Key parameters at a glance

A radius of 13.20 Earth radii
A mass of 807.29 Earth masses
Surface gravity around 4.63 g
An orbital period of 564.100 days
Semi-major axis 1.5920 AU
Distance from Earth 392.66 light-years
Earth Similarity Index 0.386
Travel time at Voyager 1 speed 6,924,602 years

HD 181342 b Planet Profile

Physical Specs

Radius

13.20 R⊕

Radius (Jupiter)

1.180 R♃

Mass

807.29 M⊕

Mass (Jupiter)

2.540 M♃

Density

1.93 g/cm³

Surface Gravity

4.63 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.386

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

#847of 1771

top 47.8%

This planet

13.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 12661 c 13.20 R⊕ HD 37605 b 13.20 R⊕ MOA-2009-BLG-387L b 13.20 R⊕

Metric	Earth	HD 181342 b	Jupiter
Radius (R⊕)	1.00	13.20	11.21
Mass (M⊕)	1.00	807.29	317.83
Density (g/cm³)	5.51	1.93	1.33
Surface Gravity (g)	1.00	4.63	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	807.288 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 181342

HIP

HIP 95124

TIC

TIC 12192000

Gaia DR2

Gaia DR2 6770761168986617600

Gaia DR3

Gaia DR3 6770761168986617600

System

HD 181342

Percentile among Gas Giant cohort

Radius 13.200 R⊕ · percentile 49 / cohort 1771

Mass 807.288 M⊕ · percentile 62 / cohort 1747

Orbital period 564.10 d · percentile 69 / cohort 1533

Distance 120.39 pc · percentile 38 / cohort 1759

ESI 0.386 · percentile 81 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

564.100 days

Semi-major axis

1.5920 AU

Eccentricity

0.022

Inclination

— °

Year Length

A year here lasts about 1.54 Earth years on a nearly circular orbit at a mean orbital distance of 1.5920 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.386

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 212771 b · Gas Giant HD 136418 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 181342

Spectral Class

K-type orange

Effective Temperature

4,945 K — cooler than the Sun (5,778 K)

Estimated Age

2.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

4.710 R☉

Stellar Mass

1.690 M☉

Metallicity [Fe/H]

0.26

Extended Stellar Properties

Surface gravity (log g)

3.280 dex

Systemic radial velocity

-0.70 km/s

Rotational v·sin i

3.33 km/s

Metallicity ratio

[Fe/H]

Distance

120.39 parsec

Light-years 392.66 ly

V-band magnitude

7.55 mag

Voyager-speed travel 6,924,602 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

8.278 mas

Total Proper Motion

55.505 mas/yr

PM Right Ascension

-46.60 mas/yr

PM Declination

-30.16 mas/yr

Galactic Cartesian (pc)

x = 0.317 · y = -0.859 · z = -0.401

Equatorial (J2000)

RA 290.26741° · Dec -23.61970°

Galactic ℓ, b

14.505° · -16.728°

Ecliptic λ, β

288.507° · -1.473°

HTM-20 index

1102461252

Observation Record

Photometric series

RV measurements

Stellar spectra

Similar Worlds

KMT-2024-BLG-1209L b

Gas Giant · K-type orange

Radius 13.20 R⊕ · 12,817.9 ly

HD 37605 b

Gas Giant · K-type orange

Radius 13.20 R⊕ · 152.6 ly

OGLE-2003-BLG-235L b

Gas Giant · K-type orange

Radius 13.20 R⊕ · 18,917.0 ly

HD 1502 b

Gas Giant · K-type orange

Radius 13.20 R⊕ · 622.8 ly

HD 12661 c

Gas Giant · K-type orange

Radius 13.20 R⊕ · 123.4 ly

HD 145457 b

Gas Giant · K-type orange

Radius 13.20 R⊕ · 441.3 ly

Explore Related Categories

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