Key parameters at a glance

A radius of 13.30 Earth radii
A mass of 704.95 Earth masses
Surface gravity around 3.99 g
An orbital period of 1,184.100 days
Semi-major axis 2.3200 AU
Distance from Earth 182.16 light-years
Earth Similarity Index 0.375
Travel time at Voyager 1 speed 3,212,376 years

1 sibling around HD 159868

HD 159868 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 159868 c	Gas Giant	14.00	244.09	351.000	—	2012
HD 159868 b this	Gas Giant	13.30	704.95	1,184.100	—	2006

HD 159868 b Planet Profile

Physical Specs

Radius

13.30 R⊕

Radius (Jupiter)

1.190 R♃

Mass

704.95 M⊕

Mass (Jupiter)

2.218 M♃

Density

1.65 g/cm³

Surface Gravity

3.99 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.375

HZ Position Unknown

Controversial No

Discovery

Year 2006

Method Radial Velocity

Facility Anglo-Australian Telescope

Telescope 3.9 m Anglo-Australian Telescope

Size rank in cohort

Rank by radius

#793of 1771

top 44.7%

This planet

13.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 12661 b 13.30 R⊕ HD 129445 b 13.30 R⊕ GJ 876 b 13.30 R⊕

Metric	Earth	HD 159868 b	Jupiter
Radius (R⊕)	1.00	13.30	11.21
Mass (M⊕)	1.00	704.95	317.83
Density (g/cm³)	5.51	1.65	1.33
Surface Gravity (g)	1.00	3.99	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	704.947 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 159868

HIP

HIP 86375

TIC

TIC 248320609

Gaia DR2

Gaia DR2 5955841736510622208

Gaia DR3

Gaia DR3 5955841736510622208

System

HD 159868

Percentile among Gas Giant cohort

Radius 13.300 R⊕ · percentile 53 / cohort 1771

Mass 704.947 M⊕ · percentile 58 / cohort 1747

Orbital period 1,184.10 d · percentile 80 / cohort 1533

Distance 55.85 pc · percentile 23 / cohort 1759

ESI 0.375 · percentile 78 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,184.100 days

Semi-major axis

2.3200 AU

Eccentricity

0.024

Inclination

— °

Year Length

A year here lasts about 3.24 Earth years on a nearly circular orbit at a mean orbital distance of 2.3200 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.375

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

O Toole et al. 2007

Instrument

UCLES Spectrograph

Publication

2007-05

Observation locale

Ground

Discovery cohort

Planets confirmed in 2006 at Anglo-Australian Telescope (3 shown).

HD 23127 b · Gas Giant HD 20782 b · Gas Giant HD 187085 b · Gas Giant

Host System: HD 159868

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,534 K — cooler than the Sun (5,778 K)

Estimated Age

7.57 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

2.130 R☉

Stellar Mass

1.190 M☉

Metallicity [Fe/H]

-0.08

Extended Stellar Properties

Surface gravity (log g)

3.920 dex

Stellar density

0.156 g/cm³

Systemic radial velocity

-23.45 km/s

Rotational v·sin i

0.96 km/s

Activity index (log R'HK)

-5.090

Metallicity ratio

[Fe/H]

Distance

55.85 parsec

Light-years 182.16 ly

V-band magnitude

7.24 mag

Voyager-speed travel 3,212,376 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

17.876 mas

Total Proper Motion

285.097 mas/yr

PM Right Ascension

-230.51 mas/yr

PM Declination

-167.77 mas/yr

Galactic Cartesian (pc)

x = -0.067 · y = -0.727 · z = -0.684

Equatorial (J2000)

RA 264.74667° · Dec -43.14623°

Galactic ℓ, b

347.174° · -6.313°

Ecliptic λ, β

265.925° · -19.781°

HTM-20 index

1829013035

Observation Record

Photometric series

RV measurements

Stellar spectra