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Science Operations Statistics: RA distributions

The figures on this page summarize the RA distributions for planned and executed queue programs during semesters 2006B-2008B at Gemini North and South. Only science observations are included in the distributions of planned and executed observations. The distributions show the number of hours worth of observations at each RA. Programs that were withdrawn have been excluded from the distributions. Template observations for ToO (Target of Opportunity) programs are not included as these in general contain no RA information.

On each figure the approximate available time (number of hours) is shown. This is the absolute maximum number of hours that can be executed, without any loss to weather or technical problems, and no time for calibrations or engineering on the sky. The sum of the average weather loss, technical loss and engineering time accounts for around 40% of the total time - see figure 1 on the main statistics page for details. While the science observations typically can be executed within an hour angle of +- 3hours, it is quite clear that in some cases the planned observations cannot realistically be executed within the available time. This is particularly the case for GN2006B-2008B at RA=12-14h. This RA range includes both the North Galactic Pole and the HDF-N.

PIs with programs in band 3 and with flexibility in target selection are encouraged to use the information in these figures for selection of alternative targets at RAs in less demand from band 1 and 2. As for all target change requests, these need to be submitted for approval to the local Head of Science Operations, see the change request page for details.

Available figures:




Figure 1: RA distributions of planned and executed science observations for GN2006B-2008B. Note the concentration around RA=12-14h, corresponding to the North Galactic Pole.


Figure 2: RA distributions of planned and executed science observations for GS2006B-2008B.


Last update: March 22, 2012 by Michael Hoenig