  We discuss properties of the ultra-luminous $X$-ray source in the galaxy M82,
NuSTAR J095551+6940.8, containing an accreting neutron star. The neutron star
has surface magnetic field $ B_{NS} \approx 1.4 \times 10^{13 } \, {\rm G}$ and
experiences accretion rate of $9 \times 10^{-7} M_\odot {\rm \, yr}^{-1} $. The
magnetospheric radius, close to the corotation radius, is $\sim 2 \times 10^8$
cm. The accretion torque on the neutron star is reduce well below what is
expected in a simple magnetospheric accretion due to effective penetration of
the stellar magnetic field into the disk beyond the corotation radius. As a
result, the radiative force of the surface emission does not lead to strong
coronal wind, but pushes plasma along magnetic field lines towards the
equatorial disk. The neutron star is nearly an orthogonal rotator, with the
angle between the rotation axis and the magnetic moment $\geq 80$ degrees.
Accretion occurs through optically thick -- geometrically thin and flat
accretion "curtain", which cuts across the polar cap. High radiation pressure
from the neutron star surface is nevertheless smaller than that the ram
pressure of the accreting material flowing through the curtain, and thus fails
to stop the accretion. At distances below few stellar radii the magnetic
suppression of the scattering cross-section becomes important. The $X$-ray
luminosity (pulsed and persistent components) comes both from the neutron star
surface as a hard $X$-ray component and as a soft component from reprocessing
by the accretion disk.
