The Omega Centauri globular star cluster, NGC 5139, is the largest and brightest globular cluster in the Milky Way galaxy. It is located about 15,000 light-years away in the constellation Centaurus and contains about 10 million stars much older than the Sun into a volume some 150 light-years in diameter.

Surrounding this southern hemisphere deep sky target we can find several tiny galaxies and a patch of nebulosity, also known as IFN, that belongs to the outskirts of the Milky Way.

I captured this image during my last stay at Tivoli Astrofarm Observatory located in Namibia. I used my small 300mm focal length refractor to capture 1h of Luminance data and 1h 30′ of R, G, B data. Short 30″ L, R,G,B images have been captured to preserve the star colors (not saturated in its cores).

The full image shown above covers an area of 4º26′ x 2º56′ at a resolution of 2.59″/pixel.

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Image Details

L: 120 x 30″ (1h)

RGB: (60 x 30″) x each channel (1h 30′)

Calibrated with darks, flats. dark-flats.

Total exposure: 2h 30′

Moon at 1%

Sky darkness: 22,05 mag/arcsec2

Image resolution: 2.59”/pixel

FOV (full image): 4º26′ x 2º56′

Equipment

FRA300 + ASI2600MM + LRGB ZWO filters + ZWO EFW 7 pos + ZWO EAF

ZWO AM5 mount

ASI AIR Plus

Guiding with ASI120MM and ZWO Mini Guide Scope

Software

ASI Air, APP, PIX, PS.

Aleix Roig, March 2025.
Tivoli Astrofarm, Namibia.

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