- Gliese 777
Starbox begin
name = Gliese 777 Starbox observe
epoch =J2000.0
constell = Cygnus
ra = RA|20|03|37.41
dec = DEC|+29|53|48.50
appmag_v = +5.71 / +14.40 Starbox character
class = G6IV / M4.5V
b-v = 0.749
u-b = Starbox astrometry
radial_v = -45.3
prop_mo_ra = 683.35 / 682
prop_mo_dec = -524.10 / -530
gal_lat = -00.6725
gal_lon = 067.4109
parallax = 62.92 / 56
p_error = .51 .42 171
dist_ly = 51.81
dist_pc = 15.89
absmag_v = +4.70 / +13.39 Starbox detail
age = 6700 million
metal = 1.38 × solar
mass = 0.9
radius = 1.2
rotation =
luminosity = 1.11
temperature = 5417 Starbox catalog
names = BD+29°3872, Gliese 777, HD 190360, HIP 98767, HR 7670 Starbox reference
Simbad = HD+190360Gliese 777, often abbreviated as Gl 777 and or GJ 777, is a
yellow subgiant approximately 52light-year s away in theconstellation of Cygnus. The system is also abinary star system made up of twostars and possibly a third. As of 2005, twoextrasolar planet s are known to orbit the primary star.Stellar components
The primary star of the system (cataloged as Gliese 777A) is a yellow subgiant, a
Sun -like star that is ceasing fusinghydrogen in its core. The star is much older than the Sun being about 6700 million years old. It is 4% less massive than the Sun. It is also rathermetal -rich having about 70% more "metals" (elements heavier thanhelium ) than the Sun, which is typical to stars with extrasolar planets.The secondary star (Gliese 777B) is a distant, dim
red dwarf star orbiting the primary at a distance of 3,000astronomical unit s. One orbit takes at least tens of thousands of years to complete. The star itself may be a binary, the secondary being a very dim red dwarf. Not much information is available on the star system.Planetary system
In 2002 a discovery of a long-period, wide-orbiting planet (
Gliese 777b ) was announced byMichel Mayor . The planet orbited in circular path and theorbital eccentricity was increased in later measurements (e=0.36). The planet was "Jupiter-twin" and was turned to "eccentric Jupiter " with mass about 1.5 times Jupiter and about the same size. In 2005 further observation of the star show another amplitude with a period of 17.1 days. This indicates one of the smallest discovered planet at the time. The mass was only 18 time more thanEarth or about same asNeptune with very low eccentricity. There was a METI message sent to Gliese 777. It was transmitted fromEurasia 's largestradar — 70-meterEupatoria Planetary Radar. The message was namedCosmic Call 1 , it was sent onJuly 1 1999, and it will arrive at Gliese 777 in April of2051 . [ru icon http://www.cplire.ru/rus/ra&sr/VAK-2004.html]PlanetboxOrbit
exoplanet = c
mass = >0.057 ± 0.19
period = 17.1 ± 0.015
semimajor = 0.128 ± 0.002
eccentricity = 0.01 ± 0.1PlanetboxOrbit
exoplanet = b
mass = >1.502 ± 0.13
period = 2891 ± 85
semimajor = 3.92 ± 0.17
eccentricity = 0.36 ± 0.03See also
*
47 Ursae Majoris
*51 Pegasi
*Gliese 229 References
*cite journal | url=http://www.aanda.org/articles/aa/full/2004/40/aa0390-04/aa0390-04.html | author=N. Asghari "et al." | title=Stability of terrestrial planets in the habitable zone of Gl 777 A, HD 72659, Gl 614, 47 Uma and HD 4208 | journal=
Astronomy & Astrophysics | volume=426 | year=2004 | issue=1 | pages=353–365 | doi=10.1051/0004-6361:20040390
*cite journal | url=http://www.aanda.org/articles/aa/full/2003/42/aa4076/aa4076.html | author=Naef "et al." | title=The ELODIE survey for northern extra-solar planets II. A Jovian planet on a long-period orbit around GJ 777 A | journal =Astronomy and Astrophysics | volume=410 | year=2003 | issue=3 | pages=1051–1054 | doi=10.1051/0004-6361:20031341
*cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/432901 | author=Vogt "et al." | title=Five New Multicomponent Planetary Systems| journal=TheAstrophysical Journal | year=2005 | volume=632 | issue=1 | pages=638–658 | doi=10.1086/432901External links
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* [http://www.lpl.arizona.edu/~rory/research/xsp/dynamics/ Extrasolar Planet Interactions] by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona
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