HD 81040
Encyclopedia
HD 81040 is a star
in the constellation
of Leo
. It is G-type yellow dwarf
like our Sun
.
The Sun dwarfs HD 81040 in terms of physical characteristics. The age of the star is not precisely known; the ELODIE spectrograph
suggested 0.8 Gyr and found it to have a young dust disk. Later measurements by modelling chromosperic
activity suggested an age of 4.18 Gyr.
was announced by Sozzetti.
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 Leo
Leo (constellation)
Leo is one of the constellations of the zodiac. Its name is Latin for lion. Its symbol is . Leo lies between dim Cancer to the west and Virgo to the east.-Stars:...
. It is G-type yellow dwarf
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...
like 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 Sun dwarfs HD 81040 in terms of physical characteristics. The age of the star is not precisely known; the ELODIE spectrograph
ELODIE spectrograph
ELODIE was an echelle type spectrograph installed at the Observatoire de Haute-Provence 1.93m reflector in south-eastern France for the . Its optical instrumentation was developed by André Baranne from the Marseille Observatory. The purpose of this instrument was extrasolar planet detection by the...
suggested 0.8 Gyr and found it to have a young dust disk. Later measurements by modelling chromosperic
Chromosphere
The chromosphere is a thin layer of the Sun's atmosphere just above the photosphere, roughly 2,000 kilometers deep....
activity suggested an age of 4.18 Gyr.
Planetary system
On November 24, 2005, a superjovian planetPlanet
A planet is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.The term planet is ancient, with ties to history, science,...
was announced by Sozzetti.