Yildun vs RR Lyrae
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Yildun
Yildun, formally designated Delta Ursae Minoris, is a white A-type main-sequence star in the northern constellation Ursa Minor. It lies in the handle of the Little Dipper, not in the bowl, and has an apparent magnitude of about 4.4. At a distance of roughly 170 light-years, it is close to the north celestial pole compared with many bright stars, although it is not the pole star. Yildun can be seen...
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RR Lyrae
RR Lyrae is a variable star in the constellation Lyra and the prototype of the RR Lyrae class of pulsating variable stars. These stars regularly expand and contract in size and brightness over periods typically lasting less than a day. Because their intrinsic luminosity is predictable, astronomers use them as standard candles to calculate distances to globular clusters and the galactic halo.
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