Key parameters at a glance

A radius of 13.80 Earth radii
A mass of 314.65 Earth masses
Surface gravity around 1.65 g
An orbital period of 194.300 days
Semi-major axis 0.6300 AU
Distance from Earth 142.27 light-years
Earth Similarity Index 0.308
Travel time at Voyager 1 speed 2,508,901 years

1 sibling around HD 155358

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

HD 155358 b Planet Profile

Physical Specs

Radius

13.80 R⊕

Radius (Jupiter)

1.230 R♃

Mass

314.65 M⊕

Mass (Jupiter)

0.990 M♃

Density

0.66 g/cm³

Surface Gravity

1.65 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.308

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

#510of 1771

top 28.7%

This planet

13.80R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

GJ 179 b 13.80 R⊕ GJ 832 b 13.80 R⊕ HD 219415 b 13.80 R⊕

Metric	Earth	HD 155358 b	Jupiter
Radius (R⊕)	1.00	13.80	11.21
Mass (M⊕)	1.00	314.65	317.83
Density (g/cm³)	5.51	0.66	1.33
Surface Gravity (g)	1.00	1.65	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	314.652 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 13.800 R⊕ · percentile 70 / cohort 1771

Mass 314.652 M⊕ · percentile 35 / cohort 1747

Orbital period 194.30 d · percentile 57 / cohort 1533

Distance 43.62 pc · percentile 16 / cohort 1759

ESI 0.308 · percentile 61 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

194.300 days

Semi-major axis

0.6300 AU

Eccentricity

0.170

Inclination

— °

Year Length

A year here lasts approximately 194.30 Earth days (53.2% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.6300 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.308

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 c · Gas Giant

Host System: HD 155358

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,905 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

1.150 M☉

Metallicity [Fe/H]

-0.60

Extended Stellar Properties

Surface gravity (log g)

4.220 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