Katy is on the right track but a knot isn't,t the way to go. 5/8" is
kind of heavy to be heaving but a pipe wrench or some other handy
weighted object tied to the end will increase distance and accuracy.

I've used a boat fender to send a line across the water way in our
marina. I still used the two separate coils. The fender works well
because it doesn't sink and can be grabbed with a boat hook

Ole Thom