Table 3
1σ astrometric error budget (in mas) for the HR 8799 planets for both observations (see text).
| Error source | Error | b | c | d | e |
|
|
|||||
| Star center | 0.25 pix | 5 | 5 | 5 | 5 |
| Platescale | 0.1% | 2 | 1 | 1 | 1 |
| True north | 0.076° | 2 | 1 | 1 | 1 |
| Distortion | 0.1% | 2 | 1 | 1 | 1 |
| Fitting | 5/6 | 3/3 | 5/4 | 11/7 | |
Notes. The error sources are the determination of the star center, the camera platescale, the orientation of the true north after derotation of the images, the solution used for the modeling of the distortion effects, and the photometric biases induced by the PCA. We give the fitting error in both horizontal and vertical directions for each observation (Sect. 2).
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