30 Arietis
   HOME

TheInfoList



Click Here for Items Related To - 30 Arietis
OR:
30 Arietis on:   [Wikipedia]   [Google]   [Amazon]

30 Arietis (abbreviated 30 Ari) is a 6th- apparent-magnitude multiple star system in the
constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The first constellati ...
of Aries. ''30 Arietis'' is the Flamsteed designation. 30 Arietis A and B are separated by or about at a distance of 130
light year A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distance, astronomical distances and is equal to exactly , which is approximately 9.46 trillion km or 5.88 trillion mi. As defined by t ...
s away. The main components of both systems are both binaries with a composite spectra belonging to F-type main-sequence stars, meaning they are fusing
hydrogen Hydrogen is a chemical element; it has chemical symbol, symbol H and atomic number 1. It is the lightest and abundance of the chemical elements, most abundant chemical element in the universe, constituting about 75% of all baryon, normal matter ...
in their cores. The 30 Arietis system is 910 million years old, one fifth the age of the Sun.


Star system

30 Arietis A and B are separated by 38.1", corresponding to 1,500 AU at a distance of 130
light year A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distance, astronomical distances and is equal to exactly , which is approximately 9.46 trillion km or 5.88 trillion mi. As defined by t ...
s. The pair are at almost the same distance, have very similar proper motions, and are considered almost certain to be gravitationally bound with a likely period around 34,000 years. The main components of both systems are both binaries with a composite spectra belonging to F-type main-sequence stars, meaning they are fusing
hydrogen Hydrogen is a chemical element; it has chemical symbol, symbol H and atomic number 1. It is the lightest and abundance of the chemical elements, most abundant chemical element in the universe, constituting about 75% of all baryon, normal matter ...
in their cores. 30 Arietis A is a spectroscopic binary with an orbital period of 1.1 days. The primary Aa is an F-type main sequence star about 31% more massive than the Sun, while the companion Ab is a faint red dwarf only about 15% the mass of the Sun. 30 Arietis B has been reported to have a red dwarf companion at a distance of and another red dwarf Bb at about . In 2020, after the inclination of the planetary orbit was measured, the "planet" was found to fall in the mass range of a brown or
red dwarf A red dwarf is the smallest kind of star on the main sequence. Red dwarfs are by far the most common type of fusing star in the Milky Way, at least in the neighborhood of the Sun. However, due to their low luminosity, individual red dwarfs are ...
. The more distant companion was referred to as C to distinguish it from Bb, and at about 0.5" it has been imaged using adaptive optics.


30 Arietis Bb

30 Arietis Bb (sometimes abbreviated 30 Ari Bb) is a
red dwarf A red dwarf is the smallest kind of star on the main sequence. Red dwarfs are by far the most common type of fusing star in the Milky Way, at least in the neighborhood of the Sun. However, due to their low luminosity, individual red dwarfs are ...
which orbits the F-type
main sequence In astronomy, the main sequence is a classification of stars which appear on plots of stellar color index, color versus absolute magnitude, brightness as a continuous and distinctive band. Stars on this band are known as main-sequence stars or d ...
star A star is a luminous spheroid of plasma (physics), plasma held together by Self-gravitation, self-gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night sk ...
30 Arietis Ba, located in a quintuple star system approximately 146
light year A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distance, astronomical distances and is equal to exactly , which is approximately 9.46 trillion km or 5.88 trillion mi. As defined by t ...
s away in the
constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The first constellati ...
Aries. The
red dwarf A red dwarf is the smallest kind of star on the main sequence. Red dwarfs are by far the most common type of fusing star in the Milky Way, at least in the neighborhood of the Sun. However, due to their low luminosity, individual red dwarfs are ...
, initially believed to be a massive planet or brown dwarf, was announced in a paper published online on September 24, 2009. It was discovered by using precision radial velocity measurements from the echelle spectrograph installed on the Alfred-Jensch telescope in Karl Schwarzschild Observatory. The star had a minimum mass of nearly 10 times that of
Jupiter Jupiter is the fifth planet from the Sun and the List of Solar System objects by size, largest in the Solar System. It is a gas giant with a Jupiter mass, mass more than 2.5 times that of all the other planets in the Solar System combined a ...
. In 2020, after the inclination of the planetary orbit was measured to be just 4.14°, the "planet" was found to fall in the mass range of red dwarf stars.


See also

* HD 114762 b * HD 114762


References


External links


Image 30 Arietis

Double stars

NASA diagram of the 30 Ari System
{{Sky, 02, 36, 00.5237, +, 24, 38, 50.000, 128.6 Aries (constellation) F-type main-sequence stars 5 Arietis, 30 Arietis, 30 0764/5 016232/46 BD+24 0375 012184/9 M-type main-sequence stars