In Celtic mythology and English folklore, a Puck is a mischievous sprite, imagined as an evil demon by Christians.

Little is known about Puck aside from its orbit,[4] radius of about 81 km,[5] and geometric albedo in visible light of approximately 0.11.

[1] Images showed that Puck has a shape of a slightly prolate spheroid (ratio between axes is 0.93–1).

It is probably made of a mixture of water ice, and may have been collisionally disrupted and reaccreted as a rubble pile.

[13] The presence of a 3.0 deep 3.0 micron feature attributed to the O-H stretching mode suggests that water ice or hydrated minerals are a common component on Puck's surface.

[14] The absence of craters with bright rays implies that Puck is not differentiated, meaning that ice and non-ice components have not separated from each other into a core and mantle.