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Property:Semi-major axis

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The semi-major axis of any ellipse is half the length of the major axis, which in turn is the line segment that passes through the foci of that ellipse and joins two opposite points of the ellipse. In astronomy, the semi-major axis of an orbit is the maximum distance of the orbiting body from the center of that orbit. The center is not the location of the primary; the primary in any two-body orbit configuration is always at a focus of the orbit. The semi-major axis may be computed as the arithmetic mean of the periapsis and apoapsis.

The usual object in view is a planet or a moon, and the primary is either the sun or whatever planet the moon is orbiting. The approved units for displaying planetary distances are km,AU,mi.


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Pages using the property "Semi-major axis"

Showing 25 pages using this property.

A

Ariel +191,020 km (0.00128 AU, 118,694.325 mi)  +

C

Callisto +1,882,700 km (0.0126 AU, 1,169,855.544 mi)  +
Ceres +413,904,656.555 km (2.767 AU, 257,188,429.916 mi)  +
Charon +19,640 km (1.31285e-4 AU, 12,203.73 mi)  +

D

Deimos +23,460 km (1.5682e-4 AU, 14,577.368 mi)  +
Dione +377,400 km (0.00252 AU, 234,505.488 mi)  +
Dysnomia +37,350 km (2.49669e-4 AU, 23,208.214 mi)  +

E

Earth +149,597,886.456 km (1 AU, 92,955,817.063 mi)  +
Enceladus +238,020 km (0.00159 AU, 147,898.771 mi)  +
Eris +1.01326e+10 km (67.732 AU, 6.29608e+9 mi)  +
Europa +671,100 km (0.00449 AU, 417,002.207 mi)  +

G

Ganymede +1,070,400 km (0.00716 AU, 665,115.724 mi)  +

H

Hydra (moon) +64,780 km (4.33028e-4 AU, 40,252.426 mi)  +
Hyperion +1,481,100 km (0.0099 AU, 920,312.873 mi)  +

I

Iapetus +3,561,300 km (0.0238 AU, 2,212,889.227 mi)  +
Io +421,800 km (0.00282 AU, 262,094.369 mi)  +

J

Jupiter +778,570,000 km (5.204 AU, 483,780,969.14 mi)  +

M

Mars +227,920,000 km (1.524 AU, 141,622,922.135 mi)  +
Mercury (planet) +57,910,000 km (0.387 AU, 35,983,605.742 mi)  +
Mimas +185,520 km (0.00124 AU, 115,276.784 mi)  +
Miranda +129,800 km (8.67659e-4 AU, 80,653.981 mi)  +
Moon +384,400 km (0.00257 AU, 238,855.086 mi)  +

N

Nemesis +1.31646e+13 km (88,000 AU, 8.18011e+12 mi)  +
Neptune +4.49506e+9 km (30.048 AU, 2.7931e+9 mi)  +
Nereid +5,513,400 km (0.0369 AU, 3,425,867.931 mi)  +
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