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- 51 Pegasi b (51 Peg b) is the first discovered planetary-mass companion of its parent star. After its discovery, many teams confirmed its existence and obtained more observations of its properties, including the fact that it orbits very close to the star, experiences estimated temperatures around 1200 °C, and has a minimum mass about half that of Jupiter. At the time, this close distance was not compatible with theories of planet formation and resulted in discussions of planetary migration. It has been assumed that the planet shares the star's inclination of 79 degrees. However, several "hot Jupiters" are now known to be oblique relative to the stellar axis.