2015 YA

2015 YA is a sub-kilometer asteroid, classified as near-Earth object of the Aten group, that is a temporary horseshoe companion to the Earth.

[6] Prior to a close encounter with the Earth on 15 December 2015, 2015 YA was an Apollo asteroid.

2015 YA was discovered on 16 December 2015 by G. J. Leonard and R. G. Matheny observing for the Catalina Sky Survey.

[2] 2015 YA is currently an Aten asteroid (Earth-crossing but with a period less than a year).

Asteroid 2015 YA follows an asymmetrical horseshoe path with respect to our planet; the value of its relative mean longitude oscillates about 180°, but enclosing 0°.

Animation of 2015 YA's orbit relative to Sun and Earth
2015 YA · Sun · Earth