Epsilon Tauri b
| Exoplanet | List of exoplanets | |
|---|---|---|
 |
||
| Parent star | ||
| Star | Epsilon Tauri | |
| Constellation | Taurus | |
| Right ascension | (α) | 04h 28m 37.00s |
| Declination | (δ) | +19° 10′ 50″ |
| Apparent magnitude | (mV) | 3.53 |
| Distance | 155 ly (47.53 pc) |
|
| Spectral type | K0III | |
| Mass | (m) | 2.7 (± 0.1) M☉ |
| Radius | (r) | 12.692 (± 0.545) R☉ |
| Temperature | (T) | 4901 (± 20) K |
| Metallicity | [Fe/H] | 0.17 (± 0.04) |
| Age | 0.625 (± 0.05) Gyr | |
| Physical characteristics | ||
| Mass | (m) | 7.6 (± 0.2) MJ |
| Radius | (r) | ~1.18 RJ |
| Temperature | (T) | 541 K (268 °C; 514 °F) |
| Orbital elements | ||
| Semi-major axis | (a) | 1.93 (± 0.03) AU |
| Eccentricity | (e) | 0.151 (± 0.023) |
| Orbital period | (P) | 645.5 (± 5.3) d |
| Argument of periastron |
(ω) | 94.4 ± 7.4° |
| Time of periastron | (T0) | 2,452,879 ± 12 JD |
| Semi-amplitude | (K) | 98.5 ± 1.8 m/s |
| Discovery information | ||
| Discovery date | 7 February 2007 | |
| Discoverer(s) | Sato et al. | |
| Discovery method | Doppler spectroscopy | |
| Discovery status | Confirmed | |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
Epsilon Tauri b (abbreviated ε Tauri b or ε Tau b), also named Amateru, is a super-Jupiter exoplanet orbiting the K-type giant star Epsilon Tauri approximately 155 light-years (47.53 parsecs, or nearly 1.466×1015 km) away from the Earth in the constellation of Taurus. It orbits the star further out than Earth orbits the Sun. It has moderate eccentricity.
The planet orbits one of the four giant stars in the Hyades cluster that is 2.7 times the mass of our Sun, making it the most massive planet-harboring star. This provides evidence that it was an A-type star when it was on the main-sequence.
In July 2014 the International Astronomical Union (IAU) launched a process for giving proper names to certain exoplanets. The process involved public nomination and voting for the new names. In December 2015, the IAU announced the winning name was Amateru for this planet. The name was based on that submitted by the Kamagari Astronomical Observatory of Kure, Hiroshima Prefecture, Japan: namely 'Amaterasu', the Shinto goddess of the Sun, born from the left eye of the god Izanagi. The IAU substituted 'Amateru' - which is a common Japanese appellation for shrines when they enshrine Amaterasu - because 'Amaterasu' is already used for asteroid 10385 Amaterasu.
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