Key parameters at a glance

A radius of 13.30 Earth radii
A mass of 680.16 Earth masses
Surface gravity around 3.85 g
An orbital period of 464.300 days
Semi-major axis 1.2900 AU
Distance from Earth 343.01 light-years
Earth Similarity Index 0.372
Travel time at Voyager 1 speed 6,049,012 years

HD 136418 b Planet Profile

Physical Specs

Radius

13.30 R⊕

Radius (Jupiter)

1.190 R♃

Mass

680.16 M⊕

Mass (Jupiter)

2.140 M♃

Density

1.59 g/cm³

Surface Gravity

3.85 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.372

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

#793of 1771

top 44.7%

This planet

13.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 12661 b 13.30 R⊕ HD 129445 b 13.30 R⊕ GJ 876 b 13.30 R⊕

Metric	Earth	HD 136418 b	Jupiter
Radius (R⊕)	1.00	13.30	11.21
Mass (M⊕)	1.00	680.16	317.83
Density (g/cm³)	5.51	1.59	1.33
Surface Gravity (g)	1.00	3.85	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	680.156 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 136418

HIP

HIP 74961

TIC

TIC 1101862696

Gaia DR2

Gaia DR2 1392396172224832896

Gaia DR3

Gaia DR3 1392396172224832896

System

HD 136418

Percentile among Gas Giant cohort

Radius 13.300 R⊕ · percentile 53 / cohort 1771

Mass 680.156 M⊕ · percentile 57 / cohort 1747

Orbital period 464.30 d · percentile 66 / cohort 1533

Distance 105.17 pc · percentile 36 / cohort 1759

ESI 0.372 · percentile 77 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

464.300 days

Semi-major axis

1.2900 AU

Eccentricity

0.250

Inclination

— °

Year Length

A year here lasts about 1.27 Earth years on a mildly elliptical path at a mean orbital distance of 1.2900 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.372

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Johnson et al. 2010

Instrument

HIRES Spectrometer

Publication

2010-05

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 HIP 79431 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: HD 136418

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

4,989 K — cooler than the Sun (5,778 K)

Estimated Age

4.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

3.780 R☉

Stellar Mass

1.480 M☉

Metallicity [Fe/H]

-0.11

Extended Stellar Properties

Surface gravity (log g)

3.450 dex

Systemic radial velocity

-34.25 km/s

Metallicity ratio

[Fe/H]

Distance

105.17 parsec

Light-years 343.01 ly

V-band magnitude

7.85 mag

Voyager-speed travel 6,049,012 yr

Multi-band Host Photometry — 8 bands

Astrometric Data

Parallax

9.480 mas

Total Proper Motion

183.030 mas/yr

PM Right Ascension

-20.06 mas/yr

PM Declination

-181.93 mas/yr

Galactic Cartesian (pc)

x = -0.482 · y = -0.570 · z = 0.666

Equatorial (J2000)

RA 229.77564° · Dec 41.73242°

Galactic ℓ, b

68.486° · 56.568°

Ecliptic λ, β

208.158° · 56.864°

HTM-20 index

-663154219

Observation Record

Photometric series

RV measurements

Stellar spectra