Rigel: The Blue Supergiant in Orion – Facts & Observation

By Alexander Merz · Updated on 2 August 2026 · Details checked on 14 September 2026

Rigel is the brightest star in the constellation Orion: a blue supergiant roughly 860 light-years away that shines about 120,000 times brighter than the Sun.

The Powerhouse of Orion

Rigel marks the left foot of Orion – and, despite its enormous distance of around 860 light-years, it is the seventh-brightest star in the sky. The blue supergiant shines about 120,000 times more brightly than the Sun; were it at Sirius’s position, it would cast shadows at night like the Moon. Its bluish-white colour reveals a surface temperature of over 11,000 degrees.

The Contrast with Betelgeuse

In the same constellation, diagonally opposite, twinkles the red shoulder star Betelgeuse – nowhere else in the sky can the colour contrast between a hot blue and a cool red giant star be enjoyed more beautifully with the naked eye. The same fate awaits them both: they will end as supernovae.

Observing Rigel

Easy to find from October to March: the bright bluish star at the lower right of Orion. Rigel is a multiple system – its companion Rigel B (7 mag) can be split in medium-sized telescopes from about 100 mm of aperture, but it sits close to the dazzling primary star: a fine challenge for calm nights.

Frequently Asked Questions

Why is Rigel so bright even though it is so far away?

It is a supergiant with around 120,000 times the Sun’s luminosity – its sheer energy makes up for the distance of 860 light-years.

What colour is Rigel?

Bluish-white – the hallmark of very hot stars with surface temperatures above 11,000 degrees.

Will Rigel explode?

Yes: as a massive supergiant, Rigel will end in the astronomically near future (within a few million years) as a supernova.

Where can I find Rigel?

In the winter constellation Orion: the bright star at the lower right, diagonally opposite the reddish Betelgeuse.