Mercury

Mercury is the 1st planet in the Solar System.

It has no moons.

Orbital Parameters

Mean Distance from Sun: 57.9 million km = 0.387 AU

Maximum Distance from Sun: 69.7 million km = 0.467 AU

Minimum Distance from Sun: 45.9 million km = 0.306 AU

Sidereal Period (year): 87.969 Earth-days

Synodic Period: 115.88 Earth-days

Rotational Period (day): 58.6461 Earth-days

Mean Orbital Velocity: 47.87 km/sec

Orbital Inclination: 7º 00' 15.5"

Axial inclination: negligible

Physical Parameters

Diameter: 4,878 kilometres

Oblateness: negligible

Mass: 3.3 x 1023 Kilograms = 0.055 x Earth

Volume: 0.056 x Earth

Density: 5.44 x (the density of water)

Surface Gravity: 0.38 x Earth

Escape Velocity: 4.25 kilometres per second

Albedo: 0.06

Maximum daytime temperature: +427ºC

Minimum nightime temperature: -183ºC

Mariner 10 photographed a crater strewen Mercury

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