Celestial hemisphere:  Southern  ·  Constellation: Tucana (Tuc)  ·  Contains:  47 Tuc Cluster  ·  NGC 104  ·  NGC 121
47 Tucanae, Ralph Wilhelm
47 Tucanae
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47 Tucanae, Ralph Wilhelm
47 Tucanae
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Description

47 Tucanae or 47 Tuc (also designated as NGC 104 and Caldwell 106) is a globular cluster located in the constellationTucana. It is about 4.45 ± 0.01 kpc (15,000 ± 33 ly) from Earth,[9][4] and 120 light years in diameter.[10] 47 Tuc can be seen with the naked eye, with an apparent magnitude of 4.1.[3] It appears about 44 arcminutes across including its far outreaches. Due to its far southern location, 18° from the south celestial pole, it was not catalogued by European astronomers until the 1750s, when the cluster was first identified by Nicolas-Louis de Lacaille from South Africa.47 Tucanae is the second brightest globular cluster after Omega Centauri, and telescopically reveals about ten thousand stars, many appearing within a small dense central core. The cluster may contain an intermediate-mass black hole.[11][12]

(Source: wikipedia.org)

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47 Tucanae, Ralph Wilhelm