Key parameters at a glance

A radius of 12.40 Earth radii
A mass of 3,391.25 Earth masses
Surface gravity around 22.06 g
An orbital period of 359.510 days
Semi-major axis 1.1200 AU
Distance from Earth 155.68 light-years
Earth Similarity Index 0.374
Travel time at Voyager 1 speed 2,745,499 years

HD 156846 b Planet Profile

Physical Specs

Radius

12.40 R⊕

Radius (Jupiter)

1.110 R♃

Mass

3,391.25 M⊕

Mass (Jupiter)

10.670 M♃

Density

9.77 g/cm³

Surface Gravity

22.06 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.374

HZ Position Unknown

Controversial No

Discovery

Year 2007

Method Radial Velocity

Facility La Silla Observatory

Telescope 1.2 m Leonhard Euler Telescope

Size rank in cohort

Rank by radius

#1298of 1771

top 73.2%

This planet

12.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 110014 b 12.40 R⊕ CFBDSIR J145829+101343 b 12.40 R⊕ MOA-2010-BLG-073L b 12.40 R⊕

Metric	Earth	HD 156846 b	Jupiter
Radius (R⊕)	1.00	12.40	11.21
Mass (M⊕)	1.00	3,391.25	317.83
Density (g/cm³)	5.51	9.77	1.33
Surface Gravity (g)	1.00	22.06	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	3,391.246 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 156846

HIP

HIP 84856

TIC

TIC 75673519

Gaia DR2

Gaia DR2 4122343906051101184

Gaia DR3

Gaia DR3 4122343906051101184

System

HD 156846

Percentile among Gas Giant cohort

Radius 12.400 R⊕ · percentile 25 / cohort 1771

Mass 3,391.246 M⊕ · percentile 89 / cohort 1747

Orbital period 359.51 d · percentile 63 / cohort 1533

Distance 47.73 pc · percentile 18 / cohort 1759

ESI 0.374 · percentile 77 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

359.510 days

Semi-major axis

1.1200 AU

Eccentricity

0.850

Inclination

— °

Year Length

A year here lasts approximately 359.51 Earth days (98.4% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 1.1200 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.374

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Tamuz et al. 2008

Instrument

CORALIE Spectrograph

Publication

2008-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2007 at La Silla Observatory (10 shown).

GJ 581 c · Sub-Neptune GJ 674 b · Sub-Neptune HD 219828 b · Neptune-like HD 70573 b · Gas Giant HD 221287 b · Gas Giant HD 171028 b · Gas Giant BD-13 2130 b · Gas Giant HD 190647 b · Gas Giant HD 4113 b · Gas Giant HD 100777 b · Gas Giant

Host System: HD 156846

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

6,090 K — hotter than the Sun (5,778 K)

Estimated Age

2.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.900 R☉

Stellar Mass

1.380 M☉

Metallicity [Fe/H]

0.15

Extended Stellar Properties

Surface gravity (log g)

4.020 dex

Stellar density

0.204 g/cm³

Systemic radial velocity

-68.54 km/s

Rotational v·sin i

5.05 km/s

Metallicity ratio

[Fe/H]

Distance

47.73 parsec

Light-years 155.68 ly

V-band magnitude

6.50 mag

Voyager-speed travel 2,745,499 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

20.921 mas

Total Proper Motion

198.253 mas/yr

PM Right Ascension

-137.10 mas/yr

PM Declination

-143.20 mas/yr

Galactic Cartesian (pc)

x = -0.162 · y = -0.930 · z = -0.331

Equatorial (J2000)

RA 260.14234° · Dec -19.33437°

Galactic ℓ, b

5.034° · 9.982°

Ecliptic λ, β

260.679° · 3.787°

HTM-20 index

357400165