Key parameters at a glance

A radius of 13.50 Earth radii
A mass of 511.71 Earth masses
Surface gravity around 2.81 g
An orbital period of 157.570 days
Semi-major axis 0.6800 AU
Distance from Earth 447.41 light-years
Earth Similarity Index 0.348
Travel time at Voyager 1 speed 7,890,150 years

HD 100655 b Planet Profile

Physical Specs

Radius

13.50 R⊕

Radius (Jupiter)

1.210 R♃

Mass

511.71 M⊕

Mass (Jupiter)

1.610 M♃

Density

1.14 g/cm³

Surface Gravity

2.81 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.348

HZ Position Unknown

Controversial No

Discovery

Year 2011

Method Radial Velocity

Facility Bohyunsan Optical Astronomical Observatory

Telescope 1.8 m Telescope

Size rank in cohort

Rank by radius

#671of 1771

top 37.8%

This planet

13.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 45350 b 13.50 R⊕ HD 82943 b 13.50 R⊕ HD 27442 b 13.50 R⊕

Metric	Earth	HD 100655 b	Jupiter
Radius (R⊕)	1.00	13.50	11.21
Mass (M⊕)	1.00	511.71	317.83
Density (g/cm³)	5.51	1.14	1.33
Surface Gravity (g)	1.00	2.81	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	511.706 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 100655

HIP

HIP 56508

TIC

TIC 156942082

Gaia DR2

Gaia DR2 3979226627820659072

Gaia DR3

Gaia DR3 3979226627820659072

System

HD 100655

Percentile among Gas Giant cohort

Radius 13.500 R⊕ · percentile 59 / cohort 1771

Mass 511.706 M⊕ · percentile 49 / cohort 1747

Orbital period 157.57 d · percentile 56 / cohort 1533

Distance 137.18 pc · percentile 42 / cohort 1759

ESI 0.348 · percentile 70 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

157.570 days

Semi-major axis

0.6800 AU

Eccentricity

0.090

Inclination

— °

Year Length

A year here lasts approximately 157.57 Earth days (43.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.6800 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.348

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Omiya et al. 2012

Instrument

BOES Echelle Spectrograph

Publication

2012-04

Observation locale

Ground

Host System: HD 100655

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

4,891 K — cooler than the Sun (5,778 K)

Estimated Age

1.31 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

10.060 R☉

Stellar Mass

2.280 M☉

Metallicity [Fe/H]

0.07

Extended Stellar Properties

Surface gravity (log g)

2.790 dex

Systemic radial velocity

-4.85 km/s

Rotational v·sin i

1.60 km/s

Metallicity ratio

[Fe/H]

Distance

137.18 parsec

Light-years 447.41 ly

V-band magnitude

6.44 mag

Voyager-speed travel 7,890,150 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

7.261 mas

Total Proper Motion

59.704 mas/yr

PM Right Ascension

-59.70 mas/yr

PM Declination

-1.05 mas/yr

Galactic Cartesian (pc)

x = -0.931 · y = 0.102 · z = 0.349

Equatorial (J2000)

RA 173.76536° · Dec 20.44154°

Galactic ℓ, b

229.798° · 71.319°

Ecliptic λ, β

165.994° · 16.257°

HTM-20 index

1356538721

Observation Record

Photometric series

RV measurements

Archive notes