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.4

Case 4 orbit fitting summary.

Parameter	True	MAP	Median
M [10⁹ (M_⊙)]	1.734	2.156 (24.3%)	${6.904}_{- 5.085}^{+ 4.996}$ $Mathematical equation: $6.904^{{+4.996}}_{{-5.085}}$$
q [-]	0.600	0.131 (78.2%)	${0.722}_{- 0.526}^{+ 0.146}$ $Mathematical equation: $0.722^{{+0.146}}_{{-0.526}}$$
a [pc]	0.0152	0.0159 (4.85%)	${0.0167}_{- 0.00339}^{+ 0.00458}$ $Mathematical equation: $0.0167^{{+0.00458}}_{{-0.00339}}$$
e [-]	0.000	0.00111	${0.276}_{- 0.177}^{+ 0.138}$ $Mathematical equation: $0.276^{{+0.138}}_{{-0.177}}$$
i [°]	0.000	25.7	${37.9}_{- 24.7}^{+ 51.9}$ $Mathematical equation: $37.9^{{+51.9}}_{{-24.7}}$$
ω [°]	0.000	342.3	${161.7}_{- 102.3}^{+ 146.5}$ $Mathematical equation: $161.7^{{+146.5}}_{{-102.3}}$$
Ω [°]	0.000	35.1	${176.1}_{- 120.7}^{+ 86.4}$ $Mathematical equation: $176.1^{{+86.4}}_{{-120.7}}$$
τ [-]	0.000	0.0492	${0.623}_{- 0.453}^{+ 0.248}$ $Mathematical equation: $0.623^{{+0.248}}_{{-0.453}}$$

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