It is 101 light years from Earth, and has an apparent magnitude of +1.73, and belongs to the spectral classification B7. A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... 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. ... 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. ...