Eta
2 Hydri b (η
2 Hyi b, η
2 Hydri b), commonly known as HD 11977 b, is an
extrasolar planet that is approximately 217
light-year
A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (), or 5.88 trillion miles ().One trillion here is taken to be 1012 ...
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 origins of the e ...
of
Hydrus. The presence of the planet around an intermediately massive
giant star provides indirect evidence for the existence of
planetary system
A planetary system is a set of gravitationally
In physics, gravity () is a fundamental interaction which causes mutual attraction between all things with mass or energy. Gravity is, by far, the weakest of the four fundamental interacti ...
s around A-type stars.
References
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External links
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Hydrus (constellation)
Giant planets
Exoplanets discovered in 2005
Exoplanets detected by radial velocity
{{extrasolar-planet-stub