galpy.orbit.Orbit.pmll

Orbit.pmll(*args, **kwargs)

NAME:

pmll

PURPOSE:

return proper motion in Galactic longitude (in mas/yr)

INPUT:

t - (optional) time at which to get pmll

obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer
(in kpc and km/s) (default=Object-wide default) OR Orbit object that corresponds to the orbit of the observer Y is ignored and always assumed to be zero

ro= distance in kpc corresponding to R=1. (default=Object-wide default)

vo= velocity in km/s corresponding to v=1. (default=Object-wide default)

OUTPUT:

pm_l(t) in mas/yr [*input_shape,nt]

HISTORY:

2019-02-21 - Written - Bovy (UofT)