  We have been modeling the envelope of the secular light curve (Ferr\'in,
2010) of comet 1P/Halley. As the first step we have modeled the water
production rate of the comet, for several active regions as a function of
visual albedo and infrared albedo, and then we have used the correlation
between the water production rate and the reduced magnitude (Jorda, 2008) for
modeling the envelope of the secular light curve of the comet. We obtain
probable orientations of the rotation axis (I,$\Phi$). These orientations are
compared with several solutions by several authors. We have calculated the
surface temperature for the orientation of the rotation axis with minimal
standar deviation. We have found that for near and far values of the perihelion
the surface temperature as a function of the latitude is constant.
