Distance 121.41 pc · percentile 39 / cohort 1759

ESI 0.345 · percentile 69 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

637.100 days

Semi-major axis

1.5700 AU

Eccentricity

0.092

Inclination

— °

Year Length

A year here lasts about 1.74 Earth years on a nearly circular orbit at a mean orbital distance of 1.5700 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.345

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Robinson et al. 2007

Instrument

HIRES Spectrometer

Publication

2007-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2007 at W. M. Keck Observatory (7 shown).

HD 11506 b · Gas Giant HD 125612 b · Gas Giant HD 75898 b · Gas Giant GJ 317 b · Gas Giant HD 231701 b · Gas Giant HD 170469 b · Gas Giant HD 175541 b · Gas Giant

Host System: HD 5319

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

4,871 K — cooler than the Sun (5,778 K)

Estimated Age

3.10 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

4.060 R☉

Stellar Mass

1.270 M☉

Metallicity [Fe/H]

0.15

Extended Stellar Properties

Surface gravity (log g)

3.260 dex

Systemic radial velocity

0.45 km/s

Rotational v·sin i

3.31 km/s

Metallicity ratio

[Fe/H]

Distance

121.41 parsec

Light-years 395.97 ly

V-band magnitude

8.05 mag

Voyager-speed travel 6,982,925 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

8.208 mas

Total Proper Motion

49.857 mas/yr

PM Right Ascension

-5.40 mas/yr

PM Declination

-49.56 mas/yr

Galactic Cartesian (pc)

x = 0.971 · y = 0.238 · z = 0.014

Equatorial (J2000)

RA 13.75581° · Dec 0.78934°

Galactic ℓ, b

124.846° · -62.069°

Ecliptic λ, β

12.962° · -4.700°

HTM-20 index

-293031071

Observation Record

Photometric series

RV measurements

Stellar spectra