SkyTools works primarily on multiple star systems, not individual pairs.

[pmochocki]

SkyTools 3 asks for longitudes measured to the west, which means that they are positive in the western hemisphere and negative in Europe. So it is a negative number.

Thank you for the explanation - I got it now.

There are two ways to look at double star catalog errors. You can get upset that the data isn't perfect and tell me I should fix it, or you can see it as an opportunity to do some exploring on your own to find out what is really there. I myself find the second approach to be much more interesting, so I would love to hear from someone who has observed this system to know what stars are really there.

I will try to provide you some input, but unfortunately my scopes have small aperture. But during autumn time frame 31 Cyg will be high in the sky so maybe i will be able to make a nice sketch.
In October I will try to book the scope that is available in Gdansk (http://obserwatorium.gfo.pl/o-nas/wyposazenie/), maybe despite light pollution I will be able to see more.