γ Pegasi is a Beta Cephei variable star that lies at the lower left-hand corner of the square of Pegasus. Its apparent magnitude varies between +2.80 and +2.86 with a period of 3.6 hours. It is 470 light-years distant and belonges to the spectral type B2. The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequenly refined in terms of other characteristics. ...
α Persei, also called Mirfak, is a star in the constellation Perseus. It has an apparent magnitude of +1.84, belongs to the spectral type F5, and is 112 light-years distant. Right ascension (RA; symbol α: Greek letter alpha) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... In astronomy declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ... Mirfak (also known as Algenib, and designated α Persei) is the brightest star in the constellation of Perseus. ... For the constellation, see Perseus (constellation); for the Macedonian king, see Perseus of Macedon Perseus with the Head of Medusa Perseus was the son of Danae, the only child of Acrisius king of Argos. ...
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