Observing time type: Nighttime

  • Observing time
    Director Discretionary Time at GTC

    We are pleased to announce the availability of Director Discretionary Time (DDT) at the 10.4m GTC facility (GTC-DDT), which includes up to 10 nights per...

  • Observing time
    Director Discretionary Time at WHT, INT, NOT y TNG

    DDT proposals are accepted for every night allocated as Service Time on the NOT, TNG, and INT. For the WHT, DDT nights are scheduled exclusively as CAT DDT (see...

  • Observing time
    IACNordic Collaborative Time

    Following the Agreement between IAC and NOTSA for the continued operation of the Nordic Optical Telescope, 5% of the observing time at NOT will be offered for...

  • Observing time
    International Time Programme

    About 5% of the observing time in all telescopes of Roque de Los Muchachos Observatory and STELLA Robotic telescopes is also offered for International Time...

  • Observing time
    Night time CAT

    The night “Comisión de Asignación de Tiempos” (CAT) evaluates the observing proposals that guarantee to the Spanish community access to the majority of the...

  • Observing time
    Observing Time Through consortia and special agreements

    Access to some telescopes is granted though specific agreements between the IAC and external institutions or consortia. The data are available to the IAC...