Astronomy:Gliese 777 c

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Gliese 777 c
Discovered byMarcy et al.
Discovery site United States
Discovery date24 June 2005
Doppler spectroscopy
Orbital characteristics
Apastron0.129 AU (19,300,000 km)
Periastron0.127 AU (19,000,000 km)
0.128 ± 0.002 AU (19,150,000 ± 300,000 km)
Eccentricity0.01 ± 0.1
Orbital period17.1 ± 0.015 d
0.047 y
Time of periastron2,450,000.07 ± 0.9
153.7 ± 32
Semi-amplitude4.6 ± 1.1
StarGliese 777 A
Physical characteristics

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


  1. Vogt, Steven S. et al. (2005). "Five New Multicomponent Planetary Systems". The Astrophysical Journal 632 (1): 638–658. doi:10.1086/432901. Bibcode2005ApJ...632..638V. 
  2. Wright, J. T. et al. (2009). "Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems". The Astrophysical Journal 693 (2): 1084–1099. doi:10.1088/0004-637X/693/2/1084. Bibcode2009ApJ...693.1084W. 

External links

Coordinates: Sky map 20h 03m 37.41s, +29° 53′ 48.50″

de:Gliese 777#Gliese 777 Ac