Gliese 777 b

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Gliese 777 b
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) 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 France Haute-Provence
Discovery status Published
Other designations
Database references
Extrasolar Planets
Encyclopaedia
data
SIMBAD 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.[1]

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 our Solar system, distance from 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.

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