Even though Betelgeuse has been hidden from Earthly view this summer, the STEREO A telescope 69 degrees behind (?) on its orbit has managed to gather V-band magnitudes that have got dimmer again.
The Astronomer's Telegram #13901 has the story...
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V magnitudes are reported for 3 STEREO-A rolls: 2020 June 24.12 UT, V= 0.66 +/-0.015; 2020 July 13.87 UT, V=0.76 +/-0.015; 2020 July 20.54 UT, V=0.80+/-0.015. Here the V-magnitudes are means and errors are the standard deviation of the individual measurements that include transformation uncertainties. Surprisingly, instead of continuing to increase or level off in brightness, Betelgeuse has decreased by ~0.5 mag from mid-May to mid-July. Spanning the STEREO observations, the star dimmed at a rate of 5 mmag/day. The decrease in brightness over 26 days between our first and third observation is comparable to the photometric behavior in late October 2018, and slower than the faster decline, between October 22 and November 10 2019, that marked the beginning of the historic Great Fainting event in February 2020. The next 'minimum' according to the 420-430 d periodicity is predicted to occur in early April 2021. If this current decline continues, another dimming event may occur much earlier. However, Betelgeuse has (not-well understood) complex light variations and it is difficult to make predictions. It will be important to continue to follow Betelgeuse closely through 2020/21.
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I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops. - Stephen J. Gould