Table 4.
Orbital parameters for PSR J2222−0137.
| Orbital model | DDGR | DDK | DDK Bayesian grid |
| Weighted residual rms (μs) | 2.759 | 2.772 | – |
| χ2 | 10629.32 | 10627.89 | – |
| Reduced χ2 | 0.9934 | 0.9934 | – |
| Orbital period, Pb (days) | 2.44576436(2) | 2.44576437(2) | – |
| Projected semi-major axis, x (lt-s) | 10.84802354(10) | 10.8480235(2) | – |
| Epoch of periastron, T0 (MJD) | 58002.019280(10) | 58002.01928(1) | – |
| Orbital eccentricity, e | 0.00038092(1) | 0.00038092(1) | – |
| Longitude of periastron, ω (deg) | 120.458(1) | 120.458(2) | – |
| Total mass, Mtot (M⊙ ) | 3.135(19) | – | 3.150(14) |
| Companion mass, Mc (M⊙ ) | 1.3153(56) | 1.315(12) | 1.3194(40) |
Rate of advance of periastron,  (deg yr−1) |
– | 0.09605(48) | – |
| Derivative of Pb, Ṗb (10−12 s s−1) | 0.2634(74) (a) | 0.2509(76) | – |
| Derivative of x, ẋ (10−15 lt-s s−1) | −7.76(48) | – | – |
| Orbital inclination (deg) | – | 85.284(87) | 85.269(41) |
| Position angle of line of nodes, Ω (deg) | – | 191.3(7.0) | 187.7(5.7) |
| Derived parameters | |||
| Mass function, f (M⊙ ) | 0.229142359(10) | 0.229142358(12) | – |
| Pulsar mass, Mp (M⊙ ) | 1.820(14) | – | 1.831(10) |
Notes. Binary parameters and 1σ uncertainties derived from TEMPO, in Barycentric Dynamical Time (TDB). In both models, we used the DMX dispersion model and the proper motion measured from VLBI. For the DDK model, we used the Einstein delay (γ) calculated by the DDGR model; this is necessary for unbiased estimates of Ω and i (see Sect. 5.5).
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