Key parameters at a glance

A radius of 12.90 Earth radii
A mass of 1,598.68 Earth masses
Surface gravity around 9.61 g
An orbital period of 1,143.599 days
Semi-major axis 2.4060 AU
Distance from Earth 204.55 light-years
Earth Similarity Index 0.429
Travel time at Voyager 1 speed 3,607,194 years

HD 190228 b Planet Profile

Physical Specs

Radius

12.90 R⊕

Radius (Jupiter)

1.150 R♃

Mass

1,598.68 M⊕

Mass (Jupiter)

5.030 M♃

Density

4.09 g/cm³

Surface Gravity

9.61 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.429

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1011of 1771

top 57.0%

This planet

12.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 55696 b 12.90 R⊕ HD 24040 b 12.90 R⊕ BD-210397 c 12.90 R⊕

Metric	Earth	HD 190228 b	Jupiter
Radius (R⊕)	1.00	12.90	11.21
Mass (M⊕)	1.00	1,598.68	317.83
Density (g/cm³)	5.51	4.09	1.33
Surface Gravity (g)	1.00	9.61	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,598.677 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	1,449.298 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 190228

HIP

HIP 98714

TIC

TIC 117905020

Gaia DR2

Gaia DR2 2029001447540053504

Gaia DR3

Gaia DR3 2029001447540053504

System

HD 190228

Percentile among Gas Giant cohort

Radius 12.900 R⊕ · percentile 41 / cohort 1771

Mass 1,598.677 M⊕ · percentile 75 / cohort 1747

Orbital period 1,143.60 d · percentile 79 / cohort 1533

Distance 62.71 pc · percentile 26 / cohort 1759

ESI 0.429 · percentile 94 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,143.599 days

Semi-major axis

2.4060 AU

Eccentricity

0.559

Inclination

94.99 °

Year Length

A year here lasts about 3.13 Earth years on a highly eccentric trajectory at a mean orbital distance of 2.4060 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.429

0 = alien, 1 = Earth-identical

Detection Signatures

Radial velocity

Stellar wobble has been measured spectroscopically.

Astrometry

Positional wobble of the host star was measured.

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 190228

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,360 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

2.587 R☉

Stellar Mass

1.415 M☉

Metallicity [Fe/H]

-0.24

Distance

62.71 parsec

Light-years 204.55 ly

V-band magnitude

7.30 mag

Voyager-speed travel 3,607,194 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

15.916 mas

Total Proper Motion

125.377 mas/yr

PM Right Ascension

104.15 mas/yr

PM Declination

-69.81 mas/yr

Galactic Cartesian (pc)

x = 0.450 · y = -0.757 · z = 0.474

Equatorial (J2000)

RA 300.75373° · Dec 28.30656°

Galactic ℓ, b

65.993° · -1.406°

Ecliptic λ, β

311.682° · 47.394°

HTM-20 index

-1004426064