Asteroid 6489 Golevka

The asteroid used to measure sunlight nudging a rock off course.

The actual model file, as it will be printed. Drag to turn it.

Golevka is only half a kilometre across, but radar tracking of it across twelve years produced the first direct measurement of the Yarkovsky effect: the tiny push an object gets from radiating absorbed sunlight, enough to shift an orbit over time.

Published by NASA in their 3D Resources collection, which they state is free of copyright. Printed to order — scaled to about 80 mm on its longest side, and resizeable on the next page.