The sight of NGC 6621 was a huge surprise. I wouldn't have thought that the faint tidal tail is visible of this interacting / merging pair of galaxies also catalogued as Arp 81. After viewing the galaxies for a while I called Ivan to take a look. Without any information. He didn't even know what he was taking a look at, except that they are galaxies. After about a minute he asked something like "what is it below these?".

At first sight the two elongated spots of the galaxies can be seen perpendicular to each other with a tiny stellar core in each galaxy. The the details come gradually: the elogated core region of NGC 6621 (to the left, the bigger one), a fragment of a spiral arm towards top left, the completely irregular shape of NGC 6622 (to the right, the smaller one) with a tiny spot in it. The latter one is very uncertain, I put three question marks next to it in my observing spreadsheet. And the tidal tail is visible as well. Its easiest part is below NGC 6621.

Comparison with the photograph

The Hubble image of NGC 6621-22 can be seen to the left with my 16" drawing next to it. I rotated and cropped my drawing so that the two cover about the same field.