Radar images from the Arecibo Observatory have shown that the asteroid by the name of 2020 BX12 that passed Earth earlier this month was a binary asteroid. What this means is the big asteroid had a smaller asteroid orbiting around it.
source https://gadgets.ndtv.com/science/news/asteroid-2020-bx12-earth-potentially-hazardous-asteroid-moon-spotted-2179791
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