Key parameters at a glance

A radius of 13.90 Earth radii
A mass of 270.14 Earth masses
Surface gravity around 1.40 g
An orbital period of 1,027.000 days
Semi-major axis 2.4500 AU
Distance from Earth 186.33 light-years
Earth Similarity Index 0.295
Travel time at Voyager 1 speed 3,285,918 years

HD 148156 b Planet Profile

Physical Specs

Radius

13.90 R⊕

Radius (Jupiter)

1.240 R♃

Mass

270.14 M⊕

Mass (Jupiter)

0.850 M♃

Density

0.55 g/cm³

Surface Gravity

1.40 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.295

HZ Position Unknown

Controversial No

Discovery

Year 2009

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#456of 1771

top 25.7%

This planet

13.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 155358 c 13.90 R⊕ 24 Sex c 13.90 R⊕ HD 134987 c 13.90 R⊕

Metric	Earth	HD 148156 b	Jupiter
Radius (R⊕)	1.00	13.90	11.21
Mass (M⊕)	1.00	270.14	317.83
Density (g/cm³)	5.51	0.55	1.33
Surface Gravity (g)	1.00	1.40	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	270.144 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 148156

HIP

HIP 80680

TIC

TIC 225317852

Gaia DR2

Gaia DR2 5942178414758660864

Gaia DR3

Gaia DR3 5942178414758660864

System

HD 148156

Percentile among Gas Giant cohort

Radius 13.900 R⊕ · percentile 72 / cohort 1771

Mass 270.144 M⊕ · percentile 29 / cohort 1747

Orbital period 1,027.00 d · percentile 78 / cohort 1533

Distance 57.13 pc · percentile 24 / cohort 1759

ESI 0.295 · percentile 57 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,027.000 days

Semi-major axis

2.4500 AU

Eccentricity

0.520

Inclination

— °

Year Length

A year here lasts about 2.81 Earth years on a highly eccentric trajectory at a mean orbital distance of 2.4500 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.295

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 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 147018 b · Gas Giant

Host System: HD 148156

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

6,308 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.210 R☉

Stellar Mass

1.220 M☉

Metallicity [Fe/H]

0.29

Extended Stellar Properties

Surface gravity (log g)

4.560 dex

Stellar density

0.731 g/cm³

Systemic radial velocity

-1.84 km/s

Rotational v·sin i

5.73 km/s

Activity index (log R'HK)

-4.910

Metallicity ratio

[Fe/H]

Distance

57.13 parsec

Light-years 186.33 ly

V-band magnitude

7.69 mag

Voyager-speed travel 3,285,918 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

17.476 mas

Total Proper Motion

53.465 mas/yr

PM Right Ascension

45.59 mas/yr

PM Declination

27.93 mas/yr

Galactic Cartesian (pc)

x = -0.269 · y = -0.636 · z = -0.723

Equatorial (J2000)

RA 247.07230° · Dec -46.31751°

Galactic ℓ, b

337.023° · 1.702°

Ecliptic λ, β

252.835° · -24.235°

HTM-20 index

-1445128655