WASP-4 is a
G-type main sequence star approximately 891
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
Phoenix.
Despite its advanced age, the star is rotating rapidly, being spun up by the tides raised by a giant planet on close orbit.
Planetary system
In 2007 the
extrasolar planet WASP-4b was discovered orbiting this star. With an orbital period of just 1.3 days it is classified as a
hot Jupiter.
The planetary orbit is subject to rapid decay, with decay timescale of 15.77 million years. Another
superjovian planet in the system is suspected.
[
]
See also
* SuperWASP
* List of extrasolar planets
References
External links
*
*
Phoenix (constellation)
G-type main-sequence stars
Planetary systems with one confirmed planet
Planetary transit variables
4
J23341508-4203411
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