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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