About NRAO > Performance Metrics > All Observing Hours

All Observing Hours

by Davis Murphy last modified Feb 06, 2017

All Observing Hours = Actual hours of time in all categories: Scheduled, Maintenance, Test, Unscheduled, or Shutdown.

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  • Scheduled: Planned hours of observing time for peer-reviewed science proposals.
    • Scheduled = [ Astronomy + Downtime ]
  • Astronomy: Actual hours of VLA and ALMA observing time for peer-reviewed science proposals.
  • Downtime: Hours lost during scheduled observing time for peer-reviewed science proposals.
  • Maintenance: Actual hours of scheduled service of infrastructure, structure, electronics, and software.
  • Test: Actual hours of test observations rather than peer-reviewed science proposals.
  • Unscheduled: Actual idle hours owing to gaps between observing programs that cannot be scheduled and to extended inclement weather.
  • Shutdown: Actual shutdown hours, usually for a holiday or major equipment work.