They're called 3753 Cruithne and 2002 AA29.
Cruithne is 5 km across,
and sometimes called Earth's second moon.
Cruithne is 5 km crosswise over
and at times called Earth's second moon.
Asteroids 3753 Cruithne and 2002 AA29 have complicated orbital relationships with the Earth;
Because of this, Cruithne and Earth appear to"follow" each other in their paths around the Sun.
They're called 3753 Cruithne and 2002 AA29,
which are part of a larger population of asteroids known as Near-Earth Objects(NEOs).
Cruithne orbits the Sun in about 1 year
but it takes 770 years for the series to complete a horseshoe-shaped movement around the Earth.
Cruithne, having a maximum near-Earth magnitude of +15.8,
is fainter than Pluto and would require at least a 320-millimetre(12.5 in) reflecting telescope to be seen.
Although Cruithne's orbit is not thought to be
stable over the long term, calculations by Wiegert and Innanen showed that it has probably been synchronized with Earth's orbit for a long time.