Discovery: Hippocamp was discovered by the Hubble Space Telescope on February 1, 2013, during a survey to search for faint rings around Neptune.

Name: The moon was officially named Hippocamp in February 2019. In Greek mythology, Hippocamp was a sea creature that had the upper body of a horse and the lower body of a fish.

Size and Shape: Hippocamp is a small moon with an estimated diameter of about 34 kilometers (21 miles). It has a somewhat irregular shape.

Orbit: Hippocamp orbits Neptune at an average distance of approximately 105,300 kilometers (65,400 miles). It follows a prograde, or forward, orbit, which means it orbits in the same direction as Neptune's rotation.

Resonant Orbit: Hippocamp is in a 1:1 orbital resonance with another moon of Neptune called Proteus. This means that for every orbit Hippocamp completes, Proteus completes one orbit as well. This resonance helps to stabilize Hippocamp's orbit.

Origin: It is believed that Hippocamp is a fragment or a piece of a larger moon, likely Proteus, that was shattered by impacts from comets or other celestial bodies in the past. The debris from the impact formed a ring around Neptune, and Hippocamp may have formed from the accumulation of this material.

Surface Features: Due to its small size and the distance from which it has been observed, the surface features of Hippocamp are not well-resolved. Scientists speculate that it may have a cratered or pockmarked surface.

Composition: The exact composition of Hippocamp is unknown, but it is likely composed of a mixture of water ice and rocky material.