UPDATE:
Whoops!
With reference to my "Pluto" image above, I hadn't zoomed in enough on the star field and when I did, the real Pluto popped out from behind the star Tycho 6892:511, which is mag 8.
I think the 15mm lens, 30 secs at ISO 1600 managed to record down to mag 10, so no Pluto for me.
The other brighter star in the circle is HIP 98575 at mag 6.
Clyde can rest easily now.
Cheers
Dennis