Table 4
Astrometric displacement of the center-of-light (CL) of δ Vel A.
| UT date | MJD | φ | Model A-B | Model CL | Observ. CL | Nσ |
| –54 000 | vector | displacement | displacement | |||
|
|
||||||
| 2008 Apr. 01 | 557.0224 | 0.9294 | −430.397,457.959 | + 0.195, − 0.390 | −0.173± 0.039, −0.140± 0.043 | 10 |
| 2008 Apr. 04 | 560.9976 | 0.0175 | −430.355,456.900 | −0.117, + 0.278 | −0.314± 0.043, +0.170± 0.055 | 4 |
| 2008 Apr. 06 | 562.0121 | 0.0400 | −430.344,456.630 | −0.191, + 0.434 | −0.484± 0.028, +0.416± 0.037 | 8 |
| 2008 Apr. 07 | 563.0048 | 0.0619 | −430.334,456.365 | −0.255, + 0.566 | −0.390± 0.028, +0.610± 0.038 | 4 |
| 2008 Apr. 20 | 576.9715 | 0.3713 | −430.183,452.639 | −0.117, + 0.201 | −0.084± 0.035, +0.226± 0.039 | 1 |
| 2008 Apr. 23 | 579.0231 | 0.4167 | −430.160,452.091 | −0.051, − 0.009 | −0.196± 0.030, −0.117± 0.033 | 8 |
| 2008 Apr. 24 | 580.9917 | 0.4603 | −430.139,451.565 | + 0.070, − 0.201 | + 0.349± 0.042, −0.475± 0.056 | 7 |
| 2008 May 05 | 591.9748 | 0.7036 | −430.015,448.627 | + 0.449, − 0.984 | + 1.127± 0.046, +0.087± 0.042 | 28 |
| 2008 May 07 | 593.9732 | 0.7478 | −429.992,448.093 | + 0.464, − 1.006 | + 0.758± 0.036, −0.134± 0.033 | 26 |
| 2008 May 18 | 604.0442 | 0.9709 | −429.876,445.399 | + 0.052, − 0.082 | −0.272± 0.055, +0.039± 0.051 | 5 |
Notes.“Model A-B vector” is the predicted astrometric separation ([αB − αA] , [δB − δA]) of the centers of light of A and B (with a shift of Δα = −0.3 mas, see Sect. 3). The shift of the center of light of Aab relative to its center of mass is listed in the column “Model CL displacement”. The observed Aab center of light displacement (“Observ. CL displacement”) and the distance between the observed positions and the model positions in number of standard deviations (Nσ) are also listed. All angular values are expressed in milliarcseconds.
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