Key parameters at a glance

A radius of 12.10 Earth radii
A mass of 6,547.00 Earth masses
Surface gravity around 44.72 g
An orbital period of 305.500 days
Semi-major axis 1.1700 AU
Distance from Earth 367.05 light-years
Earth Similarity Index 0.289
Travel time at Voyager 1 speed 6,472,859 years

tau Gem b Planet Profile

Physical Specs

Radius

12.10 R⊕

Radius (Jupiter)

1.080 R♃

Mass

6,547.00 M⊕

Mass (Jupiter)

20.600 M♃

Density

20.30 g/cm³

Surface Gravity

44.72 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.289

HZ Position Unknown

Controversial No

Discovery

Year 2013

Method Radial Velocity

Facility Lick Observatory

Telescope 0.6 m Coude Auxiliary Telescope

Size rank in cohort

Rank by radius

#1454of 1771

top 82.0%

This planet

12.10R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 62364 b 12.10 R⊕ HD 106515 A b 12.10 R⊕ BD+20 2457 b 12.10 R⊕

Metric	Earth	tau Gem b	Jupiter
Radius (R⊕)	1.00	12.10	11.21
Mass (M⊕)	1.00	6,547.00	317.83
Density (g/cm³)	5.51	20.30	1.33
Surface Gravity (g)	1.00	44.72	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	6,547.000 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 54719

HIP

HIP 34693

TIC

TIC 68984421

Gaia DR2

Gaia DR2 886479673643096448

Gaia DR3

Gaia DR3 886479673643853952

System

tau Gem

Percentile among Gas Giant cohort

Radius 12.100 R⊕ · percentile 16 / cohort 1771

Mass 6,547.000 M⊕ · percentile 97 / cohort 1747

Orbital period 305.50 d · percentile 61 / cohort 1533

Distance 112.54 pc · percentile 37 / cohort 1759

ESI 0.289 · percentile 55 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

305.500 days

Semi-major axis

1.1700 AU

Eccentricity

0.031

Inclination

— °

Year Length

A year here lasts approximately 305.50 Earth days (83.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 1.1700 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.289

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Mitchell et al. 2013

Instrument

Hamilton Echelle Spectrograph

Publication

2013-07

Observation locale

Ground

Host System: tau Gem

Spectral Class

K-type orange

Effective Temperature

4,388 K — cooler than the Sun (5,778 K)

Estimated Age

1.22 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

26.800 R☉

Stellar Mass

2.300 M☉

Metallicity [Fe/H]

0.14

Extended Stellar Properties

Surface gravity (log g)

1.960 dex

Systemic radial velocity

22.02 km/s

Rotational v·sin i

1.00 km/s

Metallicity ratio

[Fe/H]

Distance

112.54 parsec

Light-years 367.05 ly

V-band magnitude

4.38 mag

Voyager-speed travel 6,472,859 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

8.878 mas

Total Proper Motion

57.644 mas/yr

PM Right Ascension

-31.49 mas/yr

PM Declination

-48.28 mas/yr

Galactic Cartesian (pc)

x = -0.264 · y = 0.823 · z = 0.504

Equatorial (J2000)

RA 107.78472° · Dec 30.24495°

Galactic ℓ, b

187.219° · 17.199°

Ecliptic λ, β

105.440° · 7.754°

HTM-20 index

-1561231053

Similar Worlds

HD 184010 b

Gas Giant · K-type orange

Radius 12.10 R⊕ · 198.3 ly

KIC 3526061 b

Gas Giant · K-type orange

Radius 12.10 R⊕ · 1,308.6 ly

HIP 948 b

Gas Giant · K-type orange

Radius 12.10 R⊕ · 113.7 ly

HD 109988 b

Gas Giant · K-type orange

Radius 12.10 R⊕ · 138.7 ly

BD+20 2457 b

Gas Giant · K-type orange

Radius 12.10 R⊕ · 5,021.9 ly

HD 139357 b

Gas Giant · K-type orange

Radius 12.10 R⊕ · 365.6 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Lick Observatory Mission K-type orange Hosts