The great globular of southern skies

NGC5139-dba6a41

Wellerson Lopes

São Paulo

– Equatorial Mount Orion Atlas EQ-G
– GSO Ritchey-Chretien Telescope 8″ F8
– Canon DSLR 500D modified with Astrodon filter
– Focal reducer Astro-Physics 67 CCDT
– Guided with ASI120MM ZWO using OAG
– Astronomik CLS clip filter

Omega Centauri (ω Cen), or NGC 5139, is a globular cluster in the constellation of Centaurus that was first identified as a non-stellar object by Edmond Halley in 1677. Located at a distance of 15.800 light-years, it is the largest globular cluster in the Milky Way at a diameter of roughly 150 light-years. It is estimated to contain approximately 10 million stars and a total mass equivalent to 4 million solar masses.[1]

Omega Centauri is so distinctive from the other galactic globular clusters that it is thought to have an alternate origin as the core remnant of a disrupted dwarf galaxy.[1]

It is an interesting object that shows a peculiar type of stars, the blue stragglers, a main-sequence star in an open or globular clusters that is more luminous and bluer than stars at the main-sequence turn-off point for the cluster.

Sources:
[1] en.wikipedia.org/wiki/Omega_Centauri

I registered this picture at April, 10th 2016 in Polo Astronomico de Amparo РAmparo РṢo Paulo РBrazil.

Technical data:
ISO 800, 2h20m of exposition (28 subs), darks (~100), flats (60) and bias (~200).

2016-04-10T00:00:00

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