It contains approximately 100 stars, the brightest of which are 7th magnitude.NGC 5460 is another naked-eye open cluster, 2,300 light-years from Earth, that has an overall magnitude of 6 and contains approximately 40 stars.It contains several million stars, most of which are yellow dwarf stars, but also possesses red giants and blue-white stars; the stars have an average age of 12 billion years.This has prompted suspicion that Omega Centauri was the core of a dwarf galaxy that had been absorbed by the Milky Way.It is the largest and brightest globular cluster in the Milky Way; at ten times the size of the next-largest cluster, Omega Centauri is classified as a Shapley class VIII cluster, which means that its center is loosely concentrated.It is also the only globular cluster to be designated with a Bayer letter; the globular cluster 47 Tucanae is the only one designated with a Flamsteed number.Proxima, the tertiary star, is a red dwarf of magnitude 11.0; it is almost 2 degrees away from the primary and secondary and has a period of approximately one million years.Also a flare star, Proxima has minutes-long outbursts where it brightens by over a magnitude.
The primary and secondary are both yellow-hued stars; the primary, is of magnitude -0.01 and the secondary is of magnitude 1.35.
Notable stars include Alpha Centauri, the nearest star system to the Solar System, its neighbour in the sky Beta Centauri, and V766 Centauri, one of the largest stars yet discovered.
The constellation also contains Omega Centauri, the brightest globular cluster as visible from Earth and one of the largest known.
Omega Centauri was determined to be nonstellar in 1677 by the English astronomer Edmond Halley, Centaurus is also home to open clusters.
NGC 3766 is an open cluster 6,300 light-years from Earth that is visible to the unaided eye.