Kappa Coronae Borealis
Encyclopedia
Kappa Coronae Borealis is a star
approximately 102 light years away in the constellation
of Corona Borealis
.The apparent magnitude
is +4.82 (4.17 trillion times fainter than the Sun) and the absolute magnitude
is +2.35 (9.82 times brighter than the Sun). It is an orange K-type subgiant star, meaning it has nearly completely exhausted its hydrogen
supply in its core.
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...
approximately 102 light years 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 Corona Borealis
Corona Borealis
Corona Borealis is a small constellation in the northern sky. Its name is Latin for "northern crown", a name inspired by its shape; its main stars form a semicircular arc. It was one of the 48 constellations listed by the 2nd century astronomer Ptolemy and remains one of the 88 modern...
.The 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...
is +4.82 (4.17 trillion times fainter than the Sun) and the absolute magnitude
Absolute magnitude
Absolute magnitude is the measure of a celestial object's intrinsic brightness. it is also the apparent magnitude a star would have if it were 32.6 light years away from Earth...
is +2.35 (9.82 times brighter than the Sun). It is an orange K-type subgiant star, meaning it has nearly completely exhausted its hydrogen
Hydrogen
Hydrogen is the chemical element with atomic number 1. It is represented by the symbol H. With an average atomic weight of , hydrogen is the lightest and most abundant chemical element, constituting roughly 75% of the Universe's chemical elemental mass. Stars in the main sequence are mainly...
supply in its core.
Planetary system
In October 2007, a giant planet was found by Johnson et al., who used the radial velocity method.See also
- HD 16175HD 16175HD 16175 is a 7th magnitude G-type star with temperature about 6000 K located approximately 195 light-years away in the Perseus constellation. This star is only visible through binoculars or better equipment...
- HD 167042HD 167042HD 167042 is a 6th magnitude K-type giant star located approximately 163 light-years away in Draco constellation. It has mass of 1.64 times that of the Sun and the age is only 2.2 billion years old...
- List of extrasolar planets
- Rho Coronae BorealisRho Coronae BorealisRho Coronae Borealis is a Solar twin, yellow dwarf star approximately 57 light-years away in the constellation of Corona Borealis. The star is thought to be similar to the Sun with nearly the same mass, radius, and luminosity. As of 1997, an extrasolar planet has been confirmed to be orbiting the...