G'Day Simon,
That is a nice scope but quite challenging I think for dimmer objects. The few images of this I've looked at elsewhere tended to use Ha combined with RGB, and also quite lengthy integration times. It's very intriguing nonetheless and forces you to concentrate to look for more in the image. Could likely be a bird or maybe a Hawk jet carrying out a manoeuvre with red smoke trailing behind it.
Thanks for sharing,
Regards, Ray