Key parameters at a glance

A radius of 9.32 Earth radii
A mass of 63.57 Earth masses
Surface gravity around 0.73 g
An orbital period of 1,728.000 days
Semi-major axis 2.7290 AU
Distance from Earth 210.08 light-years
Earth Similarity Index 0.320
Travel time at Voyager 1 speed 3,704,767 years

HD 220197 b Planet Profile

Physical Specs

Radius

9.32 R⊕

Radius (Jupiter)

0.832 R♃

Mass

63.57 M⊕

Mass (Jupiter)

0.200 M♃

Density

0.43 g/cm³

Surface Gravity

0.73 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.320

HZ Position Unknown

Controversial No

Discovery

Year 2018

Method Radial Velocity

Facility Roque de los Muchachos Observatory

Telescope 3.58 m Telescopio Nazionale Galileo

Size rank in cohort

Rank by radius

#55of 574

top 9.4%

This planet

9.32R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

HD 33142 d 9.32 R⊕ HD 137388 b 9.32 R⊕ HD 218566 b 9.32 R⊕

Metric	Earth	HD 220197 b	Jupiter
Radius (R⊕)	1.00	9.32	11.21
Mass (M⊕)	1.00	63.57	317.83
Density (g/cm³)	5.51	0.43	1.33
Surface Gravity (g)	1.00	0.73	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	63.566 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 220197

HIP

HIP 115359

TIC

TIC 435199076

Gaia DR2

Gaia DR2 2817634821194781824

Gaia DR3

Gaia DR3 2817634821194781824

System

HD 220197

Percentile among Neptune-like cohort

Radius 9.320 R⊕ · percentile 90 / cohort 574

Mass 63.566 M⊕ · percentile 81 / cohort 574

Orbital period 1,728.00 d · percentile 99 / cohort 524

Distance 64.41 pc · percentile 19 / cohort 572

ESI 0.320 · percentile 55 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

1,728.000 days

Semi-major axis

2.7290 AU

Eccentricity

0.187

Inclination

— °

Year Length

A year here lasts about 4.73 Earth years on a mildly elliptical path at a mean orbital distance of 2.7290 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.320

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Barbato et al. 2019

Instrument

HARPS-N Spectrograph

Publication

2019-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2018 at Roque de los Muchachos Observatory (3 shown).

Gl 686 b · Sub-Neptune GJ 15 A c · Neptune-like HD 233832 b · Gas Giant

Host System: HD 220197

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,683 K — cooler than the Sun (5,778 K)

Estimated Age

10.16 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.980 R☉

Stellar Mass

0.910 M☉

Metallicity [Fe/H]

-0.55

Extended Stellar Properties

Surface gravity (log g)

4.420 dex

Stellar density

1.306 g/cm³

Systemic radial velocity

-40.39 km/s

Rotational v·sin i

1.50 km/s

Rotation period

19.00 days

Metallicity ratio

[Fe/H]

Distance

64.41 parsec

Light-years 210.08 ly

V-band magnitude

8.92 mag

Voyager-speed travel 3,704,767 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

15.497 mas

Total Proper Motion

410.098 mas/yr

PM Right Ascension

407.25 mas/yr

PM Declination

-48.26 mas/yr

Galactic Cartesian (pc)

x = 0.945 · y = -0.158 · z = 0.286

Equatorial (J2000)

RA 350.49469° · Dec 16.63233°

Galactic ℓ, b

93.971° · -41.155°

Ecliptic λ, β

358.098° · 18.999°

HTM-20 index

-851264719