Key parameters at a glance

A radius of 13.40 Earth radii
A mass of 667.42 Earth masses
Surface gravity around 3.72 g
An orbital period of 111.700 days
Semi-major axis 0.3600 AU
Distance from Earth 47.40 light-years
Earth Similarity Index 0.368
Travel time at Voyager 1 speed 835,869 years

HIP 79431 b Planet Profile

Physical Specs

Radius

13.40 R⊕

Radius (Jupiter)

1.190 R♃

Mass

667.42 M⊕

Mass (Jupiter)

2.100 M♃

Density

1.52 g/cm³

Surface Gravity

3.72 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.368

HZ Position Unknown

Controversial No

Discovery

Year 2009

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#730of 1771

top 41.2%

This planet

13.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 68988 b 13.40 R⊕ HD 114783 c 13.40 R⊕ HD 82943 c 13.40 R⊕

Metric	Earth	HIP 79431 b	Jupiter
Radius (R⊕)	1.00	13.40	11.21
Mass (M⊕)	1.00	667.42	317.83
Density (g/cm³)	5.51	1.52	1.33
Surface Gravity (g)	1.00	3.72	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	667.415 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 79431

TIC

TIC 49324530

Gaia DR2

Gaia DR2 6245870673116518784

Gaia DR3

Gaia DR3 6245870673116518784

System

HIP 79431

Percentile among Gas Giant cohort

Radius 13.400 R⊕ · percentile 56 / cohort 1771

Mass 667.415 M⊕ · percentile 56 / cohort 1747

Orbital period 111.70 d · percentile 54 / cohort 1533

Distance 14.53 pc · percentile 2 / cohort 1759

ESI 0.368 · percentile 76 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

111.700 days

Semi-major axis

0.3600 AU

Eccentricity

0.290

Inclination

— °

Year Length

A year here lasts approximately 111.70 Earth days (30.6% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.3600 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.368

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Apps et al. 2010

Instrument

HIRES Spectrometer

Publication

2010-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2009 at W. M. Keck Observatory (12 shown).

HD 13931 b · Gas Giant HAT-P-13 c · Gas Giant HD 181342 b · Gas Giant HD 212771 b · Gas Giant HD 136418 b · Gas Giant HD 206610 b · Gas Giant HD 4313 b · Gas Giant HD 180902 b · Gas Giant HD 95089 b · Gas Giant GJ 179 b · Gas Giant HD 34445 b · Gas Giant GJ 649 b · Gas Giant

Host System: HIP 79431

Spectral Class

M-type red dwarf

Effective Temperature

3,191 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.479 R☉

Stellar Mass

0.490 M☉

Metallicity [Fe/H]

0.40

Extended Stellar Properties

Surface gravity (log g)

4.756 dex

Stellar density

6.127 g/cm³

Systemic radial velocity

-4.70 km/s

Metallicity ratio

[Fe/H]

Distance

14.53 parsec

Light-years 47.40 ly

V-band magnitude

11.39 mag

Voyager-speed travel 835,869 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

68.783 mas

Total Proper Motion

217.008 mas/yr

PM Right Ascension

35.71 mas/yr

PM Declination

-214.05 mas/yr

Galactic Cartesian (pc)

x = -0.427 · y = -0.844 · z = -0.324

Equatorial (J2000)

RA 243.17425° · Dec -18.87642°

Galactic ℓ, b

355.200° · 22.969°

Ecliptic λ, β

244.698° · 2.238°

HTM-20 index

2105859084

Observation Record

Photometric series

RV measurements

Stellar spectra

Similar Worlds

TIC 46432937 b

Gas Giant · M-type red dwarf

Radius 13.32 R⊕ · 295.3 ly

GJ 876 b

Gas Giant · M-type red dwarf

Radius 13.30 R⊕ · 15.2 ly

GJ 317 b

Gas Giant · M-type red dwarf

Radius 13.30 R⊕ · 49.6 ly

GJ 896 A b

Gas Giant · M-type red dwarf

Radius 13.30 R⊕ · 20.4 ly

GJ 328 b

Gas Giant · M-type red dwarf

Radius 13.30 R⊕ · 66.9 ly

AT2021ueyL b

Gas Giant · M-type red dwarf

Radius 13.60 R⊕ · 3,392.0 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries W. M. Keck Observatory Mission M-type red dwarf Hosts