UPSA Object Registry
Registry · solar system

Io

Natural satellite JPL Horizons
Mean radius
1,821.5 km
Density
3.528 g cm^-3
Geometric albedo
0.63

Also known as

2 identifiers

Horizons 501JI

Recorded parameters

4 quantities with a single published value
ParameterValueUnitUncertainty As publishedSourceReference
Mean radius 1,821.49 km Mean radius (km) JPL Horizons JPL Horizons on-line ephemeris system
Density 3.528 g cm^-3 Density (g cm^-3) JPL Horizons JPL Horizons on-line ephemeris system
Geometric albedo 0.63 Geometric Albedo JPL Horizons JPL Horizons on-line ephemeris system
Rotational period Synchronous Rotational period JPL Horizons JPL Horizons on-line ephemeris system

Provenance

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

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