def Beta22_1(X):
    """ Coefficient for the 1PN tidal correction to h_22 mode
   Defined in arXiv:1203.4352, eqn A15
   Input
     X -- mass fraction of object being tidally deformed
   Output
     double, coeff for 1PN tidal correction to h_22 mode """
    return (-202.0 + 560.0 * X - 340.0 * X * X + 45.0 * X * X * X) / 42.0 / (
        3.0 - 2.0 * X)
