code: def _pmrapmdec(self,*args,**kwargs):
          
          lbdvrpmllpmbb= self._lbdvrpmllpmbb(*args,**kwargs)
          return coords.pmllpmbb_to_pmrapmdec(lbdvrpmllpmbb[:,4],
                                              lbdvrpmllpmbb[:,5],
                                              lbdvrpmllpmbb[:,0],
                                              lbdvrpmllpmbb[:,1],degree=True,
                                              epoch=None)
docs: Calculate pmra and pmdec