Key parameters at a glance

A radius of 14.30 Earth radii
A mass of 140.80 Earth masses
Surface gravity around 0.69 g
An orbital period of 280.170 days
Semi-major axis 0.8700 AU
Distance from Earth 173.23 light-years
Earth Similarity Index 0.245
Travel time at Voyager 1 speed 3,054,869 years

HD 164509 b Planet Profile

Physical Specs

Radius

14.30 R⊕

Radius (Jupiter)

1.280 R♃

Mass

140.80 M⊕

Mass (Jupiter)

0.443 M♃

Density

0.27 g/cm³

Surface Gravity

0.69 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.245

HZ Position Unknown

Controversial No

Discovery

Year 2010

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#301of 1771

top 16.9%

This planet

14.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HIP 65407 b 14.30 R⊕ HD 30669 b 14.30 R⊕ HD 45652 b 14.30 R⊕

Metric	Earth	HD 164509 b	Jupiter
Radius (R⊕)	1.00	14.30	11.21
Mass (M⊕)	1.00	140.80	317.83
Density (g/cm³)	5.51	0.27	1.33
Surface Gravity (g)	1.00	0.69	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	140.799 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 164509

HIP

HIP 88268

TIC

TIC 382764222

Gaia DR2

Gaia DR2 4275421969292868224

Gaia DR3

Gaia DR3 4275421969292868224

System

HD 164509

Percentile among Gas Giant cohort

Radius 14.300 R⊕ · percentile 82 / cohort 1771

Mass 140.799 M⊕ · percentile 11 / cohort 1747

Orbital period 280.17 d · percentile 60 / cohort 1533

Distance 53.11 pc · percentile 21 / cohort 1759

ESI 0.245 · percentile 43 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

280.170 days

Semi-major axis

0.8700 AU

Eccentricity

0.238

Inclination

— °

Year Length

A year here lasts approximately 280.17 Earth days (76.7% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.8700 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.245

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Giguere et al. 2012

Instrument

HIRES Spectrometer

Publication

2012-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2010 at W. M. Keck Observatory (12 shown).

HD 156668 b · Super-Earth HD 1461 b · Sub-Neptune GJ 876 e · Sub-Neptune HAT-P-17 c · Gas Giant HD 97658 b · Sub-Neptune HD 163607 c · Gas Giant HD 177830 c · Neptune-like HD 218566 b · Neptune-like HD 102956 b · Gas Giant HD 163607 b · Gas Giant GJ 1148 b · Gas Giant HD 31253 b · Gas Giant

Host System: HD 164509

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,859 K — hotter than the Sun (5,778 K)

Estimated Age

2.32 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.110 R☉

Stellar Mass

1.120 M☉

Metallicity [Fe/H]

0.20

Extended Stellar Properties

Surface gravity (log g)

4.440 dex

Stellar density

1.015 g/cm³

Systemic radial velocity

0.01 km/s

Rotational v·sin i

2.40 km/s

Metallicity ratio

[Fe/H]

Distance

53.11 parsec

Light-years 173.23 ly

V-band magnitude

8.10 mag

Voyager-speed travel 3,054,869 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

18.799 mas

Total Proper Motion

21.845 mas/yr

PM Right Ascension

-7.86 mas/yr

PM Declination

-20.38 mas/yr

Galactic Cartesian (pc)

x = 0.007 · y = -1.000 · z = 0.002

Equatorial (J2000)

RA 270.38008° · Dec 0.10447°

Galactic ℓ, b

27.264° · 11.137°

Ecliptic λ, β

270.411° · 23.543°

HTM-20 index

28096586

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes