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81 Ceti b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>81 Ceti</td></tr><tr> <td colspan="2">Constellation</td> <td>Cetus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>02h 37m 41.80s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–03° 23′ 46.2″[1]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>5.65</td></tr><tr><td colspan="2">Distance</td><td>300 ± 10[1] ly
(93 ± 4[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G5III</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>2.5 AU
(370 Gm)</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>2.0 AU
(300 Gm)</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>3.0 AU
(440 Gm)</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.206 ± 0.029</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>952.7 ± 8.8 d
(2.608 y)</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>175 ± 69°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2486 ± 26 JD</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>5.3 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>July 3, 2008</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>Published</td></tr>

Other designations
HD 16400 b

<tr style="background-color: #A0B0FF;"><td align=center colspan=3>Database references</td></tr><tr valign=baseline><td colspan=2>Extrasolar Planets
Encyclopaedia
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

81 Ceti b (abbreviated 81 Cet b) is an extrasolar planet approximately 300 light years away in the constellation of Cetus. It orbits the G-type giant star 81 Ceti at an average distance of 2.5 AU, taking about 2.6 years to revolve with 20.6% eccentricity.[2] This planet was discovered on July 3, 2008 by Sato et al., who used Doppler Spectroscopy and found the wobbling of the star caused by the planet’s gravity during its revolution.

See alsoEdit

ReferencesEdit

  1. 1.0 1.1 1.2 1.3 (2007). Validation of the new Hipparcos reduction. Astronomy and Astrophysics 474 (2): 653–664. Vizier catalog entry
  2. (2008). Planetary Companions to Evolved Intermediate-Mass Stars: 14 Andromedae, 81 Ceti, 6 Lyncis, and HD167042. Publications of the Astronomical Society of Japan 60 (6): 1317–1326.

External linksEdit

Coordinates: Sky map 02h 37m 41.8003s, −03° 23′ 46.229″


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