A couple days back, I posted an animation of asteroid 4078 Polakis crossing
a star field. Using 354 images from the past three nights, I measured its
brightness, which varies as it rotates due to its oval shape and surface
features. This same curve repeats every 4.8 hours, which is the length of a
day on this asteroid.
https://i.imgur.com/mtbqWyJ.png
Tom
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