SN 1604, also known as Kepler's Supernova, Kepler's Nova or Kepler's Star, was a supernova of Type Ia that occurred in the Milky Way, in the constellation Ophiuchus.

Remnant: Shell

Constellation: Ophiuchus

Peak apparent magnitude: −2.25 to −2.5

Galactic coordinates: G4.5+6.8

Spectral class: Ia

Other designations: 1ES 1727-21.4