Leda (/ˈliːdə/ LEE-də; Greek: Λήδα) also known as Jupiter XIII is a prograde irregular satellite of Jupiter. It was discovered by Charles T. Kowal at the Mount Palomar Observatory on September 14 1974 after three nights’ worth of photographic plates had been taken (September 11 through 13; Leda appears on all of them). It was named after Leda who was a lover of Zeus the Greek equivalent of Jupiter (who came to her in the form of a swan).
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