I was trying a few experiments last night. Here's one of the successful ones, indicating dwarf planet Haumea and captured with the ZWO SeeStar S50. 64 minutes integration time under not-terribly-dark summer skies in rural New Jersey. Haumea is about magnitude 17.5 right now and is in the same SeeStar field as IC 4449.
Limiting magnitude for a solid detection in this field is about 18.0. I'm pretty sure with darker skies and a cooler night we could get down to around 19.0 with the tiny SeeStar.
Thanks for looking.