Mass (kg)

3.3 x 1023 

Diameter (km)

4879.4

Mean density (kg/m3)

5420

Escape velocity (m/s)

4300

Average distance from Sun

0.387 AU (57,909,175 km)

Rotation period (length of day in Earth days)

58.65

Revolution period (length of year in Earth days)    

87.97

Obliquity (tilt of axis degrees)

0

Orbit inclination (degrees)

7

Orbit eccentricity (deviation from circular)

0.206

Mean surface temperature (K)

452

Maximum surface temperature (K)

700

Minimum surface temperature (K)

100

Visual geometric albedo (reflectivity)

0.12

Largest known surface feature

Caloris Basin (1350 km diameter)

Atmospheric components

trace amounts of hydrogen and helium

Surface materials

basaltic and anorthositic rocks and regolith

Mass (kg)

4.87 x 1024

Diameter (km)

12104

Mean density (kg/m3)

5250

Escape velocity (m/s)

10400

Average distance from Sun

0.723 AU (108,208,930 km)

Rotation period (length of day in Earth days)

243.02 (retrograde)

Revolution period (length of year in Earth days)    

224.7

Obliquity (tilt of axis degrees)

178

Orbit inclination (degrees)

3.39

Orbit eccentricity (deviation from circular)

0.007

Mean surface temperature (K)

726

Visual geometric albedo (reflectivity)

0.59

Highest point on surface

Maxwell Montes
(17 km above mean planetary radius)

Atmospheric components

96% carbon dioxide,
3% nitrogen,
0.1% water vapor

Surface materials

basaltic rock and altered materials

Mass (kg)

5.98 x 1024

Diameter (km)

12756

Mean density (kg/m3)

5520

Escape velocity (m/s)

11200

Average distance from Sun

1 AU (149,597,890 km)

Rotation period (length of day in Earth days)

1 (23.93 hours)

Revolution period (length of year in Earth days)

365.26

Obliquity (tilt of axis degrees)

23.4

Orbit inclination (degrees)

0

Orbit eccentricity (deviation from circular)

0.017

Mean surface temperature (K)

281

Mean maximum surface temperature (K)

310

Mean minimum surface temperature (K)

260

Visual geometric albedo (reflectivity)

0.39

Highest point on surface

Mount Everest
(over 8 km above sea-level)

Atmospheric components

78% nitrogen,
21% oxygen,
1% argon

Surface materials

basaltic and granitic rock and altered materials

Mass (kg)

6.42 x 1023

Diameter (km)

6787

Mean density (kg/m3)

3940

Escape velocity (m/s)

5000

Average distance from Sun

1.524 AU (227,936,640 km)

Rotation period (length of day in Earth days)

1.026

Revolution period (length of year in Earth days)    

686.98

Obliquity (tilt of axis degrees)

25

Orbit inclination (degrees)

1.85

Orbit eccentricity (deviation from circular)

0.093

Maximum surface temperature (K)

310

Minimum surface temperature (K)

150

Visual geometric albedo (reflectivity)

0.15

Highest point on surface

Olympus Mons
(about 24 km above surrounding lava plains)

Atmospheric components

95% carbon dioxide,
3% nitrogen,
1.6% argon

Surface materials

basaltic rock and altered materials

Mass (kg)

1.90 x 1027

Diameter (km)

142,800

Mean density (kg/m3)

1314

Escape velocity (m/s)

59500

Average distance from Sun

5.203 AU (778,412,020 km)

Rotation period (length of day in Earth days)

0.41 (9.8 Earth hours)

Revolution period (length of year in Earth years)

11.86

Obliquity (tilt of axis degrees)

3.08

Orbit inclination (degrees)

1.3

Orbit eccentricity (deviation from circular)

0.048

Mean surface temperature (K)

120 (cloud tops)

Visual geometric albedo (reflectivity)

0.44

Atmospheric components

90% hydrogen,
10% helium,
.07% methane

Rings

Faint ring.
Infrared spectra imply dark rock fragments.

Mass (kg)

5.69 x 1026

Diameter (km)

120660

Mean density (kg/m3)

690

Escape velocity (m/s)

35600

Average distance from Sun

9.537 AU (1,426,725,400 km)

Rotation period (length of day in Earth days)

0.44 (10.2 Earth hours)

Revolution period (length of year in Earth years)

29.46

Obliquity (tilt of axis degrees)

26.7

Orbit inclination (degrees)

2.49

Orbit eccentricity (deviation from circular)

0.056

Mean temperature (K)

88 K (1 bar level)

Visual geometric albedo (reflectivity)

0.46

Atmospheric components

97% hydrogen,
3% helium,
.05% methane

Rings

Rings are 270,000 km in diameter, 
but only a few hundred meters thick. 
Particles are centimeters to decameters 
in size and are ice (some may be covered 
with ice); there are traces of silicate 
and carbon minerals. There are four main 
ring groups and three more faint, narrow 
ring groups separated by gaps called divisions.

Mass (kg)

8.68 x 1025

Diameter (km)

51118

Mean density (kg/m3)

1290

Escape velocity (m/s)

21300

Average distance from Sun

19.19 AU (2,870,972,200 km)

Rotation period (length of day in Earth days)

0.72 (17.9 Earth hours)(retrograde)

Revolution period (length of year in Earth days)

30,685 (84 Earth years)

Obliquity (tilt of axis degrees)

97.9

Orbit inclination (degrees)

0.77

Orbit eccentricity (deviation from circular)

0.047

Mean temperature (K)

59

Visual geometric albedo (reflectivity)

0.56

Atmospheric components

83% hydrogen,
15% helium,
2% methane (at depth)

Rings

Uranus has a system of narrow, faint rings. 
Ring particles are dark, and could 
consist of rocky or carbonaceous material

Mass (kg)

1.02 x 1026

Diameter (km)

49528

Mean density (kg/m3)

1640

Escape velocity (m/s)

23300

Average distance from Sun

30.07 AU (4,498,252,900 km)

Rotation period (length of day in Earth days)

0.67 (19.1 hours)

Revolution period (length of year in Earth days)

60,190 (164.8 Earth years)

Obliquity (tilt of axis degrees)

29.6

Orbit inclination (degrees)

1.77

Orbit eccentricity (deviation from circular)

0.009

Mean temperature (K)

48

Visual geometric albedo (reflectivity)

0.51

Atmospheric components

74% hydrogen,
25% helium,
1% methane (at depth)

Rings

Rings are narrow, and contain 
concentrations of particles 
called ring arcs.