Catalogue and alternative designations NGC 5139, Omega Centauri   Type Globular cluster  Position  13 26.8, -47 29 Constellation Centaurus Camera and Telescope STL11000M and 31.75 cm Ritchey Chretien Focal Ratio F9 Exposure Details LRGB 30:60:60:60 All 1x1 Description Omega Centauri is the largest and brightest globular cluster in the night sky and is visible to the naked eye as a hazy spot even in moderately light polluted locations.  The distance is about 18,300 light years and the visual magnitude is 3.7.