UPSA Object Registry
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Hydra

Natural satellite JPL Horizons
Density
1.21 g cm^-3
Orbital period
38.2 days

Also known as

2 identifiers

Horizons 903PIII

Recorded parameters

6 quantities with a single published value
ParameterValueUnitUncertainty As publishedSourceReference
Density 1.21 g cm^-3 Density (g cm^-3) JPL Horizons JPL Horizons on-line ephemeris system
Orbital period 38.2 days Orbital period, days JPL Horizons JPL Horizons on-line ephemeris system
Eccentricity e 0.009 e Eccentricity, e JPL Horizons JPL Horizons on-line ephemeris system
Inclination deg 0.3 deg. Inclination, deg. JPL Horizons JPL Horizons on-line ephemeris system
Radius km 18.5 km Radius (km) JPL Horizons JPL Horizons on-line ephemeris system
Semi major axis a km 65,200 km Semi-major axis, a (km) JPL Horizons JPL Horizons on-line ephemeris system

Provenance

where this card came from
ArchiveRead at (UTC)Record
JPL Horizons 2026-08-14 17:11 open at source

Machine-readable: /api/v1/object/hydra · Registry entry updated 2026-08-14.