  We report the discovery of a bright, brown dwarf companion to the star HIP
64892, imaged with VLT/SPHERE during the SHINE exoplanet survey. The host is a
B9.5V member of the Lower-Centaurus-Crux subgroup of the Scorpius Centaurus OB
association. The measured angular separation of the companion
($1.2705\pm0.0023$") corresponds to a projected distance of $159\pm12$ AU. We
observed the target with the dual-band imaging and long-slit spectroscopy modes
of the IRDIS imager to obtain its SED and astrometry. In addition, we
reprocessed archival NACO L-band data, from which we also recover the
companion. Its SED is consistent with a young (<30 Myr), low surface gravity
object with a spectral type of M9$_{\gamma}\pm1$. From comparison with the
BT-Settl atmospheric models we estimate an effective temperature of
$T_{\textrm{eff}}=2600 \pm 100$ K, and comparison of the companion photometry
to the COND evolutionary models yields a mass of $\sim29-37$ M$_{\text{J}}$ at
the estimated age of $16^{+15}_{-7}$ Myr for the system. HIP 64892 is a rare
example of an extreme-mass ratio system ($q\sim0.01$) and will be useful for
testing models relating to the formation and evolution of such low-mass
objects.
