DSO classifications in Triatlas

[baggywrinkle]

I have copies of various charts from  Triatlas, however I have had real problems trying to find the Suffix cklassifications used, for exampe U as in U913 in Andromeda. This does not relate to the Upsala cataloguge which uses UGC. Any ideas folks? Some also have no suffix letter.

Edited March 20, 2021 by baggywrinkle

[Waddensky]

Just compared a few galaxies in my intermediate B-C TriAtlas with SkySafari, but as far as I can see the U is the prefix for the UGC catalogue. I can't find labels with UGC on the TriAtlas charts.