  Polarimetry of IGR J1401-4306, a long period (12.7 hours), eclipsing
intermediate polar and remnant of Nova Scorpii 1437 A.D., reveals periodic
variations of optical circular polarization, confirming the system as the
longest period eclipsing intermediate polar known. This makes it an interesting
system from an evolutionary perspective. The circular polarization is
interpreted as optical cyclotron emission from an accreting magnetic white
dwarf primary. Based on the polarimetry, we propose that it is a disc-fed
intermediate polar. The detection of predominantly negative circular
polarization is consistent with only one of the magnetic poles dominating the
polarized emission, while the other is mostly obscured by the accretion disc.
