Table 2
Orbital parameters for θ1 Ori B, θ1 Ori C and θ1 Ori D.
| This work | (1) | |
|---|---|---|
| θ1 Ori B | ||
| a [mas] | 12.982 ± 0.018 | – |
| e | 0.67326 ± 0.00037 | – |
| i [°] | 69.233 ± 0.063 | – |
| ω [°] | 133.48 ± 0.13 | – |
| ω [°] | 282.860 ± 0.028 | – |
| P [yr] | 3.22571 ± 0.00056 | – |
| tP [yr] | 2019.3935 ± 0.0019 | – |
| Mtot [M⊙] | 14.928 ± 0.057 | – |
| θ1 Ori C | ||
| a [mas] | 44.47 ± 0.19 | 45 ± 2 |
| e | 0.5908 ± 0.0034 | 0.59 ± 0.04 |
| i[°] | 98.702 ± 0.050 | 98.6 ± 0.6 |
| ω [°] | 283.70 ± 0.14 | 283 ± 2 |
| ω [°] | 27.516 ± 0.055 | 27.9 ± 0.7 |
| P [yr] | 11.4426 ± 0.0097 | 11.4 ± 0.2 |
| tP [yr] | 2002.304 ± 0.019 | 2002.2 ± 0.2 |
| Mtot [M⊙] | 47.70 ± 0.61 | 46.4 ± 5.9 |
| θ1 Ori D | ||
| a [mas] | 1.94 ± 0.014 | 1.86 ± 0.06 |
| e | 0.391 ± 0.011 | 0.43 ± 0.03 |
| i[°] | 155.19 ± 0.70 | 160±12 |
| ω [°] | 156.40 ± 12.03 | 166 ± 27 |
| ω [°] | 339.56 ± 9.52 | 346 ± 24 |
| P [yr] | 0.1449059 ± 0.0000086 | 0.1452 ± 0.0002 |
| tP [yr] | 2017.1004 ± 0.0015 | 2017.101 ± 0.001 |
| Mtot [M⊙] | 24.91 ± 0.54 | 21.68 ± 0.05 |
Notes. a is the semi-major axis, e the eccentricity, i the inclination, ω the argument of periastron of the secondary’s orbit, ω the longitude of ascending node, P the period, tP the time of periastron passage, and Mtot the total system mass assuming a parallax of 2.415 ± 0.040 mas (Menten et al. 2007).
References. (1) GRAVITY Collaboration (2018c).
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