Planet

Planets and Moons of Earth's Solar System

Body Mass (Earths) Diameter Grav (G) Day Orb Radius Orbital Period Temp (K)
km Earths Mhex AU Mhex
Mercury 0.056 4,878 0.38 2.5 0.37 59 d 0.38 28 G 88 d 600/95
Venus 0.82 12,104 0.95 6 0.91 243 d 0.72 54 G 223 d 750
Earth 1.0 12,756 1.0 6.5 1.0 1 d 1.0 75 G 1 y 290
Luna 0.012 3,476 0.27 1.5 0.16 t/l 192 30 d 370/120
Mars 0.11 6,787 0.53 3.5 0.39 25 h 1.52 112 G 23 mo 220
Phobos 2x10-9 22.2 - - t/l 4.5 8 h 315
Deimos 3x10-10 12.6 - - t/l 12 20 h 315
Jupiter 318 142,800 11.19 69 2.6 10 h 5.20 390 G 12 y 100
Io 0.012 3,630 0.28 2 0.18 t/l 210 42 h 130
Europa 0.008 3,138 0.25 1.5 0.14 t/l 340 3.5 d 140
Ganymede 0.026 5,262 0.41 2.5 0.14 t/l 540 7 d 140
Callisto 0.016 4,800 0.38 2.5 0.12 t/l 975 17 d 155
Saturn 95 120,660 9.46 57 1.1 10 h 9.54 710 G 30 y 100
Mimas 6.4x10-6 392 0.03 - - t/l 90 22 h
Enceladus 1.4x10-5 498 0.04 0.5 - t/l 120 33 h
Tethys 1.3x10-4 1,060 0.08 0.5 - t/l 150 41 h
Dione 1.8x10-4 1,120 0.09 0.5 - t/l 190 2.7 d
Rhea 4.2x10-4 1,530 0.12 1.0 - t/l 260 4.5 d
Titan 0.023 5,150 0.40 2.5 0.14 t/l 615 16 d 105
Hyperion 2.9x10-6 286 0.02 - - t/l 740 21 d
Iapetus 3.1x10-4 1,460 0.11 0.5 - t/l 1780 79 d
Phoebe 6.7x10-7 220 0.02 - - t/l 6480 550 d
Uranus 15 51,118 4.01 26 0.92 17 h 19.22 1400 G 84 y 64
Miranda 1.2x10-5 472 0.04 - - 65 34 h
Ariel 2.1x10-4 1,158 0.09 0.5 - 97 60 h
Umbriel 2.2x10-4 1,170 0.09 0.5 - 133 4.1 d
Titania 5.8x10-4 1,578 0.12 0.5 - 217 8.5 d
Oberon 5.1x10-4 1,523 0.12 0.5 - 292 13.5 d
Neptune 17 49,528 3.88 25 1.2 16 h 30.06 2200 G 165 y 59
Larissa 193 0.02 - - 37 13 h
Proteus 418 0.03 - - 59 26 h
Triton 3.6x10-3 2,700 1.5 0.1 180 5.9 d 38
Neireid ? 340 - - 2760 360 d
Pluto 0.017 2,274 0.18 1.0 0.07 6.4 d 39.5 2900 G 248 y 50
Charon 0.002 1,172 0.09 0.5 - t/l 8 6.4 d 50
The Planets

Body:
The accepted name of the world.

Mass:
Mass of the world in Earth masses.

Diameter:
The diameter of the world in kilometers, Earths, and Megahexes (1 Mhex = 1000 hexes = 2 km). Megahex values are rounded. Diameters less than 500 km are not shown.

Grav:
Surface gravity of the world in Gs. This is not necessarily a useful number for gas giants (where it refers to the cloud tops). A dash indicates a value less than 0.1G.

Day:
The period of revolution for the world. Abbreviations here and for orbital period are h=hour, d=day, mo=month, y=year. The notation "t/l" indicates that the world is tide-locked, with its day equal to its orbital period.

Orb Radius:
The mean radius of the world's orbit in AUs and Megahexes. (Mercury, Pluto, and Neireid have significantly eccentric orbits, though.) The notation "G" indicates that the value is actually in Gigahexes (thousands of Megahexes).

Orbital Period:
The period of revolution for the world; its year, if it is a planet. Triton and Phoebe orbit retrograde.

Temp:
The mean surface temperature in kelvins. If two values are present, they represent day and night. Other worlds show temperature cycles as well, of course, but these are the important cases where the information was available.

Copyright © 1999 by B.C. Holmes. Last updated November 6th, 1999.
Fuzion copyright © the Fuzion Group, 1997. All rights are reserved.
Star Hero and Hero Games are registered trademarks of Hero Games. All rights reserved.

Back to the Empire main page.