Psamathe

Psamathe — moon orbiting Neptune, explore its interactive 3D model in Cosmoscope.

Explore Psamathe in a live 3D Solar System. Follow its calculated motion and inspect real astronomical data, distances and orbital facts.

One of the most distant moons of any planet, Psamathe takes about 25 years to circle Neptune — backwards, around 48 million km out. It is probably a piece of the same shattered moon as Neso and S/2021 N1.

Radius

~14.5 km

Orbit

47.6 million km from Neptune

Period

25.0 years — retrograde

Discovered

2003 — Sheppard, Jewitt and Kleyna, Subaru telescope

Orbit shape

Backwards, tilted and loose; the Sun’s pull keeps changing it

Family

Neso group, with Neso and S/2021 N1

Size

About 29 km across, estimated from its brightness

Explore Psamathe in 3D

Cosmoscope places Psamathe in the Solar System using astronomical ephemeris or orbital elements, updated for the simulation time. Explore its calculated motion, distance and orbital facts in the interactive 3D view. Accuracy depends on the orbital model and its valid time range.