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What do the time estimates in the summary PDF page generated by the OT refer to and how are they calculated?
Posted by Suzanna Randall, Last modified by Andy Biggs on 11 March 2019 01:29 PM


The PDF proposal summary generated by the OT reports three time estimates: the total time required on the 12m Array for all configurations, the total ACA (7m Array plus total power) time, and the nonstandard mode time required on the 12m Array. Since the 12m and the ACA Array are queued for observations separately and can be observed simultaneously, the time taken into account for the proposal assessment is the 12m time. A more detailed breakdown of the times can be brought up with the 'Time Estimate' button in the Control & Performance editor on a per Science Goal basis, or viewed for the entire project by clicking on the clock icon in the OT toolbar. For most projects, the total time for a Science Goal is calculated in detail based on the requested sensitivity for the most extended configuration (either a 12m configuration or the Standalone ACA) including all pointings, tunings, calibrations and overheads. The times for any smaller arrays (e.g. a second 12m configuration or the Total Power Array) are calculated by multiplying the onsource time of the largest array by precalculated factors derived from simulations and then calculating the necessary calibration and other overheads. The total ACA time is given by the TP time if TP observations are scheduled and by the 7m Array time if not, under the premise that these arrays can be operated in parallel. Using the TP Array without the 7m Array is not allowed. For VLBI and Solar observations, a 12m Array time request (including all calibrations and overheads) is directly entered by the user into the OT rather than being computed based on a sensitivity goal. For VLBI, this is the total time including all calibration and overheads. For solar observations, the onsource time is entered and the OT calculates the expected total time based on information provided by the solar commissioning team. You can override the OT's time estimates in the Control and Performance editor. The value entered must be the total time required for the most extended 12m Array including all calibrations and overheads, and the time override must be fully justified in the Technical Justification. Time overrides apply to the most extended 12m Array; the resulting time for any more compact configurations will be computed by the OT using the factors described above.  
