  We show that the estimates of close encounter of this comet with Mars depend
on data treatment. Using the data taken in the two-year period, we derived that
the comet will miss Mars on 2014 October 19 at the distance of about
$140\,150\pm 55$ km or $140\,300\pm 45$ km from its center, depending on the
method of data processing in the purely gravitational model of motion (based on
non-weighted data or weighted data, respectively). Unfortunately, the
non-gravitational model of motion is still very uncertain, thus we can only
speculate about estimates of expected distances for non-gravitational orbital
solutions. However, we did not obtain a significant differences in close
encounter prediction between the non-gravitational solutions and the
gravitational ones.
