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20 Massalia

Minor Planet Designation20 Massalia
Asteroid GroupMain Asteroid Belt (Massalia family)
Orbital Period3 years, 9 months
Distance from the SunSemi-Major Axis: 360,353,705 km (2.41 AU)
Perihelion: 309,098,064 km (2.07 AU)
Aphelion: 411,609,346 km (2.75 AU)
Diameter (Mean)145.5 kilometres
NotesMassalia is a dense stony asteroid with a somewhat flattened aspect, being 160km on its longest diameter but only about 130km on its shortest. An impact in the distant past broke away shattered fragments of Massalia, creating a swarm of small asteroids known as the Massalia family.