Table 4
Positions of the close visual companion of θ1 Ori A.
Date | PA | ΔPA | Sep. | ΔSep. | Ref. |
[![]() |
[![]() |
[′′] | [′′] | ||
|
|||||
1994.901 | 343.5 | 5 | 208 | 30 | 3 |
1995.775 | 350.6 | 2 | 227 | 5 | 2 |
1996.247 | 352.8 | 2 | 227 | 4 | 2 |
1996.746 | 352.7 | 2 | 223 | 4 | 2 |
1997.788 | 353.0 | 2 | 224 | 4 | 2 |
1998.838 | 353.8 | 2 | 221 | 5 | 2 |
1998.841 | 353.8 | 2 | 221.5 | 5 | 4 |
1999.715 | 355.4 | 2 | 219 | 3 | 2 |
1999.737 | 354.8 | 2 | 215 | 3 | 2 |
1999.819 | 175.1* | 0.5 | 212 | 2.5 | 5 |
2000.765 | 356.2 | 2 | 215 | 4 | 2 |
2000.781 | 356.1 | 2 | 216 | 4 | 2 |
2000.781 | 356.0 | 2 | 211 | 4 | 2 |
2001.186 | 356.0 | 2 | 215 | 3 | 2 |
2001.718 | 356.9 | 1 | 205.1 | 3 | 1 |
2003.701 | 3.9 | 1 | 210 | 5 | This paper |
2003.945 | 3.9 | 1 | 209 | 5 | This paper |
2004.816 | 0.3 | 1.6 | 203 | 2 | 6 |
2004.822 | 0.9 | 0.8 | 205 | 3 | 6 |
2004.945 | 4.6 | 1 | 207 | 5 | This paper |
2005.060 | 5.3 | 1 | 208 | 5 | This paper |
2005.940 | 5.9 | 1 | 204 | 5 | This paper |
2007.704 | 6.1 | 1 | 202 | 5 | This paper |
2009.019 | 7.5 | 1 | 199 | 5 | This paper |
2009.885 | 8.2 | 1 | 197 | 5 | This paper |
2009.899 | 8.5 | 1 | 198 | 5 | This paper |
2010.260 | 9.4 | 1 | 197 | 5 | This paper |
2010.877 | 6.5 | 0.3 | 193.1 | 0.5 | 1 |
2010.953 | 6.2 | 2 | 193.0 | 1 | This paper |
2011.827 | 7.3 | 2 | 193.2 | 1 | This paper |
Notes.
180° ambiguity could not be solved from the measurement itself, but taking into account the other measurements should probably be 355.1°.
References. (1) Close et al. (2012); (2) Schertl et al. (2003); (3) Petr et al. (1998); (4) Weigelt et al. (1999); (5) Balega et al. (2004); (6) Balega et al. (2007).
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