R Crb in a fade

[Malpi12]

A brief look out about midnight local (BST) revealed (between drifting clouds) Corona Borealis was missing R Crb !
A hasty grab of the camera on a tripod gave me 5 usable frames, out of 20, to stack and a quick&dirty comparison with some nearby stars in Stellarium gave me :-
297 7.58 HIP77373
257 8.08 HIP77743
234 8.33 HIP78001
184         R Crb
157 9.43 HIP77479
the first column is pixelpeeking in Gimp from the DSS stack
so I guessed about mag9 for R Crb