Key parameters at a glance

A radius of 14.01 Earth radii
A mass of 1,906.98 Earth masses
Surface gravity around 9.71 g
Semi-major axis 1,100.0000 AU
Distance from Earth 37.54 light-years
Earth Similarity Index 0.413
Travel time at Voyager 1 speed 661,993 years

brightness_6

Circumbinary planet

Ross 458 c orbits a binary-star pair rather than a single host — a minority architecture in the confirmed catalogue.

Ross 458 c Planet Profile

Physical Specs

Radius

14.01 R⊕

Radius (Jupiter)

1.250 R♃

Mass

1,906.98 M⊕

Mass (Jupiter)

6.000 M♃

Density

3.81 g/cm³

Surface Gravity

9.71 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.413

HZ Position Unknown

Controversial No

Discovery

Year 2010

Method Imaging

Facility Las Campanas Observatory

Telescope 6.5 m Magellan I Baade Telescope

Size rank in cohort

Rank by radius

#408of 1771

top 23.0%

This planet

14.01R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

WASP-185 b 14.01 R⊕ XO-4 b 14.01 R⊕ TOI-4465 b 14.01 R⊕

Metric	Earth	Ross 458 c	Jupiter
Radius (R⊕)	1.00	14.01	11.21
Mass (M⊕)	1.00	1,906.98	317.83
Density (g/cm³)	5.51	3.81	1.33
Surface Gravity (g)	1.00	9.71	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,906.980 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HIP

HIP 63510

TIC

TIC 88138162

Gaia DR2

Gaia DR2 3737308025028857600

Gaia DR3

Gaia DR3 3737308025029348608

System

Ross 458

Percentile among Gas Giant cohort

Radius 14.011 R⊕ · percentile 77 / cohort 1771

Mass 1,906.980 M⊕ · percentile 79 / cohort 1747

Distance 11.51 pc · percentile 1 / cohort 1759

ESI 0.413 · percentile 89 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

1,100.0000 AU

Eccentricity

—

Inclination

— °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.413

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Burgasser et al. 2010

Instrument

FIRE Spectrograph

Publication

2010-12

Observation locale

Ground

Host System: Ross 458

Spectral Class

M-type red dwarf

Effective Temperature

3,965 K — cooler than the Sun (5,778 K)

Estimated Age

0.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.563 R☉

Stellar Mass

0.556 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.683 dex

Stellar density

4.406 g/cm³

Systemic radial velocity

-11.20 km/s

Rotation period

1.54 days

Distance

11.51 parsec

Light-years 37.54 ly

V-band magnitude

9.76 mag

Voyager-speed travel 661,993 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

86.857 mas

Total Proper Motion

633.176 mas/yr

PM Right Ascension

-632.15 mas/yr

PM Declination

-36.02 mas/yr

Galactic Cartesian (pc)

x = -0.943 · y = -0.256 · z = 0.214

Equatorial (J2000)

RA 195.19121° · Dec 12.37560°

Galactic ℓ, b

311.815° · 75.086°

Ecliptic λ, β

189.013° · 17.364°

HTM-20 index

1842820423

Observation Record

Photometric series

Stellar spectra

Archive notes

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