Table 1.
Timing solutions for IGR J17511−3057 during the observed outbursts.
| 2009 | 2015 | 2025 | |
|---|---|---|---|
| Parameters | RXTE | XMM-Newton + NuSTAR | NICER + NuSTAR |
| RA (J2000) | 17h51m08.66s ± 0.6s | ||
| Dec (J2000) | −30° 57′41.0″ ± 0.6″ | ||
| Porb (s) | 12487.5118(4) | 12487.507(1) | 12487.505(2) |
| x (lt-s) | 0.275196(2) | 0.275192(4) | 0.275197(8) |
| TASC (MJD/TDB) | 55088.0320286(6) | 57107.858808(1) | 60717.674090(3) |
| Eccentricity | < 4 × 10−5 (3σ c.l.) | < 9 × 10−5 (3σ c.l.) | < 2 × 10−4 (3σ c.l.) |
| T0 (MJD/TDB) | 55087.8 | 57107.9 | 60717.7 |
| ν0 (Hz) | 244.83395161(3) | 244.83395112(3) | 244.83395034(3) |
| χred2/d.o.f. | 1.48/7005 | 1.51/1541 | 1.19/266 |
Notes. Orbital parameters and spin frequency evolution of IGR J17511−3057 obtained from the analysis of the NICER and NuSTAR observations from its latest outburst. T0 represents the reference epoch for this timing solution. Uncertainties reported on the last digit correspond to the 1σ confidence level. Uncertainties are also scaled by a factor 
. We added a systematic uncertainty of 3 × 10−8 Hz in quadrature to the spin parameters to account for positional uncertainties.
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