When NASA crashed its DART spacecraft into the asteroid Dimorphos, the goal was to shorten the space rock's orbit around its parent asteroid. The mission succeeded - but Dimorphos' orbit has continued to shrink and it isn't clear why
A few good speculations in the article (tumbling from the impact or ejecta coming back and imparting more change). Plus the HERA mission is scheduled to do an observation in a year or so to give even more data to work with.
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