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physical object > natural object > celestial body > natural satellite > Janus
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Janus comparison table
Subject is part of is a kind of is an instance of has radiu has discovery date has inclination has definition has period has eccentricity has discoverer
natural satellite satellite    Body orbiting a planet. Since 1957 the term has also been applied to man-made (artificial) satellites; many astronomers make the distinction by calling natural satellites moons (and the Earth's natural satellite the Moon).   
JanusSaturn natural satelliteR = 175 km1966i ≈ 0The innermost satellite of Saturn, just outside Saturn's rings. Named Janus for the first and the last.P = 0.75 dayse ≈ 0Dollfus

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