Astronomers Identify Companion Star Orbiting Betelgeuse

A team using the European Southern Observatory’s Very Large Telescope in Chile reports that the red supergiant Betelgeuse, long thought to be solitary, has a nearby stellar partner. The companion is estimated to be about three times the mass of the Sun and roughly 1.8 times its size, according to the study’s lead author, Miguel Montarges.

The discovery was made by directly imaging the faint object next to Betelgeuse, whose own brightness—about 100,000 times that of the Sun—has previously obscured any nearby sources. The newly identified star shines with a luminosity close to 92 times solar, making it difficult to detect against the glare of its giant neighbor.

Betelgeuse, located over 500 light‑years away in the constellation Orion, has been observed for centuries and appears in ancient artwork. This binary nature, however, had not been confirmed until now. Researchers say the finding revises the star’s fundamental characteristics but does not alter expectations about its eventual supernova, which remains a topic of ongoing study.

While the VLT data provide the first direct image of the companion, further observations will be needed to refine its orbital parameters and assess any influence on Betelgeuse’s recent dimming events. The result underscores how even well‑studied celestial objects can still hold surprises.