twilight flatfielding and gain correction reduces the chip-to-chip zeropoint difference to less than /-2%

1
twilight flatfielding and gain correction reduces
the chip-to-chip zeropoint difference to less
than /-2
2
calibration with 2mass and calibration with 10
UKIRT FS agree to few percent (something going on
at H)
3
there is no colour term between the UFTI and
WFCAM filter systems as measured for the UKIRT FS
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Extinction measured on 2 nights
20050418
20050408
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(No Transcript)
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WFCAM-2mass for 1 night
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Predicted photometric variation across one
detector from the plate-scale distortion (with
fit)
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Measured photometric variation across one
detector WRT 2MASS (lollipops) with fit (contours)
9
Calibrating the Z (dark blue plus) and Y (aqua
diamond) filters