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The recurrent nova T CrB had prior eruptions observed near December 1787 and October 1217 AD
The famous recurrent nova (RN) T Coronae Borealis (T CrB) has had observed eruptions peaking at a visual magnitude of 2.0 in the years 1866 and 1946, while a third eruption is now expected for the year 2024.4 ± 0.3. Each RN has very similar light curves of eruptions that …