The two most widely used classifications are described below:===Tholen classification===The most widely used taxonomy for over a decade has been that of David J. Tholen, first proposed in 1984.
Čez 5.500 let se bo pomaknil v bližino zvezde α Cep (α Cephei, zvezda z imenom Alderamin), čez 12.000 let bo zvezda Vega (α Lyr ali α Lyrae) označevala severni nebesni pol.