Gliese 777 c

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Gliese 777 c
Exoplanet List of exoplanets
Parent star
Star Gliese 777 A
Constellation Cygnus
Right ascension (α) 20h 03m 37.41s
Declination (δ) +29° 53′ 48.50″
Apparent magnitude (mV) 5.71
Distance 51.81 ly
(15.89 pc)
Spectral type G6IV
Orbital elements
Semi-major axis (a) 0.128 ± 0.002 AU
(19.1 Gm)
    8.06 mas
Periastron (q) 0.127 AU
(19.0 Gm)
Apastron (Q) 0.129 AU
(19.2 Gm)
Eccentricity (e) 0.01 ± 0.1
Orbital period (P) 17.1 ± 0.015 d
(0.047 y)
Argument of
(ω) 153.7 ± 32°
Time of periastron (T0) 2,450,000.07 ± 0.9 JD
Semi-amplitude (K) 4.6 ± 1.1 m/s
Physical characteristics
Minimum mass (m sin i) 0.057 MJ
(18 M)
Temperature (T) ~717
Discovery information
Discovery date 24 June 2005
Discoverer(s) Marcy et al.
Discovery method Doppler spectroscopy
Discovery site  United States
Discovery status Published
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]


  1. ^ Vogt, Steven S.; et al. (2005). "Five New Multicomponent Planetary Systems". The Astrophysical Journal. 632 (1): 638–658. Bibcode:2005ApJ...632..638V. doi:10.1086/432901. 
  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. Bibcode:2009ApJ...693.1084W. arXiv:0812.1582Freely accessible. doi:10.1088/0004-637X/693/2/1084. 

External links[edit]

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