1E 161348-5055.1, commonly shortened to 1E 161348-5055, is a neutron star found in the centre of RCW103 supernova remnant.

Although once considered a central compact object, the observed bursts have caused it to be reclassified as either a magnetar or possibly an x-ray binary.

Its period is too long for a star of 2000 years, which should be rotating thousands of times faster.

This strong field would brake against the debris disk left behind by the supernova, which has thus far been unknown to science.

When the companion is close to the neutron star, it would feed mass into it, creating the increased brightness.