Hubble Sees Newborn Stars in Arms of a Spiral Galaxy
NGC 5559 was discovered by astronomer William Herschel in 1785 and lies approximately 240 million light-years away in the northern constellation of Boötes (the herdsman)
In 2001, a calcium-rich supernova called 2001co was observed in NGC 5559. Calcium-rich supernovae are described as “fast-and-faint,” as they're less luminous than other types of supernovae and also evolve more rapidly, to reveal spectra dominated by strong calcium lines. 2001co occurred within the disk of NGC 5559 near star-forming regions, but calcium-rich supernovae are often observed at large distances from the nearest galaxy, raising curious questions about their progenitors.