Your picture shows the outer ring that was to big to fit into the field of my scope. It is faint in the your picture, but it was very bright in the image intensifier. Had I been using the 6" f/2.8 I could have gotten it in the field I think.
There were several. I was enjoying Saturn, then wanted to step down so I was going to fetch another eyepiece. I just happened to look up and I saw one cloud, bright blue, and twice the size of the Moon in Lacerta. That's odd, I thought. It didn't change shape or move at all over a few seconds. So I pointed a 31 Nagler at it with my 15". Not knowing what I was looking at, I figured I would ask, so I tried taking a picture. My phone apparently remembers the settings so I captured at my NV astrophonography settings of 4s at ISO 800. I'm surprised I got anything at all. And, the scope wasn't even tracking, hence the different trails. By the time I realized I was getting garbage, the outer rings had faded. It looked like a little barred spiral floating along. I pointed a 13 Ethos at it and could see the pointof light in the middle becomming two distinct points at times. Definitely wasn't expecting that, though I will be on the lookout for more. Exciting stuff!