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How fast does Mercury travel around the Sun?
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Mercury
Mercury as seen by the Messenger probe, January 14, 2008. This image shows half of the hemisphere missed by Mariner 10 in 1974–75 and was snapped by Messenger's Wide Angle Camera when it was about 27,000 km (17,000 miles) from the planet.
Mercury travels around the Sun with a mean orbital velocity of 47.36 km/sec. Its orbital period, or the length of a Mercurian year, is approximately 87.97 Earth days.1
Because Mercury has a highly eccentric (elongated) orbit, its speed varies as it moves around the Sun. According to Kepler’s laws of planetary motion, the planet travels most swiftly when it is at perihelion, its closest point to the Sun.2