Table 1.
Properties of the repository contents by filter for the better-quality image sets graded A to C.
| Filter | ING/WFC name | N | Exposure | PSF FWHM | Sky count | ZP | 5σ depth | Moon phase |
|---|---|---|---|---|---|---|---|---|
| (s) | (arcsec) | (mag.) | (mag.) | |||||
| i | WFCSloanI | 83652 | 10 (83%), and 20 (17%) | 1.06 | 92 | 26.42 | 20.28 | 0.68 |
| Hα | WFCH6568 | 83652 | 120 | 1.20 | 57 | 26.57 | 20.40 | ″ |
| rI | WFCSloanR | 83652 | 30 (85%), and 10 (15%) | 1.16 | 164 | 28.19 | 21.37 | ″ |
| rU | ″ | 67896 | 30 | 1.18 | 126 | 28.20 | 21.67 | 0.21 |
| g | WFCSloanG | 67895 | 30 | 1.26 | 61 | 28.71 | 22.38 | ″ |
| URGO | WFCRGOU | 67892 | 120 | 1.48 | 43 | 27.85 | 21.47 | ″ |
Notes. The number N specifies the number of CCD images available in the A to C grade range for each filter (D-grade images with identified problems are not included in the count). Median values are listed for the full width half maximum of the point spread function (PSF FWHM), the sky background count, zero point (ZP), 5σ detection limit in the Vega system, and moon phase. The PSF FWHM and the background count are pipeline measures, while the ZP and limiting magnitude are based on the uniform calibration (Monguió et al. 2020). Moon phase is given as a fraction, such that 0 corresponds to new moon and 1 to full moon. The rI exposure time started out at 10 s but was raised to 30 s from 2004 on, while the i exposure time was increased to 20 s starting in October 2010.
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