Table 1.
Barycentric astrometric parameters derived from our re-analysis of the VLBI data on PSR J2222−0137, compared to the orbital-motion-corrected parameters estimated by Deller et al. (2013) and the difference between the former and the latter.
| Measured parameters | This work | Deller et al. (2013) | Difference | Significance (sigma) |
| Epoch (MJD) | 55743 | 55743 | – | – |
| Right Ascension, α′ (J2000) | 22h:22m: |
22h:22m: |
 |
−1.8 |
| Declination, δ′ (J2000) | −01 deg:37′: |
−01 deg:37′: |
 |
−0.5 |
| Absolute Right Ascension, α (J2000) | 22h:22m: |
− | − | − |
| Absolute Declination, δ (J2000) | −01 deg:37′: |
− | − | − |
| Proper motion in α, μα (mas yr−1) | 44.70(4) | 44.73(2) | −0.033(38) | −0.9 |
| Proper motion in δ, μδ (mas yr−1) | −5.69(8) | −5.68(6) | −0.008(80) | −0.1 |
| Parallax, ϖ (mas) |
 |
 |
−0.012(16) | −0.7 |
| PA of the ascending node, Ω (deg) |
 |
 |
184(19) | ∼10 |
| Orbital inclinations sampled, i (deg) | 85.25 ± 0.25, 94.75 ± 0.25 | 86.9, 93.1 | – | – |
| Derived parameters | ||||
| Galactic longitude, l (deg) | 62.0185 | |||
| Galactic latitude, b (deg) | −46.0753 | |||
| Ecliptic longitude, λ (deg) | 336.7319 | |||
| Ecliptic latitude, β (deg) | 7.9771 | |||
| Distance, d (pc) |
 |
 |
+0.7(1.2) | +0.7 |
| Total proper motion, μ (mas yr−1) | 45.057(38) | 45.09(2) | −0.033(38) | −0.9 |
| PA of proper motion, Θμ (deg, J2000) | 97.25(10) | 97.24(8) | 0.01(10) | +0.1 |
| Transverse velocity, vT (km s−1) | 57.26(25) |
 |
0.16(25) | +0.6 |
Notes. PA stands for ‘position angle’. The errors on the difference are those of our uncertainty estimate. The estimates of α′ and δ′ do not take into account the newly derived position for the in-beam calibrator (J2222−0132) or its related uncertainties; these are taken into account in the estimate of the absolute VLBI position, α and δ (see Sect. 2.3).
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