9 Pegasi

9 Pegasi is a supergiant star in the constellation Pegasus. Its apparent magnitude is 4.35.
9 Pegasi is defined and used as an MK standard star for the spectral type G5 Ib. It is a yellow supergiant nearly two thousand times more luminous than the sun and sixty times larger. It has been reported to be slightly variable and is listed in the New [Catalogue of Suspected Variable Stars] with a magnitude range of 4.20 to 4.35.
9 Pegasi does not have a Bayer designation although it is brighter than several stars in Pegasus that do such as τ, φ, and σ Pegasi, because it was included in the constellation Battery of Volta, along with 1 Pegasi. It is the 9th star numbered by Flamsteed in order of right ascension. In the 1795 French-language Fortin-Flamsteed edition of the Atlas Coelestis, 9 Pegasi is labelled with the letter "g".