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Table 2
Locations (in arcsecond) of the five features SE5–SE1 (A–E) for each epoch as measured with the procedure described in Sect. 3.2.
| Epoch | Instrument | Feature SE5 (A) | Feature SE4 (B) | Feature SE3 (C) | feature SE2 (D) | Feature SE1 (E) |
|---|---|---|---|---|---|---|
| Apr. 2004 | HST/ACS | – | – | 1.740 ± 0.049″ | 2.446 ± 0.037″ | 3.599 ± 0.196″ |
| Jul. 2004 | HST/ACS | – | – | 1.874 ± 0.147″ | 2.564 ± 0.061″ | 3.712 ± 0.429″ |
| Aug. 2010 | HST/STIS | – | 1.268 ± 0.037″ | 2.470 ± 0.037″ | 3.359 ± 0.012″ | 4.573 ± 0.086″ |
| Jul. 2011 | HST/STIS | 0.747 ± 0.025″ | 1.390 ± 0.012″ | 2.583 ± 0.061″ | 3.497 ± 0.037″ | 4.871 ± 0.086″ |
| Aug. 2014 | SPHERE/IRDIS | 1.017 ± 0.025″ | 1.697 ± 0.012″ | 2.942 ± 0.012″ | 4.085 ± 0.037″ | 5.557 ± 0.073″ |
| May 2015 | SPHERE/IRDIS | 1.094 ± 0.049″ | 1.758 ± 0.037″ | 2.954 ± 0.025″ | 4.240 ± 0.025″ | – |
| Oct. 2015 | SPHERE/IRDIS | 1.105 ± 0.012″ | 1.772 ± 0.025″ | 3.056 ± 0.037″ | 4.198 ± 0.123″ | – |
| Jun 2016 | SPHERE/IRDIS | 1.219 ± 0.012″ | 1.891 ± 0.074″ | 3.217 ± 0.025″ | 4.294 ± 0.037″ | 6.105 ± 0.208″ |
| May 2017 | SPHERE/IRDIS | 1.335 ± 0.025′′ | 1.889 ± 0.061′′ | – | 4.253 ± 0.025′′ | – |
| Oct. 2017 | SPHERE/IRDIS | 1.360 ± 0.025′′ | 1.925 ± 0.061′′ | – | 4.271 ± 0.012′′ | – |
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