Key parameters at a glance

A radius of 4.12 Earth radii
A mass of 15.89 Earth masses
Surface gravity around 0.94 g
An orbital period of 21.858 days
Semi-major axis 0.1670 AU
Distance from Earth 157.37 light-years
Earth Similarity Index 0.535
Travel time at Voyager 1 speed 2,775,167 years

1 sibling around HD 156098

HD 156098 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 156098 b this	Neptune-like	4.12	15.89	21.858	—	2022
HD 156098 c	Gas Giant	12.80	1,661.61	7,841.584	—	2022

HD 156098 b Planet Profile

Physical Specs

Radius

4.12 R⊕

Radius (Jupiter)

0.368 R♃

Mass

15.89 M⊕

Mass (Jupiter)

0.050 M♃

Density

1.25 g/cm³

Surface Gravity

0.94 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.535

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#542of 574

top 94.3%

This planet

4.12R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

HD 4308 b 4.12 R⊕ HD 77338 b 4.12 R⊕ Kepler-1799 b 4.13 R⊕

Metric	Earth	HD 156098 b	Jupiter
Radius (R⊕)	1.00	4.12	11.21
Mass (M⊕)	1.00	15.89	317.83
Density (g/cm³)	5.51	1.25	1.33
Surface Gravity (g)	1.00	0.94	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	15.891 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 156098

TIC

TIC 152449405

Gaia DR2

Gaia DR2 5979460655025099776

Gaia DR3

Gaia DR3 5979460655025099776

System

HD 156098

Percentile among Neptune-like cohort

Radius 4.120 R⊕ · percentile 5 / cohort 574

Mass 15.891 M⊕ · percentile 11 / cohort 574

Orbital period 21.86 d · percentile 54 / cohort 524

Distance 48.25 pc · percentile 16 / cohort 572

ESI 0.535 · percentile 97 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

21.858 days

Semi-major axis

0.1670 AU

Eccentricity

0.109

Inclination

— °

Year Length

A year here lasts approximately 21.86 Earth days (6.0% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1670 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.535

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 156098

Spectral Class

F-type yellow-white

Effective Temperature

6,419 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

2.757 R☉

Stellar Mass

1.290 M☉

Metallicity [Fe/H]

0.12

Extended Stellar Properties

Surface gravity (log g)

3.668 dex

Stellar density

0.087 g/cm³

Metallicity ratio

[M/H]

Distance

48.25 parsec

Light-years 157.37 ly

V-band magnitude

5.53 mag

Voyager-speed travel 2,775,167 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

20.699 mas

Total Proper Motion

112.596 mas/yr

PM Right Ascension

-98.27 mas/yr

PM Declination

-54.96 mas/yr

Galactic Cartesian (pc)

x = -0.157 · y = -0.827 · z = -0.540

Equatorial (J2000)

RA 259.26469° · Dec -32.66308°

Galactic ℓ, b

353.520° · 3.084°

Ecliptic λ, β

260.846° · -9.564°

HTM-20 index

1402592621