The globular cluster 47 Tucanae (NGC 104)

Among the many spectacular objects in the southern skies are two magnificent naked-eye globular clusters, omega Centauri and 47 Tucanae. These ancient cities of stars are captives of the Milky Way but were formed long before our Galaxy assumed its present shape, indeed these clusters have some of the oldest known stars. 47 Tuc is about 15,000 light years distant and contains several million stars, as many as some minor galaxies. The crowded central region leads to occasional stellar encounters and it is in 47 Tuc that rapidly-spinning pulsars have recently been discovered by radio astronomers. Though the light of globular clusters is dominated by so-called 'red' giant stars, their colour is no redder than a domestic tungsten lamp, so the true colour of 47 Tuc is close to the pale yellow reproduced here.

Entry from NGC 2000.0 (R.W. Sinnott, Ed.) © Sky Publishing Corporation, 1988:

NGC  104  Gb 00 24.1  -72 05 s  Tuc  30.9   4.0  glob. cl.  !! vB, vL, vmCM