Key parameters at a glance

A radius of 12.50 Earth radii
A mass of 2,860.00 Earth masses
Surface gravity around 18.30 g
Semi-major axis 157.0000 AU
Equilibrium temperature 1,975 K (1702 °C)
Distance from Earth 468.33 light-years
Earth Similarity Index 0.074
Travel time at Voyager 1 speed 8,258,953 years

brightness_6

Circumbinary planet

ROXs 42 B b orbits a binary-star pair rather than a single host — a minority architecture in the confirmed catalogue.

ROXs 42 B b Planet Profile

Physical Specs

Radius

12.50 R⊕

Radius (Jupiter)

1.120 R♃

Mass

2,860.00 M⊕

Mass (Jupiter)

9.000 M♃

Density

8.05 g/cm³

Surface Gravity

18.30 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.074

HZ Position Unknown

Controversial No

Discovery

Year 2013

Method Imaging

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1235of 1771

top 69.7%

This planet

12.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 156279 c 12.50 R⊕ HD 33283 b 12.50 R⊕ HD 156279 b 12.50 R⊕

Metric	Earth	ROXs 42 B b	Jupiter
Radius (R⊕)	1.00	12.50	11.21
Mass (M⊕)	1.00	2,860.00	317.83
Density (g/cm³)	5.51	8.05	1.33
Surface Gravity (g)	1.00	18.30	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	2,860.000 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 318449007

Gaia DR2

Gaia DR2 6047587937321868288

Gaia DR3

Gaia DR3 6047587937321868288

System

ROXs 42

Percentile among Gas Giant cohort

Radius 12.500 R⊕ · percentile 28 / cohort 1771

Mass 2,860.000 M⊕ · percentile 85 / cohort 1747

Distance 143.59 pc · percentile 43 / cohort 1759

ESI 0.074 · percentile 15 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

157.0000 AU

Eccentricity

0.580

Inclination

— °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

1,975K

(1702 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.074

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Discovery Paper

Primary reference

Currie et al. 2014

Instrument

Multiple Instruments

Publication

2014-01

Observation locale

Ground

Host System: ROXs 42 B

Spectral Class

M-type red dwarf

Effective Temperature

3,433 K — cooler than the Sun (5,778 K)

Estimated Age

0.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.337 R☉

Stellar Mass

1.000 M☉

Metallicity [Fe/H]

—

Distance

143.59 parsec

Light-years 468.33 ly

V-band magnitude

14.66 mag

Voyager-speed travel 8,258,953 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

6.937 mas

Total Proper Motion

24.110 mas/yr

PM Right Ascension

-6.46 mas/yr

PM Declination

-23.23 mas/yr

Galactic Cartesian (pc)

x = -0.344 · y = -0.842 · z = -0.415

Equatorial (J2000)

RA 247.81255° · Dec -24.54558°

Galactic ℓ, b

353.707° · 15.990°

Ecliptic λ, β

249.883° · -2.642°

HTM-20 index

-1617133435

Similar Worlds

TYC 2187-512-1 b

Gas Giant · M-type red dwarf

Radius 12.50 R⊕ · 50.5 ly

HD 208527 b

Gas Giant · M-type red dwarf

Radius 12.50 R⊕ · 1,018.3 ly

Kepler-94 c

Gas Giant · M-type red dwarf

Radius 12.50 R⊕ · 625.9 ly

TOI-4666 b

Gas Giant · M-type red dwarf

Radius 12.53 R⊕ · 504.7 ly

COCONUTS-2 b

Gas Giant · M-type red dwarf

Radius 12.44 R⊕ · 35.5 ly

HIP 55507 b

Gas Giant · M-type red dwarf

Radius 12.60 R⊕ · 83.1 ly

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