Epsilon Tauri b
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | Epsilon Tauri | |
| Constellation | Taurus | |
| Right ascension | (α) | 04h 28m 37.00s[1] |
| Declination | (δ) | +19° 10′ 49.5″[1] |
| Distance | 147 ± 2[1] ly (45.0 ± 0.5[1] pc) | |
| Spectral type | K0III | |
| 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 |
| Physical characteristics | ||
| Mass | (m) | > 7.6 ± 0.2 MJ |
| Discovery information | ||
| Discovery date | 7 February 2007 | |
| Discoverer(s) | Sato et al. | |
| Discovery method | Doppler spectroscopy | |
| Discovery status | Confirmed | |
Epsilon Tauri b (abbreviated ε Tauri b or ε Tau b), also named Amateru, is an extrasolar planet approximately 147 light-years away[1] in the constellation of Taurus. The massive planet was discovered in orbit around the star Epsilon Tauri. It orbits the star further out than Earth orbits the Sun. It has moderate eccentricity.[2]
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 launched a process for giving proper names to certain exoplanets.[3] The process involved public nomination and voting for the new names.[4] In December 2015, the IAU announced the winning name was Amateru for this planet.[5] 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 an asteroid (10385 Amaterasu).[6]
See also
References
- 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
- ↑ Sato, Bun'ei; et al. (2007). "A Planetary Companion to the Hyades Giant ε Tauri". The Astrophysical Journal 661 (1): 527–531. Bibcode:2007ApJ...661..527S. doi:10.1086/513503.
- ↑ NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014
- ↑ NameExoWorlds The Process
- ↑ Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015.
- ↑ NameExoWorlds The Approved Names
External links
- "Notes for planet eps Tau b". The Extrasolar Planets Encyclopaedia. Retrieved 2008-06-24.
Coordinates: 
04h 28m 37.0s, +19° 10′ 49″