Do you have a potato cannon? They are used to launch ropes into trees when you can’t throw it that high. Then just pulley the node up and attach the rope somewhere more convenient. Attach some smaller lines to the node to orient it.

It seems as though Planet Y is an alternate theory to Planet X, which are both hypothetical 9th planets. The headline makes it sound like they theorize 10 planets already.

Uranus is the 7th planet, followed by Neptune.

Wikipedia on Planet 9

edit: added Planet 9 article