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Hubble Space Telescope
Are autoparallel observations allowed for ACS and what is their policy?

     ###Policies###

     * Are autoparallel observations allowed for ACS and what is their
     policy ?
     ACS is indeed able to make simultaneous observations using the
     WFC and the HRC. Such observations are added automatically
     by the scheduling system if doing so does not impact primary observations.
     Because of WFC and HRC sharing the same filter wheel,
     the choice of the parallel filter is decided by the choice of the filter
     for the primary observation. Therefore, 
     the parallel observations are property of the observer using the
     prime detector. For all other policies and comments,
     please read page 28 of Chapter 3 in the Instrument Handbook.