  We report the discovery of a bright (V=11.6 mag) eclipsing hot subdwarf
binary of spectral type B with a late main sequence companion from the All Sky
Automated Survey (ASAS 102322-3737.0). Such systems are called HW Vir stars
after the prototype. The lightcurve shows a grazing eclipse and a strong
reflection effect. An orbital period of P=0.13927 d, an inclination of
i=65.86{\deg}, a mass ratio q=0.34, a radial velocity semiamplitude K_1=81.0
kms^-1, and other parameters are derived from a combined spectroscopic and
photometric analysis. The short period can only be explained by a common
envelope origin of the system. The atmospheric parameters (T_eff=28400 K, log
g=5.60) are consistent with a core helium-burning star located on the extreme
horizontal branch. In agreement with that we derived the most likely sdB mass
to be M_sdB=0.46M_sun, close to the canonical mass of such objects. The
companion is a late M-dwarf with a mass of M_comp=0.16 M_sun. ASAS
102322-3737.0 is the third brightest of only 12 known HW Virginis systems,
which makes it an ideal target for detailed spectroscopic studies and long term
photometric monitoring to search for period variations, e.g. caused by a
substellar companion.
