Omega Centauri
NGC 5139
Properties
Position & Identifiers
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About Omega Centauri
Description
Omega Centauri (NGC 5139) is the largest and brightest globular cluster in the Milky Way, located about 15,800 light-years away in Centaurus. Spanning 36 arcminutes and containing roughly 10 million stars, it is visible to the naked eye at magnitude 3.9.
Observing Tips
One of the most spectacular objects in the sky. Visible to the naked eye as a fuzzy star. Binoculars show it as a large, bright, granular ball. Any telescope resolves it beautifully into a sea of stars. Best from southern latitudes in spring and summer — a must-see object.
History
Known since antiquity. Ptolemy cataloged it as a star in 150 AD. Edmond Halley recognized its non-stellar nature in 1677. It is now believed to be the stripped core of a dwarf galaxy that was absorbed by the Milky Way.
Fun Facts
Omega Centauri has multiple stellar populations with different ages and metallicities, unlike normal globular clusters. This is strong evidence that it is the nucleus of a dwarf galaxy consumed by the Milky Way. It may contain an intermediate-mass black hole of about 40,000 solar masses at its center.
Community Photos (1)
Credit: Chuck Ayoub. License: CC0. (Wikimedia Commons)
Skybred Mar 2, 2026