Table 1: Orbital parameters of 4U 1538-52.
Parameter Elliptical orbit Circular orbit
$T_{\pi/2}$ Orbital epoch (MJD) 52855.0421 $\pm$ 0.025 52855.0441 $\pm$ 0.025
ax $\sin$ i (lt-s)a 56.6 $\pm$ 0.7 54.3 $\pm$ 0.6
ea 0.174 $\pm$ 0.015  
$\omega$a(deg) 64 $\pm$ 9  
$P_{\rm orbit}$a 3.7228366 $\pm$ 0.000032 3.7228366 $\pm$ 0.000032
Epoch (MJD) 52855.0585 $\pm$ 0.025 52855.0585 $\pm$ 0.025
$P_{\rm pulse}$ (s) 526.8551 $\pm$ 0.016 526.8535 $\pm$ 0.013
$\dot \nu$ (Hz s-1) $(2.838\pm4.124)\times 10^{-13}$ $(2.241\pm 2.764)\times 10^{-13}$
reduced $ \chi^{2}$ 1.44 1.0

a Taken from Clark (2000).


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