|Image taken using VST , image field 51 'x 51'.|
equinox : J2000.0 , epoch : J2000.0
|Right ascension||13 h 26 m 45.9 s|
|declination||−47 ° 28 ′ 37 ″|
|Brightness (visual)||5.3 mag|
|Brightness (B-band)||6.1 mag|
|Angular expansion||55 ′|
|Redshift||(794 ± 17) · 10 −6|
|Radial velocity||(+238 ± 5) km / s|
(5.3 kpc )
|diameter||approx. 150 ly|
|Age||approx. 12 billion years|
|NGC 5139 • C 1323-472 • GCl 24 • ESO 270-SC11 • Dun 440 • GC 3531 •|
ω Centauri ( Omega Centauri, ω Cen for short , also known as NGC 5139) is a globular cluster in the constellation Centaur . It has an apparent diameter of 55 ′ and an apparent magnitude of 5.3 mag. This makes it the brightest globular cluster in the sky and visible as a small nebula with the naked eye. It also has the greatest absolute brightness , as it is by far the most massive globular star cluster in our Milky Way . Within the Local Group , it is only surpassed in size by Mayall II , a globular cluster of the Andromeda Galaxy. Omega Centauri contains around 10 million stars.
Although ω Centauri is not a star, it was given a Bayer designation . The object differs from other globular clusters in that it contains several star populations . The latest research carried out with the Hubble Space Telescope and the Gemini Observatory shows that ω Centauri is probably a dwarf galaxy that has since been robbed of its stars by the Milky Way . The peculiarity of this object will now be easier to explain since a black hole with 40,000 solar masses has been found in the center.
High-resolution image of the center using the Hubble space telescope
Infrared image from the Spitzer Space Telescope
- Hubble Space Telescope
- Spitzer space telescope
- Cosmic record holder - video on Spiegel-Online
- NGC5139 on astro-pics
- Floor van Leeuwen, Joanne D. Hughes, Giampaolo Piotto (Eds.): Omega Centauri, A Unique Window into Astrophysics . 2002, ISBN 1-58381-105-2 , bibcode : 2002ASPC..265 ..... V .