Towards direct imaging and orbital parameter estimation of supermassive black hole binaries with spaceborne VLBI

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Volume 711 (July 2026)

A&A, 711 (2026) A293

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Table C.5

Case 5 orbit fitting summary.

Parameter	True	MAP	Median
M [10⁹ (M_⊙)]	5.62	1.296 (76.9%)	${1.342}_{- 0.196}^{+ 24.87}$ $Mathematical equation: $1.342^{+24.87}_{-0.196}$$
q [-]	0.600	0.935 (55.8%)	${0.475}_{- 0.354}^{+ 0.425}$ $Mathematical equation: $0.475^{+0.425}_{-0.354}$$
a [pc]	0.0138	0.0145 (4.9%)	${0.0146}_{- 0.0005}^{+ 0.0036}$ $Mathematical equation: $0.0146^{+0.0036}_{-0.0005}$$
e [-]	0.000	0.031	${0.0779}_{- 0.0588}^{+ 0.299}$ $Mathematical equation: $0.0779^{+0.299}_{-0.0588}$$
i [°]	0	25.5	${24.7}_{- 13.2}^{+ 96.2}$ $Mathematical equation: $24.7^{+96.2}_{-13.2}$$
ω [°]	0	295.9	${225.4}_{- 167.1}^{+ 73.1}$ $Mathematical equation: $225.4^{+73.1}_{-167.1}$$
Ω [°]	0	24.0	${176.6}_{- 153.7}^{+ 105.4}$ $Mathematical equation: $176.6^{+105.4}_{-153.7}$$
τ [-]	0	0.901	${0.797}_{- 0.660}^{+ 0.109}$ $Mathematical equation: $0.797^{+0.109}_{-0.660}$$

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