Wrapping the isochrone and kernel simulate functions.

def satellite(isochrone, kernel, stellar_mass, distance_modulus,**kwargs):
    """
    Wrapping the isochrone and kernel simulate functions.
    """
    mag_1, mag_2 = isochrone.simulate(stellar_mass, distance_modulus)
    lon, lat     = kernel.simulate(len(mag_1))

    return mag_1, mag_2, lon, lat