52 Hertz
The 52-hertz whale, colloquially referred to as 52 Blue, is an individual whale of unidentified species that calls at the unusual frequency of 52 hertz. This pitch is at a higher frequency than that of the other whale species with migration patterns most closely resembling the 52-hertz whale's – the blue whale (10 to 39 Hz) and the fin whale (20 Hz). Its call has been detected regularly in many locations since the late 1980s and appears to be the only individual emitting a whale call at this frequency. However, the whale itself has never been sighted; it has only been heard via hydrophones. It has been described as the "world's loneliest whale", though potential recordings of a second 52-hertz whale, heard elsewhere at the same time, have been sporadically found since 2010.
52 Hz is equivalent to the musical note G#1, which is the 12th lowest key on a conventional 88-key piano keyboard; or, the 4th finger position on the lowest string (E1) of a double bass.
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