Nice shot
Try for a 20-30 sec exposure and take about 5-10 for stacking
See what you get
Those red spots are what some have said....hot pixels.
You could also try lowering the ISO rating to 800...your piccie won't be so grainy.
What would also help you is to get a (relatively) cheap EQ mount, like an EQ3 Pro, which will be more than sufficient to heft a camera and lens. With a setup like that, if you polar align the mount reasonably well, you'll be able to take pics lasting minutes instead of seconds and they'll turn out much better