galpy.orbit.Orbit.vbb¶
- Orbit.vbb(*args, **kwargs)[source]¶
NAME:
vbb
PURPOSE:
return velocity in Galactic latitude (km/s)
INPUT:
t - (optional) time at which to get vbb (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; Note that when Y is non-zero, the coordinate system is rotated around z such that Y’=0
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:
v_b(t) in km/s [*input_shape]
HISTORY:
2019-02-28 - Written - Bovy (UofT)