Mars + Satellite
| Phobos |
Albedo
0.071
Apoapsis
9,519.61 km (6.36347e-5 AU, 5,915.211 mi)
Axial tilt
0 rad (0 °, 0 grad)
Color
#999999
Composition
Rock and ice mix
Date of discovery
18 August 1877
Escape speed
0.0114 km/s (41.04 km/h, 0.00708 mi/s, 25.501 mph)
Inclination
0.0191 rad (1.093 °, 1.214 grad)
Lunar mass
1.073e+16 kg (1.4602e-7 M☾, 1.79552e-9 M⊕)
Lunar surface area
2,997 km² (1,157.148 mi², 7.90369e-5 A☾, 5.87564e-6 A⊕)
Maximum temperature
269 K (-4.15 °C, 24.53 °F, 484.2 °R)
Mean radius
11.1 km (6.897 mi)
Mean temperature
233 K (-40.15 °C, -40.27 °F, 419.4 °R)
Minimum temperature
161 K (-112.15 °C, -169.87 °F, 289.8 °R)
Orbital eccentricity
0.0151
Orbital speed
2.138 km/s (7,696.8 km/h, 1.328 mi/s, 4,782.57 mph)
Order
1
Periapsis
9,236.39 km (6.17415e-5 AU, 5,739.227 mi)
Planet density
1,872 kg/m³ (1.872 g/ml, 116.865 lb/ft³)
Rotation speed
0.00306 km/s (11 km/h, 0.0019 mi/s, 6.835 mph)
Semi-major axis
9,378 km (6.26881e-5 AU, 5,827.219 mi)
Sidereal day
7.654 h (0.319 da)
Sidereal period
0.319 da (8.73101e-4 a)
Surface gravity
0.00581 m/s² (0.0191 ft/s², 5.92455e-4 g)
Synodic period
0.319 da (8.73648e-4 a)
Discoverer
Asaph Hall +
Member of
Moon +
Primary
Mars +
Categories Astronomy +, Mars +, Moon +, Solar system +
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