Pluto has 5 known moons. Pluto’s entire moon system is believed to have formed by a collision between the dwarf planet and another Kuiper Belt Object early in the history of the solar system.
| 1. Charon | 2. Nix | 3. Hydra | 4. Kerberos | 5. Styx |
| Name | Charon |
|---|---|
| Discovery date | 1978 (James Walter Christy) |
| Semi-major axis | 19 571.4 km |
| Diameter | 1208 km |
| Orbital period (Length of a year) |
6.3872304 Earth days |
| Name | Nix |
|---|---|
| Discovery date | 2005 (Hal A. Weaver, S. Alan Stern, Max J. Mutchler, Andrew J. Steffl, Marc W. Buie, William J. Merline, John R. Spencer, Eliot F. Young, und Leslie A. Young) |
| Semi-major axis | 48 675 km |
| Diameter | ~ 42 x 36 km |
| Orbital period (Length of a year) |
24.8562 Earth days |
| Name | Hydra |
|---|---|
| Discovery date | 2005 (Hal A. Weaver, S. Alan Stern, Max J. Mutchler, Andrew J. Steffl, Marc W. Buie, William J. Merline, John R. Spencer, Eliot F. Young, und Leslie A. Young) |
| Semi-major axis | 64 780 km |
| Diameter | ~ 55 x 40 km |
| Orbital period (Length of a year) |
38.2065 Earth days |
| Name | Kerberos |
|---|---|
| Discovery date | 2012 (Mark R. Showalter et al.) |
| Semi-major axis | 59 000 km |
| Diameter | ~ 12 x 4.5 km |
| Orbital period (Length of a year) |
32.1 Earth days |
| Name | Styx |
|---|---|
| Discovery date | 2011 (Mark R. Showalter et al.) |
| Semi-major axis | 42 000 km |
| Diameter | ~ 7 x 5 km |
| Orbital period (Length of a year) |
20.2 Earth days |
