Caesar's Comet

Caesar's Comet (C/-43 K1) is also known as 'Comet Caesar' and the 'Great Comet of 44 BC'. It was one of the most famous comets of ancient times. Many Romans thought the comet's seven-day appearance was a sign of the deification of recently assassinated dictator, Julius Caesar (100–44 BC).
Caesar's Comet was one of only five comets known to have had a negative absolute magnitude and may have been the brightest daylight comet in history. It was not periodic, and it had a parabolic orbit. The comet might now be more than 800 AU from the Sun.