http://arxiv.org/abs/1912.12539
The semi-regular variable star Betelgeuse is undergoing an historical minimum of its brightness. An 8 year series of visual and V-band CCD observations started at the end of 2011 is presented and discussed. Visual methods for comparing magnitudes of angularly distant stars, and performing a differential photometry, needed for such a bright star, are also presented.
C. Sigismondi
Wed, 1 Jan 20
75/88
Comments: 4 page, 2 figures, 1 table
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