Saturday, March 23, 2013

Phobos: Facts About Martian Moon



NASA's Mars Reconnaissance Orbiter took this image of the larger of Mars' two moons, Phobos, from a distance of about 6,800 km (about 4,200 miles).
CREDIT: NASA/JPL/University of Arizona
Facts about Phobos:
  • Radius of moon: 6.9 miles (11.1 km)
  • Semi-major axis around Mars (distance from planet's center): 5,826 miles (9,376 km)
  • Closest approach: 5,738 miles (9,234 km)
  • Farthest approach: 5,914 miles (9,518 km) 
  • Orbit eccentricity: 0.0151
  • Orbit inclination: 1.075 degrees
  • Time to make one orbit: 7.65 hours
  • Mass: 1.0659 x 10^16 kg
  • Density: 1.872 g/cm^3
  • Surface gravity: 0.0057m/s^2
  • Escape velocity: 25 mph (41 km/h)

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