Key parameters at a glance

A radius of 13.40 Earth radii
A mass of 674.00 Earth masses
Surface gravity around 3.75 g
An orbital period of 44.236 days
Semi-major axis 0.2388 AU
Distance from Earth 131.85 light-years
Earth Similarity Index 0.369
Travel time at Voyager 1 speed 2,325,184 years

1 sibling around HD 147018

HD 147018 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 147018 b this	Gas Giant	13.40	674.00	44.236	—	2009
HD 147018 c	Gas Giant	12.70	2,080.00	1,008.000	—	2009

HD 147018 b Planet Profile

Physical Specs

Radius

13.40 R⊕

Radius (Jupiter)

1.190 R♃

Mass

674.00 M⊕

Mass (Jupiter)

2.120 M♃

Density

1.54 g/cm³

Surface Gravity

3.75 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.369

HZ Position Unknown

Controversial No

Discovery

Year 2009

Method Radial Velocity

Facility La Silla Observatory

Telescope 1.2 m Leonhard Euler Telescope

Size rank in cohort

Rank by radius

#730of 1771

top 41.2%

This planet

13.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 114783 c 13.40 R⊕ HIP 79431 b 13.40 R⊕ HD 68988 b 13.40 R⊕

Metric	Earth	HD 147018 b	Jupiter
Radius (R⊕)	1.00	13.40	11.21
Mass (M⊕)	1.00	674.00	317.83
Density (g/cm³)	5.51	1.54	1.33
Surface Gravity (g)	1.00	3.75	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	674.000 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 147018

HIP

HIP 80250

TIC

TIC 350083732

Gaia DR2

Gaia DR2 5831054382288870912

Gaia DR3

Gaia DR3 5831054382288870912

System

HD 147018

Percentile among Gas Giant cohort

Radius 13.400 R⊕ · percentile 56 / cohort 1771

Mass 674.000 M⊕ · percentile 57 / cohort 1747

Orbital period 44.24 d · percentile 50 / cohort 1533

Distance 40.43 pc · percentile 14 / cohort 1759

ESI 0.369 · percentile 76 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

44.236 days

Semi-major axis

0.2388 AU

Eccentricity

0.469

Inclination

— °

Year Length

A year here lasts approximately 44.24 Earth days (12.1% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.2388 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.369

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Segransan et al. 2010

Instrument

CORALIE Spectrograph

Publication

2010-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2009 at La Silla Observatory (12 shown).

GJ 581 e · Super-Earth HD 125612 c · Neptune-like HD 90156 b · Neptune-like HD 147018 c · Gas Giant HD 103197 b · Neptune-like HD 125612 d · Gas Giant HIP 70849 b · Gas Giant HD 85390 b · Neptune-like HD 190984 b · Gas Giant HD 171238 b · Gas Giant HD 290327 b · Gas Giant HD 110014 b · Gas Giant

Host System: HD 147018

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,441 K — cooler than the Sun (5,778 K)

Estimated Age

6.36 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.938 R☉

Stellar Mass

0.927 M☉

Metallicity [Fe/H]

0.10

Extended Stellar Properties

Surface gravity (log g)

4.420 dex

Stellar density

1.676 g/cm³

Systemic radial velocity

-27.35 km/s

Rotational v·sin i

1.56 km/s

Metallicity ratio

[Fe/H]

Distance

40.43 parsec

Light-years 131.85 ly

V-band magnitude

8.30 mag

Voyager-speed travel 2,325,184 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

24.708 mas

Total Proper Motion

362.651 mas/yr

PM Right Ascension

-177.50 mas/yr

PM Declination

-316.24 mas/yr

Galactic Cartesian (pc)

x = -0.195 · y = -0.432 · z = -0.880

Equatorial (J2000)

RA 245.74900° · Dec -61.69013°

Galactic ℓ, b

325.410° · -8.441°

Ecliptic λ, β

255.380° · -39.476°

HTM-20 index

1065003242