For Hb12, the CAL for 2011 is estimated 11.3 K for X-band and 4.9 K for S-band. The efficiency is estimated as 60% (equiv to 40.8 Jy/K) at S-band. A X-band, it varies with elevation.
Aperture Efficiency = -2.77e-5*El^2 +3.03e-3*El + 0.555
Jy/K = 1.78e-3*El^2 -0.195*El + 43.5