Gliese 777 b

Gliese 777 b

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)	3.92 AU (586 Gm)
Periastron	(q)	2.51 AU (375 Gm)
Apastron	(Q)	5.33 AU (798 Gm)
Eccentricity	(e)	0.36 ± 0.03
Orbital period	(P)	2891 ± 85 d (7.915 y)
Argument of periastron	(ω)	12.4 ± 9.3°
Time of periastron	(T0)	2,450,628.1 ± 99.8 JD
Semi-amplitude	(K)	23.5 ± 0.5 m/s
Physical characteristics
Minimum mass	(m sin i)	1.502 ± 0.13 MJ
Discovery information
Discovery date		19 June 2002
Discoverer(s)		Mayor et al.
Discovery method		Doppler spectroscopy
Discovery site		Haute-Provence
Discovery status		Published
Other designations
HD 190360(A)b
Database references
Extrasolar Planets Encyclopaedia		data
SIMBAD		data
Exoplanet Archive		data
Open Exoplanet Catalogue		data

Gliese 777 b, also known as Gliese 777 Ab or HD 190360 b, 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 2002 (by the Geneva Extrasolar Planet Search Team) using the radial velocity method. The planet is at least one half more massive than Jupiter but roughly the same size as Jupiter. Because the inclination of the planet's orbit is not known, the true mass is unknown. But it is unlikely to be much more than the given minimum mass.

The planet has one of the longest orbits currently known for an extrasolar planet. The planet's mean distance from the star is close to the distance between Jupiter and the Sun. However, unlike Jupiter it has an eccentric orbit. At periastron the distance between the planet and the star is only 2.51 AU and at apastron the distance is as much as 5.33 AU (compared to the Solar System, distance from the Sun to the inner asteroid belt and from Sun to just beyond the orbit of Jupiter).

The signal produced by the planet is very weak and the eccentricity was originally supposed to be very circular which led to speculations of a very Jupiter-like planet, with a system of several large moons like Jupiter itself. Fortunately, the inner system should be stable for Earth-like planets despite a known, smaller inner Neptune-like planet which is known to orbit the star at distance of 0.12 AU every 17 Earth days.