Help, what is this?

Hi all,
While imaging around NGC 3718 and Hickson 56 I picked-up something I cannot identify. Below is a single 5 minute sub exposure with the item in question marked. It is present on all the subs. Is this some sort of lens flare? Image is from a FLI 1024, Tak Mewlon 300, clear filter captured remotely.

Thanks
John

Attached Image:

well Megastar doesnt show anything but that doesnt mean its not there.. The shape however suggests its an artifact, but who knows, cant be sure unless you take another image I think, maybe a bit offset from your center on this one. The Hickson stuff looks great BTW, very nice deep image even in raw presentation.

Sure looks like a lens flare. The fact it points directly
away from the field center is consistent with this. Probably
bright star somewhere outside the field in that direction.