Table A.1
Relative position angle θ and separation ρ of α Cen A and B since 1980.
| Epoch | θ [°] | ρ [″] | Ref./Inst.a |
|
|
|||
| 2016.1893 | 305.19 ± 0.30 | 4.013 ± 0.02 | NACO |
| 2015.3326 | 293.30 ± 0.60 | 4.020 ± 0.04 | ALMA B8 |
| 2014.9574 | 288.28 ± 0.70 | 4.081 ± 0.05 | ALMA B6 |
| 2014.5426 | 282.91 ± 0.15 | 4.208 ± 0.01 | ALMA B9 b |
| 2014.5126 | 282.84 ± 0.30 | 4.184 ± 0.02 | ALMA B7 |
| 2014.2410 | 279.20 ± 0.30 | 4.330 ± 0.05 | An15 |
| 2012.7100 | 262.70 ± 0.40 | 5.050 ± 0.05 | An14 |
| 2009.7140 | 244.20 ± 0.40 | 7.020 ± 0.05 | An12 |
| 2009.1517 | 241.07 ± 0.60 | 7.400 ± 0.07 | SOFI |
| 2008.7190 | 239.80 ± 0.40 | 7.780 ± 0.05 | An11 |
| 2007.3670 | 235.70 ± 0.60 | 8.780 ± 0.10 | An08 |
| 2004.2739 | 228.26 ± 0.20 | 11.122 ± 0.02 | NACO |
| 2002.6880 | 224.30 ± 1.00 | 12.500 ± 0.40 | An06 |
| 2000.7400 | 223.80 ± 1.00 | 13.300 ± 0.40 | WDS |
| 2000.1950 | 222.63 ± 0.80 | 13.933 ± 0.20 | 2MASS |
| 1991.2500 | 215.29 ± 0.15 | 19.073 ± 0.05 | Hip |
| 1989.5370 | 214.68 ± 0.16 | 19.740 ± 0.05 | J94 |
| 1988.2880 | 213.75 ± 0.15 | 20.180 ± 0.05 | J94 |
| 1987.2900 | 213.21 ± 0.15 | 20.540 ± 0.05 | J94 |
| 1986.5090 | 212.77 ± 0.15 | 20.784 ± 0.05 | P91 |
| 1985.6030 | 212.08 ± 0.15 | 21.087 ± 0.05 | P91 |
| 1984.4250 | 211.54 ± 0.14 | 21.385 ± 0.05 | P91 |
| 1982.4900 | 210.60 ± 0.40 | 21.910 ± 0.13 | T85 |
| 1980.4000 | 210.50 ± 1.00 | 21.710 ± 0.50 | F86 |
| 1980.2870 | 210.04 ± 0.06 | 21.614 ± 0.05 | J95 |
Notes.
The ALMA band 9 measurement is taken as the fiducial of our orbit determination (Sect. 3.1).
Reference. An06: Anton (2006); An08: Anton (2008); An11: Anton (2011); An12: Anton (2012); An14: Anton (2014); An15: Anton (2015); F86: Frangetto (1986); Hip: ESA (1997); J94: Jasinta & Soegiartini (1994); P91: Panjaitan & Herdiwijaya (1991); T85: Torres (1985); WDS: Mason et al. (2001).
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