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Hoag's Galaxy, 


            Colin McGill
Hoag's Galaxy

Hoag's Galaxy

Technical card

Resolution: 2749x2199

Dates:May 22, 2015

Frames: 73x600"

Integration: 12.2 hours

Avg. Moon age: 4.42 days

Avg. Moon phase: 20.53% job: 646320

RA center: 229.310 degrees

DEC center: 21.584 degrees

Pixel scale: 0.584 arcsec/pixel

Orientation: 179.926 degrees

Field radius: 0.286 degrees

Locations: Astro Camp, Nerpio, Albacete, Spain


Egged on by Lorenzo, I took some images of this (actually, lots, about 30 hours worth but had to throw half away because of poor seeing).

An interesting object, but hard to image - I pushed the smoothing mask harder than normal to avoid smoothing out the little detail there is in the galaxy. If you zoom in, you can just make out that part of the ring is thicker than the other (top right), and there is a little internal structure.

When it was first discovered (1950), Hoag proposed that the ring around the galaxy was caused by gravitational lensing. If you have a multi-billion space telescope available to you, you can see that the internal structure is actually spiral arms forming a ring around the galaxy. There is also a much larger hydrogen structure surrounding the rings, but you can't see that here!



Colin McGill
License: None (All rights reserved)

Sky plot

Sky plot


Hoag's Galaxy, 


            Colin McGill