NGC 5559 is a barred spiral galaxy, located 240 million light-years away in the constellation of Boötes. It was discovered on April 10, 1785, by the astronomer William Herschel.

In 2001, a type Ib supernova was detected within NGC 5559, and was subsequently designated SN 2001co.Transient Name Server entry for SN 2001co. Retrieved 16 July 2024. However, in 2003, the supernova was identified as a calcium-rich supernova, as it had strong spectral lines characteristic of calcium. The progenitors of these calcium-rich supernovae are still a mystery.

See also Spiral galaxy

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