Delta Cephei
name=dezeeuw1999>de Zeeuw P.T. et al 1999. A Hipparchus census of the nearby OB associations. Astronomical Journal  117 (1): 354–399. </ref> close enough for the precise Hubble Space Telescope/Hipparcos parallaxes to give a good result. As a result, it is known as a "fundamental distance calibrator", or absolute candle. Delta Cephei is a classical, or type I, Cepheid variable.