HD 100777 b
Encyclopedia
HD 100777 b is an extrasolar planet
located approximately 172 light-year
s away in the constellation
of Leo
, orbiting the star
HD 100777
. This is a >1.17 MJ planet
taking 33.15 Ms
to orbit at 154.1 Gm or 4.99 μpc from the star at 36% eccentricity
. The velocity of the orbit
is 29.3 km/s. Dominique Naef discovered this planet in March 2007 by using HARPS spectrograph
located in Chile
.
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...
located approximately 172 light-year
Light-year
A light-year, also light year or lightyear is a unit of length, equal to just under 10 trillion kilometres...
s 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 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:...
, orbiting the 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...
HD 100777
HD 100777
HD 100777 is an orange subgiant star located approximately 172 light years away in the constellation Leo. The apparent magnitude is 8.42 and absolute magnitude is 4.81. It is also called HIP 56572. In 2007, a planet was found to be orbiting the star....
. This is a >1.17 MJ planet
Planet
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,...
taking 33.15 Ms
Megasecond
A megasecond is 1 million seconds, or roughly 11.6 days. There are roughly 31.5 megaseconds in a year. This page lists times between 1 and 1000 megaseconds , or 11.6 days and 31.7 years.*shorter times-1 year:...
to orbit at 154.1 Gm or 4.99 μpc from the star at 36% eccentricity
Orbital eccentricity
The orbital eccentricity of an astronomical body is the amount by which its orbit deviates from a perfect circle, where 0 is perfectly circular, and 1.0 is a parabola, and no longer a closed orbit...
. The velocity of the orbit
Orbital velocity
Orbital velocity can refer to the following:* The orbital speed of a body in a gravitational field.* The velocity of particles due to wave motion, in particular in wind waves....
is 29.3 km/s. Dominique Naef discovered this planet in March 2007 by using HARPS spectrograph
Spectrograph
A spectrograph is an instrument that separates an incoming wave into a frequency spectrum. There are several kinds of machines referred to as spectrographs, depending on the precise nature of the waves...
located in Chile
Chile
Chile ,officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...
.