Table 2.

Campbell orbital elements of the Gaia BH3 system and the astrometric parameters of its barycentre.

Parameter Astrometric Combined
solution solution
α [deg] 294.8278502411 (a) 294.8278502301 (a)
σα* [mas] 0.060 0.054
δ [deg] 14.9309190720 (a) 14.9309190869 (a)
σδ [mas] 0.086 0.074
ϖ [mas] 1.6747 ± 0.0094 1.6933 ± 0.0164 (b)
μ α * $ \mu^*_\alpha $ [mas yr−1] −28.372 ± 0.077 −28.317 ± 0.067
μδ [mas yr−1] −155.150 ± 0.129 −155.221 ± 0.111
P [days] 4194.7 ± 112.3 4253.1 ± 98.5
e 0.7262 ± 0.0056 0.7291 ± 0.0048
a0 [mas] 27.07 ± 0.56 27.39 ± 0.49
i [deg] 110.659 ± 0.107 110.580 ± 0.095
Tp [JD, TCB] 2458177.28 ± 0.98 2458177.39 ± 0.88
Ω [deg] 136.200 ± 0.147 136.236 ± 0.128
ω [deg] 77.77 ± 0.66 77.34 ± 0.76
a1 [AU] ... 16.17 ± 0.27
γ [ km s−1] ... −357.31 ± 0.44
fM [ M] 32.03 ± 0.64 31.23 ± 0.81
GoF 2.17 −0.53

Notes.

(a)

The reference epoch of DR4 coordinates is J2017.5 (JD 2457936.875).

(b)

Derived as a0/a1, see text.

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