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51 Pegasi b
51 Pegasi b
(abbreviated
51 Peg b
), unofficially dubbed
Bellerophon
, later named
Dimidium
, is an
extrasolar planet
approximately 50
light-years
away in the
constellation
of
Pegasus
. It was the first
exoplanet
to be discovered orbiting a
main-sequence
star, the
Sun-like
51 Pegasi
, and marked a breakthrough in astronomical research. It is the prototype for a class of planets called
hot Jupiters
.
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