Key parameters at a glance

A radius of 13.40 Earth radii
A mass of 669.35 Earth masses
Surface gravity around 3.73 g
An orbital period of 2,621.750 days
Semi-major axis 3.7870 AU
Distance from Earth 105.53 light-years
Earth Similarity Index 0.369
Travel time at Voyager 1 speed 1,860,965 years

HD 117207 b Planet Profile

Physical Specs

Radius

13.40 R⊕

Radius (Jupiter)

1.190 R♃

Mass

669.35 M⊕

Mass (Jupiter)

2.106 M♃

Density

1.53 g/cm³

Surface Gravity

3.73 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.369

HZ Position Unknown

Controversial No

Discovery

Year 2004

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 117207 b	Jupiter
Radius (R⊕)	1.00	13.40	11.21
Mass (M⊕)	1.00	669.35	317.83
Density (g/cm³)	5.51	1.53	1.33
Surface Gravity (g)	1.00	3.73	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	669.347 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	612.141 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 117207

HIP

HIP 65808

TIC

TIC 405501056

Gaia DR2

Gaia DR2 6166183842771027328

Gaia DR3

Gaia DR3 6166183842771027328

System

HD 117207

Percentile among Gas Giant cohort

Radius 13.400 R⊕ · percentile 56 / cohort 1771

Mass 669.347 M⊕ · percentile 56 / cohort 1747

Orbital period 2,621.75 d · percentile 87 / cohort 1533

Distance 32.35 pc · percentile 9 / cohort 1759

ESI 0.369 · percentile 76 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2,621.750 days

Semi-major axis

3.7870 AU

Eccentricity

0.157

Inclination

76.60 °

Year Length

A year here lasts about 7.18 Earth years on a mildly elliptical path at a mean orbital distance of 3.7870 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

27.780 m/s

Transit mid-time (BJD)

2,453,356.0000

Long. of periastron (ω)

90.22°

Angular separation (arcsec)

117.00000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.369

0 = alien, 1 = Earth-identical

Detection Signatures

Radial velocity

Stellar wobble has been measured spectroscopically.

Astrometry

Positional wobble of the host star was measured.

Discovery Paper

Primary reference

Marcy et al. 2005

Instrument

HIRES Spectrometer

Publication

2005-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2004 at W. M. Keck Observatory (6 shown).

HD 99492 b · Neptune-like HD 183263 b · Gas Giant HD 45350 b · Gas Giant HD 188015 b · Gas Giant GJ 436 b · Neptune-like HD 88133 b · Gas Giant

Host System: HD 117207

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,732 K — cooler than the Sun (5,778 K)

Estimated Age

4.19 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.074 R☉

Stellar Mass

1.053 M☉

Metallicity [Fe/H]

0.19

Extended Stellar Properties

Surface gravity (log g)

4.371 dex

Stellar density

0.946 g/cm³

Systemic radial velocity

-17.90 km/s

Rotational v·sin i

1.05 km/s

Rotation period

39.00 days

Activity index (log R'HK)

-5.060

Metallicity ratio

[Fe/H]

Distance

32.35 parsec

Light-years 105.53 ly

V-band magnitude

7.26 mag

Voyager-speed travel 1,860,965 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

30.879 mas

Total Proper Motion

218.017 mas/yr

PM Right Ascension

-205.95 mas/yr

PM Declination

-71.52 mas/yr

Galactic Cartesian (pc)

x = -0.752 · y = -0.309 · z = -0.582

Equatorial (J2000)

RA 202.33688° · Dec -35.57130°

Galactic ℓ, b

311.551° · 26.665°

Ecliptic λ, β

214.389° · -24.252°

HTM-20 index

1511793137

Observation Record

Photometric series

RV measurements

Archive notes