evolveorbits(1) --- Imcat Users Guide --- section: imcattools_orbits --- last changed: Sun Apr 13 HST
evolveorbits - evolve orbits by two-body or time-centered leapfrogSYNOPSIS
evolveorbits dt nsteps [-writekepler] [-tcl nsubsteps] [-extravars vardefs] [-jupiter phase]DESCRIPTION
evolveorbits reads an lc catalog containing a set of positions r[3] and velocities v[3] from stdin, evolves the positions and velocities through nsteps steps of length and writes the results to stdout.
By default, it does this by converting from phase-space to Kepler orbital elements (a, e, i, omega, Omega, M) and incrementing M and then performing the inverse transformation. With -writekepler option, we also output the orbital elements. With -extravars option we carry defined variables along. For example, use -extrvars myscalar:1:myvector:3 to carry along myscalar and myvector[3] With option -tcl we do the evolution using time-centered leapfrog with nsubsteps steps of length dt / nsubsteps Times are given in units of earths dynamical time (approx 58 days). Distances are in AU. SEE ALSOmaketestpparfilepl(1), makeobs_circ(1), laplace3(1), evolve(1).
AUTHOR
Nick Kaiser --- kaiser@hawaii.edu