HD 108147
Encyclopedia
HD 108147 is a 7th magnitude
star
in the constellation
of Crux
in direct line with and very near to the bright star Acrux or Alpha Crucis. It is either a yellow-white or yellow dwarf
(the line is arbitrary and the colour difference is only from classification, not real), slightly brighter and more massive than our Sun
. The spectral type is F8 V or G0 V. The star is also younger than the Sun. Due to its distance, about 130 light years, it is too dim to be visible with unaided eye; with binoculars
it is an easy target. However, due to its southerly location it is not visible in the northern hemisphere except for the tropics
.
An extrasolar planet
was detected orbiting it in 2000 by the Geneva Extrasolar Planet Search Team. This exoplanet is "a gas giant smaller than Jupiter
that screams around its primary [star] in 11 days at only 0.1 AU." This is much closer than the orbit of Mercury
in our solar system.
It should not be confused with HD 107148
, which also has an extrasolar planet discovered in 2006 in the Virgo constellation
.
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...
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....
of Crux
Crux
Crux is the smallest of the 88 modern constellations, but is one of the most distinctive. Its name is Latin for cross, and it is dominated by a cross-shaped asterism that is commonly known as the Southern Cross.-Visibility:...
in direct line with and very near to the bright star Acrux or Alpha Crucis. It is either a yellow-white or yellow dwarf
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
(the line is arbitrary and the colour difference is only from classification, not real), slightly brighter and more massive than our 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...
. The spectral type is F8 V or G0 V. The star is also younger than the Sun. Due to its distance, about 130 light years, it is too dim to be visible with unaided eye; with binoculars
Binoculars
Binoculars, field glasses or binocular telescopes are a pair of identical or mirror-symmetrical telescopes mounted side-by-side and aligned to point accurately in the same direction, allowing the viewer to use both eyes when viewing distant objects...
it is an easy target. However, due to its southerly location it is not visible in the northern hemisphere except for the tropics
Tropics
The tropics is a region of the Earth surrounding the Equator. It is limited in latitude by the Tropic of Cancer in the northern hemisphere at approximately N and the Tropic of Capricorn in the southern hemisphere at S; these latitudes correspond to the axial tilt of the Earth...
.
An extrasolar planet
Extrasolar planet
An extrasolar planet, or exoplanet, is a planet outside the Solar System. A total of such planets have been identified as of . It is now known that a substantial fraction of stars have planets, including perhaps half of all Sun-like stars...
was detected orbiting it in 2000 by the Geneva Extrasolar Planet Search Team. This exoplanet is "a gas giant smaller than Jupiter
Jupiter
Jupiter is the fifth planet from the Sun and the largest planet within the Solar System. It is a gas giant with mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in our Solar System combined. Jupiter is classified as a gas giant along with Saturn,...
that screams around its primary [star] in 11 days at only 0.1 AU." This is much closer than the orbit of Mercury
Mercury (planet)
Mercury is the innermost and smallest planet in the Solar System, orbiting the Sun once every 87.969 Earth days. The orbit of Mercury has the highest eccentricity of all the Solar System planets, and it has the smallest axial tilt. It completes three rotations about its axis for every two orbits...
in our solar system.
It should not be confused with HD 107148
HD 107148
HD 107148 is an 8th magnitude star located approximately 167 light years away in the constellation of Virgo. It is a yellow dwarf with a luminosity 1.41 times the Sun. It is twice as enriched with heavy elements than the Sun. In 2006, a discovery of Saturn-mass planet was announced...
, which also has an extrasolar planet discovered in 2006 in the Virgo constellation
Virgo (constellation)
Virgo is one of the constellations of the zodiac. Its name is Latin for virgin, and its symbol is . Lying between Leo to the west and Libra to the east, it is the second largest constellation in the sky...
.