Styx
A confirmed moon in the Pluto system.
Physical measurements
- Mean radius
- 5.2 ± 1 kmmeasured · Source estimate; uncertainty is the source-reported standard error when available.
- GM · gravitational parameter
- < 0.0003 km³ s⁻²upper-limit · Source bound; confidence level not specified in the summary table.
- Mass
- < 4.4949e+15 kgupper-limit · GM bound converted using nominal CODATA G; confidence unspecified, not a measured mass.
- Mean density
- — Source reports no value.
Orbit descriptions
Mean elements describe an average orbit. They are not positions for a chosen date.
PLU060 · equatorial plane · 2000-01-01.5 TDB
- Semimajor axis
- 43,200 km
- Sidereal period
- 20.16 days
- Eccentricity
- 0.025
- Inclination to reference plane
- 0°
- Argument of periapsis
- 322.5°
- Mean anomaly
- 358.1°
- Ascending node
- 0°
- Apsidal / nodal precession periods
- — / — years
- Reference-plane pole RA / Dec
- — / —°
- Plane tilt to parent equator
- —°
- Reference center
- Not specified in this summary sourceThe summary table identifies a parent system but does not explicitly specify the reference center for each solution. Do not infer a physical-primary center, especially for Pluto’s circumbinary moons.
Orientation
No supported orientation model in the admitted PCK source.
Identity & availability
- Stable catalog ID
- styx
- JPL / NAIF satellite ID
- 905
- Names & designations
- Styx · S/2012 (134340) 1
- Discovery / rediscovery years
- 2012M.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
No validated dated trajectory admitted in catalog 1.0.0. Mean elements are not ephemerides.
No image or global texture admitted in this catalog release.No environment measurements admitted in this catalog release.
Sources & evidence
- JPL discovery circumstancestable tr[466] (zero-based); pluto / Styx · References: IAUC 9253
- JPL confirmed small-body satellitesdata[327].sat; primary=134340 · References: Showalter et al. (2012), IAUC 9253
- JPL physical parameters#sat_phys_par; Pluto / Styx / NAIF 905; mean radius · References: 3
- JPL physical parameters#sat_phys_par; Pluto / Styx / NAIF 905; GM · References: PLU060
- NIST CODATA 2022Table of universal constants, Newtonian constant of gravitationVerified numeric transcription; see acquisition notes in the download.
- JPL physical parameters#sat_phys_par; Pluto / Styx / NAIF 905; density · References: n/a
- JPL mean orbital elements#sat_elem row ID=456; Pluto / Styx / NAIF 905 · References: 6
Full catalog, uncertainty and source manifests · All Pluto moons · Moon model limits