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The semi-regular variable star Betelgeuse is undergoing an historical minimumof its brightness. An 8 year series of visual and V-band CCD observationsstarted at the end of 2011 is presented and discussed. Visual methods forcomparing magnitudes of angularly distant stars, and performing a differentialphotometry, needed for such a bright star, are also presented.

Betelgeuse at the end of 2019: an historical minimum about to end