Navigation Image from Touchdown 1 Rehearsal 1 [TD1-R1]
Navigation image (ground receiving time: UTC 2018-09-12 03:58) taken when the distance to Ryugu's surface was ~635m. The image top is Ryugu's south pole, the bright side on the left is due to the opposition effect & within it is the black dot shadow of Hayabusa2.

Image credit: JAXA
Source: Hayabusa2 Project Site
Link: The spacecraft shadow and opposition effect (Hayabusa2 project)