Kepler's Star (SN Oph 1604)
Kepler's Supernova Remnant. Image: Hubble Space Telescope.
Kepler's Star (SN Oph 1604) is a Type Ia supernova whose light reached Earth in 1604. The resulting "new" star, which reached a visual magnitude of about -2.2 in late October, was described by Johannes Kepler in his De Stella Nova (1606). The visible supernova remnant consists of a few faint filaments and knots in the galactic halo at a distance of 30,000 to 40,000 light-years, and 4,000 to 5,000 light-years above the galactic plane. Also known as Kepler's Supernova.