Instructions for Visiting Astronomers

  • Observers who wish to use their own filters (this is only possible in Visitor Mode) must comply with the non-standard filter policy.
  • Due to operational constraints at most 10 MXU masks can be loaded into the instrument at once (and only at day time) for the next night.

    • read the User Manual,
    • learn how to use the Preparation Software,
    • know how to use P2PP,
    • be able use the ETC to estimate the exposure time (DIT)
    • have a defined observing strategy
    • have a possible backup plan (should your source not be observable).

    Once at the observatory, you will receive support from an astronomer, of the Paranal Science Operations (PSO) team, to prepare your observations; but we can be contacted anytime beforehand to answer any pending question.

    PSO has prepared OBs for most of the setup necessary for photometric standards calibrations. They can be used at any time for a visitor run and if needed can be modified online (at the console).

    Calibrations of the data taken over night are done automatically on the next morning. The completeness and quality of these calibrations are checked by your daytime support astronomer. Only special request OBs need to be prepared by yourself.
    Weather permitting PSO will take twilight sky flats and other specific observations according to the Calibration Plan. Since it is a slow process to get a full set of possible filters/cameras combinations, it is important for us to know upon your arrival the list of settings you will be using.

    All required information about visitor mode observations runs can be found in the pages of Paranal Science Operations under VA info.