UPSA Object Registry
Registry · solar system

Proteus

Natural satellite JPL Horizons
Mean radius
208 km
Orbital period
1.1223 d
Geometric albedo
0.06

Also known as

2 identifiers

Horizons 808NVIII

Recorded parameters

8 quantities with a single published value
ParameterValueUnitUncertainty As publishedSourceReference
Mean radius 208 km Mean radius (km) JPL Horizons JPL Horizons on-line ephemeris system
Orbital period 1.122315 d Orbital period JPL Horizons JPL Horizons on-line ephemeris system
Geometric albedo 0.06 Geometric Albedo JPL Horizons JPL Horizons on-line ephemeris system
GM 2.58 km^3/s^2 GM (km^3/s^2) JPL Horizons JPL Horizons on-line ephemeris system
Eccentricity e 0 e Eccentricity, e JPL Horizons JPL Horizons on-line ephemeris system
Inclination i deg 0.55 deg Inclination, i (deg) JPL Horizons JPL Horizons on-line ephemeris system
Mean density g cm 3 1.03 g cm^-3 Mean density (g cm^-3) JPL Horizons JPL Horizons on-line ephemeris system
Semi major axis a km 117,600 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/proteus · Registry entry updated 2026-08-14.