Broadband X-ray spectral and timing properties of the accreting millisecond X-ray pulsar IGR J17498−2921 during the 2023 outburst

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Table 2.

Orbital and spin parameters of IGR J17498−2921 as derived in this work from a 4D optimization scheme using NICER 1.5–10 keV data.

Parameter	Values	Units
α₂₀₀₀	$17^{h} 49^{m} 55 \overset{s}{.} 35$ $17^{{\scriptsize h}} 49^{{\scriptsize m}} 55{{\overset{\text{ s}}{.}}}35$
δ₂₀₀₀	$- 29 ° 19' 19 \overset{″}{.} 6$ $-29{\circ}19{\prime}19{{\overset{\prime\prime}{.}}}6$
e	0 (fixed)
P_orb	13835.6176(72)	s
a_x sin i	0.365 181(24)	lt-s
T_asc	60053.925 446 1(39)	MJD (TDB)

Constant frequency model

Validity range	60054-60067	MJD (TDB)
t₀ (Epoch)	60061	MJD (TDB)
ν	400.990 186 000(25)	Hz
JPL Ephemeris	DE405

Notes. The used position (see Chakrabarty et al. 2011) in the barycentering process is shown as well.

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