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Table 1
Orbital parameters and spin frequency of MAXI J0911−655 obtained from the analysis of the XMM-Newton observations of the source.
| Parameters | XMM1 | XMM2 | XMM1+XMM2 | NuSTAR |
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| RA (J2000) | 09h12m2.43s | |||
| Dec (J2000) | −64°52m6.4s | |||
| Orbital period Porb (s) | 2659.71(14) | 2659.93(7) | 2659.93312(47) | a |
| Projected semi-major axis x (lt-s) | 0.01759(2) | 0.017598(11) | 0.017595(9) | a |
| Ascending node passage TNOD (MJD) | 57 502.185183(5) | 57 530.600905(13) | 57 502.185176(10) | a |
| Eccentricity (e) | < 1.4 × 10-2 | < 4 × 10-3 | < 5 × 10-3 | a |
| Spin frequency ν0 (Hz) | 339.975071(3) | 339.9750123(3) | − | 339.974937(3) |
Spin frequency derivative  (Hz/s) |
−2.76(16) × 10-9 | − | − | −1.6(4) × 10-10 |
| Epoch of ν0 and , T0 (MJD) |
57 502.2 | 57 530.6 | 57 502.2 | 57 532.0 |
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 /d.o.f. |
141.4/86 | 85.9/108 | 178.1/196 | 22.4/9 |
Notes. Errors are at the 1σ confidence level. The reported X-ray position of the source has a pointing uncertainty of 0.6″ (see e.g. Homan et al. 2016).
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