  Our planet has one permanently bound satellite -the Moon-, a likely large
number of mini-moons or transient irregular natural satellites, and three
temporary natural retrograde satellites or quasi-satellites. These quasi-moons
-(164207) 2004 GU9, (277810) 2006 FV35 and 2013 LX28- are unbound companions to
the Earth. The orbital evolution of quasi-satellites may transform them into
temporarily bound satellites of our planet. Here, we study the dynamical
evolution of the recently discovered Aten asteroid 2014 OL339 to show that it
is currently following a quasi-satellite orbit with respect to the Earth. This
episode started at least about 775 yr ago and it will end 165 yr from now. The
orbit of this object is quite chaotic and together with 164207 are the most
unstable of the known Earth quasi-satellites. This group of minor bodies is,
dynamically speaking, very heterogeneous but three of them exhibit Kozai-like
dynamics: the argument of perihelion of 164207 oscillates around -90 degrees,
the one of 277810 librates around 180 degrees and that of 2013 LX28 remains
around 0 degrees. Asteroid 2014 OL339 is not currently engaged in any
Kozai-like dynamics.
