In the center of the image is NGC 4618 (Arp 23) in whose one spiral arm are IC 3668 and IC 3669 (0.02' large cluster of stars with emission nebula - not seen here).
In the center of the image is Arp 33 (UGC 8613 / PGC 48118). In the Arp catalog it is classified as a spiral galaxy. According to current knowledge, it is an interacting pair of galaxies with galaxy VV 6b, which is adjacent in the upper right. (http://Simbad.u-strasbg.fr/SIMBAD/sim-id?Ident=%402165745&Name=VV%20%20%20%206b&submit=submit). The galaxy pair belongs to the Arp 326 galaxy group.
Together with irregular galaxy IC 4526 (above right), NGC 5829 (large galaxy) forms the galaxy pair Arp 42.
Together with galaxies PGC 53702 (right above), PGC 53703 (diagonally right above), and PGC 53720 (diagonally left above), the five galaxies form HCG 73.
On the left is Arp 272 (consisting of NGC 6050 (left) and IC 1179 (right)).
Here there is a discrepancy in the Arp catalog. On the photo plate the galaxies NGC 6050 and IC 1179 are shown but in his table he puts NGC 6054 as target.
The online catalogs SIMBAD and Vizier have taken the table value, Wikipedia the galaxy pair.
At the left edge NGC 6054 can be seen.
On the right is the galaxy NGC 6045, which together with PGC 84720 (NGC 6045B - on the left edge of the galaxy) forms Arp 71.
All three are part of the Hercules Cluster Abell 2151.
The large galaxy is NGC 7603, the small galaxy at the left spiral arm is NGC 7603B (PGC 71041).
It is not entirely clear whether the two galaxies interact.
According to the data of the NED database the two galaxies are located at different distances from Earth (NGC 7603 about 400 Mio. Ly. (121 Mpc), NGC 7603 about 780 million yr. (240 Mpc)
http://ned.ipac.caltech.edu/byname?objname=NGC+7603&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1
http://ned.ipac.caltech.edu/byname?objname=NGC+7603B&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1
Arp 102 consists of galaxies PGC 60067 (below), PGC 60070 (the large galaxy above), and PGC 60073 (the bright region just inside the spiral arm below the upper galaxy).
At the very top is NGC 5218, which is connected to the galaxy below, NGC 5216, by a faint bridge. Together they form the galaxy pair Arp 104 (Keenan's System).
Abell 1185 consists of 82 galaxies including:
Arp 105 (NGC 3561 (the lower galaxy image center) and NGC 3561A (also PGC 33992 above)) (The Guitar).
NGC 3550
NGC 3552, NGC 3553, NGC 3554
NGC 3558
Arp 113, NGC 67, NGC 67A, NGC 68, NGC 69, NGC 70, NGC 71, NGC 72, NGC 72A
Apparent magnitude:
13,5 mag
Distance:
304.100.000 ly
Expansion:
442.000 ly
Image information
Field of view width:
24,116'
Field of view height:
16,595'
Image scaling:
0,475''/pixel
Apparent object width:
5'
Apparent object height:
3,5'
Notes:
The three galaxies in the center of the image are NGC 70 (right), NGC 71 (top) and NGC 68 (left). NGC 68 is thought not to belong to this group because it is 40 million kilometers closer to Earth.
In the lower left, next to NGC 68, is NGC 67 and again to its left NGC 67A (the two small galaxies).
At the top left of NGC 71 is NGC 69 (small galaxy) and the large galaxy above the three galaxies is NGC 72 above which is still very small NGC 72A.
The small galaxy directly above NGC 72A is PGC 1887599.
Diagonally to the right above the cluster of galaxies is NGC 74, but it is not part of Arp 113.
It is not entirely clear whether these two galaxies are interacting with each other
According to the measurements in the current databases for NGC 2672 - right galaxy (http://ned.ipac.caltech.edu/byname?objname=NGC+2672&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1) and NGC 2673 - left galaxy (http://ned.ipac.caltech.edu/byname?objname=NGC+2673&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1), the two galaxies are at different distances from Earth, although measurement errors must also be considered here.
However, it may also be that the two galaxies rotate around each other at a large distance, and the difference in redshift is caused by the Doppler effect.
