23 Librae
Encyclopedia
23 Librae is a yellow dwarf
star
in the constellation
Libra
, and is about 83.7 light-years from the Sun
. 23 Lib has a mass
of 1.05 suns
and a radius
of 1.25 suns. 23 Librae was also featured in Halo: The Cole Protocol
was announced orbiting 23 Librae, and in 2009 an additional planet was detected.
Yellow dwarf
A G-type main-sequence star , often called a yellow dwarf, is a main-sequence star of spectral type G and luminosity class V. Such a star has about 0.8 to 1.2 solar masses and surface temperature of between 5,300 and 6,000 K., Tables VII, VIII...
star
Star
A star is a massive, luminous sphere of plasma held together by gravity. At the end of its lifetime, a star can also contain a proportion of degenerate matter. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth...
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....
Libra
Libra (constellation)
Libra is a constellation of the zodiac. Its name is Latin for weighing scales, and its symbol is . It is fairly faint, with no first magnitude stars, and lies between Virgo to the west and Scorpius to the east.-Notable features:]...
, and is about 83.7 light-years from the Sun
Sun
The Sun is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma interwoven with magnetic fields...
. 23 Lib has a mass
Mass
Mass can be defined as a quantitive measure of the resistance an object has to change in its velocity.In physics, mass commonly refers to any of the following three properties of matter, which have been shown experimentally to be equivalent:...
of 1.05 suns
Solar mass
The solar mass , , is a standard unit of mass in astronomy, used to indicate the masses of other stars and galaxies...
and a radius
Radius
In classical geometry, a radius of a circle or sphere is any line segment from its center to its perimeter. By extension, the radius of a circle or sphere is the length of any such segment, which is half the diameter. If the object does not have an obvious center, the term may refer to its...
of 1.25 suns. 23 Librae was also featured in Halo: The Cole Protocol
Halo: The Cole Protocol
Halo: The Cole Protocol is the sixth novel adaptation of the Halo science fiction franchise. The book was written by Tobias S. Buckell and published on November 25, 2008...
Planetary system
In 1999 an exoplanet 23 Librae b23 Librae b
23 Librae b is an extrasolar Jovian planet discovered in 1999 orbiting the star 23 Librae. It orbits in its star's habitable zone....
was announced orbiting 23 Librae, and in 2009 an additional planet was detected.
See also
- 61 Virginis
- HD 1461HD 1461HD 1461 is a G0V class star slightly more massive than the Sun , located about 76 light-years away in the constellation of Cetus.As of December 2009, HD 1461 is now the largest main sequence star with a possible Super-Earth around it....
- HD 12661HD 12661|- bgcolor="#FFFAFA"HD 12661 is a yellow star in the constellation of Aries. It has two known extrasolar planets. It is 114 light years from Earth.-Planetary system:...
- HD 37124HD 37124HD 37124 is a yellow dwarf star approximately 110 light-years away in the constellation of Taurus . As of 2005, three extrasolar planets have been confirmed to orbit the star. This system is currently one of the only that contains multiple planet that are not hot Jupiters and are either near or...
- HD 177830HD 177830HD 177830 is a 7th magnitude star located approximately 190 light-years away in the constellation of Lyra. It is slightly more massive than our Sun, but cooler being a type K star. Therefore it is a subgiant clearly more evolved than the Sun. In visual light it is four times brighter than the Sun,...
- HD 25171HD 25171HD 25171 is a main sequence FY Star with a single planetary companion known since December 2009....
- List of extrasolar planets