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SkyMapper Main Survey

Most of SkyMapper's observing time is now dedicated to the Main Survey. This has an expected depth (in AB mags) for a signal-to-noise ratio of 5 in 2.5" seeing, of:

 uvgriz
Single epoch 19.5 19.5 21.0 21.0 20.0 19.0
Saturation 10.0 10.5 13.0 13.0 11.0 10.5
Exp. time (s) 100 100 100 100 100 100
Final depth 20.5 20.5 21.7 21.7 20.7 19.7
 
The survey scheduler aims to finish a field mostly within one moon period. A first visit in dark conditions establishes a colour sequence with all six bands observed in the space of 20 minutes. Further visits in subsequent nights under dark or grey sky conditions add exposure pairs in g- and r-band, while in grey or bright conditions pairs in i- and z-band are added. A second colour sequence in dark conditions finishes the set. Further pairs in i- and z-band are also observed during astronomical twilight. These twilight observations may be separated by many months from the night-time visits.

Progress & Statistics

Survey Progress

Survey FWHM Statistics

Survey Completion Map

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