Key parameters at a glance

A radius of 11.90 Earth radii
A mass of 9,333.03 Earth masses
Surface gravity around 65.91 g
An orbital period of 14,583.810 days
Semi-major axis 12.0270 AU
Distance from Earth 209.85 light-years
Earth Similarity Index 0.247
Travel time at Voyager 1 speed 3,700,677 years

HD 188641 b Planet Profile

Physical Specs

Radius

11.90 R⊕

Radius (Jupiter)

1.060 R♃

Mass

9,333.03 M⊕

Mass (Jupiter)

29.365 M♃

Density

30.40 g/cm³

Surface Gravity

65.91 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.247

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1526of 1771

top 86.1%

This planet

11.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

2MASS J22501512+2325342 b 11.90 R⊕ KMT-2020-BLG-0414L c 11.90 R⊕ DENIS-P J082303.1-491201 b 11.90 R⊕

Metric	Earth	HD 188641 b	Jupiter
Radius (R⊕)	1.00	11.90	11.21
Mass (M⊕)	1.00	9,333.03	317.83
Density (g/cm³)	5.51	30.40	1.33
Surface Gravity (g)	1.00	65.91	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	9,333.031 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 188641

TIC

TIC 300611942

Gaia DR2

Gaia DR2 6691193566928966528

Gaia DR3

Gaia DR3 6691193566928966528

System

HD 188641

Percentile among Gas Giant cohort

Radius 11.900 R⊕ · percentile 13 / cohort 1771

Mass 9,333.031 M⊕ · percentile 100 / cohort 1747

Orbital period 14,583.81 d · percentile 97 / cohort 1533

Distance 64.34 pc · percentile 27 / cohort 1759

ESI 0.247 · percentile 44 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

14,583.810 days

Semi-major axis

12.0270 AU

Eccentricity

0.034

Inclination

49.25 °

Year Length

A year here lasts about 39.93 Earth years on a nearly circular orbit at a mean orbital distance of 12.0270 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.247

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 188641

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,897 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.945 R☉

Stellar Mass

1.070 M☉

Metallicity [Fe/H]

-0.08

Extended Stellar Properties

Surface gravity (log g)

3.890 dex

Stellar density

0.205 g/cm³

Metallicity ratio

[M/H]

Distance

64.34 parsec

Light-years 209.85 ly

V-band magnitude

7.34 mag

Voyager-speed travel 3,700,677 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

15.514 mas

Total Proper Motion

40.014 mas/yr

PM Right Ascension

7.21 mas/yr

PM Declination

39.36 mas/yr

Galactic Cartesian (pc)

x = 0.388 · y = -0.689 · z = -0.612

Equatorial (J2000)

RA 299.40483° · Dec -37.74488°

Galactic ℓ, b

2.678° · -28.655°

Ecliptic λ, β

293.910° · -16.715°

HTM-20 index

-695454891