I've seen this fleet with all kinds of resources sitting a few times in the last few weeks, but he always came on and moved before I could get a colony ship there...So today it was close enough I could launch from an established colony, so I launched and here's the results

The attacker has won the battle !
You receive 10.416.667 units of Metal, 10.416.667 units of Crystal and 10.416.667 units of Deuterium.
The attacker has lost a total of 0 units.
The defender has lost a total of 578.892.000 units.
A debris field containing 181.303.200 units of Metal and 166.032.000 units of Crystal has formed in orbit around the planet.
The probability of creating a moon is : 19 %

Follow ups:

You receive 145.885.965 units of Metal, 183.307.018 units of Crystal and 57.927.710 units of Deuterium.
You receive 72.942.983 units of Metal, 162.609.720 units of Crystal and 28.963.855 units of Deuterium.
You receive 36.471.491 units of Metal, 81.304.860 units of Crystal and 14.481.928 units of Deuterium.
You receive 18.235.746 units of Metal, 40.652.430 units of Crystal and 7.240.964 units of Deuterium.

All DF collected, GLOTR