Psamathe (moon)
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Psamathe or Neptune X, is a non-spherical moon of Neptune.
Psamathe was found by Scott S. Sheppard and David C. Jewitt in 2003. It orbits Neptune at a distance of about 46,695,000 km and takes almost 25 Earth years to make one orbit. It is about 24 kilometers in diameter.
It is named after Psamathe, one of the Nereids. Before the announcement of its name on February 3, 2007 (IAUC 8802), it was known by the designation S/2003 N 1.
- Eccentricity: 0.4499
- Orbital inclination: 146.60° (to Neptune's equator), 124.39° (to the ecliptic)
Given the similarity of the orbit's parameters with Neso (S/2002 N 4), it was suggested that both non-spherical moons could have been a bigger moon that broken up.
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| Moons | Naiad · Thalassa · Despina · Galatea · Larissa · Proteus · Triton · Nereid · Halimede · Sao · Laomedeia · Psamathe · Neso |  |
| Characteristics | Rings of Neptune · Great Dark Spot | |
| Discovery | John Couch Adams · Johann Gottfried Galle · William Lassell · Urbain Le Verrier | |
| Exploration | Voyager program · Voyager 2 | |
| Neptune Trojans | 2001 QR322 · 2004 UP10 · 2005 TN53 · 2005 TO74 · 2006 RJ103 · 2007 RW10 | |
