Key parameters at a glance

A radius of 13.50 Earth radii
A mass of 491.68 Earth masses
Surface gravity around 2.70 g
An orbital period of 847.000 days
Semi-major axis 1.8500 AU
Distance from Earth 427.91 light-years
Earth Similarity Index 0.346
Travel time at Voyager 1 speed 7,546,253 years

HD 30856 b Planet Profile

Physical Specs

Radius

13.50 R⊕

Radius (Jupiter)

1.210 R♃

Mass

491.68 M⊕

Mass (Jupiter)

1.547 M♃

Density

1.10 g/cm³

Surface Gravity

2.70 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.346

HZ Position Unknown

Controversial No

Discovery

Year 2011

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I 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 30856 b	Jupiter
Radius (R⊕)	1.00	13.50	11.21
Mass (M⊕)	1.00	491.68	317.83
Density (g/cm³)	5.51	1.10	1.33
Surface Gravity (g)	1.00	2.70	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	491.683 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 30856

HIP

HIP 22491

TIC

TIC 612908

Gaia DR2

Gaia DR2 4893980371818915456

Gaia DR3

Gaia DR3 4893980371818915456

System

HD 30856

Percentile among Gas Giant cohort

Radius 13.500 R⊕ · percentile 59 / cohort 1771

Mass 491.683 M⊕ · percentile 48 / cohort 1747

Orbital period 847.00 d · percentile 74 / cohort 1533

Distance 131.20 pc · percentile 41 / cohort 1759

ESI 0.346 · percentile 70 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

847.000 days

Semi-major axis

1.8500 AU

Eccentricity

0.061

Inclination

— °

Year Length

A year here lasts about 2.32 Earth years on a nearly circular orbit at a mean orbital distance of 1.8500 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.346

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Johnson et al. 2011

Instrument

HIRES Spectrometer

Publication

2011-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2011 at W. M. Keck Observatory (12 shown).

HD 5891 b · Gas Giant HD 102329 b · Gas Giant HD 18742 b · Gas Giant HD 142245 b · Gas Giant CFBDSIR J145829+101343 b · Gas Giant HD 1502 b · Gas Giant HD 108863 b · Gas Giant HD 82886 b · Gas Giant HD 106270 b · Gas Giant HD 98219 b · Gas Giant HD 152581 b · Gas Giant HD 131496 b · Gas Giant

Host System: HD 30856

Spectral Class

K-type orange

Effective Temperature

4,895 K — cooler than the Sun (5,778 K)

Estimated Age

3.80 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

4.400 R☉

Stellar Mass

1.170 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

3.200 dex

Systemic radial velocity

35.71 km/s

Rotational v·sin i

2.85 km/s

Metallicity ratio

[Fe/H]

Distance

131.20 parsec

Light-years 427.91 ly

V-band magnitude

7.91 mag

Voyager-speed travel 7,546,253 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

7.593 mas

Total Proper Motion

27.063 mas/yr

PM Right Ascension

18.39 mas/yr

PM Declination

-19.85 mas/yr

Galactic Cartesian (pc)

x = 0.273 · y = 0.869 · z = -0.413

Equatorial (J2000)

RA 72.57451° · Dec -24.36893°

Galactic ℓ, b

224.272° · -36.654°

Ecliptic λ, β

66.692° · -46.408°

HTM-20 index

1720058914

Observation Record

Photometric series

Stellar spectra

Archive notes

Similar Worlds

Kepler-46 c

Gas Giant · K-type orange

Radius 13.50 R⊕ · 2,534.4 ly

HD 222076 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 297.3 ly

HD 128311 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 53.3 ly

BD+48 740 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 2,174.1 ly

HD 81688 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 279.6 ly

HD 47366 c

Gas Giant · K-type orange

Radius 13.50 R⊕ · 275.1 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries W. M. Keck Observatory Mission K-type orange Hosts