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Astro Bob Blog: Radar reveals a rugged comet Wirtanen / Asteroid 2016 AZ8 gets a moon

Enjoy this twofer from the Arecibo radio telescope: a closeup of winter's brightest comet and an asteroid orbited by a mini-moon. (Photo credit: NASA / NSF)

When the naked-eye comet 46/Wirtanen zipped just 7.2 million miles (11.2 million km) from Earth last month, lots of people were looking including a team of scientists led by Ellen Howell from the University of Arizona’s Lunar and Planetary Laboratory.