Table I.1
Relative astrometry for the targets with both the star and the companion in the FOV of ERIS/SPIFFIER.
| Target | Time (JD) [d] | Pixel size [mas] | ΔαM [mas] | ΔδM [mas] | ΔαR [mas] | ΔδR [mas] | σα [px] | σδ [px] | Ref. |
|---|---|---|---|---|---|---|---|---|---|
| HR 8799 e | 2460233.618 | 12.5 | −211.0 ± 12.5 | 335.2 ± 12.5 | −225.0 ± 0.2 | 331.2 ± 0.3 | 1.1 | 0.3 | [1] |
| 2MJ0219 b | 2460256.605 | 125 | 13.3 ± 125 | −3807.2 ± 125 | |||||
| AF Lep b | 2460256.729 | 12.5 | 300.5 ± 12.5 | 59.1 ± 12.5 | 316.74 ± 0.04 | 62.49 ± 0.05 | −1.3 | −0.3 | [2] |
| ROXs 42 B b | 2460354.886 | 50 | −1172.8 ± 50 | 103.5 ± 50 | −1166 ± 5 | 36 ± 7 | −0.1 | 1.3 | [3] |
| CT Cha b | 2460355.688 | 50 | −2211.4 ± 50 | 1465.4 ± 50 | |||||
| ROXs 12 b | 2460355.892 | 50 | 309.1 ± 50 | 1786.0 ± 50 | 264 ± 9 | 1781 ± 3 | 0.9 | 0.1 | [3] |
| 1RXSJ1609 b | 2460356.899 | 50 | 1060.2 ± 50 | 1939.8 ± 50 | 1003 ± 4 | 1981 ± 2 | 1.1 | −0.8 | [4] |
Notes. The pixel size refers to the on-sky size of a spatial pixel (spaxel) in the reduced datacube. The symbols Δα and Δδ denote the right ascension and declination of the companion relative to the host star. The subscript M denotes the measured values from this work, whilst R indicates the predicted astrometry based on orbital fits provided in the references. The error between our measured values and the reference values are given by σα and σδ and are indicated in units of pixel. References: [1] GRAVITY (from whereistheplanet.com, unpublished), [2] Balmer et al. (2025a), [3] Bryan et al. (2016), [4] Keck (from whereistheplanet.com, unpublished).
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