Key parameters at a glance

A radius of 12.50 Earth radii
A mass of 2,790.43 Earth masses
Surface gravity around 17.86 g
An orbital period of 428.500 days
Semi-major axis 1.1900 AU
Distance from Earth 130.10 light-years
Earth Similarity Index 0.400
Travel time at Voyager 1 speed 2,294,280 years

gam1 Leo b Planet Profile

Physical Specs

Radius

12.50 R⊕

Radius (Jupiter)

1.120 R♃

Mass

2,790.43 M⊕

Mass (Jupiter)

8.780 M♃

Density

7.85 g/cm³

Surface Gravity

17.86 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.400

HZ Position Unknown

Controversial No

Discovery

Year 2009

Method Radial Velocity

Facility Bohyunsan Optical Astronomical Observatory

Telescope 1.8 m Telescope

Size rank in cohort

Rank by radius

#1235of 1771

top 69.7%

This planet

12.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 156279 c 12.50 R⊕ HD 33283 b 12.50 R⊕ HD 156279 b 12.50 R⊕

Metric	Earth	gam1 Leo b	Jupiter
Radius (R⊕)	1.00	12.50	11.21
Mass (M⊕)	1.00	2,790.43	317.83
Density (g/cm³)	5.51	7.85	1.33
Surface Gravity (g)	1.00	17.86	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	2,790.430 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 89484

HIP

HIP 50583 A

TIC

TIC 95431294

System

gam Leo

Percentile among Gas Giant cohort

Radius 12.500 R⊕ · percentile 28 / cohort 1771

Mass 2,790.430 M⊕ · percentile 85 / cohort 1747

Orbital period 428.50 d · percentile 65 / cohort 1533

Distance 39.89 pc · percentile 14 / cohort 1759

ESI 0.400 · percentile 86 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

428.500 days

Semi-major axis

1.1900 AU

Eccentricity

0.144

Inclination

— °

Year Length

A year here lasts about 1.17 Earth years on a mildly elliptical path at a mean orbital distance of 1.1900 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.400

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Han et al. 2010

Instrument

BOES Echelle Spectrograph

Publication

2010-01

Observation locale

Ground

Host System: gam1 Leo

Spectral Class

K-type orange

Effective Temperature

4,330 K — cooler than the Sun (5,778 K)

Estimated Age

2.41 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

31.880 R☉

Stellar Mass

1.230 M☉

Metallicity [Fe/H]

-0.51

Extended Stellar Properties

Surface gravity (log g)

1.590 dex

Rotational v·sin i

2.70 km/s

Metallicity ratio

[Fe/H]

Distance

39.89 parsec

Light-years 130.10 ly

V-band magnitude

2.00 mag

Voyager-speed travel 2,294,280 yr

Multi-band Host Photometry — 10 bands

Astrometric Data

Parallax

25.070 mas

Total Proper Motion

346.598 mas/yr

PM Right Ascension

311.00 mas/yr

PM Declination

-153.00 mas/yr

Galactic Cartesian (pc)

x = -0.852 · y = 0.398 · z = 0.339

Equatorial (J2000)

RA 154.99321° · Dec 19.84139°

Galactic ℓ, b

216.552° · 54.652°

Ecliptic λ, β

149.611° · 8.815°

HTM-20 index

1970675528

Observation Record

Photometric series

RV measurements

Archive notes

Similar Worlds

HD 38801 b

Gas Giant · K-type orange

Radius 12.50 R⊕ · 298.2 ly

HD 86065 b

Gas Giant · K-type orange

Radius 12.50 R⊕ · 131.7 ly

HD 115404 A c

Gas Giant · K-type orange

Radius 12.50 R⊕ · 35.8 ly

HD 94890 c

Gas Giant · K-type orange

Radius 12.50 R⊕ · 201.2 ly

BD-08 2823 c

Gas Giant · K-type orange

Radius 12.50 R⊕ · 134.8 ly

HD 164604 c

Gas Giant · K-type orange

Radius 12.50 R⊕ · 128.4 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Bohyunsan Optical Astronomical Observatory Mission K-type orange Hosts