Key parameters at a glance

A radius of 12.11 Earth radii
A mass of 1,271.30 Earth masses
Surface gravity around 8.67 g
Semi-major axis 43.5000 AU
Equilibrium temperature 510 K (237 °C)
Distance from Earth 57.17 light-years
Earth Similarity Index 0.342
Travel time at Voyager 1 speed 1,008,278 years

GJ 504 b Planet Profile

Physical Specs

Radius

12.11 R⊕

Radius (Jupiter)

1.080 R♃

Mass

1,271.30 M⊕

Mass (Jupiter)

4.000 M♃

Density

3.94 g/cm³

Surface Gravity

8.67 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.342

HZ Position Unknown

Controversial No

Discovery

Year 2013

Method Imaging

Facility Subaru Telescope

Telescope 8.2 m Subaru Telescope

Size rank in cohort

Rank by radius

#1451of 1771

top 81.9%

This planet

12.11R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-2589 b 12.11 R⊕ WASP-106 b 12.11 R⊕ WASP-10 b 12.11 R⊕

Metric	Earth	GJ 504 b	Jupiter
Radius (R⊕)	1.00	12.11	11.21
Mass (M⊕)	1.00	1,271.30	317.83
Density (g/cm³)	5.51	3.94	1.33
Surface Gravity (g)	1.00	8.67	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,271.300 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 115383

HIP

HIP 64792

TIC

TIC 397587084

Gaia DR2

Gaia DR2 3732539683617410816

Gaia DR3

Gaia DR3 3732539683617410816

System

GJ 504

Percentile among Gas Giant cohort

Radius 12.106 R⊕ · percentile 18 / cohort 1771

Mass 1,271.300 M⊕ · percentile 71 / cohort 1747

Distance 17.53 pc · percentile 3 / cohort 1759

ESI 0.342 · percentile 69 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

43.5000 AU

Eccentricity

—

Inclination

— °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

510K

(237 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.342

0 = alien, 1 = Earth-identical

Insufficient insolation data — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Kuzuhara et al. 2013

Instrument

HiCIAO Camera

Publication

2013-09

Observation locale

Ground

Host System: GJ 504

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

6,234 K — hotter than the Sun (5,778 K)

Estimated Age

0.16 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.260 R☉

Stellar Mass

1.220 M☉

Metallicity [Fe/H]

0.28

Extended Stellar Properties

Surface gravity (log g)

4.600 dex

Stellar density

0.639 g/cm³

Systemic radial velocity

-27.40 km/s

Rotational v·sin i

5.47 km/s

Rotation period

3.33 days

Activity index (log R'HK)

-4.400

Metallicity ratio

[Fe/H]

Distance

17.53 parsec

Light-years 57.17 ly

V-band magnitude

5.19 mag

Voyager-speed travel 1,008,278 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

57.019 mas

Total Proper Motion

386.863 mas/yr

PM Right Ascension

-336.66 mas/yr

PM Declination

190.58 mas/yr

Galactic Cartesian (pc)

x = -0.932 · y = -0.324 · z = 0.164

Equatorial (J2000)

RA 199.19235° · Dec 9.42498°

Galactic ℓ, b

322.787° · 71.314°

Ecliptic λ, β

194.003° · 16.215°

HTM-20 index

831787870

Observation Record

Photometric series

RV measurements

Archive notes