Key parameters at a glance

A radius of 12.40 Earth radii
A mass of 3,496.11 Earth masses
Surface gravity around 22.74 g
Semi-major axis 12,000.0000 AU
Distance from Earth 67.86 light-years
Earth Similarity Index 0.370
Travel time at Voyager 1 speed 1,196,740 years

GJ 900 b Planet Profile

Physical Specs

Radius

12.40 R⊕

Radius (Jupiter)

1.110 R♃

Mass

3,496.11 M⊕

Mass (Jupiter)

11.000 M♃

Density

10.10 g/cm³

Surface Gravity

22.74 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.370

HZ Position Unknown

Controversial No

Discovery

Year 2024

Method Imaging

Facility Multiple Observatories

Telescope Multiple Telescopes

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	GJ 900 b	Jupiter
Radius (R⊕)	1.00	12.40	11.21
Mass (M⊕)	1.00	3,496.11	317.83
Density (g/cm³)	5.51	10.10	1.33
Surface Gravity (g)	1.00	22.74	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	3,496.112 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HIP

HIP 116384

TIC

TIC 422618003

Gaia DR2

Gaia DR2 2646280705713202816

Gaia DR3

Gaia DR3 2646280705713202816

System

GJ 900

Percentile among Gas Giant cohort

Radius 12.400 R⊕ · percentile 25 / cohort 1771

Mass 3,496.112 M⊕ · percentile 89 / cohort 1747

Distance 20.81 pc · percentile 4 / cohort 1759

ESI 0.370 · percentile 77 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

12,000.0000 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)

0.370

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Rothermich et al. 2024

Instrument

Multiple Instruments

Publication

2024-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2024 at Multiple Observatories (12 shown).

HD 134606 e · Super-Earth Kepler-51 e · Sub-Neptune HD 134606 f · Sub-Neptune HD 134606 b · Sub-Neptune Teegarden's Star d · Rocky Terrestrial HD 134606 c · Sub-Neptune HD 104067 c · Sub-Neptune GJ 1289 b · Sub-Neptune TOI-4562 c · Gas Giant HD 222237 b · Gas Giant CI Tau c · Gas Giant HD 75898 c · Gas Giant

Host System: GJ 900 A

Spectral Class

K-type orange

Effective Temperature

3,976 K — cooler than the Sun (5,778 K)

Estimated Age

0.20 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.716 R☉

Stellar Mass

1.080 M☉

Metallicity [Fe/H]

-0.63

Extended Stellar Properties

Surface gravity (log g)

4.557 dex

Stellar density

2.590 g/cm³

Systemic radial velocity

-10.44 km/s

Rotation period

11.90 days

Metallicity ratio

[Fe/H]

Distance

20.81 parsec

Light-years 67.86 ly

V-band magnitude

9.59 mag

Voyager-speed travel 1,196,740 yr

Multi-band Host Photometry — 8 bands

Astrometric Data

Parallax

48.033 mas

Total Proper Motion

340.992 mas/yr

PM Right Ascension

339.80 mas/yr

PM Declination

28.52 mas/yr

Galactic Cartesian (pc)

x = 0.994 · y = -0.109 · z = 0.028

Equatorial (J2000)

RA 353.75262° · Dec 1.60552°

Galactic ℓ, b

87.249° · -55.879°

Ecliptic λ, β

354.898° · 3.955°

HTM-20 index

1559295788

Similar Worlds

HD 87816 c

Gas Giant · K-type orange

Radius 12.40 R⊕ · 434.5 ly

HD 95127 b

Gas Giant · K-type orange

Radius 12.40 R⊕ · 2,206.7 ly

HD 16905 b

Gas Giant · K-type orange

Radius 12.40 R⊕ · 129.6 ly

Gaia-4 b

Gas Giant · K-type orange

Radius 12.40 R⊕ · 239.7 ly

HD 110014 b

Gas Giant · K-type orange

Radius 12.40 R⊕ · 328.6 ly

TYC 4282-00605-1 b

Gas Giant · K-type orange

Radius 12.40 R⊕ · 1,513.8 ly

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