ROME - AUGUST Octavian 27 BC - 14 AD) CAESAR AVGVSVS. Head of Augustus on the right, wearing the oak crown. R/ DIVVS IVLIVS in the centre of a comet "Sidus lulium" known as Caesar's Comet. BMC 59. RIC 37a . Giard 1299. Silver denarius struck in Spain (Colonia Patricia) around 18 B.C. (3,26 g) Dark patina. Very nice. Caesar's Comet, or the Great Comet of 43-44 BC, is perhaps the best-known comet of antiquity. Its seven-day visibility was taken by the Romans as a sign of the deification of Julius Caesar, who died shortly before it appeared. Caesar's comet is one of the five comets known to have a negative absolute magnitude and was probably the brightest historical comet during the day. It was a non-periodic comet and may have disintegrated.