CDK20: FL 2280mm, F/4.5, 0.34 arcsec/pixel raw
Moon: 0%
One of my old images that never got published, which I just came across.
I had intended to add a lot more time, to hopefully capture more of the gravitational lens arcs, but never got to it.
The Dragon Arc is visible on the left side of the central galaxy cluster.
The dark orange color of the stars in the galaxy cluster shows the large red shift produced by such a large distance from Earth.
Abell 370 is a galaxy cluster located nearly 5 billion light-years away from the Earth (at redshift z = 0.375), in the constellation Cetus. Its core is made up of several hundred galaxies. It was catalogued by George Abell, and is the most distant of the clusters he catalogued.
In the 1980s astronomers of Toulouse Observatory discovered a gravitational lens in space between Earth and Abell 370 using the Canada-France-Hawaii Telescope. A curious arc had been observed earlier near the cluster, but the astronomers were able to recognize it as this phenomenon.
Gravitational lensing
Abell 370 appears to include several arcs of light, including the largest ever discovered with 30" long. It was originally referred to as the Giant Arc, but later renamed to the Dragon Arc. These arcs or deformations are mirages caused by gravitational lensing of distant galaxies by the massive galaxy cluster located between the observer and the magnified galaxies. This cluster shows an apparent magnitude of +22.
In 2002, astronomers used this lensing effect to discover a galaxy, HCM-6A, 12.8 billion light years away from Earth. At the time it was the furthest known galaxy.
In 2009, and HST study in the field of Abell 370 revealed in greater detail the 30" long arc with the appearance of a dragon, and hence rebranded as The Dragon by NASA scientists. Its head is composed of a spiral galaxy, with another image of the spiral composing the tail. Several other images form the body of the dragon, all overlapping. These galaxies all lie approximately 5 billion light years away.
(Wikipedia)
My Collections:
Abell Planetary Nebulae (Complete)GalaxiesMessier ObjectsPlanetary NebulaeSharpless 2 ObjectsGravitational Lens Galaxies 
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