| Level 1 Requirement | Achieved | |
| Sky Coverage (VI.2) | ≥4 independent exposures in each filter over at least 95% of the sky. | ≥4 coverages on 99.9%/99.8%/99.3%/99.5% of the sky at W1/W2/W3/W4 |
| Photometric Sensitivity (VI.3.a) | SNR≥5 at 0.12/0.16/0.85/4.0 mJy at W1/W2/W3/W4 where the noise is limited to flux errors due to zodiacal foreground emission, instrumental effects, source photon statistics, and unresolved extragalactic sources. | SNR=5 on 0.068/0.098/0.86/5.4 mJy at W1/W2/W3/W4 |
| Photometric Accuracy (VI.3.b) | RMS error in relative accuracy <7% for unsaturated point sources with SNR>100, where the noise is limited to flux errors due to zodiacal foreground emission, instrumental effects, source photon statistics, and neighboring sources. Does not apply to sources that are superimposed on an identified artifact. | 2.7%/2.9%/3.7%/2.4% at SNR=100 for W1/W2/W3/W4 |
| Astrometric Accuracy (VI.4) | RMS position error with respect to the 2MASS PSC <0.5" on each axis for sources with SNR>20 in at least one band, where the noise is limited to flux errors due to zodiacal foreground emission, instrumental effects, source photon statistics, and neighboring sources. Does not apply to sources that are superimposed on an identified artifact. | RMS=0.4" per axis (RA and Dec) at SNR=20 relative to the 2MASS reference frame |
| Catalog Completeness (VI.5) | At least 95% for sources with SNR>20 in at least one band, where the noise includes flux errors due to zodiacal foreground emission, instrumental effects, source photon statistics, and neighboring sources. Does not apply to sources that are superimposed on an identified artifact. | >95% for sources at SNR≥20 in regions with ≥5 frame depth-of-coverage |
| Catalog Reliability (VI.6) | >99.9% for sources detected in at least one band with SNR>20 where the noise includes flux errors due to zodiacal foreground emission, instrumental effects, source photon statistics, and neighboring sources. Does not apply to sources that are superimposed on an identified artifact. | >99.9% for SNR>16 in W1 |
Last update: 2012 March 5