Registry · solar system

Stephano

Natural satellite JPL Horizons

Also known as

2 identifiers

Horizons 720S1999_U2 UXX 1999U2

6 quantities with a single published value

Parameter	Value	Unit	As published	Source	Reference
Arg of periapse w	17.1	w	Arg of periapse, w	JPL Horizons	JPL Horizons on-line ephemeris system
Eccentricity e	0.235	e	Eccentricity, e	JPL Horizons	JPL Horizons on-line ephemeris system
Inclination i	143.6	i	Inclination, i	JPL Horizons	JPL Horizons on-line ephemeris system
Mean anomaly m deg	164.4	deg	Mean anomaly, M (deg)	JPL Horizons	JPL Horizons on-line ephemeris system
Semi major axis a km	7,951,400	km	Semi-major axis, a (km)	JPL Horizons	JPL Horizons on-line ephemeris system
Sid orbital period	677.5575	d	Sid. orbital period	JPL Horizons	JPL Horizons on-line ephemeris system

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/stephano · Registry entry updated 2026-08-14.