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galpy.orbit.Orbit.helioX

Orbit.helioX(*args, **kwargs)

NAME:

helioX

PURPOSE:

return Heliocentric Galactic rectangular x-coordinate (aka “X”)

INPUT:

t - (optional) time at which to get X

obs=[X,Y,Z] - (optional) position and velocity of observer
(in kpc and km/s) (default=[8.5,0.,0.,0.,235.,0.]) OR Orbit object that corresponds to the orbit of the observer

ro= distance in kpc corresponding to R=1. (default: 8.5)

OUTPUT:

helioX(t)

HISTORY:

2011-02-24 - Written - Bovy (NYU)