Parameters

The time to complete one orbit.

 

 

More generally: P = sqrt( K a^3 )

where a is the semi major axis of the orbit, and K is inversely proportional to the sum of the masses of the central body and the orbiting body.

 

The location of the greatest distance between the orbiting body and the central body when the orbit is an ellipse.

The apocenter is diametrically opposite the pericenter on the major axis of the orbit.

 

The shortest distance between the center of the orbiting body and the center of the orbited body.

where q is the pericenter distance

a is the length of the semi major axis and

e is the eccentricity of the orbit.

 

The semi minor axis of an ellipse runs from the center of the ellipse (a point halfway between and on the line running between the foci) to the edge of the ellipse.

The semi minor axis is half of the minor axis.

 

Average angular velocity needed to complete one orbit.

 

True anomaly is an angular parameter that defines the position of a body moving along a Keplerian orbit. It is the angle between the direction of periapsis and the current position of the body, as seen from the main focus of the ellipse (the point around which the object orbits).

 

Select here the format to define the orbit Epoch (which might not be the scenario Epoch).

 

When Julian Format is selected, enter here the Julian date number of the Epoch, then apply. You can then check the corresponding Date and Time that are computed.

 

When Date Format is selected, enter here the DD/MM/YY date of the Epoch.

 

When Date Format is selected, enter here the HH:MM:SS time of the Epoch.

 

Click this button to use the current scenario date as the orbit Epoch.