Celestial hemisphere:  Southern  ·  Constellation: Tucana (Tuc)  ·  Contains:  47 Tuc  ·  NGC 104  ·  NGC 121  ·  NGC 152  ·  NGC 176  ·  NGC 249  ·  NGC 261  ·  tet Tuc
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47 Tucanae, Sigga
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47 Tucanae

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47 Tucanae, Sigga
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47 Tucanae

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Description

47 Tucanae, 47 Tuc (or NGC 104) is a globular cluster located in the constellation Tucana. It is about 4.0 ± 0.35 kpc (13,000 ± 1,100 ly) away from Earth, and 120 light years across. 47 Tuc can be seen with the naked eye, with the apparent magnitude of 4.1v, and whose apparent size subtends about 50′ or 0.9° across. Due to its far southern location just 18° from the south celestial pole, it was not discovered 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 (following Omega Centauri), and telescopically reveals about ten thousand stars, many appearing within a small dense central core. In February 2017, indirect evidence for a likely intermediate-mass black hole in 47 Tucanae was announced.

It was first given its Bayer designation ξ Tucanae by Johann Bayer in 1603 within the published Uranometria Omnium Asterismorum ("Uranometry of all the asterisms"), or now simply as "Uranometria" , but was discovered as a cluster by Nicolas-Louis de Lacaille in 1751-2, who initially thought it was the nucleus of a bright comet. It then become the first object listed in his deep-sky catalogue as 'Lac I-1'. Its designated number '47' was later assigned in "Allgemeine Beschreibung und Nachweisung der Gestirne nebst Verzeichniss" (General description and verification of the stars and indexes) compiled by Johann Elert Bode and was published in Berlin during 1801. Bode did not observe this cluster himself, but had reordered Lacaille's catalogued stars by constellation by order of Right Ascension.

--Wikipedia

Turned out ok, histogram a bit unusual which I not understand so I try some revisions.

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    47 Tucanae, Sigga
    Original
  • 47 Tucanae, Sigga
    B
  • 47 Tucanae, Sigga
    C

B

Description: Change contrast and gamma.

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C

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47 Tucanae, Sigga