  A geomagnetic storm is mainly caused by a front-side coronal mass ejection
(CME) hitting the Earth and then interacting with the magnetosphere. However,
not all front-side CMEs can hit the Earth. Thus, which CMEs hit the Earth and
when they do so are important issues in the study and forecasting of space
weather. In our previous work (Shen et al., 2013), the de-projected parameters
of the full-halo coronal mass ejections (FHCMEs) that occurred from 2007 March
1 to 2012 May 31 were estimated, and there are 39 front-side events could be
fitted by the GCS model. In this work, we continue to study whether and when
these front-side FHCMEs (FFHCMEs) hit the Earth. It is found that 59\% of these
FFHCMEs hit the Earth, and for central events, whose deviation angles
$\epsilon$, which are the angles between the propagation direction and the
Sun-Earth line, are smaller than 45 degrees, the fraction increases to 75\%.
After checking the deprojected angular widths of the CMEs, we found that all of
the Earth-encountered CMEs satisfy a simple criterion that the angular width
($\omega$) is larger than twice the deviation angle ($\epsilon$). This result
suggests that some simple criteria can be used to forecast whether a CME could
hit the Earth. Furthermore, for Earth-encountered CMEs, the transit time is
found to be roughly anti-correlated with the de-projected velocity, but some
events significantly deviate from the linearity. For CMEs with similar
velocities, the differences of their transit times can be up to several days.
Such deviation is further demonstrated to be mainly caused by the CME geometry
and propagation direction, which are essential in the forecasting of CME
arrival.
