code: def y(self,*args,**kwargs):
          
          out= self._orb.y(*args,**kwargs)
          if len(out) == 1: return out[0]
          else: return out
docs: NAME:
  
             y
  
          PURPOSE:
  
             return y
  
          INPUT:
  
             t - (optional) time at which to get y (can be Quantity)
  
             ro= (Object-wide default) physical scale for distances to use to convert (can be Quantity)
  
             use_physical= use to override Object-wide default for using a physical scale for output
  
          OUTPUT:
  
             y(t)
  
          HISTORY:
  
             2010-09-21 - Written - Bovy (NYU)