Table 1.
Orbital parameter for θ1 Ori C determined by Kraus et al. (2009), Balega et al. (2015), and in this work including GRAVITY data.
| Kraus et al. (2009) | Balega et al. (2015) | This work | |
|---|---|---|---|
| a (mas) | 43.61 ± 3 | 45 ± 3 | 45 ± 2 |
| P (yr) | 11.26 ± 0.5 | 11.28 ± 0.02 | 11.4 ± 0.2 |
| e | 0.592 ± 0.07 | 0.59 ± 0.01 | 0.59 ± 0.04 |
| τ | 2002.57 ± 0.5 | 2002.59 ± 0.02 | 2002.2 ± 0.2 |
| Ω (°) | 26.5 ± 1.7 | 28.3 ± 0.3 | 27.9 ± 0.7 |
| ω (°) | 285.8 ± 8.5 | 286.1 ± 0.2 | 283 ± 2 |
| i (°) | 99.0 ± 2.6 | 98.9 ± 0.4 | 98.6 ± 0.6 |
Notes.a is the semi-major axis in mas (44 mas = 18.2 ± 0.3 AU), P the period in years, e the eccentricity, τ the time of the periastron passage, Ω the longitude of the ascending node, ω the argument of periapsis, and i the inclination of the orbit. The results of Kraus et al. (2009) and this work agree within the error bars. The results of Balega et al. (2015) differ in τ and ω with this work.
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