makeobs_circ(1) --- Imcat Users Guide --- section: imcattools_orbits --- last changed: Sun Apr 13 HST
makeobs_circ - make observations for a circular orbitSYNOPSIS
makeobs_circ parfileDESCRIPTION
makeobs_circ generates a catalog containing triplets of observations consisting of: t the time t re[] the position of the earth ve[] velocity of the earth ra[] position of the asteroid va[] velocity of the asteroid va rho[] the position of the observor relative to re[] n[] the direction vector
It generates these according to parameters in 'parfile', another lc cat. These are: pe the phase of the earths orbit (degrees, winter = 0.0) t0 the local time of the central observation (hours, midnight = 0.0) dt the interval between the observations (hours) ra the radius of the asteroid's orbit (AU) ia the inclination (deg) la the longitude of the ascending node (deg) pa the phase of the asteroid in its orbit (deg) sigma the uncertainty astrometry (arcsec) nreal the number of realizations Both the earth and asteroid are in circular orbits. Both observatory latitude and tilt of earth's axis are hard-wired to 20 deg. We use an idealised model where the year has precisely 360 days Output times are given in units of earths dynamical time (approx 58 days). Distances are in AU. SEE ALSOmakeobs_inertial(1), laplace3(1).
AUTHOR
Nick Kaiser --- kaiser@hawaii.edu