Massive runaway star HD 254577: The pre-supernova binary companion to the progenitor of the supernova remnant IC 443

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Table 7.

Parameters from tracing back the runaway star.

Age	Exp. RA	Exp. Dec	v_NS
(kyr)	(deg)	(deg)	(km s⁻¹)
4	94.47196 ± 0.00012	22.40876 ± 0.00029	$1391 . 0_{- 1.6}^{+ 2.7}$ $Mathematical equation: $ 1391.0^{+2.7}_{-1.6} $$
10	94.46499 ± 0.00029	22.40818 ± 0.00073	$537 . 9_{- 0.7}^{+ 1.9}$ $Mathematical equation: $ 537.9^{+1.9}_{-0.7} $$
15	94.45918 ± 0.00044	22.40769 ± 0.00110	$348 . 4_{- 0.5}^{+ 1.7}$ $Mathematical equation: $ 348.4^{+1.7}_{-0.5} $$
20	94.45337 ± 0.00058	22.40721 ± 0.00146	$253 . 6_{- 0.4}^{+ 1.6}$ $Mathematical equation: $ 253.6^{+1.6}_{-0.4} $$
30	94.44176 ± 0.00087	22.40624 ± 0.00219	$158 . 8_{- 0.3}^{+ 1.6}$ $Mathematical equation: $ 158.8^{+1.6}_{-0.3} $$

Notes. The coordinates from the explosion center and the associated NS transverse velocities are given for various SNR-NS ages.

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