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Gliese 876 e
Extrasolar planet List of extrasolar planets
300px
Artist's concept of Gliese 876 e
Parent star

<tr> <td colspan="2">Star</td> <td>Gliese 876</td></tr><tr> <td colspan="2">Constellation</td> <td>Aquarius</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>22h 53m 16.73s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>−14° 15′ 49.3″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>10.17</td></tr><tr><td colspan="2">Distance</td><td>15.3 ly
(4.72 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>M4V</td></tr><tr> <td>Mass</td> <td style="text-align: center">(m)</td> <td>0.334 ± 0.030 M</td></tr><tr> <td>Radius</td> <td style="text-align: center">(r)</td> <td>0.36 R</td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>3350 ± 300 K</td></tr><tr> <td>Metallicity</td> <td style="text-align: center">[Fe/H]</td> <td>0.05 ± 0.20</td></tr><tr> <td>Age</td> <td style="text-align: center"></td> <td>0.1–5.0 Gyr</td></tr>

Orbital elements
Epoch HJD 2,450,602.093

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.3343 ± 0.0013 [1] AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.055 ± 0.012 [1]</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>124.26 ± 0.70 [1] d</td></tr><tr> <td>Inclination</td> <td style="text-align: center">(i)</td> <td>59.5 [1]°</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>239 ± 22 [1]°</td></tr><tr> <td>Mean anomaly</td> <td style="text-align: center">(M)</td> <td>335 ± 24 [1]°</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>3.42 ± 0.39 [1] m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>14.6 ± 1.7 [1] M</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>June 23, 2010</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Rivera 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 [1]</td></tr> <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>

File:Gliese876Orbits.svg
Gliese 876 e is an exoplanet orbiting the star Gliese 876 in the constellation of Aquarius. It is in a 1:2:4 Laplace resonance with the planets Gliese 876 c and Gliese 876 b: for each orbit of planet e, planet b completes two orbits and planet c completes four. This configuration is the second known example of a Laplace resonance after Jupiter's moons Io, Europa and Ganymede.[1]

Gliese 876 e has a mass similar to that of the planet Uranus. Its orbit takes 124 days to complete, or roughly one third of a year. While the orbital period is longer than that of Mercury around the Sun, the lower mass of the host star relative to the Sun means the planet's orbit has a slightly smaller semimajor axis. Unlike Mercury, Gliese 876 e has a nearly circular orbit with an eccentricity of 0.055 ± 0.012.[1]

This planet, like b and c, has likely migrated inward.[2]

ReferencesEdit

  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 (July 2010)The Lick-Carnegie Exoplanet Survey: A Uranus-mass Fourth Planet for GJ 876 in an Extrasolar Laplace Configuration. The Astrophysical Journal 719 (1): 890–899.
  2. (2012). Can GJ 876 host four planets in resonance?.

Template:Gliese 876


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