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The galaxy NGC 7793 | by Nicolas ROLLAND
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The galaxy NGC 7793

NGC 7793 is a flocculent spiral galaxy about 12.7 million light-years away in the constellation Sculptor, discovered in 1826 by James Dunlop.

It is one of the brightest galaxies within the Sculptor Group of galaxies.



On March 25, 2008, the Supernova SN 2008bk was discovered in NGC 7793. At apparent magnitude 12.5, it became the 2nd brightest supernova of 2008. The progenitor of this supernova was a Red Supergiant, observed only 547 days prior to the explosion.


Jets from a black hole named P13 power a large nebula named S26 in the outer spiral of this galaxy. The mass of P13 was determined to be less than 15 solar masses, and its companion star is estimated to be around 20 solar masses. The two orbit each other in 64 days. Based on this estimate, P13 is stripping material away from a nearby star about ten times faster than was previously believed to be physically possible.


RA: 23h 58m 53.62s

DEC: -32° 28' 33.3"

Location: Sculptor

Distance: 12 Mly

Magnitude: 9.15


Acquisition October 2020

Total acquisition time of 28 hours.


Technical Details

Data acquisition: Martin PUGH

Processing: Nicolas ROLLAND

Location: El Sauce Observatory, Rio Hurtado, Chile

L 21 x 1200 sec

R 15 x 1200 sec

G 15 x 1200 sec

B 15 x 1200 sec

Ha 12 x 1800 sec

Optics: Planewave 17“ CDK @ F6.8

Mount: Paramount ME


Pre Processing: CCDstack & Pixinsight

Post Processing: Photoshop CC

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Uploaded on January 5, 2021