imcattools_orbits(1) --- Imcat Users Guide --- section: imcattools_orbits --- last changed: Sun Apr 13 HST

imcattools_orbits - imcattools_orbits tools section

The tools in this section implement procedures useful for celestial mechanics. They allow one to convert orbits between Kepler elements and Cartesian phase space (convertorbits). One can compute approximate orbits from 3 observations (laplace3) and make a least squares solution (fitorbit). There are some utilities for generating observations (makeobs_circ, makeobs_inertial).

One can evolve these forward (evolveorbits), compute observable properties (orbs2obs). There is a utility (airmass) for computing the airmass of the observations. One can track the detection status of objects (getdet). Use getmoid to compute the MOID for an orbit. Use orbanim to generate a 3-D FITS image movie of the trajectories. Use r2n to find perpendicular components of a vector relative to a reference direction. Orbit conversion routines courtesy of Jim Heasley.

airmass - compute minimum air-mass for observation of a target

convertorbits - convert between Kepler elements and phase-space coordinates

evolveorbits - evolve orbits by two-body or time-centered leapfrog

fitorbit - find least squares orbit solution

getdet - keeps track of the detections of a set of objects

getmoid - compute the MOID from Kepler orbit elements

laplace3 - compute an approximate orbit from 3 observations

makeobs_circ - make observations for a circular orbit

makeobs_inertial - make a set of observations for an inertial observatory

orbanim - generate an animation of orbit trajectories

r2n - get perpendicular components of a vector

Nick Kaiser -- kaiser@hawaii.edu

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