Case file · Cosmic event
The guest star of 1181
Japanese and Chinese astronomers recorded a new star in Cassiopeia in August 1181 that stayed visible for about six months.
1181 CE · 35.02, 135.76 · status: official
The account
The Japanese record, kept in the Meigetsuki and the Azuma Kagami, is one of only a handful of naked-eye supernova records. In 2021 astronomers linked it to the nebula Pa 30.