Gliese 777 Ac

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Gliese 777 Ac
Extrasolar planet Lists of extrasolar planets
Orbital elements
Semimajor axis (a) 0.128 ± 0.002 AU
Eccentricity (e) 0.01 ± 0.1
Orbital period (P) 17.1 ± 0.015 d
Inclination (i)  ?°
Longitude of
periastron
(ω) 153.7 ± 32°
Time of periastron (τ) 2,450,000.07 ±0.9 JD
Physical characteristics
Mass (m) >0.057 MJ (18 ME)
Radius (r)  ? RJ
Density (ρ)  ? kg/m3
Temperature (T) ~717 K
Discovery information
Discovery date 2005
Discoverer(s) Marcy et al.
Detection method Doppler Spectroscopy
Discovery status Published

Gliese 777 Ac is one of the smallest extrasolar planets discovered to date with a minimum mass just 18 times that of the Earth. It is likely a "hot Neptune", a small gas giant, or possibly a rocky "super-Earth".

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