Planetary data for Mercury

Planetary data for Mercury

Table
Planetary data for Mercury
mean distance from Sun 57,910,000 km (0.4 AU)
eccentricity of orbit 0.2056
inclination of orbit to ecliptic 7.004°
Mercurian year (sidereal period of revolution) 87.9694 Earth days
maximum visual magnitude -1.9
mean synodic period* 116 Earth days
mean orbital velocity 47.9 km/sec
radius (equatorial and polar) 2,439.7 km
surface area 74,800,000 km2
mass 3.30 × 1023 kg
mean density 5.43 g/cm3
mean surface gravity 370 cm/sec2
escape velocity 4.3 km/sec
rotation period (Mercurian sidereal day) 58.6462 Earth days
Mercurian mean solar day 175.9 Earth days
inclination of equator to orbit less than 3°; probably nearly zero
magnetic field strength 0.003 gauss
mean surface temperature 440 K (332 °F, 167 °C)
surface temperature extremes 700 K (800 °F, 430 °C) to 90 K (-300 °F, -180 °C)
typical surface pressure about 10-15 bar
number of known moons none
*Time required for the planet to return to the same position in the sky relative to the Sun as seen from Earth.
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Universalium. 2010.

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