Table 4
Astrometry of the targeted multiple-star systems as extracted from our SPHERE/IRDIS observations as well as archival data taken with SPHERE, NACO, and HST.
| Object | Epoch (MJD) | Sep (mas) | PA (deg) | Ref. |
|---|---|---|---|---|
| CHX 22 | 49470 | 270 ± 30 | 236 ± 5 | 2 |
| 53820.36777 | 246.9 ± 3.3 | 246.743 ± 1.245 | 2 | |
| 54233.98285 | 245.5 ± 3.6 | 247.312 ± 1.338 | 2 | |
| 54515.19528 | 244.0 ± 3.7 | 247.635 ± 1.401 | 2 | |
| 54882.37337 | 241.9 ± 3.9 | 247.991 ± 1.483 | 2 | |
| 58898.24507 | 212.6 ± 3.4 | 252.706 ± 0.944 | 1 | |
| 58908.16592 | 213.4 ± 2.0 | 252.506 ± 0.559 | 1 | |
| S CrA | 51230.96126 | 1329.1 ± 3.3 | 150.071 ± 0.142 | 1 |
| 52576.05926 | 1322.8 ± 9.8 | 150.915 ± 0.417 | 1 | |
| 55416.21256 | 1312.6 ± 12.8 | 152.057 ± 0.571 | 1 | |
| 56087.38416 | 1313.9 ± 3.7 | 152.347 ± 0.155 | 1 | |
| 57198.31135 | 1316.8 ± 1.5 | 152.877 ± 0.112 | 1 (†) | |
| 57215.40732 | 1309.3 ± 1.3 | 153.021 ± 0.059 | 4 | |
| 59466.04295 | 1304.9 ± 1.3 | 153.979 ± 0.140 | 1 | |
| HP Cha A(BC) | 49476 | 2500 ± 500 | 284± 5 | 3 |
| 52690.20849 | 2430±2 | 285.1 ± 0.5 | 3 | |
| 53819.41198 | 2421.5 ± 32.9 | 285.077 ± 1.244 | 3 | |
| 54516.39621 | 2429.2 ± 36.9 | 285.103 ± 1.401 | 3 | |
| 54882.40637 | 2425.7 ± 38.8 | 285.084± 1.482 | 3 | |
| 58861.32325 | 2432.5 ± 3.3 | 284.417 ± 0.156 | 1 | |
| HP Cha B(C) | 53819.41198 | 70.2 ± 10.9 | 94.834± 2.801 | 3 |
| 54882.40637 | 98.4 ± 1.6 | 87.322 ± 1.497 | 3 | |
| 58861.32325 | 179.2 ± 4.4 | 83.841 ± 1.374 | 1 |
Notes. (†)This epoch was excluded from the orbit fitting as it showed significant deviation from the well-constrained orbital motion (see Fig. 4). This is likely attributed to the inaccurate calibration of the pixel scale for SPHERE observations at the Ks -band.
References. (1) This work, (2) Vogt et al. (2012), (3) Schmidt et al. (2013), (4) Sullivan et al. (2019).
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