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Testing the C11 to the limit in urban environment. Arp 104 / Keenan System.

Actualizado: 2 abr 2020

A complicated objective of photographing with 11" telescope aperture and in urban environment is the intergalactic bridge between the galaxies NGC 5216 and NGC 5218, formed after the collision of both galaxies, both already have magnitudes of 13.6 and 12.3 respectively, but capture the filament that joins them is a good challenge for this telescope, with 26 shots of 900s each with clear filter, tracking with Lodestar in OFF AXIS mode, mount EQ8 and capturing with camera ST8XME in urban environment (Majadahonda) the result is not a photo artistic, but you can clearly see the filament that interacts between both galaxies:

In the upper part, the spiral galaxy NGC 5216 and in the lower part the globular galaxy NGC 5218, both connected by a filament 22,000 light-years long.

Both galaxies were included with the name of Arp 104 in the Catalog of Peculiar Galaxies of Halton Arp. The set is also known as the Keenan System.

The set was originally discovered by Friedrich Wilhelm Herschel in 1790 and later studied by Edwin Hubble in 1926. But it was not until 1935 when Keenan noticed that this double galactic mystery seemed to be connected by "luminous debris"

The pair is 17.3 million light-years away from us.

As an additional test of the C11 tube in my observatory, here is captured a capture of part of the field of view of the same photo as the set Arp 104, in which the galaxy PGC 2639287 appears

It is a very weak spiral galaxy of magnitude 16.45 and apparent size 0.5 'x 0.3'.

The result of the photo of the set of the galaxies NGC 5216 and NGC 5218, after processing it with Photoshop is this:

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