= 51 Pegasi
{c}
<51 Pegasi> is a Sun-like <star> whose radial-velocity variations led <Michel Mayor> and <Didier Queloz> to infer a close planetary companion in 1995. The discovery of <51 Pegasi b> showed that a giant planet can orbit much closer to a normal <star> than the giant planets of the Solar System do.
The measured signal was the <star>'s changing line-of-sight <velocity>, inferred from shifts in its spectrum. The planet was inferred through the <star>'s reflex motion, rather than seen as a resolved bright point. Orbital inclination enters the <mass> inference, so a radial-velocity <amplitude> alone generally constrains a minimum <mass>.<A Jupiter-mass companion to a solar-type star by Michel Mayor and Didier Queloz>[Abstract and radial-velocity inference]{ref}
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