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Gliese 777 c
Discovery
Discovered by	Marcy et al.
Discovery site	United States
Discovery date	24 June 2005
Detection method	Doppler spectroscopy
Orbital characteristics
Apastron	0.129 AU (19,300,000 km)
Periastron	0.127 AU (19,000,000 km)
Semi-major axis	0.128 ± 0.002 AU (19,150,000 ± 300,000 km)
Eccentricity	0.01 ± 0.1
Orbital period (sidereal)	17.1 ± 0.015 d; 0.047 y
Time of periastron	2,450,000.07 ± 0.9
Argument of periastron	153.7 ± 32
Semi-amplitude	4.6 ± 1.1
Star	Gliese 777 A
Physical characteristics
Temperature	~717

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).

References

^ Vogt, Steven S.; et al. (2005). "Five New Multicomponent Planetary Systems" (PDF). The Astrophysical Journal. 632 (1): 638–658. Bibcode:2005ApJ...632..638V. doi:10.1086/432901. S2CID 16509245. Archived (PDF) from the original on 2018-07-22. Retrieved 2020-09-03.
^ 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. arXiv:0812.1582. Bibcode:2009ApJ...693.1084W. doi:10.1088/0004-637X/693/2/1084. S2CID 18169921.