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HD 187123 c
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 187123</td></tr><tr> <td colspan="2">Constellation</td> <td>Cygnus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>19h 46m 58.1130s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+34° 25′ 10.288″</td></tr><tr><td colspan="2">Distance</td><td>156.28 ly
(47.92 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G5V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>4.80 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>3.60 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>6.00 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.249 ± 0.030</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>3700 ± 530 d
(10 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>14 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>250 ± 170°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,459,910 ± 610 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>25.1 ± 1.5 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>1.95 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>November 2006</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Wright et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>California, USA</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

HD 187123 c is an extrasolar planet located approximately 156 light-years away in the constellation of Cygnus, orbiting the star HD 187123. This planet was published in 2006. The radius of the planet's orbit is 4.80 AU, 113 times more distant from the star than first companion. This takes 10 years to orbit. As it is typical for very long-period planets, the orbit is eccentric, referring to as "eccentric Jupiter". At periastron, the orbital distance is 3.60 AU and at apastron, the distance is 6.00 AU. The planet's mass is nearly 2 times that of Jupiter, but is likely to be smaller in size than the inner planet.[1][2]

See alsoEdit

ReferencesEdit

  1. (2007). Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars. The Astrophysical Journal 657 (1): 533–545.
  2. (2009). Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems. The Astrophysical Journal 693 (2): 1084–1099.

External linksEdit

Coordinates: Sky map 19h 46m 58.1130s, +34° 25′ 10.288″


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