Table 2
SPHERE astrometry relative to the star of 51 Eridani b.
| Epoch | Filter | ρ | PA | ΔRA | ΔDec | Pixel scale | North correction angle |
|---|---|---|---|---|---|---|---|
| (mas) | (°) | (mas) | (mas) | (mas pix−1) | (°) | ||
| 2015.74 | K1 | 453.4 ± 4.6 | 167.15 ± 0.56 | 100.8 ± 2.9 | −442.0 ± 3.6 | 12.267 ± 0.009 | −1.813 ± 0.046 |
| 2015.74 | H | 453.9 ± 16.3 | 166.1 ± 2.0 | 108.7 ± 8.8 | −440.7 ± 13.7 | 12.251 ± 0.009 | −1.813 ± 0.046 |
| 2016.04 | H2 | 456.7 ± 6.9 | 165.50 ± 0.84 | 114.3 ± 4.5 | −442.2 ± 5.2 | 12.255 ± 0.009 | −1.82 ± 0.06 |
| 2016.95 | H2 | 453.6 ± 5.7 | 160.30 ± 0.72 | 152.9 ± 3.4 | −427.1 ± 4.6 | 12.255 ± 0.009 | −1.808 ± 0.043 |
| 2017.74 | K1 | 449.0 ± 2.9 | 155.67 ± 0.38 | 185.0 ± 2.0 | −409.2 ± 2.1 | 12.267 ± 0.009 | −1.735 ± 0.043 |
| 2018.72 | K1 | 443.3 ± 4.2 | 150.23 ± 0.55 | 220.2 ± 2.8 | −384.8 ± 3.1 | 12.267 ± 0.009 | −1.796 ± 0.068 |
Notes. The astrometric error bars were derived assuming an error budget including the measurement uncertainties (image post-processing) and the systematic uncertainties (calibration). The uncertainties in the estimation of the star location for the sequences obtained without the stellar replicas in the science images were estimated using calibration data taken before and after the science images (see text). The values are 0.32, 7.87, and 2.02 mas for the 2015 September 25, 2015 September 26, and January 2016 datasets, respectively.
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