Key parameters at a glance

A radius of 13.00 Earth radii
A mass of 111.42 Earth masses
Surface gravity around 0.66 g
An orbital period of 1,353.600 days
Semi-major axis 2.3950 AU
Distance from Earth 122.17 light-years
Earth Similarity Index 0.256
Travel time at Voyager 1 speed 2,154,460 years

1 sibling around HD 47186

HD 47186 c 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 47186 b	Neptune-like	5.02	22.25	4.085	—	2008
HD 47186 c this	Gas Giant	13.00	111.42	1,353.600	—	2008

HD 47186 c Planet Profile

Physical Specs

Radius

13.00 R⊕

Radius (Jupiter)

1.160 R♃

Mass

111.42 M⊕

Mass (Jupiter)

0.351 M♃

Density

0.28 g/cm³

Surface Gravity

0.66 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.256

HZ Position Unknown

Controversial No

Discovery

Year 2008

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#960of 1771

top 54.2%

This planet

13.00R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 1605 c 13.00 R⊕ HIP 14810 b 13.00 R⊕ WASP-107 c 13.00 R⊕

Metric	Earth	HD 47186 c	Jupiter
Radius (R⊕)	1.00	13.00	11.21
Mass (M⊕)	1.00	111.42	317.83
Density (g/cm³)	5.51	0.28	1.33
Surface Gravity (g)	1.00	0.66	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	111.420 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 47186

HIP

HIP 31540

TIC

TIC 101145648

Gaia DR2

Gaia DR2 2919760965879179136

Gaia DR3

Gaia DR3 2919760965880144384

System

HD 47186

Percentile among Gas Giant cohort

Radius 13.000 R⊕ · percentile 43 / cohort 1771

Mass 111.420 M⊕ · percentile 7 / cohort 1747

Orbital period 1,353.60 d · percentile 81 / cohort 1533

Distance 37.46 pc · percentile 12 / cohort 1759

ESI 0.256 · percentile 46 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,353.600 days

Semi-major axis

2.3950 AU

Eccentricity

0.249

Inclination

— °

Year Length

A year here lasts about 3.71 Earth years on a mildly elliptical path at a mean orbital distance of 2.3950 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.256

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Bouchy et al. 2009

Instrument

HARPS Spectrograph

Publication

2009-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2008 at La Silla Observatory (12 shown).

HD 285968 b · Sub-Neptune HD 47186 b · Neptune-like HD 145377 b · Gas Giant BD-17 63 b · Gas Giant HD 73267 b · Gas Giant HD 153950 b · Gas Giant HD 181433 d · Gas Giant HD 60532 c · Gas Giant HD 45364 b · Neptune-like HD 20868 b · Gas Giant HD 60532 b · Gas Giant HD 45364 c · Gas Giant

Host System: HD 47186

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,657 K — cooler than the Sun (5,778 K)

Estimated Age

6.50 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.080 R☉

Stellar Mass

0.960 M☉

Metallicity [Fe/H]

0.24

Extended Stellar Properties

Surface gravity (log g)

4.360 dex

Stellar density

1.057 g/cm³

Systemic radial velocity

4.30 km/s

Rotational v·sin i

2.20 km/s

Metallicity ratio

[Fe/H]

Distance

37.46 parsec

Light-years 122.17 ly

V-band magnitude

7.63 mag

Voyager-speed travel 2,154,460 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

26.668 mas

Total Proper Motion

263.833 mas/yr

PM Right Ascension

21.59 mas/yr

PM Declination

-262.95 mas/yr

Galactic Cartesian (pc)

x = -0.139 · y = 0.875 · z = -0.464

Equatorial (J2000)

RA 99.03672° · Dec -27.62343°

Galactic ℓ, b

236.504° · -15.307°

Ecliptic λ, β

102.679° · -50.666°

HTM-20 index

1739693926

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes