Pherkad vs RR Lyrae
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Pherkad
Pherkad, or Gamma Ursae Minoris, is a naked-eye star in the northern constellation Ursa Minor. It is a white A-type giant and, with Kochab, forms the pair at the outer end of the Little Dipper's bowl, an easily recognized part of the constellation. Pherkad has an apparent visual magnitude of about 3 and lies roughly 487 light-years from the Sun, so it is visible without optical aid but is not the...
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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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