galpy.orbit.Orbit.pmbb

Orbit.pmbb(*args, **kwargs)

NAME:

pmbb

PURPOSE:

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

INPUT:

t - (optional) time at which to get pmbb

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; Note that when Y is non-zero, the coordinate system is rotated around z such that Y’=0

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

HISTORY:

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