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David, unfortunately we can’t pin down such stellar flare ups that precisely. The stars that do change their light with exact timings are not explosions like these novas o supernovas, but binary stars orbiting each other and eclipsing their companions at precise intervals. Like Algol, which loses half its light every 2 days, 20 hours, and 49 minutes. With this one, we really onlyknow the right year. Probably.

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