Key parameters at a glance

A radius of 13.90 Earth radii
A mass of 261.00 Earth masses
Surface gravity around 1.35 g
An orbital period of 391.900 days
Semi-major axis 1.0200 AU
Distance from Earth 142.27 light-years
Earth Similarity Index 0.293
Travel time at Voyager 1 speed 2,508,901 years

1 sibling around HD 155358

HD 155358 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 155358 b	Gas Giant	13.80	314.65	194.300	—	2007
HD 155358 c this	Gas Giant	13.90	261.00	391.900	—	2007

HD 155358 c Planet Profile

Physical Specs

Radius

13.90 R⊕

Radius (Jupiter)

1.240 R♃

Mass

261.00 M⊕

Mass (Jupiter)

0.820 M♃

Density

0.53 g/cm³

Surface Gravity

1.35 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.293

HZ Position Unknown

Controversial No

Discovery

Year 2007

Method Radial Velocity

Facility McDonald Observatory

Telescope 9.2 m Hobby-Eberly 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

24 Sex c 13.90 R⊕ HD 148156 b 13.90 R⊕ HD 134987 c 13.90 R⊕

Metric	Earth	HD 155358 c	Jupiter
Radius (R⊕)	1.00	13.90	11.21
Mass (M⊕)	1.00	261.00	317.83
Density (g/cm³)	5.51	0.53	1.33
Surface Gravity (g)	1.00	1.35	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	261.000 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 155358

HIP

HIP 83949

TIC

TIC 21897561

Gaia DR2

Gaia DR2 1334643739861016832

Gaia DR3

Gaia DR3 1334643739861016832

System

HD 155358

Percentile among Gas Giant cohort

Radius 13.900 R⊕ · percentile 72 / cohort 1771

Mass 261.000 M⊕ · percentile 28 / cohort 1747

Orbital period 391.90 d · percentile 64 / cohort 1533

Distance 43.62 pc · percentile 16 / cohort 1759

ESI 0.293 · percentile 56 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

391.900 days

Semi-major axis

1.0200 AU

Eccentricity

0.160

Inclination

— °

Year Length

A year here lasts about 1.07 Earth years on a mildly elliptical path at a mean orbital distance of 1.0200 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.293

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Cochran et al. 2007

Instrument

High Resolution Spectrograph

Publication

2007-08

Observation locale

Ground

Discovery cohort

Planets confirmed in 2007 at McDonald Observatory (2 shown).

HD 17092 b · Gas Giant HD 155358 b · Gas Giant

Host System: HD 155358

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,900 K — hotter than the Sun (5,778 K)

Estimated Age

10.70 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.380 R☉

Stellar Mass

0.920 M☉

Metallicity [Fe/H]

-0.51

Extended Stellar Properties

Surface gravity (log g)

4.160 dex

Stellar density

0.624 g/cm³

Systemic radial velocity

-9.07 km/s

Rotational v·sin i

2.00 km/s

Metallicity ratio

[Fe/H]

Distance

43.62 parsec

Light-years 142.27 ly

V-band magnitude

7.28 mag

Voyager-speed travel 2,508,901 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

22.897 mas

Total Proper Motion

310.007 mas/yr

PM Right Ascension

-222.46 mas/yr

PM Declination

-215.91 mas/yr

Galactic Cartesian (pc)

x = -0.182 · y = -0.815 · z = 0.550

Equatorial (J2000)

RA 257.39309° · Dec 33.35493°

Galactic ℓ, b

56.283° · 34.775°

Ecliptic λ, β

250.986° · 55.965°

HTM-20 index

-238828960