Key parameters at a glance

A radius of 12.70 Earth radii
A mass of 2,285.19 Earth masses
Surface gravity around 14.17 g
An orbital period of 585.820 days
Semi-major axis 1.8780 AU
Distance from Earth 155.02 light-years
Earth Similarity Index 0.429
Travel time at Voyager 1 speed 2,733,727 years

Context from the literature

Epsilon Tauri b, formally named Amateru, is a super-Jupiter exoplanet orbiting the K-type giant star Epsilon Tauri approximately 146 light-years away from the Earth in the constellation of Taurus. It orbits the star further out than Earth orbits the Sun. It has moderate eccentricity.

Excerpted from Wikipedia · full article

eps Tau b Planet Profile

Physical Specs

Radius

12.70 R⊕

Radius (Jupiter)

1.130 R♃

Mass

2,285.19 M⊕

Mass (Jupiter)

7.190 M♃

Density

6.13 g/cm³

Surface Gravity

14.17 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.429

HZ Position Unknown

Controversial No

Discovery

Year 2006

Method Radial Velocity

Facility Okayama Astrophysical Observatory

Telescope 1.88 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	eps Tau b	Jupiter
Radius (R⊕)	1.00	12.70	11.21
Mass (M⊕)	1.00	2,285.19	317.83
Density (g/cm³)	5.51	6.13	1.33
Surface Gravity (g)	1.00	14.17	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	2,285.186 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 28305

HIP

HIP 20889

TIC

TIC 17554529

Gaia DR2

Gaia DR2 48026706557926528

Gaia DR3

Gaia DR3 48026706558487040

System

eps Tau

Percentile among Gas Giant cohort

Radius 12.700 R⊕ · percentile 34 / cohort 1771

Mass 2,285.186 M⊕ · percentile 82 / cohort 1747

Orbital period 585.82 d · percentile 70 / cohort 1533

Distance 47.53 pc · percentile 18 / cohort 1759

ESI 0.429 · percentile 94 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

585.820 days

Semi-major axis

1.8780 AU

Eccentricity

0.076

Inclination

— °

Year Length

A year here lasts about 1.60 Earth years on a nearly circular orbit at a mean orbital distance of 1.8780 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.429

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Sato et al. 2007

Instrument

HIDES Echelle Spectrograph

Publication

2007-05

Observation locale

Ground

Host System: eps Tau

Spectral Class

K-type orange

Effective Temperature

4,877 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

12.350 R☉

Stellar Mass

2.570 M☉

Metallicity [Fe/H]

0.10

Extended Stellar Properties

Surface gravity (log g)

2.660 dex

Rotational v·sin i

2.50 km/s

Metallicity ratio

[Fe/H]

Distance

47.53 parsec

Light-years 155.02 ly

V-band magnitude

3.52 mag

Voyager-speed travel 2,733,727 yr

Multi-band Host Photometry — 7 bands

Astrometric Data

Parallax

21.040 mas

Total Proper Motion

113.890 mas/yr

PM Right Ascension

108.17 mas/yr

PM Declination

-35.64 mas/yr

Galactic Cartesian (pc)

x = 0.367 · y = 0.870 · z = 0.329

Equatorial (J2000)

RA 67.15466° · Dec 19.18028°

Galactic ℓ, b

177.597° · -19.923°

Ecliptic λ, β

68.462° · -2.567°

HTM-20 index

-1786690997

Observation Record

Photometric series

RV measurements

Archive notes

Wikipedia → Image: Wikimedia Commons · Tyrogthekreeper at en.wikipedia · CC BY-SA 3.0

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 Okayama Astrophysical Observatory Mission K-type orange Hosts