Table 5
The transformed positions of the adopted corners to the reference chips (see Fig. 1).
| Date | Corner Method | 3 | 4 | 13 | 15 | ||||
|---|---|---|---|---|---|---|---|---|---|
| Mean | σ | Mean | σ | Mean | σ | Mean | σ | ||
| 2016 | GDI | (-7.409,4174.955) | (0.020,0.043) | (4087.713,4174.804) | (0.015,0.059) | (4465.584,4050.774) | (0.031,0.043) | (4474.233,19.740) | (0.022,0.060) |
| GD2 | (-7.400,4174.983) | (0.027,0.042) | (4087.696,4174.942) | (0.018,0.029) | (4465.591,4050.840) | (0.026,0.032) | (4474.262,19.664) | (0.034,0.021) | |
| 2017 | GD1 | (-8.668,4173.269) | (0.028,0.034) | (4086.377,4174.928) | (0.028,0.044) | (4462.119,4054.050) | (0.023,0.031) | (4468.875,23.009) | (0.035,0.025) |
| GD2 | (-8.730,4173.295) | (0.031,0.055) | (4086.362,4174.791) | (0.029,0.046) | (4462.143,4053.977) | (0.038,0.050) | (4468.928,23.057) | (0.066,0.065) | |
| Date | Corner Method | 2 | 4 | 13 | 14 | ||||
|---|---|---|---|---|---|---|---|---|---|
| Mean | σ | Mean | σ | Mean | σ | Mean | σ | ||
| 2016 | GD1 | (-365.724,4010.315) | (0.022,0.058) | (-362.840,-20.635) | (0.020,0.040) | (15.129,-144.431) | (0.011,0.032) | (4110.078,-132.512) | (0.018,0.037) |
| GD2 | (-365.835,4010.479) | (0.023,0.039) | (-362.864,-20.706) | (0.021,0.031) | (15.108,-144.558) | (0.020,0.035) | (4110.114,-132.581) | (0.023,0.029) | |
| 2017 | GD1 | (-364.492,4010.520) | (0.036,0.032) | (-362.200,-20.438) | (0.031,0.025) | (13.533,-141.278) | (0.019,0.031) | (4108.507,-133.841) | (0.028,0.050) |
| GD2 | (-364.520,4010.478) | (0.026,0.029) | (-362.197,-20.513) | (0.050,0.043) | (13.560,-141.323) | (0.034,0.047) | (4108.603,-133.934) | (0.035,0.068) | |
Notes. GD1 means the results of photographic astrometry and GD2 means the results of differential astrometry. Columns 3 to 10 show the mean pixel positions and their corresponding precisions. The top table shows the results taking CCD#2 as the reference and the bottom table shows the results taking CCD#3 as the reference. The averages of the differences between the results of photographic astrometry and differential astrometry are about 0.018 pixels (~0.008 arcsec) for Obs16 and about 0.026 pixels (~0.012 arcsec) for Obs17 respectively. And the average precisions are about 0.049 pixels (~0.022 arcsec) for Obs16 and about 0.056 pixels (~0.025 arcsec) for Obs17 respectively. All units are in pixels.
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