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Table 3.
Orbital and spin parameters of MAXI J1957+032 derived in this work from a 4D optimization scheme using NICER 0.5–10 keV data for the 2022 outburst and EP 0.5–10 keV data for the 2025 outburst.
| Parameter | Values |
|---|---|
| α2000a |  |
| δ2000a |  |
| e | 0 (fixed) |
| 2025 outburst: EP | |
| Porb (s) | 3652.95(43) |
| ax sin i (lt-s) | 0.013 85(12) |
| Tasc (MJD, TDB) | 60802.746 344(60) |
| Validity range (MJD, TDB) | 60802–60807 |
| t0 (Epoch, MJD, TDB) | 60804 |
| ν (Hz) | 313.643 736 8(7) |
| JPL Ephemeris | DE421 |
| 2022 outburst: NICER | |
| Porb (s) | 3652.94(15) |
| ax sin i (lt-s) | 0.013 80(7) |
| Tasc (MJD, TDB) | 59749.633 151(43) |
| Validity range (MJD, TDB) | 59749–59755 |
| t0 (Epoch, MJD, TDB) | 59752.0 |
| ν (Hz) | 313.643 741 98(24) |
| JPL Ephemeris | DE421 |
Notes. aThe position used in the barycentering process (Chakrabarty et al. 2016).
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