Key parameters at a glance

A radius of 12.44 Earth radii
A mass of 2,542.63 Earth masses
Surface gravity around 16.42 g
An orbital period of 402,000,000.000 days
Semi-major axis 7,506.0000 AU
Equilibrium temperature 434 K (161 °C)
Distance from Earth 35.51 light-years
Earth Similarity Index 0.375
Travel time at Voyager 1 speed 626,160 years

COCONUTS-2 b Planet Profile

Physical Specs

Radius

12.44 R⊕

Radius (Jupiter)

1.110 R♃

Mass

2,542.63 M⊕

Mass (Jupiter)

8.000 M♃

Density

7.25 g/cm³

Surface Gravity

16.42 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.375

HZ Position Unknown

Controversial No

Discovery

Year 2021

Method Imaging

Facility NASA Infrared Telescope Facility (IRTF)

Telescope 3.2 m telescope

Size rank in cohort

Rank by radius

#1293of 1771

top 73.0%

This planet

12.44R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

TOI-4791 b 12.44 R⊕ WASP-11 b 12.44 R⊕ HR 2562 b 12.44 R⊕

Metric	Earth	COCONUTS-2 b	Jupiter
Radius (R⊕)	1.00	12.44	11.21
Mass (M⊕)	1.00	2,542.63	317.83
Density (g/cm³)	5.51	7.25	1.33
Surface Gravity (g)	1.00	16.42	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	2,542.627 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 272232401

Gaia DR2

Gaia DR2 5213167330349528064

Gaia DR3

Gaia DR3 5213167330349528064

System

COCONUTS-2

Percentile among Gas Giant cohort

Radius 12.442 R⊕ · percentile 27 / cohort 1771

Mass 2,542.627 M⊕ · percentile 83 / cohort 1747

Orbital period 402,000,000.00 d · percentile 100 / cohort 1533

Distance 10.89 pc · percentile 1 / cohort 1759

ESI 0.375 · percentile 78 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

402,000,000.000 days

Semi-major axis

7,506.0000 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts about 1100616.02 Earth years at a mean orbital distance of 7506.0000 AU.

Eq. Temperature

434K

(161 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.375

0 = alien, 1 = Earth-identical

Insufficient insolation data — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Zhang et al. 2021

Instrument

SpeX

Publication

2021-08

Observation locale

Ground

Host System: COCONUTS-2 A

Spectral Class

M-type red dwarf

Effective Temperature

3,406 K — cooler than the Sun (5,778 K)

Estimated Age

0.47 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.388 R☉

Stellar Mass

0.370 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.830 dex

Stellar density

9.139 g/cm³

Rotation period

2.83 days

Metallicity ratio

[Fe/H]

Distance

10.89 parsec

Light-years 35.51 ly

V-band magnitude

11.30 mag

Voyager-speed travel 626,160 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

91.829 mas

Total Proper Motion

218.529 mas/yr

PM Right Ascension

-102.00 mas/yr

PM Declination

-193.27 mas/yr

Galactic Cartesian (pc)

x = -0.105 · y = 0.204 · z = -0.973

Equatorial (J2000)

RA 117.30091° · Dec -76.70270°

Galactic ℓ, b

288.916° · -23.123°

Ecliptic λ, β

242.138° · -76.953°

HTM-20 index

-2105330316

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