UPSA Object Registry

Registry · solar system

Nereid

Natural satellite JPL Horizons

Mean radius: 170 km
Geometric albedo: 0.2

Also known as

2 identifiers

Horizons 802NII

Recorded parameters

10 quantities with a single published value

Parameter	Value	Unit	Uncertainty	As published	Source	Reference
Mean radius	170	km		Mean radius (km)	JPL Horizons	JPL Horizons on-line ephemeris system
Geometric albedo	0.2			Geometric Albedo	JPL Horizons	JPL Horizons on-line ephemeris system
GM	n.a.	km^3/s^2		GM (km^3/s^2)	JPL Horizons	JPL Horizons on-line ephemeris system
Arg of periapse w	290.3	w		Arg of periapse, w	JPL Horizons	JPL Horizons on-line ephemeris system
Eccentricity e	0.749	e		Eccentricity, e	JPL Horizons	JPL Horizons on-line ephemeris system
Inclination i	5.8	i		Inclination, i	JPL Horizons	JPL Horizons on-line ephemeris system
Mean anomaly m deg	318	deg		Mean anomaly, M (deg)	JPL Horizons	JPL Horizons on-line ephemeris system
Mean density g cm 3	n.a.	g cm^-3		Mean density (g cm^-3)	JPL Horizons	JPL Horizons on-line ephemeris system
Semi major axis a km	5,504,000	km		Semi-major axis, a (km)	JPL Horizons	JPL Horizons on-line ephemeris system
Sid orbital period	360.1403	d		Sid. orbital period	JPL Horizons	JPL Horizons on-line ephemeris system

Provenance

where this card came from

Archive	Read at (UTC)	Record
JPL Horizons	2026-08-14 17:11	open at source

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