def ring_density(Rout, rho_pl):
    """
    Calculate the density of the rings material around a ringed planet given the outer ring radius and the density of the host planet.
    
    Parameters:
    ------------
    
    Rout: float, ufloat, array-like;
    	outer ring radius in units of the planet radius Rp.
    	
    rho_pl: float, ufloat, array-like;
    	Density of the host planet.
    	
    Returns:
    --------
    
    rho_r: 
    	ring material density in same unit as rho_pl
    
    """
    
    return (2.46/Rout)**3 * rho_pl