Gliese 674 (GJ 674) is a small
red dwarf star with an
exoplanetary companion in the southern
constellation of
Ara
ARA may refer to:
Media and the arts
* American-Romanian Academy of Arts and Sciences
* '' Artistička Radna Akcija'', compilation album released in former Yugoslavia
* Associate of the Royal Academy, denoting membership in the British Royal Aca ...
. It is too faint to be visible to the naked eye, having an
apparent visual magnitude
Apparent magnitude () is a measure of the brightness of a star or other astronomical object observed from Earth. An object's apparent magnitude depends on its intrinsic luminosity, its distance from Earth, and any extinction of the object's lig ...
of 9.38
[ and an ]absolute magnitude
Absolute magnitude () is a measure of the luminosity of a celestial object on an inverse logarithmic astronomical magnitude scale. An object's absolute magnitude is defined to be equal to the apparent magnitude that the object would have if it ...
of 11.09.[ The system is located at a distance of 14.8 light-years from the ]Sun
The Sun is the star at the center of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core. The Sun radiates this energy mainly as light, ultraviolet, and infrared radi ...
based on parallax measurements,[ It is a candidate member of the 200 million year old Castor stream of co-moving stars.][
This is a low-mass M-type main-sequence star with a stellar classification of M3V.][ The star is weakly ]active
Active may refer to:
Music
* ''Active'' (album), a 1992 album by Casiopea
* Active Records, a record label
Ships
* ''Active'' (ship), several commercial ships by that name
* HMS ''Active'', the name of various ships of the British Royal ...
and show star spots on a regular basis. Even low activity red dwarfs can flare
A flare, also sometimes called a fusée, fusee, or bengala in some Latin-speaking countries, is a type of pyrotechnic that produces a bright light or intense heat without an explosion. Flares are used for distress signaling, illumination, ...
, and in 2018 this star was observed emitting a hot ultraviolet flare with a total energy of and a duration of a few hours. GJ 674 is at an intermediate stage of spin-down with a rotation period of 33.4 days, suggesting an age of up to a few billion years.[ It is smaller and less massive than the Sun, and is radiating just 1.6%][
]
Planetary system
On January 7, 2007, Bonfils used the HARPS
The High Accuracy Radial Velocity Planet Searcher (HARPS) is a high-precision echelle planet-finding spectrograph installed in 2002 on the ESO's 3.6m telescope at La Silla Observatory in Chile. The first light was achieved in February 2003. ...
spectrograph in ESO
The European Organisation for Astronomical Research in the Southern Hemisphere, commonly referred to as the European Southern Observatory (ESO), is an intergovernmental research organisation made up of 16 member states for ground-based ast ...
and found an intermediate mass planet orbiting close to the red dwarf star in an eccentric orbit.[
]
See also
* List of nearest stars
This list covers all known stars, brown dwarfs, and sub-brown dwarfs within of the Sun. So far, 131 such objects have been found, of which only 22 are bright enough to be visible without a telescope. The visible light needs to reach or exce ...
* List of extrasolar planets
These are lists of exoplanets. Most of these were discovered by the Kepler space telescope. There are an additional 2,054 potential exoplanets from Kepler's first mission yet to be confirmed, as well as 978 from its " Second Light" mission and ...
References
External links
*
*
GJ 674
Catalog
Image Gliese 674
Notes
{{DEFAULTSORT:Gliese 674
M-type main-sequence stars
Planetary systems with one confirmed planet
Local Bubble
Ara (constellation)
CD-46 11540
0674
085523