Arp 84 is in the same Arp grouping as Arp 83 and it appears similar (Arp 84 is much larger and brighter than Arp 83).  Both galaxies were discovered by William Herschel on 16 May 1787 (sweep 738).  Spiral structure was noted at Birr Castle.

My notes on this really nice object: These stand out really well from the first 30 second frame.  NGC5394 is a nearly face on two armed spiral that is NW (above) NGC5395 in my capture.  Arp 84 is the pair of galaxies.

NGC5395 is clearly a two armed spiral as well, but it is at an angle to our line of sight and appears elongated (3:1).  The upper arm (N) is rather stubby while the lower arm (S) makes a very sharp dog-leg back up towards NGC5394.  This dog-leg is very slightly curved but the general impression is a straight line.  The galaxy has a bright core that is very slightly out of alignment with the arms, and there is just a small halo around it.  The lower arm seems to attach to the halo on the top of the nucleus and is tight against it as it loops around.  When it gets 180° around it does the dog-leg.  The second arm appears to start at the same point, but it does not appear to be joined.  It does show some curving around but does not have a well defined shape.  There also is significant dark material between the lower arm and the nucleus on the right side (W) of the galaxy.  The extreme tip of this arm makes a little hook where it appears to cross over the lower arm of NGC5394 (or this could be just the lower arm continuing with its spiral arc).  It does appear there is interaction at this point though.

NGC5394 is much better defined as a spiral.  It has a rather distorted nuclear region and appears elongated about (2:1).  I see a stellar core almost in the center and the nucleus is larger and brighter to the left side (E).  The two main arms seem to originate on the left and right sides of this nucleus.  The upper arm is a little more diffused and ends just beyond a faint field star.  It points directly at a nearby, faint and narrow galaxy just a little away (PGC 2101092 @ 17.80m).  The lower arm is a little brighter and remains more uniform in brightness than the upper.  It appears to end in the lower arm of NGC5395.WD sharpens the galaxy details somewhat, but the view is nicer without it (at least at 32 minutes).  I have BF set to 2.03, 0.16.  Setting Lum. Tol. lower like this still reduces noise but lets more details through.  A 75% zoom seems to show details well with this setup.  I'm sure a longer soak would improve the view, but this pair is so bright it really does not need more than about 35 minutes.  I wish all the small Arp's looked like this one.

IC 4356 and PGC 2102129 are nearby and just above NGC5394.  An interesting asterism is just below and to the right (N) of NGC5395.  It consists of 2 very similar brightness stars with an arrow shaped collection of four fainter stars between and below them.  It somehow reminds me of an ant or other insect with big, buggy eyes.