The biggest globular star cluster was treated like a star by the ancients, and it has the name "Omega Centauri." A telescope was required to identify its true nature.
Omega Centauri is located at a declination of -47 degrees, which means it is not visible for observers north of latitude ~36 degrees. My observatory is at a latitude of 31.4, and it reaches an elevation of 11 degrees above the horizon when it transits in the middle of the night in springtime.
Here's a color image made with a CCD and color filters.
Figure 1. Omega Centauri fills this field of view that measures 42.2 x 28.3 'arc. Northeast is upper-left. The white stars are saturated, which masks their true color. [Meade 10-inch LX200 SCT f/6.3, focal reducer lens f/4.7, True Tech color filter wheel, SBIG ST-8XE CCD; LRGB exposure totals of 2, 1.5, 1.5 and 8 minutes, unguided 30-sec individual exposures, MaxIm DL's digital development (FFT/medium), 2003.03.05/06, Hereford, AZ residence].
This globular cluster is estimated to contain 10 million stars, and is located 18,000 light years away.
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This site opened: March 6, 2003. Last Update: March 6, 2003