Confirmed Exoplanet Discovered 2018

2MASS J0249-0557 c

A gas giant orbiting the m-type red dwarf 2MASS J0249-0557 A, located approximately 215.5 light-years from Earth.

Key parameters at a glance

  • A radius of 12.40 Earth radii
  • A mass of 3,686.81 Earth masses
  • Surface gravity around 23.98 g
  • Semi-major axis 1,950.0000 AU
  • Distance from Earth 215.46 light-years
  • Earth Similarity Index 0.363
  • Travel time at Voyager 1 speed 3,799,688 years
brightness_6

Circumbinary planet

2MASS J0249-0557 c orbits a binary-star pair rather than a single host — a minority architecture in the confirmed catalogue.

2MASS J0249-0557 c Planet Profile

Physical Specs

Radius
12.40 R⊕
Radius (Jupiter)
1.110 R♃
Mass
3,686.81 M⊕
Mass (Jupiter)
11.600 M♃
Density
10.60 g/cm³
Surface Gravity
23.98 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.363
HZ Position Unknown
Controversial No

Discovery

Year 2018
Method Imaging
Facility Mauna Kea Observatory
Telescope 3.58 m Canada-France-Hawaii Telescope (CFHT)

Size rank in cohort

Rank by radius

#1298of 1771

top 73.2%

This planet

12.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 110014 b 12.40 R⊕ CFBDSIR J145829+101343 b 12.40 R⊕ MOA-2010-BLG-073L b 12.40 R⊕
Metric Earth 2MASS J0249-0557 c Jupiter
Radius (R⊕)1.0012.4011.21
Mass (M⊕)1.003,686.81317.83
Density (g/cm³)5.5110.601.33
Surface Gravity (g)1.0023.982.53
Insolation (S⊕)1.00—0.037

Alternative Mass Estimates

Method Value Interpretation
Best measured mass 3,686.810 M⊕ Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 10930507

Gaia DR2

Gaia DR2 5183875103632956032

Gaia DR3

Gaia DR3 5183875103632956032

System

2MASS J0249-0557

Percentile among Gas Giant cohort

Radius 12.400 R⊕ · percentile 25 / cohort 1771
Mass 3,686.810 M⊕ · percentile 90 / cohort 1747
Distance 66.06 pc · percentile 27 / cohort 1759
ESI 0.363 · percentile 74 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period
— days
Semi-major axis
1,950.0000 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)

0.363

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Dupuy et al. 2018

Instrument

WIRCam

Publication

2018-08

Observation locale

Ground

Host System: 2MASS J0249-0557 A

Spectral Class

M-type red dwarf

Effective Temperature

2,859 K — cooler than the Sun (5,778 K)

Estimated Age

0.02 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.316 R☉

Stellar Mass

0.046 M☉

Metallicity [Fe/H]

—

Distance
66.06 parsec
Light-years 215.46 ly
V-band magnitude
18.30 mag
Voyager-speed travel 3,799,688 yr

Multi-band Host Photometry — 16 bands

8.921.521.47U18.27B18.30V15.69Gaia14.10TESS18.72Sloan g17.20Sloan r14.98Sloan i13.75Sloan z11.96J11.36H11.06K10.84W110.60W210.39W38.92W4

Astrometric Data

Parallax

15.110 mas

Total Proper Motion

60.631 mas/yr

PM Right Ascension

48.66 mas/yr

PM Declination

-36.17 mas/yr

Galactic Cartesian (pc)

x = 0.733 · y = 0.672 · z = -0.104

Equatorial (J2000)

RA 42.48516° · Dec -5.95999°

Galactic ℓ, b

181.387° · -54.767°

Ecliptic λ, β

38.091° · -21.252°

HTM-20 index

1154306385

Similar Worlds

DE CVn b

Gas Giant · M-type red dwarf

Radius 12.40 R⊕ · 99.6 ly

KOINTREAU-1 b

Gas Giant · M-type red dwarf

Radius 12.40 R⊕ · 517.3 ly

2MASS J21252752-8138278 b

Gas Giant · M-type red dwarf

Radius 12.40 R⊕ · 111.3 ly

COCONUTS-2 b

Gas Giant · M-type red dwarf

Radius 12.44 R⊕ · 35.5 ly

USco CTIO 108 b

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 469.7 ly

USco1556 b

Gas Giant · M-type red dwarf

Radius 12.30 R⊕ · 458.7 ly

Explore Related Categories

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