Orbit2Kepler

This program computes the osculating Keplerian elements from position and velocity of a given inputfileOrbit. The inputfileOrbit must contain positions and velocities (see OrbitAddVelocityAndAcceleration).

The outputfileKepler is an instrument file (MISCVALUES) with the Keplerian elements at each epoch in the following order

• Ascending Node $\Omega$ [degree]
• Inclination $i$ [degree]
• Argument of perigee $\omega$ [degree]
• major axis $a$ [m]
• eccentricity $e$
• mean anomaly $M$ [degree]
• transit time of perigee $\tau$ [mjd]

The data of inputfileInstrument are appended as values to each epoch.

Name	Type	Annotation
outputfileKepler	filename	instrument file (MISCVALUES: Omega, i, omega [degree], a [m], e, M [degree], tau [mjd], ...)
inputfileOrbit	filename	position and velocity at each epoch define the kepler orbit
inputfileInstrument	filename	data is appended
GM	double	Geocentric gravitational constant

This program is parallelized.