Notes on Constants

Mean Radius

Polar and sub-primary equatorial radii are given for irregularly shaped bodies whose root-mean-square deviation from an ellipsoid is known to be greater that 1%

Radius given for gaseous bodies corresponds to a 1-bar surface

Mass

Earth's mass = 5.98x10^24 kg (6.578x10^21 tons)

Orbit Period

R = retrograde

Rotation Period

R = retrograde

Submajor Axis of Orbit

au = astronomical units

1 au = 149,599,000 kilometers (92,956,495 miles)

?

? = meaningful value can not be determined from available data