Key parameters at a glance

A radius of 13.00 Earth radii
A mass of 1,271.31 Earth masses
Surface gravity around 7.52 g
Semi-major axis 118.0000 AU
Equilibrium temperature 1,450 K (1177 °C)
Distance from Earth 419.06 light-years
Earth Similarity Index 0.111
Travel time at Voyager 1 speed 7,390,092 years

2M0437 b Planet Profile

Physical Specs

Radius

13.00 R⊕

Radius (Jupiter)

1.160 R♃

Mass

1,271.31 M⊕

Mass (Jupiter)

4.000 M♃

Density

3.18 g/cm³

Surface Gravity

7.52 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.111

HZ Position Unknown

Controversial No

Discovery

Year 2021

Method Imaging

Facility Subaru Telescope

Telescope 8.2 m Subaru Telescope

Size rank in cohort

Rank by radius

#960of 1771

top 54.2%

This planet

13.00R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HIP 14810 b 13.00 R⊕ HD 47186 c 13.00 R⊕ WASP-107 c 13.00 R⊕

Metric	Earth	2M0437 b	Jupiter
Radius (R⊕)	1.00	13.00	11.21
Mass (M⊕)	1.00	1,271.31	317.83
Density (g/cm³)	5.51	3.18	1.33
Surface Gravity (g)	1.00	7.52	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,271.314 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 125843782

Gaia DR2

Gaia DR2 151499478104075008

Gaia DR3

Gaia DR3 151499478104075008

System

2MASS J04372171+2651014

Percentile among Gas Giant cohort

Radius 13.000 R⊕ · percentile 43 / cohort 1771

Mass 1,271.314 M⊕ · percentile 71 / cohort 1747

Distance 128.48 pc · percentile 40 / cohort 1759

ESI 0.111 · percentile 29 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

118.0000 AU

Eccentricity

—

Inclination

— °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

1,450K

(1177 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.111

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Discovery Paper

Primary reference

Gaidos et al. 2021

Instrument

Infrared Camera and Spectrograph (IRCS)

Publication

2021-10

Observation locale

Ground

Host System: 2MASS J04372171+2651014

Spectral Class

M-type red dwarf

Effective Temperature

3,100 K — cooler than the Sun (5,778 K)

Estimated Age

0.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.840 R☉

Stellar Mass

0.170 M☉

Metallicity [Fe/H]

0.01

Extended Stellar Properties

Surface gravity (log g)

4.500 dex

Stellar density

3.320 g/cm³

Systemic radial velocity

17.10 km/s

Rotational v·sin i

22.54 km/s

Rotation period

1.84 days

Metallicity ratio

[Fe/H]

Distance

128.48 parsec

Light-years 419.06 ly

V-band magnitude

16.19 mag

Voyager-speed travel 7,390,092 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

7.755 mas

Total Proper Motion

28.336 mas/yr

PM Right Ascension

8.63 mas/yr

PM Declination

-26.99 mas/yr

Galactic Cartesian (pc)

x = 0.315 · y = 0.835 · z = 0.452

Equatorial (J2000)

RA 69.34055° · Dec 26.85030°

Galactic ℓ, b

172.820° · -13.446°

Ecliptic λ, β

71.584° · 4.722°

HTM-20 index

-1070997625

Similar Worlds

RR Cae b

Gas Giant · M-type red dwarf

Radius 13.00 R⊕ · 69.1 ly

TOI-756 c

Gas Giant · M-type red dwarf

Radius 13.00 R⊕ · 281.1 ly

GJ 463 b

Gas Giant · M-type red dwarf

Radius 13.10 R⊕ · 59.9 ly

KMT-2018-BLG-1990L b

Gas Giant · M-type red dwarf

Radius 12.90 R⊕ · 3,153.9 ly

GJ 676 A b

Gas Giant · M-type red dwarf

Radius 12.80 R⊕ · 52.3 ly

HIP 12961 b

Gas Giant · M-type red dwarf

Radius 13.20 R⊕ · 76.2 ly

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