Confirmed Exoplanet Discovered 2013

ROXs 12 b

A gas giant orbiting the m-type red dwarf ROXs 12, located approximately 445.7 light-years from Earth.

Key parameters at a glance

  • A radius of 12.20 Earth radii
  • A mass of 5,085.00 Earth masses
  • Surface gravity around 34.16 g
  • Semi-major axis 210.0000 AU
  • Distance from Earth 445.69 light-years
  • Earth Similarity Index 0.320
  • Travel time at Voyager 1 speed 7,859,781 years

ROXs 12 b Planet Profile

Physical Specs

Radius
12.20 R⊕
Radius (Jupiter)
1.090 R♃
Mass
5,085.00 M⊕
Mass (Jupiter)
16.000 M♃
Density
15.40 g/cm³
Surface Gravity
34.16 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.320
HZ Position Unknown
Controversial No

Discovery

Year 2013
Method Imaging
Facility W. M. Keck Observatory
Telescope 10 m Keck II Telescope

Size rank in cohort

Rank by radius

#1410of 1771

top 79.6%

This planet

12.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

FU Tau b 12.20 R⊕ HD 168443 c 12.20 R⊕ HIP 5158 c 12.20 R⊕
Metric Earth ROXs 12 b Jupiter
Radius (R⊕)1.0012.2011.21
Mass (M⊕)1.005,085.00317.83
Density (g/cm³)5.5115.401.33
Surface Gravity (g)1.0034.162.53
Insolation (S⊕)1.00—0.037

Alternative Mass Estimates

Method Value Interpretation
Best measured mass 5,085.000 M⊕ Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 175595883

Gaia DR2

Gaia DR2 6048935358761628288

Gaia DR3

Gaia DR3 6048935358761628288

System

ROXs 12

Percentile among Gas Giant cohort

Radius 12.200 R⊕ · percentile 19 / cohort 1771
Mass 5,085.000 M⊕ · percentile 94 / cohort 1747
Distance 136.65 pc · percentile 42 / cohort 1759
ESI 0.320 · percentile 63 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period
— days
Semi-major axis
210.0000 AU
Eccentricity
0.830
Inclination
— °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

—

 

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.320

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Kraus et al. 2014

Instrument

NIRC2 Camera

Publication

2014-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2013 at W. M. Keck Observatory (2 shown).

Kepler-68 d · Gas Giant 2MASS J01225093-2439505 b · Gas Giant

Host System: ROXs 12

Spectral Class

M-type red dwarf

Effective Temperature

3,850 K — cooler than the Sun (5,778 K)

Estimated Age

0.01 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.066 R☉

Stellar Mass

0.870 M☉

Metallicity [Fe/H]

0.14

Extended Stellar Properties

Surface gravity (log g)

4.067 dex

Stellar density

0.563 g/cm³

Systemic radial velocity

-8.00 km/s

Rotational v·sin i

7.20 km/s

Metallicity ratio

[Fe/H]

Distance
136.65 parsec
Light-years 445.69 ly
V-band magnitude
14.76 mag
Voyager-speed travel 7,859,781 yr

Multi-band Host Photometry — 12 bands

6.616.216.17B14.76V13.27Gaia13.38Kepler12.19TESS10.28J9.39H9.10K8.81W18.71W28.39W36.56W4

Astrometric Data

Parallax

7.289 mas

Total Proper Motion

25.869 mas/yr

PM Right Ascension

-7.18 mas/yr

PM Declination

-24.85 mas/yr

Galactic Cartesian (pc)

x = -0.358 · y = -0.829 · z = -0.430

Equatorial (J2000)

RA 246.61680° · Dec -25.44670°

Galactic ℓ, b

352.258° · 16.212°

Ecliptic λ, β

248.950° · -3.700°

HTM-20 index

-721463855

Similar Worlds

HD 112300 b

Gas Giant · M-type red dwarf

Radius 12.20 R⊕ · 202.5 ly

HD 220074 b

Gas Giant · M-type red dwarf

Radius 12.20 R⊕ · 1,058.5 ly

FU Tau b

Gas Giant · M-type red dwarf

Radius 12.20 R⊕ · 435.4 ly

2MASS J03590986+2009361 b

Gas Giant · M-type red dwarf

Radius 12.20 R⊕ · 383.0 ly

KOINTREAU-4 b

Gas Giant · M-type red dwarf

Radius 12.20 R⊕ · 474.3 ly

USco1621 b

Gas Giant · M-type red dwarf

Radius 12.20 R⊕ · 449.8 ly

Explore Related Categories

Gas Giant Planets Imaging Discoveries W. M. Keck Observatory Mission M-type red dwarf Hosts