Table 1.
Orbital parameters and spin frequency of IGR J17591–2342 with uncertainties on the last digit quoted at 1σ confidence level.
| Parameters | NuSTAR | NICER | NuSTAR + NICER |
|---|---|---|---|
| RAa (J2000) | 17h59m02.86s ± 0.04s | ||
| Deca (J2000) | −23°43′ 08.3″ ± 0.1″ | ||
| Porb (s) | 31684.8 ± 0.1 | 31684.743 ± 0.003 | 31684.738 ± 0.002 |
| x (lt-s) | 1.22774 ± 1 × 10−5 | 1.227716 ± 8 × 10−6 | 1.227728 ± 7 × 10−6 |
| TNOD (MJD) | 58345.171984 ± 4 × 10−6 | 58345.1719787 ± 16 × 10−7 | 58345.1719786 ± 14 × 10−7 |
| e | <1 × 10−4 | <6 × 10−5 | <5.5 × 10−5 |
| ν0 (Hz) | 527.425790 ± 1 × 10−6 | 527.42570042 ± 8 × 10−8 | – |
 |
b(2.6 ± 0.3) × 10−10 | (2.0 ± 1.6) × 10−13 | – |
| T0 (MJD) | 58344.0 | 58344.0 | 58344.0 |
 /d.o.f. |
2.27/65 | 1.25/99 | 1.67/177 |
Notes.
Localisation of the ATCA radio counterpart (Russell et al. 2018).
The spin frequency derivative likely originates from the time drift of the internal clock of the NuSTAR instrument, see Sect. 4 for more details. T0 represents the reference epoch for these timing solutions. Frequencies and times reported here are given in the TDB timescale.
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