Key parameters at a glance

A radius of 12.10 Earth radii
A mass of 6,935.33 Earth masses
Surface gravity around 47.37 g
An orbital period of 17,132.159 days
Semi-major axis 12.5180 AU
Distance from Earth 138.71 light-years
Earth Similarity Index 0.282
Travel time at Voyager 1 speed 2,446,103 years

HD 109988 b Planet Profile

Physical Specs

Radius

12.10 R⊕

Radius (Jupiter)

1.080 R♃

Mass

6,935.33 M⊕

Mass (Jupiter)

21.821 M♃

Density

21.50 g/cm³

Surface Gravity

47.37 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.282

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1454of 1771

top 82.0%

This planet

12.10R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 62364 b 12.10 R⊕ HD 106515 A b 12.10 R⊕ BD+20 2457 b 12.10 R⊕

Metric	Earth	HD 109988 b	Jupiter
Radius (R⊕)	1.00	12.10	11.21
Mass (M⊕)	1.00	6,935.33	317.83
Density (g/cm³)	5.51	21.50	1.33
Surface Gravity (g)	1.00	47.37	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	6,935.334 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 109988

TIC

TIC 389315309

Gaia DR2

Gaia DR2 6160221740968692992

Gaia DR3

Gaia DR3 6160221740968692992

System

HD 109988

Percentile among Gas Giant cohort

Radius 12.100 R⊕ · percentile 16 / cohort 1771

Mass 6,935.334 M⊕ · percentile 98 / cohort 1747

Orbital period 17,132.16 d · percentile 97 / cohort 1533

Distance 42.53 pc · percentile 16 / cohort 1759

ESI 0.282 · percentile 53 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

17,132.159 days

Semi-major axis

12.5180 AU

Eccentricity

0.056

Inclination

33.99 °

Year Length

A year here lasts about 46.91 Earth years on a nearly circular orbit at a mean orbital distance of 12.5180 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.282

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Feng et al. 2022

Instrument

Multiple Instruments

Publication

2022-09

Observation locale

Ground

Discovery cohort

Planets confirmed in 2022 at Multiple Observatories (12 shown).

Kepler-138 e · Rocky Terrestrial HD 93351 b · Super-Earth GJ 1002 b · Rocky Terrestrial GJ 2030 b · Sub-Neptune GJ 3929 c · Sub-Neptune HD 217786 c · Sub-Neptune GJ 1002 c · Rocky Terrestrial HD 155918 b · Sub-Neptune HD 213519 b · Sub-Neptune HD 191939 g · Sub-Neptune GJ 514 b · Sub-Neptune HD 12235 b · Sub-Neptune

Host System: HD 109988

Spectral Class

K-type orange

Effective Temperature

5,186 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.870 R☉

Stellar Mass

0.880 M☉

Metallicity [Fe/H]

0.14

Extended Stellar Properties

Surface gravity (log g)

4.504 dex

Stellar density

1.886 g/cm³

Metallicity ratio

[M/H]

Distance

42.53 parsec

Light-years 138.71 ly

V-band magnitude

8.90 mag

Voyager-speed travel 2,446,103 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

23.485 mas

Total Proper Motion

77.708 mas/yr

PM Right Ascension

-42.79 mas/yr

PM Declination

-64.86 mas/yr

Galactic Cartesian (pc)

x = -0.829 · y = -0.143 · z = -0.541

Equatorial (J2000)

RA 189.81547° · Dec -32.72636°

Galactic ℓ, b

299.973° · 30.075°

Ecliptic λ, β

202.689° · -26.038°

HTM-20 index

502862516

Similar Worlds

HD 184010 b

Gas Giant · K-type orange

Radius 12.10 R⊕ · 198.3 ly

tau Gem b

Gas Giant · K-type orange

Radius 12.10 R⊕ · 367.0 ly

KIC 3526061 b

Gas Giant · K-type orange

Radius 12.10 R⊕ · 1,308.6 ly

HIP 948 b

Gas Giant · K-type orange

Radius 12.10 R⊕ · 113.7 ly

BD+20 2457 b

Gas Giant · K-type orange

Radius 12.10 R⊕ · 5,021.9 ly

HD 139357 b

Gas Giant · K-type orange

Radius 12.10 R⊕ · 365.6 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Multiple Observatories Mission K-type orange Hosts