Key parameters at a glance

A radius of 14.20 Earth radii
A mass of 175.76 Earth masses
Surface gravity around 0.87 g
An orbital period of 308.921 days
Semi-major axis 0.8820 AU
Distance from Earth 203.56 light-years
Earth Similarity Index 0.260
Travel time at Voyager 1 speed 3,589,743 years

1 sibling around HD 43197

HD 43197 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 43197 b this	Gas Giant	14.20	175.76	308.921	—	2010
HD 43197 c	Gas Giant	12.60	2,500.67	9,295.974	—	2022

HD 43197 b Planet Profile

Physical Specs

Radius

14.20 R⊕

Radius (Jupiter)

1.260 R♃

Mass

175.76 M⊕

Mass (Jupiter)

0.553 M♃

Density

0.34 g/cm³

Surface Gravity

0.87 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.260

HZ Position Unknown

Controversial No

Discovery

Year 2010

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#334of 1771

top 18.8%

This planet

14.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

OGLE-2011-BLG-0251L b 14.20 R⊕ HIP 57274 c 14.20 R⊕ HD 187123 b 14.20 R⊕

Metric	Earth	HD 43197 b	Jupiter
Radius (R⊕)	1.00	14.20	11.21
Mass (M⊕)	1.00	175.76	317.83
Density (g/cm³)	5.51	0.34	1.33
Surface Gravity (g)	1.00	0.87	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	175.759 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 43197

HIP

HIP 29550

TIC

TIC 37660988

Gaia DR2

Gaia DR2 2896745747966986240

Gaia DR3

Gaia DR3 2896745747966986240

System

HD 43197

Percentile among Gas Giant cohort

Radius 14.200 R⊕ · percentile 79 / cohort 1771

Mass 175.759 M⊕ · percentile 16 / cohort 1747

Orbital period 308.92 d · percentile 61 / cohort 1533

Distance 62.41 pc · percentile 26 / cohort 1759

ESI 0.260 · percentile 48 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

308.921 days

Semi-major axis

0.8820 AU

Eccentricity

0.742

Inclination

— °

Year Length

A year here lasts approximately 308.92 Earth days (84.6% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.8820 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.260

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Naef et al. 2010

Instrument

HARPS Spectrograph

Publication

2010-11

Observation locale

Ground

Discovery cohort

Planets confirmed in 2010 at La Silla Observatory (12 shown).

GJ 3634 b · Sub-Neptune HD 10180 f · Neptune-like HD 10180 e · Neptune-like GJ 676 A b · Gas Giant HD 204313 b · Gas Giant HD 28254 b · Gas Giant HD 1690 b · Gas Giant HD 10180 h · Neptune-like HD 113538 c · Gas Giant HD 25171 b · Gas Giant HD 8535 b · Gas Giant HD 44219 b · Gas Giant

Host System: HD 43197

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,508 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.000 R☉

Stellar Mass

0.960 M☉

Metallicity [Fe/H]

0.40

Extended Stellar Properties

Surface gravity (log g)

4.310 dex

Stellar density

1.120 g/cm³

Systemic radial velocity

72.51 km/s

Rotational v·sin i

2.18 km/s

Metallicity ratio

[Fe/H]

Distance

62.41 parsec

Light-years 203.56 ly

V-band magnitude

8.98 mag

Voyager-speed travel 3,589,743 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

15.994 mas

Total Proper Motion

148.516 mas/yr

PM Right Ascension

147.59 mas/yr

PM Declination

16.60 mas/yr

Galactic Cartesian (pc)

x = -0.051 · y = 0.865 · z = -0.498

Equatorial (J2000)

RA 93.39932° · Dec -29.89719°

Galactic ℓ, b

236.815° · -20.738°

Ecliptic λ, β

94.928° · -53.278°

HTM-20 index

-938185275