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Gliese 777 c
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>Gliese 777 A</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>20h 03m 37.41s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+29° 53′ 48.50″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>5.71</td></tr><tr><td colspan="2">Distance</td><td>51.81 ly
(15.89 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G6IV</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.128 ± 0.002 AU
(19.1 Gm)</td></tr><tr><td> </td> <td style="text-align: center"> </td> <td>8.06 mas</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.127 AU
(19.0 Gm)</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.129 AU
(19.2 Gm)</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.01 ± 0.1</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>17.1 ± 0.015 d
(0.047 y)</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>153.7 ± 32°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,450,000.07 ± 0.9 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>4.6 ± 1.1 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>0.057 MJ
(18 M)</td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>~717 K</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>24 June 2005</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Marcy et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy</td></tr><tr> <td colspan="2">Discovery site</td> <td>Template:Country data United States</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

Other designations

Gliese 777 c, often catalogued as Gliese 777 Ac or simply HD 190360 c, is an extrasolar planet approximately 52 light-years away in the constellation of Cygnus. The planet was discovered orbiting the primary star of the Gliese 777 system in 2005 using the radial velocity method and confirmed in 2009.[1][2] The planet was once called the "smallest extrasolar planet discovered", but this is currently no longer the case. With a minimum mass just 18 times that of the Earth, the planet is likely a "hot Neptune" planet, a small Jovian planet, or possibly a large terrestrial planet (a super-Earth).

See also Edit

References Edit

  1. (2005). Five New Multicomponent Planetary Systems. The Astrophysical Journal 632 (1): 638–658.
  2. (2009). Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems. The Astrophysical Journal 693 (2): 1084–1099.

External links Edit

Template:Gliese 777 Template:Star systems within 50 – 55 light-years Coordinates: Sky map 20h 03m 37.41s, +29° 53′ 48.50″


de:Gliese 777#Gliese 777 Ac

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