Table 2
Astrometric measurements of the HR 8799 planets with respect to the star at epoch 2013.81.
| Planet | ΔRA (′′) | ΔDec (′′) | Separation (′′) | Parallactic angle (°) |
|
|
||||
| b | 1.5624 ± 0.0085 | 0.7133 ± 0.0130 | 1.7176 ± 0.0131 | 65.46 ± 0.44 |
| c | −0.5383 ± 0.0060 | 0.7838 ± 0.0131 | 0.9508 ± 0.0142 | 325.52 ± 0.87 |
| d | −0.3771 ± 0.0070 | −0.5380 ± 0.0111 | 0.6571 ± 0.0134 | 215.0 ± 1.2 |
| e | −0.3938 ± 0.0105 | −0.0357 ± 0.0168 | 0.3954 ± 0.0119 | 264.8 ± 1.7 |
Notes. The values of ΔRA and ΔDec are the averages of two measurements (see text). The error for ΔRA is the average of the statistical errors associated to the individual measurements. The error for ΔDec is estimated using the quadratic combination of the statistical errors associated to the individual measurements and of the bias between the individual measurements. The statistical error of an individual measurement is derived using the quadratic combination of the error terms detailed in Table 3.
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