Details:
What I captured here is a lovely demonstration of how a point source interacts with the atmosphere when one deliberately moves the camera. Sirius is the perfect candidate for this because it is both extremely bright and effectively a geometric point. That combination makes every tiny change in atmospheric refraction visible as a color change of that point. Moving the camera creates such colored trails. With bright planets like Venus or Jupiter that does not happen, because they are not point sources. They are small discs (typically Venus: ~10–60 arcseconds, Jupiter: ~30–50 arcseconds) Atmospheric refraction affects different parts of the disc slightly differently. But those effects average out across the surface. The result is a stable, white-ish trail without color flickering
