Epsilon Tauri b

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Epsilon Tauri b
Extrasolar planet List of extrasolar planets
Planet Epsilon Tauri b.png
Artist's conception of Epsilon Tauri b, extrasolar planet.
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
Semimajor axis (a) 1.93 ± 0.03 AU
Eccentricity (e) 0.151 ± 0.023
Orbital period (P) 645.5 ± 5.3 d
Argument of
(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 is an extrasolar planet approximately 147 light-years away[1] in the constellation of Taurus. The massive planet was discovered in orbit around 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 a main-sequence.

See also[edit]


  1. ^ a b c d e 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
  2. ^ 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. 

External links[edit]

Coordinates: Sky map 04h 28m 37.0s, +19° 10′ 49″