What is a double star in the Pleiades (21 k and 22 l Pleiadum, of the 5.8 and 6.4 magnitude respectively), appearing as a single star of the 5.3 magnitude to the naked eye called?

asterope — (Astron.) A double star in the Pleiades (21 k and 22 l Pleiadum, of the 5.8 and 6.4 magnitude respectively), appearing as a single star of the 5.3 magnitude to the naked eye. (Webster's 1913.)

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