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 3

Case 1 orbit fitting summary.

Parameter	True	MAP	Median
M (10⁹ (M_⊙))	0.400	0.528 (32.0%)	${0.543}_{- 0.134}^{+ 0.355}$ $Mathematical equation: $0.543^{+0.355}_{-0.134}$$
q (-)	1.000	0.924 (7.64%)	${0.418}_{- 0.283}^{+ 0.332}$ $Mathematical equation: $0.418^{+0.332}_{-0.283}$$
a (pc)	0.0101	0.0108 (6.90%)	${0.0110}_{- 0.00081}^{+ 0.00161}$ $Mathematical equation: $0.0110^{+0.00161}_{-0.00081}$$
e (-)	0.000	0.0380	${0.085}_{- 0.053}^{+ 0.204}$ $Mathematical equation: $0.085^{+0.204}_{-0.053}$$
i (°)	0	28.8	${28.2}_{- 13.7}^{+ 17.3}$ $Mathematical equation: $28.2^{+17.3}_{-13.7}$$
ω (°)	0	314.3	${214.7}_{- 131.9}^{+ 80.7}$ $Mathematical equation: $214.7^{+80.7}_{-131.9}$$
Ω (°)	0	24.2	${179.7}_{- 144.4}^{+ 94.9}$ $Mathematical equation: $179.7^{+94.9}_{-144.4}$$
τ (-)	0	0.951	${0.331}_{- 0.232}^{+ 0.493}$ $Mathematical equation: $0.331^{+0.493}_{-0.232}$$

Notes. Error between fitted value and true parameter value given in brackets for MAP. Median provided with 68% credible interval ranges.

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