Pluto · natural satellite of a dwarf planet

Styx

Mean diameter: 10.4 km
Mean orbital distance: 43,200 km from centre
Orbital period: 20.16 Earth days

Compared with our Moon

Styx · 10.4 km

Moon · 3,474.8 km

One diameter scale. Circle shapes compare volume-equivalent diameters; irregular moons are not spheres.

Orbit & discovery

Surface gravity: Not available
Discovery: 2012
Discoverer / team: M.R. Showalter, H.A. Weaver, S.A. Stern, A.J. Steffl, M.W. Buie, W.J. Merline, M.J. Mutchler, R. Soummer, H.B. Throop
Provisional designation: S/2012 (134340) 1
JPL satellite ID: 905
Orbital eccentricity: 0.025
Inclination: 0 degrees

Inclination reference: equatorial. Mean-element epoch: 2000-01-01.5 TDB · PLU060.

Diameters use volume-equivalent mean radii, including for irregular bodies. Mean orbital elements describe an orbit; they are not live positions. Missing physical measurements remain unavailable.

Physical measurements & uncertainties

Mean radius · km: 5.2 ±1.0 [3]
GM · km³/s²: <0.0003 [PLU060]
Density · g/cm³: n/a

Missions in the Pluto system · 1 records

1 launches · 0 linked events

These records cover the planetary system. A system mission did not necessarily visit this moon. Dedicated targets are marked separately; programme events include the journey and briefings. Launch outcomes do not establish arrival, landing success or present spacecraft operation.

Dedicated targets only

PLANETARY SYSTEM

New Horizons

January 19, 2006 · UTC

United Launch Alliance · Atlas V 551

1 records from the complete 9,386‑record production catalogue.

Sources & measurements