Key parameters at a glance

A radius of 13.50 Earth radii
A mass of 535.54 Earth masses
Surface gravity around 2.94 g
An orbital period of 510.900 days
Semi-major axis 1.4000 AU
Distance from Earth 341.08 light-years
Earth Similarity Index 0.352
Travel time at Voyager 1 speed 6,015,019 years

HD 180902 b Planet Profile

Physical Specs

Radius

13.50 R⊕

Radius (Jupiter)

1.200 R♃

Mass

535.54 M⊕

Mass (Jupiter)

1.685 M♃

Density

1.20 g/cm³

Surface Gravity

2.94 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.352

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

#671of 1771

top 37.8%

This planet

13.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 45350 b 13.50 R⊕ HD 82943 b 13.50 R⊕ HD 27442 b 13.50 R⊕

Metric	Earth	HD 180902 b	Jupiter
Radius (R⊕)	1.00	13.50	11.21
Mass (M⊕)	1.00	535.54	317.83
Density (g/cm³)	5.51	1.20	1.33
Surface Gravity (g)	1.00	2.94	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	535.544 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 180902

HIP

HIP 94951

TIC

TIC 11782681

Gaia DR2

Gaia DR2 6770721346051487872

Gaia DR3

Gaia DR3 6770721346051487872

System

HD 180902

Percentile among Gas Giant cohort

Radius 13.500 R⊕ · percentile 59 / cohort 1771

Mass 535.544 M⊕ · percentile 50 / cohort 1747

Orbital period 510.90 d · percentile 68 / cohort 1533

Distance 104.58 pc · percentile 35 / cohort 1759

ESI 0.352 · percentile 72 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

510.900 days

Semi-major axis

1.4000 AU

Eccentricity

0.107

Inclination

— °

Year Length

A year here lasts about 1.40 Earth years on a mildly elliptical path at a mean orbital distance of 1.4000 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.352

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 HD 136418 b · Gas Giant HIP 79431 b · Gas Giant HD 206610 b · Gas Giant HD 4313 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 180902

Spectral Class

K-type orange

Effective Temperature

4,961 K — cooler than the Sun (5,778 K)

Estimated Age

2.80 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

4.160 R☉

Stellar Mass

1.410 M☉

Metallicity [Fe/H]

0.04

Extended Stellar Properties

Surface gravity (log g)

3.360 dex

Systemic radial velocity

-3.16 km/s

Rotational v·sin i

1.36 km/s

Metallicity ratio

[Fe/H]

Distance

104.58 parsec

Light-years 341.08 ly

V-band magnitude

7.78 mag

Voyager-speed travel 6,015,019 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

9.534 mas

Total Proper Motion

42.869 mas/yr

PM Right Ascension

37.84 mas/yr

PM Declination

-20.15 mas/yr

Galactic Cartesian (pc)

x = 0.311 · y = -0.862 · z = -0.400

Equatorial (J2000)

RA 289.82396° · Dec -23.55824°

Galactic ℓ, b

14.399° · -16.330°

Ecliptic λ, β

288.113° · -1.357°

HTM-20 index

1113737795

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes

Similar Worlds

Kepler-46 c

Gas Giant · K-type orange

Radius 13.50 R⊕ · 2,534.4 ly

HD 222076 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 297.3 ly

HD 128311 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 53.3 ly

BD+48 740 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 2,174.1 ly

HD 81688 b

Gas Giant · K-type orange

Radius 13.50 R⊕ · 279.6 ly

HD 47366 c

Gas Giant · K-type orange

Radius 13.50 R⊕ · 275.1 ly

Explore Related Categories

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