Scott Kardel aka Palomar Skies: Last night I observed near-Earth asteroid 2011 UL21. The line in this image shows its motion against the starry background during this 20-minute exposure. At the time it was was just 12.3 million miles from Earth (and getting farther away). 🔭

Last night I observed near-Earth asteroid 2011 UL21. The line in this image shows its motion against the starry background during this 20-minute exposure. At the time it was was just 12.3 million miles from Earth (and getting farther away). 🔭

Nice!

That’s amazing!

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