HD 142022
Encyclopedia
HD 142022 is a binary star system located in the southernmost constellation
of Octans
located at a distance
of 117 ly. The primary star (HD 142022 A) has a spectral type of G9V and has apparent magnitude
of 7.69. Its mass is 1% less than the Sun
but the radius is only 70.5%. The star is old, only 400 million years younger than the Universe
itself. It is a Population I star with metallicity of 55% greater than solar.
The primary star has a single known planet
, discovered in 2005.
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 Octans
Octans
Octans is a faint constellation the southern sky. Its name is Latin for the eighth part of a circle, but it is named after the octant, a navigational instrument. The constellation was devised by Nicolas Louis de Lacaille in the eighteenth century....
located at a distance
Cosmic distance ladder
The cosmic distance ladder is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are "close enough" to Earth...
of 117 ly. The primary star (HD 142022 A) has a spectral type of G9V and has apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of 7.69. Its mass is 1% less than 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...
but the radius is only 70.5%. The star is old, only 400 million years younger than the Universe
Universe
The Universe is commonly defined as the totality of everything that exists, including all matter and energy, the planets, stars, galaxies, and the contents of intergalactic space. Definitions and usage vary and similar terms include the cosmos, the world and nature...
itself. It is a Population I star with metallicity of 55% greater than solar.
The primary star has a single known planet
Planetary system
A planetary system consists of the various non-stellar objects orbiting a star such as planets, dwarf planets , asteroids, meteoroids, comets, and cosmic dust...
, discovered in 2005.