HD 154857 b is an
extrasolar planet
An exoplanet or extrasolar planet is a planet outside the Solar System. The first confirmed detection of an exoplanet was in 1992 around a pulsar, and the first detection around a main-sequence star was in 1995. A different planet, first detect ...
approximately 224
light year
A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distance, astronomical distances and is equal to exactly , which is approximately 9.46 trillion km or 5.88 trillion mi. As defined by t ...
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 first constellati ...
of
Ara
Ara may refer to:
Biology
* ''Ara'' (bird), a genus of parrots
* Ara (fish) (''Niphon spinosus''), a species of fish
* L-arabinose operon, also known as ara
Places
* Ara (mountain), a mountain in Armenia
* Ara, Armenia, a village in Armenia
...
. This is a
gas giant
A gas giant is a giant planet composed mainly of hydrogen and helium. Jupiter and Saturn are the gas giants of the Solar System. The term "gas giant" was originally synonymous with "giant planet". However, in the 1990s, it became known that Uranu ...
mass that orbits the star in an eccentric orbit. This planet was detected by using
Anglo-Australian Telescope
The Anglo-Australian Telescope (AAT) is a 3.9-metre Equatorial mount, equatorially mounted telescope operated by the Australian Astronomical Observatory and situated at the Siding Spring Observatory, Australia, at an altitude of a little over 1, ...
(AAT) UCLE
spectrometer
A spectrometer () is a scientific instrument used to separate and measure Spectrum, spectral components of a physical phenomenon. Spectrometer is a broad term often used to describe instruments that measure a continuous variable of a phenomeno ...
.
References
External links
*
Simulation HD 154857 bnews.bbc.co.uk
Ara (constellation)
Exoplanets discovered in 2004
Giant planets
Exoplanets detected by radial velocity
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