Note the difference in the length of the star trails.
This object is just less than
twice as far from earth on the 16th as on the 17th.
Both sets of images are 20, 30sec frames stacked, tracking
on the asteroid,
(a period of about 12 minutes)
This is the same data shown in the two images above, presented as a movie.
The image from Thursday night (above) is of the same time span
as this image from friday night (below).
The exposure time for each frame was 30 seconds.
The total duration is about 12 minutes.