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Mercury ☿
Planet Mercury

Mercury: The Smallest Planet     

Mercury is the first of eight planets in our solar system and is the closest to the sun. Planet Mercury moves from the morning sky to the evening sky several times a year. It never deviates far from the Sun so can be hard to locate. It is the smallet and also the most cratered planet.

Mercury Facts
      1. Mass (kg)
      2. 3.303e+23
      1. Radius (km)
      2. 2,439.7
      1. Density (gm/cm3)
      2. 5.42
      1. Distance from sun (km)
      2. 57,910,000
      1. Rotational period (days)
      2. 58.6462
      1. Orbital period (days)
      2. 87.969
      1. Orbital velocity (km/sec)
      2. 47.88
      1. Eccentricity of orbit
      2. 0.2056
      1. Tilt of axis (°)
      2. 0.00
      1. Inclination of orbit (°)
      2. 7.004
      1. Surface gravity (m/sec2)
      2. 2.78
      1. Escape velocity (km/sec)
      2. 4.25
      1. Albedo
      2. 0.10
      1. Magnitude (Vo)
      2. -1.9
      1. Surface temperature
      2. 179°C to -173°C
      1. Atmosphere
      2. He=42%, Na=42%, O2=15%
      1. Moons
      2. 0


    Mercury vs. Earth ratios


    diameter = 0.38
    gravity = 0.38
    surface pressure = 0
    solar irradiance = 6.7
    day = 176
    year = 0.24
    sun distance = 0.39

      
    diameter = 1
    gravity = 1
    surface pressure = 1
    solar irradiance = 1
    day = 1
    year = 1
    sun distance = 1





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