The Pilot Survey was initially assigned 7 nights during period
62. Then, due to delays in making the WFI operational, it was decided
to include the Pilot Survey observations in the commissioning run of the
WFI in January 1999. The Pilot Survey was assigned 3 hours per night in
the period Jan 6 to Jan 18 1999. During
this run 3/4 of Patch C and all of Patch D were observed in the B-band.
In period 63, 7 nights were
allocated to the Pilot Survey and they were divided between 4 runs: 2 in
April, 1 in May and 1 in September. In period 64, 17 hrs have been allocated
in Service Mode. They completed Patch C and D in the B-band and fully covered
patch D in the V-band (this filter was only available after March 1999).
During bright time in the first run in April, half of patch D was observed
with the 913nm medium band filter. This observing time was supposed to
be used to cover the same patch with the WFI Z filter but it was unavailable
at the time. In addition the 913nm filter is expected to be valuable for
determining photometric redshifts.
In the following table, actual coverage of each patch is shown according
to different filters. The numbers in red refer
to the area covered by the WFI.