UPSA Object Registry

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Iapetus

Natural satellite JPL Horizons

Mass: 180.59 1e19 kg
Density: 1.088 g/cm^3
Orbital period: 79.33 d
Geometric albedo: 0.6

Also known as

2 identifiers

Horizons 608SVIII

Recorded parameters

10 quantities with a single published value

Parameter	Value	Unit	Uncertainty	As published	Source	Reference
Mass	180.59	1e19 kg		Mass (10^19 kg)	JPL Horizons	JPL Horizons on-line ephemeris system
Density	1.088	g/cm^3		Density (g/cm^3)	JPL Horizons	JPL Horizons on-line ephemeris system
Orbital period	79.33	d		Orbital period	JPL Horizons	JPL Horizons on-line ephemeris system
Geometric albedo	0.6			Geometric Albedo	JPL Horizons	JPL Horizons on-line ephemeris system
GM	120.52	km^3/s^2		GM (km^3/s^2)	JPL Horizons	JPL Horizons on-line ephemeris system
Eccentricity e	0.0283	e		Eccentricity, e	JPL Horizons	JPL Horizons on-line ephemeris system
Inclination i deg	7.489	deg		Inclination, i (deg)	JPL Horizons	JPL Horizons on-line ephemeris system
Radius km	734.5	km		Radius (km)	JPL Horizons	JPL Horizons on-line ephemeris system
Rotational period	Synchronous			Rotational period	JPL Horizons	JPL Horizons on-line ephemeris system
Semi major axis a km	3,560.84	km		Semi-major axis, a (km)	JPL Horizons	JPL Horizons on-line ephemeris system

Provenance

where this card came from

Archive	Read at (UTC)	Record
JPL Horizons	2026-08-14 17:09	open at source

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