Tycho's supernova in Cassiopeia. Depiction of the constellation Cassiopeia, published by the Danish astronomer Tycho Brahe (1546-1601), showing the su
Tycho's supernova in Cassiopeia. Depiction of the constellation Cassiopeia, published by the Danish astronomer Tycho Brahe (1546-1601), showing the supernova that he had observed on 11 November 1572. The supernova (here labelled 'NOVA' at centre right) appeared in the constellation of Cassiopeia (here shown as its mythological namesake). A supernova is the explosive death of a massive star. This supernova became as bright as the planet Venus, and was visible in daylight for two weeks. It remained visible at night to the naked eye for around 16 months. This supernova was later named SN 1572. The celestial map shows 26 stars of this constellation, named in the legend in Latin at upper left. This page is from 'Tychonis Brahe Astronomiae Instauratae Progymnasmata' (1602), prepared for publication after Tycho Brahe's death by Johannes Kepler, who wrote the appendix.
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