Hi Bert - Nothing at all showing in that position in MAMA 1 SERC image accessed in Aladin (see overlay below). Funny thing is, I have sets of images of this area (at wider scale), for 11, 13, 16 April and there is little showing there at the sort of brightness you're showing.
But the sub for the 16th does seem to show something faint there, in the rough position as far as my sub-standard widefields allow, LOL! My shots aren't deep - taken to find bright objects mag 7-10.
Don't know how long you were imaging for - you'd expect an asteroid to move if subs were taken over an appreciable time.
Good luck!
Cheers -