I am not sure what the exact definition of azimuth heading angle is but it should be closely related to the ERS orbit inclination which is 98.5 degrees.
edit: …so the heading is 8.5 degrees off true north. This with the correct sign could be the azimuth heading angle I think. If it is related to the ground-track it is a bit more complicated since the rotation of the Earth has to be taken into account.