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Table B.1
The different ways to determine the ascending node of the relative orbit (B/A).
| System type | Available orbit | Available velocities | Ascending node determination | Case | |
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| Spectroscopic binary | spectro-visual | from orbit | i, Ω, ω result from (B/A) orbit computation | 1 | |
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| resolved as | visual and SB2 | Vr(B), Vr(A) from orbit |  (B/A) compared to Vr(B)-Vr(A) |
2 | |
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| visual or astrometric | visual and SB1 | Vr(A) from orbit |  compared to Vr(A) |
3 | |
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| binary | astrometric and SB1 | Vr(A) from orbit | (F) compared to Vr(A) |
4 | |
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| Visual binary | visual | Vr(A) and Vr(B) | compared to Vr(B)-Vr(A)
drift |
5 | |
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| Vr(A) | compared to Vr(A)
drift |
6 | |||
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| Astrometric binary | astrometric | Vr(A) | (F) compared to Vr(A)
drift |
7 | |
Notes. In the table, the quantities denote the values
derived from the visual or astrometric elements through Eq. (B.2), the values without a tilde are
the observed values.
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