August 6, 2003

Mercury's vital statistics

Mercury's vital statistics
  Mercury Earth Mercury/Earth Ratio
Equatorial diameter 4,880 km 12,756 km 0.38
Mass 3.3 x 1020 t 5.9 x 1021 t 0.05
Mean density 5.42 5.52 0.98
Rotation period 58.7 Earth days 1 Earth day 58.7
Revolution period (Mercurian year) 88 Earth days 88 Earth days 0.24
Length of a solar day 176 Earth days 1 Earth day 176
Surface gravity 3.7 m/s2 9.8 m/s2 0.378
Natural satellites None 1 ---
Ring system No No ---
Orbit
Aphelion 70 million km 152 million km 0.46
Perihelion 46 million km 147 million km 0.31
Furthest distance from Earth 222 million km --- ---
Closest distance to Earth 77 million km --- ---

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