Alnitak

Credits: Keith Turnecliff, Long Itchington

Alnitak is a triple star system at the eastern end of Orion's Belt, the second-magnitude primary having a 4th-magnitude companion nearly 3 arcseconds distant, in an orbit taking over 1,500 years. The part called Alnitak A is itself a close binary, comprising the stars Alnitak Aa and Alnitak Ab.

Facts about Alnitak by Keith Turnecliff

Alnitak Aa is estimated to be up to 28 times as massive as the Sun and have a diameter 20 times greater.
It is the brightest star of class O in the night sky.

This star chart represents a view from Long Itchington for mid-January at 10pm.
Credits: Image courtesy of Starry Night Pro Plus 8, researched and implemented by Keith Turnecliff.