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Tucana(too-kahn -ă) (Toucan) A constellation in the southern hemisphere near Grus, the brightest stars being of 2nd and 3rd magnitude. The 3rd-magnitude double star Beta (β) has components that are also double. The area contains the Small Magellanic Cloud and the globular clusters 47 Tucanae (NGC 104), of 4th magnitude so easily visible, and NGC 362, just visible. Abbrev.: Tuc; genitive form: Tucanae; approx. position: RA 0h, dec –65°; area: 295 sq deg.
(or Toucan), a constellation of the southern hemisphere. Its brightest star has a visual stellar magnitude of 2.8. A satellite galactic system of the Galaxy—the Small Magellanic Cloud—and a very bright globular star cluster are located in Tucana. The constellation is not visible in the USSR. (SeeSTELLARSKY.)