ow, and we'll use 'et[0]' as the epoch at which to compute the
      % direction from the spacecraft to the star.
      %
      % The data below are for the star with catalog number 6000
      % in the Hipparcos catalog. Angular units are degrees; epochs
      % have units of Julian years and have a reference epoch of J1950.
      % The reference frame is J2000.
      %

      parallax_deg = 0.000001056;

      ra_deg_0     = 19.290789927;
      ra_pm        = -0.000000720;
      ra_epoch     = 41.2000;

  