Arp104, the Keenan's System (Mau_Bard)

Arp104, the Keenan's System

I added a full night of data to my original quick take of this interesting couple of galaxies, in order to make their joining matter bridge more visible.
In this new version I am happy that the numerous wonderful clusters of tiny remote background galaxies are now more evident.
In the main version here some prominent galaxies have been put under a x3 magnification lens.

Arp 104
Also known as Keenan's system, the entry 104 in Halton Arp's Atlas of Peculiar Galaxies catalog includes the spiral galaxy NGC 5216 and the globular galaxy NGC 5218. The two galaxies, that are 42.1 Mpc (137 Mly) from earth, are joined by a bridge of galactic material spanning 22 000 light years.
In 1790 William Herschel discovered the galaxies, and in 1926 they were studied by Edwin Hubble. In 1935 Philip C. Keenan first published a paper about the bridge connecting the galaxies, which was rediscovered in 1958 at the Lick and Palomar observatories.

Larger neighbor galaxies under the magnification lens:
NGC 5205 is a spiral galaxy with active nucleus, distant 84 Mly, and with a diameter of about 75000 ly.
PGC 47189 is a spiral galaxy with a Hubble distance of 306 Mly, based on its redshift z=0.021920
PGC 47347 is an edge on galaxy, probably a spiral one, a Hubble distance of 131 Mly, based on its redshift z=0.00935

Original
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Title: Annotated

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H

Title: Wide Field

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Light Polluted skies
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Arp's Peculiar Galaxies
Broadband under Bortle 7/8/9
Austria Astrophotography
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Status	Advanced success
Started	...
Astrometry.net job	7691931
PixInsight job	MGLPPX17WHPQN5RDJWR81OD5L5GPO5NX
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h30m13s.865
RA (top/left)	13h33m54s.475
RA (top/right)	13h26m32s.808
RA (bottom/right)	13h26m40s.790
RA (bottom/left)	13h33m50s.996

Dec (center)	+62°42′26″.18
Dec (top/left)	+63°05′48″.62
Dec (top/right)	+63°05′23″.44
Dec (bottom/right)	+62°18′45″.62
Dec (bottom/left)	+62°19′00″.72

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