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Watching asteroids fly by

It was 23°F inside the observatory while we were observing the asteroid

Asteroid 2005 YU55 sketched November 8, 2011

Asteroid 2005 YU55 wasn’t my first visual observation of an asteroid passing near Earth, but preparing to view it brought back some great memories of our first one, asteroid 2002 NY40, nearly ten years ago.

Here’s a [...]