Britannica Sources used in this answer

How bright did Tycho’s Nova become in 1572?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Supernova Composite image of Kepler's Nova, or Kepler's Supernova, taken by the Chandra X-ray Observatory.

Tycho’s Nova, a supernova observed in 1572, reached an apparent magnitude of approximately −4, making it as bright as the planet Venus. It was so luminous that it remained visible to the unaided eye during the day.12