Asteroid
Sylvia
TypeAsteroid
Mass~1.5 × 10¹⁹ kg
Diameter280 km
Orbital Radius522 million km
Orbital Period1,879 days
Rotation Period5.18 hours
Known Moons2
Surface Gravity~0.03 m/s²
Average Temp-110 °C
AtmosphereNone
Discovered ByNorman Pogson
Discovery Year1866
About Sylvia
The first triple asteroid ever found. Romulus and Remus, its two moons, were spotted in 2001 and 2004. A porous, primitive body riddled with internal cavities.
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