Space Time
The outermost known moon of Pluto, a bright irregular body moving around the shared Pluto–Charon center of mass.
One record per aspect. The origin says what kind of thing each value is; the source says where it came from; the limit says what it cannot tell you.
Hydra is placed by solving a Keplerian orbit around pluto at the simulation time (a = 65,200 km, e = 0.009, i = 0.3°, period 38.2 d).
Hydra: mean radius 18.5 km. These values are bundled with the object record and drive the rendered size.
The short description and the fact list are written by the Space Time authors for orientation. They are not quoted from a catalog field and carry no citation of their own.
Nothing on this page is a reconstruction or a schematic; every record above is observed, catalogued or computed.
| Dataset | Last refreshed | Horizon | Automated |
|---|---|---|---|
| Planetary satellite mean elements | no snapshot date | Mean elements (a, e, i, period) for every known natural satellite | No, refreshed by hand npm run generate:moons |