Key parameters at a glance

A radius of 13.60 Earth radii
A mass of 451.32 Earth masses
Surface gravity around 2.44 g
An orbital period of 649.000 days
Semi-major axis 1.4400 AU
Distance from Earth 167.88 light-years
Earth Similarity Index 0.337
Travel time at Voyager 1 speed 2,960,638 years

1 sibling around HD 133131 A

HD 133131 A 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 133131 A b this	Gas Giant	13.60	451.32	649.000	—	2016
HD 133131 A c	Gas Giant	14.30	133.49	3,568.000	—	2016

HD 133131 A b Planet Profile

Physical Specs

Radius

13.60 R⊕

Radius (Jupiter)

1.210 R♃

Mass

451.32 M⊕

Mass (Jupiter)

1.420 M♃

Density

0.99 g/cm³

Surface Gravity

2.44 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.337

HZ Position Unknown

Controversial No

Discovery

Year 2016

Method Radial Velocity

Facility Las Campanas Observatory

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#609of 1771

top 34.3%

This planet

13.60R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 19994 b 13.60 R⊕ HD 205739 b 13.60 R⊕ HD 79498 b 13.60 R⊕

Metric	Earth	HD 133131 A b	Jupiter
Radius (R⊕)	1.00	13.60	11.21
Mass (M⊕)	1.00	451.32	317.83
Density (g/cm³)	5.51	0.99	1.33
Surface Gravity (g)	1.00	2.44	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	451.319 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 133131 A

HIP

HIP 73674 A

TIC

TIC 440955228

Gaia DR2

Gaia DR2 6224633983987510528

Gaia DR3

Gaia DR3 6224633983987510528

System

HD 133131

Percentile among Gas Giant cohort

Radius 13.600 R⊕ · percentile 63 / cohort 1771

Mass 451.319 M⊕ · percentile 46 / cohort 1747

Orbital period 649.00 d · percentile 71 / cohort 1533

Distance 51.47 pc · percentile 21 / cohort 1759

ESI 0.337 · percentile 67 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

649.000 days

Semi-major axis

1.4400 AU

Eccentricity

0.330

Inclination

— °

Year Length

A year here lasts about 1.78 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.4400 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.337

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Teske et al. 2016

Instrument

Multiple Instruments

Publication

2016-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2016 at Las Campanas Observatory (2 shown).

HD 133131 B b · Gas Giant HD 133131 A c · Gas Giant

Host System: HD 133131 A

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,799 K — hotter than the Sun (5,778 K)

Estimated Age

9.70 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.955 R☉

Stellar Mass

0.950 M☉

Metallicity [Fe/H]

-0.31

Extended Stellar Properties

Surface gravity (log g)

4.390 dex

Stellar density

1.716 g/cm³

Systemic radial velocity

-15.80 km/s

Rotational v·sin i

4.00 km/s

Metallicity ratio

[Fe/H]

Distance

51.47 parsec

Light-years 167.88 ly

V-band magnitude

7.66 mag

Voyager-speed travel 2,960,638 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

19.399 mas

Total Proper Motion

205.460 mas/yr

PM Right Ascension

155.99 mas/yr

PM Declination

-133.72 mas/yr

Galactic Cartesian (pc)

x = -0.615 · y = -0.635 · z = -0.467

Equatorial (J2000)

RA 225.89845° · Dec -27.84314°

Galactic ℓ, b

335.537° · 26.534°

Ecliptic λ, β

231.306° · -10.133°

HTM-20 index

635073186