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 (can be Quantity)

obs=[X,Y,Z,vx,vy,vz] - (optional) position and velocity of observer

in the Galactocentric frame (in kpc and km/s) (default=[8.0,0.,0.,0.,220.,0.]; entries can be Quantity) OR Orbit object that corresponds to the orbit of the observer Y is ignored and always assumed to be zero

ro= (Object-wide default) physical scale for distances to use to convert (can be Quantity)

vo= (Object-wide default) physical scale for velocities to use to convert (can be Quantity)

OUTPUT:

pm_b(t) in mas/yr

HISTORY:

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