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.[2] In 2021, the inclination of Gliese 777 Ab was measured via astrometry, allowing the true mass of 1.8 MJ to be determined.[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 2.57 AU and at apastron the distance is as much as 5.23 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. 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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Gliese777, often abbreviated as Gl 777 or GJ 777, is a binary star approximately 52 light-years away in the constellation of Cygnus. The system is also...
Gliese777b, also known as Gliese777 Ab or HD 190360 b, is an extrasolar planet approximately 52 light-years away in the constellation of Cygnus. The...
Gliese777 c, often catalogued as Gliese777 Ac or simply HD 190360 c, is an extrasolar planet approximately 52 light-years away in the constellation of...
Jeffrey; Shectman, Stephen; Thompson, Ian (2018-02-08). "New Constraints on Gliese 876 -- Exemplar of Mean-Motion Resonance". The Astronomical Journal. 155...
inclination and true mass of HD 70642 b were determined via astrometry. 55 Cancri d Gliese777b HD 28185 b Mu Arae e Pi Mensae b Carter, Brad D.; et al. (2003)...
W. Archived from the original on 8 October 2017. Retrieved 9 May 2014. Gliese, W.; Jahreiß, H. (1991). "Gl 559". Preliminary Version of the Third Catalogue...
failed to detect any stellar companions to Gliese 367. It hosts three known exoplanets, Gliese 367 b, c & d. Gliese 367's age is unclear. Modelling using stellar...
findings in 1838 with a value of 369.0 ±19.1 mas to A and 260.5 ±18.8 to B, and estimated the center point to be at 313.6 ±13.6. This corresponds to...
exoplanet is Iota Draconis b, which masses 9.40 MJ (i.e. 9.4 times the mass of Jupiter); the least massive confirmed planet is Gliese 581 e, which masses 0...
Gliese 806 is a star in the northern constellation of Cygnus, located about a degree to the southeast of the bright star Deneb. It is invisible to the...
classification Cancer in Chinese astronomy Kepler-186 Lists of exoplanets Gliese 1132 b – rocky exoplanet with a confirmed atmosphere Mu Arae c – At constellation...
GJ 1245 (Gliese 1245) is a double star with components G 208-44 and G 208-45, located 15.2 light-years (4.7 parsecs) away in the constellation Cygnus....
the Solar System, has three planets (b, c and d). The nearest system with four or more confirmed planets is Gliese 876, with four known.[citation needed]...
Resonance". The Astrophysical Journal. 777 (1): 3. arXiv:1304.4283. Bibcode:2013ApJ...777....3N. doi:10.1088/0004-637X/777/1/3. S2CID 59933168. Mass was revised...
In 2023, the inclination and true mass of HD 70642 b were determined via astrometry. Gliese777 HD 28185 Pi Mensae HIP 11915 Lists of exoplanets Vallenari...
"ocean-like" planet. Models have been proposed for Gliese 581 d that could include surface oceans. Gliese 436 b is speculated to have an ocean of "hot ice"....
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