  Jupiter has nearly 8000~known co-orbital asteroids orbiting in the L4 and L5
Lagrange points called Jupiter Trojan asteroids. Aside from the greater number
density of the L4 cloud the two clouds are in many ways considered to be
identical. Using sparse photometric data taken by the Asteroid
Terrestrial-impact Last Alert System (ATLAS) for 863 L4 Trojans and 380 L5
Trojans we derive the shape distribution for each of the clouds and find that,
on average, the L4 asteroids are more elongated than the L5 asteroids. This
shape difference is most likely due to the greater collision rate in the L4
cloud that results from its larger population. We additionally present the
phase functions and $c-o$ colours of 266~objects.
