Potentially Hazardous Asteroid (138971) 2001 CB21 close encounter: image and video – 23 Feb. 2022
We spotted potentially hazardous asteroid (138971) 2001 CB21 again last night. Here we present our latest image and video. The image above comes from a single 120-second exposure, remotely taken with the “Elena” (PlaneWave 17″+Paramount...
