| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| 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 | ||
| Semimajor 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 periastron |
(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 K |
| Discovery information | ||
| Discovery date | 24 June 2005 | |
| Discoverer(s) | Marcy et al. | |
| Detection 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 June 2005 using the radial velocity method. 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).
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