Key parameters at a glance

A radius of 12.30 Earth radii
A mass of 4,684.81 Earth masses
Surface gravity around 30.97 g
An orbital period of 516.220 days
Semi-major axis 1.5300 AU
Distance from Earth 408.74 light-years
Earth Similarity Index 0.332
Travel time at Voyager 1 speed 7,208,164 years

11 UMi b Planet Profile

Physical Specs

Radius

12.30 R⊕

Radius (Jupiter)

1.090 R♃

Mass

4,684.81 M⊕

Mass (Jupiter)

14.740 M♃

Density

13.80 g/cm³

Surface Gravity

30.97 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.332

HZ Position Unknown

Controversial No

Discovery

Year 2009

Method Radial Velocity

Facility Thueringer Landessternwarte Tautenburg

Telescope 2.0 m Alfred Jensch Telescope

Size rank in cohort

Rank by radius

#1349of 1771

top 76.1%

This planet

12.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HAT-P-13 c 12.30 R⊕ HD 22781 b 12.30 R⊕ CHXR 73 b 12.30 R⊕

Metric	Earth	11 UMi b	Jupiter
Radius (R⊕)	1.00	12.30	11.21
Mass (M⊕)	1.00	4,684.81	317.83
Density (g/cm³)	5.51	13.80	1.33
Surface Gravity (g)	1.00	30.97	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	4,684.814 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 136726

HIP

HIP 74793

TIC

TIC 230061010

Gaia DR2

Gaia DR2 1696798367260229376

Gaia DR3

Gaia DR3 1696798367260229376

System

11 UMi

Percentile among Gas Giant cohort

Radius 12.300 R⊕ · percentile 22 / cohort 1771

Mass 4,684.814 M⊕ · percentile 93 / cohort 1747

Orbital period 516.22 d · percentile 68 / cohort 1533

Distance 125.32 pc · percentile 40 / cohort 1759

ESI 0.332 · percentile 66 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

516.220 days

Semi-major axis

1.5300 AU

Eccentricity

0.080

Inclination

— °

Year Length

A year here lasts about 1.41 Earth years on a nearly circular orbit at a mean orbital distance of 1.5300 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.332

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Dollinger et al. 2009

Instrument

Coude Echelle Spectrograph

Publication

2009-10

Observation locale

Ground

Discovery cohort

Planets confirmed in 2009 at Thueringer Landessternwarte Tautenburg (2 shown).

HD 32518 b · Gas Giant HD 8673 b · Gas Giant

Host System: 11 UMi

Spectral Class

K-type orange

Effective Temperature

4,213 K — cooler than the Sun (5,778 K)

Estimated Age

1.56 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

29.790 R☉

Stellar Mass

2.780 M☉

Metallicity [Fe/H]

-0.02

Extended Stellar Properties

Surface gravity (log g)

1.930 dex

Systemic radial velocity

-17.52 km/s

Rotational v·sin i

1.50 km/s

Metallicity ratio

[Fe/H]

Distance

125.32 parsec

Light-years 408.74 ly

V-band magnitude

5.01 mag

Voyager-speed travel 7,208,164 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

7.954 mas

Total Proper Motion

10.679 mas/yr

PM Right Ascension

3.43 mas/yr

PM Declination

10.11 mas/yr

Galactic Cartesian (pc)

x = -0.204 · y = -0.236 · z = 0.950

Equatorial (J2000)

RA 229.27460° · Dec 71.82394°

Galactic ℓ, b

108.719° · 41.044°

Ecliptic λ, β

141.643° · 74.958°

HTM-20 index

773434278

Similar Worlds

SR 12 AB c

Gas Giant · K-type orange

Radius 12.30 R⊕ · 366.3 ly

2MASS J22362452+4751425 b

Gas Giant · K-type orange

Radius 12.30 R⊕ · 226.9 ly

HD 158996 b

Gas Giant · K-type orange

Radius 12.30 R⊕ · 925.2 ly

HD 22781 b

Gas Giant · K-type orange

Radius 12.30 R⊕ · 106.3 ly

HD 4760 b

Gas Giant · K-type orange

Radius 12.30 R⊕ · 1,754.3 ly

AB Pic b

Gas Giant · K-type orange

Radius 12.30 R⊕ · 163.2 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Thueringer Landessternwarte Tautenburg Mission K-type orange Hosts