galpy.orbit.Orbit.helioY

Orbit.helioY(*args, **kwargs)

NAME:

helioY

PURPOSE:

return Heliocentric Galactic rectangular y-coordinate (aka “Y”)

INPUT:

t - (optional) time at which to get Y (can be Quantity)

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

in the Galactocentric frame (in kpc and km/s) (default=[8.0,0.,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)

OUTPUT:

helioY(t) in kpc

HISTORY:

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