text: 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
  Sideral rotation period:
  24 hours, 37 minutes, 22.66 seconds
  Mean surface atmospheric temperature:
  -23 degrees
  Visual albedo:
  0.159
  Pole Star:
  BD 52, Degrees 2880
  Visual magnitude at mean opposition:
  -2.01
  Mass:
  0.10174
  Density:
  3.93
  Diameter:
  0.