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Photometric Calibration

Here is a table of current photometric zeropoints:


Filter Wavelength Bandwidth Zeropoint Background
  microns microns mag ADU/s/pix
Jc 1.25 0.25 24.9 50
Hc 1.65 0.30 24.7 300
Ks 2.16 0.33 24.3 700

Where zeropoint magnitude corresponds to 2.5 log (ADU/sec) from a 0th magnitude star and the quoted sky backgrounds for J, H, and Ks correspond to 16.1, 14, and 12.6 mag per square arcsecond. These measurements are from April 2004 and the background count rates will vary with time and season (particularly in the Ks filter).

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