Surface Weights and Surface Escape Velocities

The weight of one designated object on a planet, moon, star, or other astronomical body is directly proportional to the astronomical body’s mass and inverse-squarely proportional to the distance from the center of the astronomical body. The square of escape velocity is directly proportional to the astronomical body’s mass and inversely proportional to the distance from the center of the astronomical body. In both cases, it is assumed that the mass of the designated object is negligible compared to the mass of the astronomical body.

It is thus possible, given a list of masses and radii, to calculate, first of all, changes in weight when moving somewhere else in the Solar System. For the following objects, multiply your Earth weight by the factor given to find your weight on the surfaces of other bodies of the Solar System.

For these statistics, influence from outer bodies is not factored in.

Asterisked (*) statistics are very approximate. Error likely >10%.

Mercury: 0.377
Venus: 0.903
Earth: 1
Mars: 0.378
Jupiter: 2.639
Saturn: 1.176
Uranus: 0.924
Neptune: 1.155

Ceres: 0.029
Pluto: 0.067
Charon: 0.028
Haumea: 0.053
Makemake: 0.038*
Eris: 0.084

Sun: 27.901

Earth’s Moon: 0.165

Phobos: 0.00059
Deimos: 0.00026 (lower than Bank of America interest!)

Amalthea: 0.0020
Thebe: 0.0012
Io: 0.183
Europa: 0.134
Ganymede: 0.145
Callisto: 0.126
Leda: 0.0006
Himalia: 0.0063
Lysithea: 0.0013
Elara: 0.0032
Praxidike: 0.0002*
Ananke: 0.0010*
Carme: 0.0017*
Callirrhoe: 0.0003*
Pasiphaё: 0.0023*
Sinope: 0.0014*

Pan: 0.00017
Daphnis: 0.00004
Atlas: 0.00020
Prometheus: 0.00059
Pandora: 0.00055
Epimetheus: 0.0011
Janus: 0.0016
Mimas: 0.0065
Pallene: 0.00005
Enceladus: 0.012
Tethys: 0.015
Telesto: 0.00042
Calypso: 0.00037
Dione: 0.024
Helene: 0.00054
Polydeuces: 0.00010
Rhea: 0.027
Titan: 0.138
Hyperion: 0.0010
Iapetus: 0.023
Phoebe: 0.0050
Albiorix: 0.00059*
Siarnaq: 0.00074*
Ymir: 0.00033*

Bianca: 0.00092
Cressida: 0.0014
Juliet: 0.0017
Puck: 0.0030
Miranda: 0.0080
Ariel: 0.027
Umbriel: 0.023
Titania: 0.044
Oberon: 0.035
Caliban: 0.0013*
Sycorax: 0.0028*

Despina: 0.0025
Galatea: 0.0019
Larissa: 0.0033
Proteus: 0.0068
Triton: 0.079
Nereid: 0.0063
Halimede: 0.0011*

We can also calculate escape velocities:

Sun: 617450 m/s (0.2% of c)
Jupiter: 60190 m/s
Saturn: 36374 m/s
Neptune: 23591 m/s
Uranus: 21409 m/s
Earth: 11184 m/s
Venus: 10359 m/s
Mars: 5021 m/s
Mercury: 4249 m/s
Ganymede: 2741 m/s
Titan: 2639 m/s
Io: 2557 m/s
Callisto: 2440 m/s
Earth’s Moon: 2375 m/s
Europa: 2025 m/s
Triton: 1453 m/s
Eris: 1384 m/s
Pluto: 1229 m/s
Titania: 798 m/s
Oberon: 727 m/s
Rhea: 635 m/s
Charon: 579 m/s
Iapetus: 573 m/s
Ariel: 558 m/s
Umbriel: 517 m/s
Ceres: 517 m/s
Dione: 510 m/s
Tethys: 394 m/s
——Speed of sound: 340 m/s——
Enceladus: 239 m/s
Miranda: 193 m/s
Proteus: 167 m/s
Mimas: 159 m/s
Nereid: 146 m/s
——Wind Record on Mt. Washington: 103 m/s——
Himalia: 103 m/s
Phoebe: 102 m/s
Larissa: 80 m/s
——Minimum Hurricane Wind Speed for Category 5 Status: 70 m/s——
Puck: 69 m/s
Despina: 61 m/s
Amalthea: 57 m/s
Galatea: 57 m/s
Janus: 53 m/s
Hyperion: 53 m/s
Elara: 52 m/s
Juliet: 40 m/s
Epimetheus: 35 m/s
Thebe: 34 m/s
Cressida: 34 m/s
——Highest Legal Car Speed Limit in United States: 34 m/s——
Lysithea: 22 m/s
Prometheus: 22 m/s
Bianca: 22 m/s
Pandora: 21 m/s
Phobos: 11 m/s
——Average Speed of Usain Bolt on His 100m Record Time: 10 m/s——
Leda: 10 m/s
Atlas: 8 m/s
Pan: 7 m/s
Deimos: 6 m/s
Daphnis: 2 m/s
Pallene: 2 m/s

You won’t need to fire rockets to get off a Pallene. It’s still advised that you do, though, as otherwise you might plunge into Saturn.

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