This is an animation I put together of Asteroid Sechenov (MPC 5234) from frames I took of M31 over several nights in August / September 2021.  During processing, I was examining the frames closely with the Blink process in PixInsight for star shapes and sizes to cull out the poorest ones.  I happened to spot a slow moving object that appeared in all the frames, even over several nights of imaging.  I knew it had to be an asteroid, and the Minor Planet Center checker confirmed it was a well-known and relatively bright asteroid named Sechenov.  I wasn't able to find out much at all about its physical size and composition, however its orbit is well known, so there was no need for me to submit any of my observations.

Each frame is a 5 minute exposure with the luminance filter.  The time in between frames varies as I was rotating through the LRGB filters and also rotated between 300s and 30s exposures.  This animation is comprised only of the 300s luminance frames.  The actual span of time shown for each night is approximately 7 hours.  The images were taken with a QHY600M-PH on a Takahashi FSQ-106.  This image is heavily cropped.  M101 is approximately just off frame to the upper left, and the center of M31 is roughly off frame in the bottom left direction.

I had always wanted to stitch my own images into an animation if there was anything interesting changing in the field of view, so I tried my hand at it here.  I've never been able to produce an animation from the Blink tool in PI.  Rather, I used that process to produce cropped frames from the luminance channel images.  I then used Mathematica to load and edit and then save to a GIF animation.  I added circles to show the asteroid's position at the start of each night's sequence as well as the acquisition times in UTC.  As the asteroid moves across the field, the jumps, of course, correspond to daytime.  From my notes I see that one of the nights was too cloudy to image, hence the gap in the tracking.

I hope you enjoy this animation.  Now that I've found a way that I know how to manipulate images in Mathematica, I can envision doing my own annotations in the future, but only if I have the time!