moonlet

Didymos is itself orbited by a 160-meter moonlet named Dimorphos.

The golf cart-size spacecraft will travel over 6 million miles and collide with an asteroid moonlet—a small asteroid that orbits another asteroid—named Dimorphos in fall 2022.

It has a secondary body, or moonlet, named Dimorphos that’s 525 feet wide.

Using an onboard camera and autonomous navigation software, the spacecraft will crash itself into the moonlet at a speed of almost 15,000 miles per hour.

Dimorphos is a moonlet asteroid that orbits a larger asteroid known as Didymos.

He was circling the black moonlet, at perhaps a thousand yards from its pitted surface.

He had just glimpsed the jagged moonlet rushing obliquely toward them from the left, bulking suddenly big and monstrous.

The Arrow, the Hound and the Lady circled the moonlet, swinging inward to the attack.