Chandra observations 15 years apart yield a 24.7 ± 6.8 mas/yr proper motion for the neutron star in G18.9-1.1, corresponding to transverse velocities of about 264 or 474 km/s depending on distance, directed opposite the ejecta.
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Proper Motion of the Neutron Star in the Supernova Remnant G18.9-1.1
Chandra observations 15 years apart yield a 24.7 ± 6.8 mas/yr proper motion for the neutron star in G18.9-1.1, corresponding to transverse velocities of about 264 or 474 km/s depending on distance, directed opposite the ejecta.