Romulus (moon)

Romulus
	Adaptive Optics observations of (87) Sylvia, showing its two satellites, Remus and Romulus.
Discovery
Discovered by	Michael E. Brown; Jean-Luc Margot;
Discovery date	18 February 2001
Designations
MPC designation	Sylvia I
Pronunciation	/ˈrɒmjʊləs/
Named after	Rōmulus
Alternative designations	(87) Sylvia I Romulus; S/2001 (87) 1;
Minor planet category	Main belt (Cybele)
Adjectives	Romulian, -ean ; (both /rɒˈmjuːliən/)
Orbital characteristics
	Epoch 1 September 2004 (JD 1795812.5)
Semi-major axis	1351.35±0.1 km
Eccentricity	0.0069±0.0037
Orbital period (sidereal)	3.6496+0.025; −0.024 d
Average orbital speed	27.0 m/s
Mean anomaly	167°±23°
Inclination	1.7°±1.0°; (with respect to Sylvia equator)
Longitude of ascending node	93.17°±1.85°
Argument of perihelion	175°±23°
Satellite of	87 Sylvia
Physical characteristics
Dimensions	10.8±5.6 km
Mass	9.319+20.7; −8.3×1014 kg
Equatorial escape velocity	~ 4.8 m/s (estimate)
Absolute magnitude (H)	10.7

Romulus is the outer and larger moon of the main-belt asteroid 87 Sylvia. It follows an almost-circular and close-to-equatorial orbit around the asteroid. In this respect it is similar to the other Sylvian moon Remus.

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