» Extrasolar Planet Guide » Companions of Normal Stars » Gliese 777A » Gliese 777A c


Clarified Neptunian
Object Type: Clarified Neptunian
Parent Star: Gliese 777A (G6 IV+)
Discovery Status: Confirmed
Orbit of Gliese 777A c Current Planet
Habitability Zone Habitability Zone
Mass ( M sin i ): 0.057 Jupiters
Mean Distance: 0.128 AU
Orbital Period: 17.1 Days
Eccentricity: 0.01
Argument of Perihelion (omega):
153.7 °
System Age: 6700 Myr
Planet Appearance:
Blue and cloudless
Estimated Mean Temp: 717 Kelvin
Mean Angular Star Size: 4.986°
Gravitational Influence
(Hill Sphere):
0.003 AU / 520000 km
Max Stable Prograde Moon Orbit: 0.001 AU / 180000 km
Max Moon Mass: < 0.0001 Earths 1
1991.8656 x Phobos
Tidally locked if older than: 3.071 Gyr 2
Estimated Bond Albedo: ~ 0.1 3
Notes:
     1 inaccurate for planets with mass < 0.3 Jupiters
     2 orbit may be too eccentric for 1:1 tidal lock
     3 from Sudarsky et al. 2000
Year Discovered: 2005
Detection Method: Doppler Spectroscopy
Discovered By: VOGT S., BUTLER P., MARCY G., FISCHER D., HENRY G., LAUGHLIN G., WRIGHT J. & JOHNSON A.



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