Dwarf Planet
Sedna
TypeDwarf Planet
Mass~1 × 10²¹ kg
Diameter995 km
Orbital Radius75,700 million km
Orbital Period4,160,000 days
Rotation Period10.3 hours
Known Moons0
Surface Gravity~0.25 m/s²
Average Temp-261 °C
AtmosphereNone
Discovered ByMike Brown
Discovery Year2003
About Sedna
A deeply remote world whose 11,400-year loop never brings it closer than 76 AU to the Sun. Some astronomers argue it belongs to the inner Oort Cloud. Almost as red as Mars. Its strange orbit fuels speculation about an unseen distant planet.
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