Table 5
Orbital parameter posterior distributions for HIP 65A and HIP 65B from Gaia astrometry.
| Parameter (a) | Median | Mode | 68% Min CI (b) | 95% Min CI |
|---|---|---|---|---|
| log (a) (AU) | 2.43 | 2.42 | (2.19, 2.51) | (2.18, 2.82) |
| e | 0.31 | 0.08 | (0, 0.49) | (0, 0.67) |
| i (°) (c) | 126.4 | 125.0 | (113.6, 136.5) | (109.2, 161.9) |
| ω (°) | 178.4 | 316.2 | (119.0, 341.8) | (17.9, 360.0) |
| Ω (°) (d) | 104.4 | 90.0 | (78.6, 135.1) | (29.6, 178.4) |
| T0 (yr) | 806.6 | 1319.6 | (−383.7, 1564.9) | (−7192.1, 2013.9) |
| log[a (1 − e)] | 2.30 | 2.42 | (1.89, 2.49) | (1.73, 2.71) |
Notes. (a) Orbital parameters: semi-major axis (a), eccentricity (e), inclination (i), argument of periastron (ω), longitude of nodes (Ω), epoch of periastron passage (T0), and periastron distance [a (1 − e)]. (b) Posterior distributions are not Gaussian, so we report the 68 and 95% minimum credible intervals. (c) Inclination is defined relative to the plane of the sky, i = 90° is edge-on. (d)In the absenceof radial velocity information, there is a degeneracy between ω and Ω, so we limit Ω to be on the interval [0, 180]. If in the future radial velocity is obtained and Ω > 180°, 180° should be added to both Ω and ω.
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