Note: this is only an initial short take of Arp104. The full version of this image is
here.
Quick view of this connected couple of galaxies, taken the night of 3rd May 2023. With more exposure the bridge joining the two galaxies might had become more evident. The weather forecast is only clouds for the next two weeks, therefore I closed the project quick and dirty.
Arp 104Also 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.
Other large background galaxies are: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
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