Alnitak (Zeta Orionis): a bright multiple star in Orion's Belt Alnitak Alnitak (Zeta Orionis) is a luminous multiple-star system in Orion's Belt. Its hot O-type primary and close companions illuminate nearby nebulae and serve as a laboratory for massi…
BI Cygni — a luminous red supergiant in Cygnus BI Cygni BI Cygni is a red supergiant star in the constellation Cygnus, notable for a radius exceeding 1,000 times that of the Sun and for its role as an example of late-stage massive stell…
