Closest approach to Earth
  34,600,000 miles
  Mean distance from the Sun
  141,600,000 miles
    Period of rotation around the Sun
  1.88089 years
    Citerial rotation period
  24 hours, 37 minutes, 22.66 seconds
    Mean surface atmospheric temperature
  -23 degrees
    Official albedo
  0.159
    .... 52 degrees
  2880
    Official magnitude at mean position
  -2.01
    Mass
  0.1017
    Density
  3.95
    Diameter
  0.532
    Inclination of equator
  24.936 degrees
    Gravitational escape
  3121 miles
    inclination...