Table 4
Compilation of astrometric measurements for the HD 160934 system.
| Relative positions of HD 160934 A − HD 160934 c | ||||
| Epoch | Instrument | Δα (mas) | Δδ (mas) | Reference |
|
|
||||
| 1998.496 | HST/NICMOS (IR) | 154.3 ± 0.9 | −14.8 ± 0.5 | (1) |
| 2005.296 | Gemini (IR) | 212.9 ± 2.0 | 5.6 ± 2.6 | (2) |
| 2006.518 | AstraLux (IR) | 214.9 ± 1.0 | −3.4 ± 1.0 | (1) |
| 2006.712 | Gemini (IR) | 217.9 ± 2.0 | −4.9 ± 2.6 | (2) |
| 2008.477 | Palomar (IR) | −169.1 ± 0.3 | −9.7 ± 0.3 | (3) |
| 2010.318 | Keck (IR) | 64.6 ± 0.3 | −18.9 ± 0.3 | (3) |
| 2011.310 | Keck (IR) | −6.3 ± 0.3 | −18.9 ± 0.3 | (3) |
| 2012.830 | EVN (radio) | −22.3 ± 0.1 | 6.2 ± 0.2 | (4) |
| 2014.175 | EVN (radio) | 149.3 ± 0.1 | 12.9 ± 0.2 | (4) |
| 2015.887 | AstraLux (IR) | 225.7 ± 3.0 | 11.8 ± 3.0 | (4) |
|
|
||||
| Absolute positions of HD 160934 (EVN) | ||||
| Epoch | Component | RA (h m s) | Dec (° ′ ′′) | |
|
|
||||
| 2012.830 | A | 17 38 39.59830 ± 0.00014 | 61 14 16.6077 ± 0.0005 | (4) |
| c | 17 38 39.60138 ± 0.00014 | 61 14 16.6015 ± 0.0005 | (4) | |
| 2013.392 | A | 17 38 39.60667 ± 0.00016 | 61 14 16.6865 ± 0.0007 | (4) |
| 2014.175 | A | 17 38 39.61159 ± 0.00013 | 61 14 16.6882 ± 0.0005 | (4) |
| c | 17 38 39.59090 ± 0.00013 | 61 14 16.6753 ± 0.0005 | (4) | |
Notes. (1) Hormuth et al. (2007); (2) Lafrenière et al. (2007); (3) Evans et al. (2012); (4) this work. The standard deviation of the relative position corresponds to the S/N-based uncertainty of the peaks of brightness of HD 160934 A and c. The absolute positions were obtained with reference to the IERS coordinate of the external quasar J1746+6226 (
). The standard deviation of the absolute position includes, in addition to the uncertainty of the peak of brightness, the contribution of the propagation media and the reference source structure.
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