Gliese 777

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+190360

Gliese 777, often abbreviated as Gl 777 and or GJ 777, is a yellow subgiant approximately 52 light-years away in the constellation of Cygnus. The system is also a binary star system made up of two stars and possibly a third. As of 2005, two extrasolar planets 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 fusing hydrogen 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 rather metal-rich having about 70% more "metals" (elements heavier than helium) 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 3,000 astronomical units. 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 by Michel Mayor. The planet orbited in circular path and the orbital 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 than Earth or about same as Neptune with very low eccentricity. There was a METI message sent to Gliese 777. It was transmitted from Eurasia's largest radar — 70-meter Eupatoria Planetary Radar. The message was named Cosmic Call 1, it was sent on July 1 1999, and it will arrive at Gliese 777 in April of 2051. [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 ± 0.1
PlanetboxOrbit
exoplanet = b
mass = >1.502 ± 0.13
period = 2891 ± 85
semimajor = 3.92 ± 0.17
eccentricity = 0.36 ± 0.03

See 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=The Astrophysical Journal| year=2005 | volume=632 | issue=1 | pages=638–658 | doi=10.1086/432901

External links

*
*
* [http://www.lpl.arizona.edu/~rory/research/xsp/dynamics/ Extrasolar Planet Interactions] by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Gliese 777 — A/B Données d observation (Époque J2000.0) Ascension droite 20h 03m 37,41/26,58s Déclinaison +29° 53/51′ 48,5/59,5″ Constellation Cygne Magnitude apparente …   Wikipédia en Français

  • Gliese 777 — A/B Constelación Cygnus Ascensión recta α A 20h 03min 37,41s B 20h 03min 26,52s Declinación δ A +29º 53’ 48,5’’ B +29º 52’ 00,1’’ …   Wikipedia Español

  • Gliese 777 ac — Étoile Nom Gliese 777 A Ascension droite 20h 03m 37.41s Déclinaison +29° 53′ 48.50″ Type spectral G6IV Constellation …   Wikipédia en Français

  • Gliese 777 ab — Étoile Nom Gliese 777 A Ascension droite 20h 03m 37.41s Déclinaison +29° 53′ 48.50″ Type spectral G6IV Constellation …   Wikipédia en Français

  • Gliese 777 Ac — Étoile Nom Gliese 777 A Ascension droite 20h 03m 37.41s Déclinaison +29° 53′ 48.50″ Type spectral G6IV Constellation Cygne …   Wikipédia en Français

  • Gliese 777 Ab — Étoile Nom Gliese 777 A Ascension droite 20h 03m 37.41s Déclinaison +29° 53′ 48.50″ Type spectral G6IV Constellation Cygne …   Wikipédia en Français

  • Gliese 777 c — Descubrimiento Descubridor Marcy et al. en Fecha …   Wikipedia Español

  • Gliese 777 Ab — ist ein Exoplanet, der den gelben Zwerg Gliese 777 A alle 2891 Tage umkreist. Auf Grund seiner hohen Masse wird angenommen, dass es sich um einen Gasplaneten handelt. Inhaltsverzeichnis 1 Entdeckung 2 Umlauf und Masse 3 Klima und Zusammense …   Deutsch Wikipedia

  • Gliese 777 Ac — ist ein Exoplanet, der den gelben Zwerg Gliese 777 A alle 17,1 Tage umkreist. Auf Grund seiner hohen Masse wird angenommen, dass es sich um einen Gasplaneten handelt. Inhaltsverzeichnis 1 Entdeckung 2 Umlauf und Masse 3 Klima und Zusammense …   Deutsch Wikipedia

  • Gliese 777 — Datenbanklinks zu Gliese 777 Doppelstern Gliese 777 (GJ 777) …   Deutsch Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”