S2021_J_4 is a natural satellite of Jupiter in the NASA/JPL Solar System Dynamics planetary satellite tables.
- Planet: Jupiter
- Satellite: S2021_J_4
- Satellite code: 55515
- Physical parameters: not listed in the NASA/JPL planetary satellite physical parameters table
- Ephemeris: JUP347
- Reference frame: ecliptic
- Epoch (TDB): 2000-01-01.5
- Semi-major axis a: 23019700. km
- Eccentricity e: 0.265
- Argument of periapsis ω: 140.5 deg
- Mean anomaly M: 218.9 deg
- Inclination i: 164.6 deg
- Longitude of ascending node: 129.9 deg
- Sidereal period P: 713.7056 days
- Argument of periapsis precession period: 51.5 yr
- Longitude of ascending node precession period: 89.8 yr
- Mean elements reference: 47