On Sun, 23 Dec 2018 18:44:35 -0600, hleopold
wrote:

Fast moving indeed. As I mentioned earlier, few things move fast in the sky,
other than meteors which move very fast. But this was surprising to me even
knowing that it is fast. Thanks for that. How far from the Earth was it at
the time you took those shots?

At the imaging time of 17 Dec 2018 UT 10:00, the distance was 0.078
AU, 11.7 million km, 30.3 lunar distances. That was just about its
closest approach to Earth.