Hello, John
A great image and excellent presentation, but I think that it may not be completely accurate?
I’ve just opened Starry Night Pro Plus 6 and Iapetus is measured at approx. 6 arcmin from Saturn with Titan and Hyperion at approx. 1 arcmin each, which doesn’t fit with your image, so I don’t think that #1 is Hyperion.
For #6, marked as Polydeuces, Helene would be a more suitable candidate as Polydeuces, (Saturn XXXIV) is estimated to be only 2–3 km in diameter and I could not find an on-line estimate of its Apparent Magnitude. I strongly suspect that even Helene at mag 18.69 is beyond the limits of the DMK51 and a better candidate for #6 might be the mag 12.59 star USNO J1430434-120044.
I Goggled Fenrir and its quoted Apparent Magnitude is 25, which is extremely faint and so the object marked #7 is not Fenrir. Just FYI, a few Ice in Space members have managed to image down to around mag 22 with larger ‘scopes, longer exposures and more exotic, cooled ccd cameras.
Anyhow, that’s just the result of a few minutes research, but great effort though, I must have a go at this myself on the next clear night in Brisbane, if we ever get another one this year…
Cheers
Dennis