XMM-Newton Science Analysis System


heliocentriccorr (barycen-1.21) [xmmsas_20190531_1155-18.0.0]

Algorithm

   subroutine heliocentriccorr

      locate ODF orbit file
      locate earth ephemeris file

      calculate XMM-Newton attitude
      calculate Earth velocity

      Get the time of the observation mid point
      
      calculate Heliocentric correction

   end subroutine heliocentriccorr