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51 Pegasi bball, officially Dimidiumball, is a hot Jupiterball located 50 light-years away from Earthball in the constellation of Pegasushorse. 51 Pegasi bball can into first exoplanetball discovered around a main-sequence starball.This planet was discovered by Didier Queloz and Michel Mayor.
After its discovery, Earthball confirmed the planetball's existence and obtained more observations of its properties. It was discovered that it orbits its parent in four days. It is much closer to it than Mercuryball is to Sunball, moves at an orbital speed of 136 km/s, and has about half of Jupiterball's clay. Due to its proximity, it was considered an anomaly. However, since then, numerous other hot Jupiterballs have been discovered, and Earthball has revised its theories of planetball formation to account for them by studying orbital migration.
Assuming the planetball is perfectly gray with no greenhouse or tidal effects and a Bond albedo of 0.1, the temperature would be 1,265 K. This is between the predicted temperatures of HD 189733 bball and HD 209458 bball (1,180 K–1,392 K), before they were measured.
Earthball originally said that 51 Pegasi bball was the stripped core of a brown dwarf of a decomposed starball and was therefore composed of heavy elements, but it is now believed to be a gas giantball. It is sufficiently massive that its thick atmosphere is not blown away by its parent's solar wind.
51 Pegasi bball is likely larger than Jupiterball despite having less clay. This is because its superheated atmosphere must be puffed up into a thick but tenuous layer surrounding it. Beneath this, the gases that make up the planetball would be so hot that the planetball would glow red. The atmopshere may into silicate clouds.