Arp 170 is in the center of the image and consists of the two galaxies NGC 7578A (lower right) and NGC 7578B above left.
Arp 170 is part of HCG 94, a galaxy group consisting of seven galaxies and continues above Arp 170 with galaxies NGC 7578C, (just to the left of Arp 170), PGC 70937 (above NGC 7578C), PGC 70943 (the large galaxy to its left), PGC 70939 (to the right of PGC 70943), and PGC 70941 (above PGC 70943).
The galaxy group consists of the three galaxies IC 3481 (upper right), IC 3481A (diagonally lower left next to it) and IC 3483 (lower left below the bright star).
The right tail IC 4173, interacting with NGC 4933.
Just to the left, the blue dot, is PGC 45143 (NGC 4933C), but it probably does not interact with the pair of galaxies. (https://de.wikipedia.org/wiki/NGC_4933)
Since the galaxy has two widely extending arms, it is thought that it is probably the result of the merger of two galaxies. (https://de.wikipedia.org/wiki/Arp_180)
The large galaxy on the right is NGC 7674, which forms the Arp 182 galaxy pair with the galaxy NGC 7674A, which is directly oblique to the upper left.
Together with the small galaxy PGC 71507 (diagonally below on the left) and the galaxy NGC 7675 (on the left), the galaxy form the galaxy group HCG 96.
It is two merging galaxies (NGC 6052-1/2). In the infrared, the object reaches a luminosity of 11^11 times that of the Sun.
(https://de.wikipedia.org/wiki/NGC_6052)
Immediately to its left is PGC 6653 and at the top of the image is PGC 6654.
In the upper right corner is PGC 6634.
Right beside IC 162 is IC 161.
The SIMBAD and Skymap coordinates are not set up correctly for Arp 228. They point to the object IC 161 to the right of it. Vizier has the correct coordinates deposited.
The galaxy on the upper right is NGC 2992, at the end of which is the dwarf galaxy Arp 245N, formed by tidal forces.
(http://herschel.esac.esa.int/TheUniverseExploredByHerschel/posters/B18_LisenfeldU_Arp245.pdf)
Still visible on the photo plates in the Arp catalog is the oblique spiral galaxy PGC 90942 (FGC 938 - FGC=Flat Galaxy Catalog) at lower right. According to Wikipedia it should belong to the group, but probably it does not interact with the other galaxies. (https://images.mantrapskies.com/catalog/ARP-GALAXIES/ARP245-NGC2992-NGC2993/index.htm)
Arp 259, NGC 1741 (PGC 16573, 2MASXI J0501387-041533), PGC 16570
Apparent magnitude:
14,5 mag
Distance:
176.000.000 ly
Expansion:
92.200 ly
Image information
Field of view width:
7,2'
Field of view height:
5,4'
Image scaling:
0,18''/pixel
Apparent object width:
1,8'
Apparent object height:
0,5'
Notes:
Arp 259 consists of three galaxies.
The first two galaxies form NGC 1741 shown (left part of the large cluster). Here the upper part (bright blue area) is PGC 16573, the lower horizontal part is 2MASXI J0501387-041533.
The third galaxy is the right part and is called PGC 16570 (NGC 1741B).
Arp 259 belongs to HCG 31.
According to the original papers of Hickson PGC 16571 (small galaxy above PGC 16570) belongs to HCG 31.
In Wikipedia and SIMBAD HCG 31E (just below NGC 1741, the small blue dot), HCG 31F (small blue galaxy right below the star) and IC 399 (galaxy diagonally left below) are also included.
Left is Arp 272 (consisting of NGC 6050 (left) and IC 1179 (right)).
There is a discrepancy in the Arp catalog here. On the photo plate the galaxies NGC 6050 and IC 1179 are shown but in his table he puts NGC 6054 as a target.
The online catalogs SIMBAD and Vizier have taken the table value, Wikipedia the galaxy pair.
At the left edge NGC 6054 can be seen.
On the right is the galaxy NGC 6045, which together with PGC 84720 (NGC 6045B - on the left edge of the galaxy) forms Arp 71.
All three are part of the Hercules cluster Abell 2151.