Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2023 November 4
See Explanation.  Clicking on the picture will download the highest resolution version available.

Dinkinesh Moonrise
Image Credit: NASA/Goddard, SwRI, Johns Hopkins APL, NOIRLab

Explanation: Last Wednesday the voyaging Lucy spacecraft encountered its first asteroid, 152830 Dinkinesh, and discovered the inner-main belt asteroid has a moon. From a distance of just over 400 kilometres, Lucy's Long-Range Reconnaissance Imager captured this close-up of the binary system during a flyby at 4.5 kilometre per second or around 10,000 miles per hour. A marvelous world, Dinkinesh itself is small, less than 800 metres (about 0.5 miles) across at its widest. Its satellite is seen from the spacecraft's perspective to emerge from behind the primary asteroid. The asteroid moon is estimated to be only about 220 metres wide.

Tomorrow's picture: aurora borealis


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