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Harel Boren | all galleries >> Galleries >> International Acknowledgements - APODs and Publications > NGC5128 Centaurus A
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June 2015 Harel Boren

NGC5128 Centaurus A

Southern Sky Gems Observatory, Tivoli AstroFram, Kalahari Desert, Namibia

Total Exposure Time: 15 hours Bin1:L 60 x 10 min.;Bin1:RGB 30x10 min.each
This image is 1900x1450 pixels

Officina Stellare RiDK 305 F7.9 OTA
SBIG STF8300M, AP GTO1200 mount, guided w/MaximDL
RA 13h 25m 31s, Dec -43 01' 08"
Pos Angle +90 14', FL 2413.8 mm, 0.46"/Pixel

Processed with PixInSight using IP4AP methodologies (

What's the closest active galaxy to planet Earth? And what's the fifth brightest in Earth's sky (though visible from low northern latitudes and the southern hemisphere)? That would be Centaurus A, only 11 million light-years distant. Spanning over 60,000 light-years, the peculiar elliptical galaxy is also known as NGC 5128. Forged in a collision of two otherwise normal galaxies, Centaurus A's fantastic jumble of young blue star clusters, pinkish star forming regions, and imposing dark dust lanes are seen here in remarkable detail. The colorful galaxy portrait was recorded under clear Namibian skies at the Southern Sky Gems Observatory at the Kalahari Desert. Near the galaxy's center, left over cosmic debris is steadily being consumed by a central black hole with a billion times the mass of the Sun. As in other active galaxies, that process likely generates the radio, X-ray, and gamma-ray energy radiated by Centaurus A.

Spanning 25′.7 20′.0 on Earth's sky, and at an apparent magnitude of 6.84, Centaurus A was discovered in 1826 by Scottish astronomer James Dunlop from his home in Parramatta, in New South Wales, Australia. The galaxy's active galactic nucleus has been extensively studied by professional astronomers, and contains a supermassive black hole with a mass equivalent to 55 million solar masses,which ejects a relativistic jet that is responsible for emissions in the X-ray and radio wavelengths. By taking radio observations of the jet separated by a decade, astronomers have determined that the inner parts of the jet are moving at about one half of the speed of light. X-rays are produced farther out as the jet collides with surrounding gases resulting in the creation of highly energetic particles. The radio jets of Centaurus A are over a million light years long.

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joseantonio16-Jan-2017 17:22
amazing capture.Well done
ikkaisei03-Jul-2015 01:02
I especially appreciate your treatment of the star colours. Not over processed, just like a good film frame. The galaxy is especially well done and interesting to study. Normally I avoid them as looking at a tiny smudge usually does not stimulate my enthusiasm, but this one is special.