Key parameters at a glance

A radius of 12.60 Earth radii
A mass of 2,425.04 Earth masses
Surface gravity around 15.27 g
An orbital period of 177.110 days
Semi-major axis 0.6400 AU
Distance from Earth 924.66 light-years
Earth Similarity Index 0.420
Travel time at Voyager 1 speed 16,306,357 years

HD 5891 b Planet Profile

Physical Specs

Radius

12.60 R⊕

Radius (Jupiter)

1.130 R♃

Mass

2,425.04 M⊕

Mass (Jupiter)

7.630 M♃

Density

6.66 g/cm³

Surface Gravity

15.27 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.420

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

#1179of 1771

top 66.5%

This planet

12.60R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

Kepler-419 c 12.60 R⊕ 2MASS J04414489+2301513 b 12.60 R⊕ HD 47536 b 12.60 R⊕

Metric	Earth	HD 5891 b	Jupiter
Radius (R⊕)	1.00	12.60	11.21
Mass (M⊕)	1.00	2,425.04	317.83
Density (g/cm³)	5.51	6.66	1.33
Surface Gravity (g)	1.00	15.27	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	2,425.043 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 5891

HIP

HIP 4715

TIC

TIC 243146568

Gaia DR2

Gaia DR2 2788816827588309120

Gaia DR3

Gaia DR3 2788816827588309120

System

HD 5891

Percentile among Gas Giant cohort

Radius 12.600 R⊕ · percentile 31 / cohort 1771

Mass 2,425.043 M⊕ · percentile 82 / cohort 1747

Orbital period 177.11 d · percentile 57 / cohort 1533

Distance 283.50 pc · percentile 59 / cohort 1759

ESI 0.420 · percentile 91 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

177.110 days

Semi-major axis

0.6400 AU

Eccentricity

0.070

Inclination

— °

Year Length

A year here lasts approximately 177.11 Earth days (48.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.6400 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.420

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 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 HD 30856 b · Gas Giant

Host System: HD 5891

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

4,673 K — cooler than the Sun (5,778 K)

Estimated Age

1.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

10.640 R☉

Stellar Mass

1.930 M☉

Metallicity [Fe/H]

-0.37

Extended Stellar Properties

Surface gravity (log g)

2.670 dex

Systemic radial velocity

-96.16 km/s

Rotational v·sin i

4.95 km/s

Metallicity ratio

[Fe/H]

Distance

283.50 parsec

Light-years 924.66 ly

V-band magnitude

8.09 mag

Voyager-speed travel 16,306,357 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

3.500 mas

Total Proper Motion

40.241 mas/yr

PM Right Ascension

3.23 mas/yr

PM Declination

-40.11 mas/yr

Galactic Cartesian (pc)

x = 0.905 · y = 0.245 · z = 0.347

Equatorial (J2000)

RA 15.13832° · Dec 20.29231°

Galactic ℓ, b

125.833° · -42.528°

Ecliptic λ, β

21.826° · 12.754°

HTM-20 index

-717343972