Table 3
Absolute pulsar positions with respect to the barycenter of the Solar System, derived with the PINPT strategy.
| αB | δB | |
|---|---|---|
| tref = MJD 59554.0 — VLBI-only | ||
| psr. appr. (a) | 22h22m06s.00015±0.17 mas | –01°37′15.″7827±0.32 mas |
| J2221 appr. (a) | 22h22m06s.00015±0.19 mas | –01°37′15.″7825 ± 0.42 mas |
| J2222 appr. (a) | 22h22m06s.00015±0.14 mas | –01°37′15.″7828±0.27 mas |
| tref = MJD 55743 — VLBI vs timing | ||
| J2221 appr. (b) | 22h22m 05s969005 ±0.13 mas | –01°37′15.″7263l ±0.24 mas |
| J2222 appr. (b) | 22h22m05s969042±0.13 mas | –01°37′15.″72646±0.21 mas |
| DMX (c) | 22h22m05s969046±0.18 mas | –01°37′15.″7257±0.5 mas |
| non-DMX (c) | 22h22m 05s969071 ± 0.06 mas | –01°37′15.″7267 ±0.1 mas |
Notes. The “psr. appr.”, “J2221 appr.”, and “J2222 appr.” refer to the three approaches (to deriving the absolute pulsar position) described in Sect. 5. (a)Only the pulsar position at MJD 59554.0 obtained with the pulsar approach (shown in bold in the upper block) is free of additional errors due to structure evolution (of the reference sources), and is reported as the primary absolute position of PSR J2222-0137. (b)For the sole purpose of comparison with the timing positions reported in G21, PINPT-based positions are derived for MJD 55743. To minimize the impact of structure evolution (of J2221 and J2222), the J2222- approach-based RA and the J2221-approach-based declination (shown in bold in the lower block) are adopted as the absolute pulsar position at MJD 55743 (see Sect. 6). (c) For readers’ convenience, the latest published timing-based positions inferred without applying any VLBI prior (see Table 3 of G21) are listed here as “DMX” and “non-DMX” (see Sect. 6 for more explanations).
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