  We present here new measurements of the longitudinal magnetic field (B_e) in
the binary system HD9996, where the primary companion is an Ap star. Series of
63 B_e observations was obtained in years 1994-2011 with the 1m optical
telescope of the Special Astrophysical Observatory (Russia). New magnetic data
allowed us to refine the long-term magnetic period of HD9996 to P_mag=21.8
years. Compilation of archival photometric data showed the existence of long
term variations of HD9996 in time scale of 22-23 yr consistent with P_mag}. We
identify P_mag with the precession period of the primary Ap star and summarize
search for a short-term rotational period and the rotational line broadening in
this star.
