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Table 3.
Average photometric uncertainties corresponding to different magnitudes in the V, I, and Hα bands.
| Magnitude | σV | σI | σHα |
|---|---|---|---|
| 12.0 | − | 0.001 | − |
| 12.5 | − | 0.001 | 0.004 |
| 13.0 | 0.001 | 0.000 | 0.004 |
| 13.5 | 0.002 | 0.002 | 0.003 |
| 14.0 | 0.003 | 0.003 | 0.004 |
| 14.5 | 0.003 | 0.004 | 0.005 |
| 15.0 | 0.004 | 0.005 | 0.005 |
| 15.5 | 0.005 | 0.006 | 0.006 |
| 16.0 | 0.006 | 0.007 | 0.008 |
| 16.5 | 0.008 | 0.009 | 0.010 |
| 17.0 | 0.010 | 0.012 | 0.012 |
| 17.5 | 0.013 | 0.015 | 0.015 |
| 18.0 | 0.001 | 0.001 | 0.019 |
| 18.5 | 0.001 | 0.001 | 0.024 |
| 19.0 | 0.001 | 0.001 | 0.031 |
| 19.5 | 0.001 | 0.001 | 0.040 |
| 20.0 | 0.002 | 0.002 | 0.052 |
| 20.5 | 0.002 | 0.002 | 0.068 |
| 21.0 | 0.003 | 0.003 | 0.092 |
| 21.5 | 0.003 | 0.004 | 0.128 |
| 22.0 | 0.004 | 0.004 | 0.182 |
| 22.5 | 0.005 | 0.006 | 0.264 |
| 23.0 | 0.006 | 0.007 | 0.379 |
| 23.5 | 0.008 | 0.009 | 0.567 |
| 24.0 | 0.010 | 0.011 | 0.865 |
| 24.5 | 0.013 | 0.014 | − |
| 25.0 | 0.016 | 0.018 | − |
| 25.5 | 0.020 | 0.021 | − |
| 26.0 | 0.026 | 0.025 | − |
| 26.5 | 0.032 | − | − |
| 27.0 | 0.038 | − | − |
| 27.5 | 0.047 | − | − |
| 28.0 | 0.058 | − | − |
Notes. In the V and I bands the uncertainty increases slightly for objects brighter than magnitude 18, due to the short exposures used to study these stars.
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