Key parameters at a glance

A radius of 13.40 Earth radii
A mass of 594.02 Earth masses
Surface gravity around 3.31 g
An orbital period of 686.500 days
Semi-major axis 1.6600 AU
Distance from Earth 540.64 light-years
Earth Similarity Index 0.361
Travel time at Voyager 1 speed 9,534,119 years

HD 152581 b Planet Profile

Physical Specs

Radius

13.40 R⊕

Radius (Jupiter)

1.200 R♃

Mass

594.02 M⊕

Mass (Jupiter)

1.869 M♃

Density

1.36 g/cm³

Surface Gravity

3.31 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.361

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

#730of 1771

top 41.2%

This planet

13.40R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 114783 c 13.40 R⊕ HIP 79431 b 13.40 R⊕ HD 68988 b 13.40 R⊕

Metric	Earth	HD 152581 b	Jupiter
Radius (R⊕)	1.00	13.40	11.21
Mass (M⊕)	1.00	594.02	317.83
Density (g/cm³)	5.51	1.36	1.33
Surface Gravity (g)	1.00	3.31	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	594.024 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 152581

HIP

HIP 82651

TIC

TIC 353181458

Gaia DR2

Gaia DR2 4448227641977175296

Gaia DR3

Gaia DR3 4448227641977175296

System

HD 152581

Percentile among Gas Giant cohort

Radius 13.400 R⊕ · percentile 56 / cohort 1771

Mass 594.024 M⊕ · percentile 53 / cohort 1747

Orbital period 686.50 d · percentile 72 / cohort 1533

Distance 165.76 pc · percentile 47 / cohort 1759

ESI 0.361 · percentile 74 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

686.500 days

Semi-major axis

1.6600 AU

Eccentricity

0.040

Inclination

— °

Year Length

A year here lasts about 1.88 Earth years on a nearly circular orbit at a mean orbital distance of 1.6600 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.361

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 5891 b · Gas Giant 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 131496 b · Gas Giant HD 30856 b · Gas Giant

Host System: HD 152581

Spectral Class

K-type orange

Effective Temperature

5,027 K — cooler than the Sun (5,778 K)

Estimated Age

12.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

5.140 R☉

Stellar Mass

1.300 M☉

Metallicity [Fe/H]

-0.46

Extended Stellar Properties

Surface gravity (log g)

3.290 dex

Systemic radial velocity

3.97 km/s

Rotational v·sin i

0.50 km/s

Metallicity ratio

[Fe/H]

Distance

165.76 parsec

Light-years 540.64 ly

V-band magnitude

8.38 mag

Voyager-speed travel 9,534,119 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

6.004 mas

Total Proper Motion

19.028 mas/yr

PM Right Ascension

11.60 mas/yr

PM Declination

-15.09 mas/yr

Galactic Cartesian (pc)

x = -0.279 · y = -0.938 · z = 0.207

Equatorial (J2000)

RA 253.43165° · Dec 11.97368°

Galactic ℓ, b

30.612° · 31.491°

Ecliptic λ, β

250.264° · 34.285°

HTM-20 index

-2073405213

Similar Worlds

HD 93083 b

Gas Giant · K-type orange

Radius 13.40 R⊕ · 93.0 ly

Kepler-48 e

Gas Giant · K-type orange

Radius 13.40 R⊕ · 1,000.4 ly

HD 47366 b

Gas Giant · K-type orange

Radius 13.40 R⊕ · 275.1 ly

HIP 114933 b

Gas Giant · K-type orange

Radius 13.40 R⊕ · 331.9 ly

HD 114783 c

Gas Giant · K-type orange

Radius 13.40 R⊕ · 68.7 ly

HD 4732 b

Gas Giant · K-type orange

Radius 13.40 R⊕ · 178.7 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries W. M. Keck Observatory Mission K-type orange Hosts