Epsilon Tauri b
Extrasolar planet List of extrasolar planets
Artist's conception of Epsilon Tauri b, extrasolar planet.
Parent star

<tr> <td colspan="2">Star</td> <td>Epsilon Tauri</td></tr><tr> <td colspan="2">Constellation</td> <td>Taurus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>04h 28m 37.00s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+19° 10′ 49.5″[1]</td></tr><tr><td colspan="2">Distance</td><td>147 ± 2[1] ly
(45.0 ± 0.5[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K0III</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.93 ± 0.03 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.151 ± 0.023</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>645.5 ± 5.3 d</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>94.4 ± 7.4°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,452,879 ± 12 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>98.5 ± 1.8 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>> 7.6 ± 0.2 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>7 February 2007</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Sato et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy</td></tr><tr> <td colspan="2">Discovery status</td> <td>Confirmed</td></tr>

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

References Edit

  1. 1.0 1.1 1.2 1.3 1.4 (2007). Validation of the new Hipparcos reduction. Astronomy and Astrophysics 474 (2): 653–664. Vizier catalog entry
  2. (2007). A Planetary Companion to the Hyades Giant ε Tauri. The Astrophysical Journal 661 (1): 527–531.

External links Edit

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

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