Key parameters at a glance

A radius of 12.70 Earth radii
A mass of 1,938.70 Earth masses
Surface gravity around 12.02 g
An orbital period of 522.300 days
Semi-major axis 1.4000 AU
Distance from Earth 126.47 light-years
Earth Similarity Index 0.441
Travel time at Voyager 1 speed 2,230,229 years

bet UMi b Planet Profile

Physical Specs

Radius

12.70 R⊕

Radius (Jupiter)

1.140 R♃

Mass

1,938.70 M⊕

Mass (Jupiter)

6.100 M♃

Density

5.20 g/cm³

Surface Gravity

12.02 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.441

HZ Position Unknown

Controversial No

Discovery

Year 2014

Method Radial Velocity

Facility Bohyunsan Optical Astronomical Observatory

Telescope 1.8 m Telescope

Size rank in cohort

Rank by radius

#1130of 1771

top 63.7%

This planet

12.70R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 168863 b 12.70 R⊕ HD 233604 b 12.70 R⊕ Kepler-424 c 12.70 R⊕

Metric	Earth	bet UMi b	Jupiter
Radius (R⊕)	1.00	12.70	11.21
Mass (M⊕)	1.00	1,938.70	317.83
Density (g/cm³)	5.51	5.20	1.33
Surface Gravity (g)	1.00	12.02	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	1,938.700 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 131873

HIP

HIP 72607

TIC

TIC 229540730

System

bet UMi

Percentile among Gas Giant cohort

Radius 12.700 R⊕ · percentile 34 / cohort 1771

Mass 1,938.700 M⊕ · percentile 79 / cohort 1747

Orbital period 522.30 d · percentile 68 / cohort 1533

Distance 38.77 pc · percentile 13 / cohort 1759

ESI 0.441 · percentile 98 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

522.300 days

Semi-major axis

1.4000 AU

Eccentricity

0.190

Inclination

— °

Year Length

A year here lasts about 1.43 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)

0.441

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Lee et al. 2014

Instrument

BOES Echelle Spectrograph

Publication

2014-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2014 at Bohyunsan Optical Astronomical Observatory (2 shown).

bet Cnc b · Gas Giant mu Leo b · Gas Giant

Host System: bet UMi

Spectral Class

K-type orange

Effective Temperature

4,126 K — cooler than the Sun (5,778 K)

Estimated Age

2.95 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

38.300 R☉

Stellar Mass

1.400 M☉

Metallicity [Fe/H]

-0.27

Extended Stellar Properties

Surface gravity (log g)

1.500 dex

Systemic radial velocity

16.90 km/s

Rotational v·sin i

1.70 km/s

Metallicity ratio

[Fe/H]

Distance

38.77 parsec

Light-years 126.47 ly

V-band magnitude

2.06 mag

Voyager-speed travel 2,230,229 yr

Multi-band Host Photometry — 10 bands

Astrometric Data

Parallax

25.790 mas

Total Proper Motion

34.416 mas/yr

PM Right Ascension

-32.29 mas/yr

PM Declination

11.91 mas/yr

Galactic Cartesian (pc)

x = -0.201 · y = -0.185 · z = 0.962

Equatorial (J2000)

RA 222.67650° · Dec 74.15555°

Galactic ℓ, b

112.647° · 40.503°

Ecliptic λ, β

133.315° · 72.988°

HTM-20 index

238659801

Similar Worlds

HD 168863 b

Gas Giant · K-type orange

Radius 12.70 R⊕ · 130.1 ly

HD 27894 d

Gas Giant · K-type orange

Radius 12.70 R⊕ · 142.9 ly

HIP 56640 b

Gas Giant · K-type orange

Radius 12.70 R⊕ · 399.0 ly

eps CrB b

Gas Giant · K-type orange

Radius 12.70 R⊕ · 227.9 ly

HIP 67851 c

Gas Giant · K-type orange

Radius 12.70 R⊕ · 209.1 ly

HD 113996 b

Gas Giant · K-type orange

Radius 12.70 R⊕ · 379.4 ly

Explore Related Categories

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