Gliese 678
Encyclopedia
Gliese 678 is a spectroscopic binary star
system approximately 60 light-year
s away in the constellation
of Ophiuchus.
This system is in the Zeta Herculis moving group
, which is of low metallicity stars, 5 billion years old. Besides ζ Herculis, the group includes δ Trianguli
, ζ Reticuli
, 1 Hydrae, Gl 456, φ2 Pavonis
, and GJ 9079.
This binary was included in a search for brown dwarf
s that turned up no large companions.
Binary star
A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star, comes, or secondary...
system approximately 60 light-year
Light-year
A light-year, also light year or lightyear is a unit of length, equal to just under 10 trillion kilometres...
s away in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
of Ophiuchus.
This system is in the Zeta Herculis moving group
Zeta Herculis Moving Group
Zeta Herculis Moving Group is a set of stars that share a common motion through space.The existence of this moving group was first published in 1958 by Olin J. Eggen. Based upon the high velocity motion of the star Zeta Herculis through space, he searched for stars that were following a similar...
, which is of low metallicity stars, 5 billion years old. Besides ζ Herculis, the group includes δ Trianguli
Delta Trianguli
Delta Trianguli is a spectroscopic binary star system approximately away in the constellation of Triangulum. The primary star is a yellow dwarf, while the secondary star is thought to be an orange dwarf...
, ζ Reticuli
Zeta Reticuli
Zeta Reticuli is a binary star system located about away from Earth. It is located in the constellation Reticulum, and is visible to the unaided eye in very dark skies...
, 1 Hydrae, Gl 456, φ2 Pavonis
Phi2 Pavonis
Phi² Pavonis , also known as HD 196378, is a yellow-white dwarf star approximately 82 light-years away in the constellation of Pavo . It is evolving into a subgiant....
, and GJ 9079.
This binary was included in a search for brown dwarf
Brown dwarf
Brown dwarfs are sub-stellar objects which are too low in mass to sustain hydrogen-1 fusion reactions in their cores, which is characteristic of stars on the main sequence. Brown dwarfs have fully convective surfaces and interiors, with no chemical differentiation by depth...
s that turned up no large companions.