A millisecond pulsar position determined to 0.2 mas precision with VLBI

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Volume 691 (November 2024)

A&A, 691 (2024) A47

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Table 2

Enhanced astrometric results of PSR J2222-0137.

µ_α	µ_δ	ϖ	^Ωasc	i	Reference
(mas yr^-1)	(mas yr^–1)	(mas)	(deg)	(deg)	–
44.707(5)	–5.403(12)	${3.723}_{- 0.014}^{+ 0.013}$ $3.723_{ - 0.014}^{ + 0.013}$	190(7) ^(a)	85.28(9) ^(a)	This work
44.70(4)	–5.69(8)	${3.730}_{- 0.016}^{+ 0.015}$ $3.730_{ - 0.016}^{ + 0.015}$	$189_{- 18}^{+ 19}$ $189_{ - 18}^{ + 19}$	85.25(25)	G21

Notes. From left to right, the five parameters refer to the two components of proper motion, parallax, ascending node longitude, and orbital inclination. The reference epoch t_ref is MJD 55899. ^(a)The tighter constraints on the two orbital parameters almost entirely result from using more precise prior values obtained with pulsar timing (G21). Nonetheless, including the inference of Ω_asc and i is expected to improve the accuracy of the astrometric model.

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