# The University of Texas at Arlington

## UTA Planetarium

### Planetary Weight and Age Calculator

#### How much do I weigh?

Your weight varies directly with your mass (your mass is how much matter is present in your body) and the mass of the planet you're on. The more mass you have, the more you'll weigh. Also, the more mass the planet has, the more you'll weigh. So what do I weigh on all the planets? Find out below.

#### How old am I?

Your age in years equals the number of times the Earth has revolved around the Sun while you've been alive. Translating the number of Earth revolutions into revolutions on another planet and converting back to Earth-years gives your age on that planet. Try it out below.

#### Mercury

 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

#### Venus

 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

#### Earth

 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

#### Mars

 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

#### Jupiter

 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

#### Saturn

 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

#### Uranus

 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

#### Neptune

 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 (16 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