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Betelgeuse is not alone

21 Aug 2026 Isabelle Dumé

Reading Time: 3 minutes

VLT images of Betelgeuse and its companion. The middle inset was taken in January 2019 with the SPHERE instrument at ESO’s VLT and shows Betelgeuse itself. The image in the left inset was taken in December 2024, when the companion was predicted to be farthest from Betelgeuse as seen from Earth. In this inset, Betelgeuse has been removed, revealing a source (marked with a crosshair) consistent with being Betelgeuse B. (Courtesy: ESO/M. Montargès et al. Background: N. Rissinger (skysurvey.org))

Astronomers have found the best evidence yet for a companion star to Betelgeuse, the brightest star in the constellation Orion. Based on data obtained by the SPHERE instrument on the European Southern Observatory’s Very Large Telescope (VLT) in Chile, they say this companion may be responsible for the red supergiant star’s periodic changes in brightness, which have puzzled scientists for decades.

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